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kernel/exit.c
45.9 KB
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/* * linux/kernel/exit.c * * Copyright (C) 1991, 1992 Linus Torvalds */ |
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#include <linux/mm.h> #include <linux/slab.h> #include <linux/interrupt.h> |
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#include <linux/module.h> |
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#include <linux/capability.h> |
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#include <linux/completion.h> #include <linux/personality.h> #include <linux/tty.h> |
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#include <linux/mnt_namespace.h> |
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#include <linux/iocontext.h> |
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#include <linux/key.h> #include <linux/security.h> #include <linux/cpu.h> #include <linux/acct.h> |
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#include <linux/tsacct_kern.h> |
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#include <linux/file.h> |
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#include <linux/fdtable.h> |
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#include <linux/binfmts.h> |
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#include <linux/nsproxy.h> |
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#include <linux/pid_namespace.h> |
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#include <linux/ptrace.h> #include <linux/profile.h> #include <linux/mount.h> #include <linux/proc_fs.h> |
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#include <linux/kthread.h> |
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#include <linux/mempolicy.h> |
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#include <linux/taskstats_kern.h> |
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#include <linux/delayacct.h> |
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#include <linux/freezer.h> |
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#include <linux/cgroup.h> |
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#include <linux/syscalls.h> |
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#include <linux/signal.h> |
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#include <linux/posix-timers.h> |
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#include <linux/cn_proc.h> |
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#include <linux/mutex.h> |
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#include <linux/futex.h> |
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#include <linux/pipe_fs_i.h> |
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#include <linux/audit.h> /* for audit_free() */ |
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#include <linux/resource.h> |
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#include <linux/blkdev.h> |
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#include <linux/task_io_accounting_ops.h> |
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#include <linux/tracehook.h> |
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#include <linux/init_task.h> |
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#include <trace/sched.h> |
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#include <asm/uaccess.h> #include <asm/unistd.h> #include <asm/pgtable.h> #include <asm/mmu_context.h> |
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#include "cred-internals.h" |
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|
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DEFINE_TRACE(sched_process_free); DEFINE_TRACE(sched_process_exit); DEFINE_TRACE(sched_process_wait); |
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static void exit_mm(struct task_struct * tsk); |
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static inline int task_detached(struct task_struct *p) { return p->exit_signal == -1; } |
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static void __unhash_process(struct task_struct *p) { nr_threads--; detach_pid(p, PIDTYPE_PID); |
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if (thread_group_leader(p)) { detach_pid(p, PIDTYPE_PGID); detach_pid(p, PIDTYPE_SID); |
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|
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list_del_rcu(&p->tasks); |
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__get_cpu_var(process_counts)--; |
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} |
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list_del_rcu(&p->thread_group); |
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list_del_init(&p->sibling); |
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} |
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/* * This function expects the tasklist_lock write-locked. */ static void __exit_signal(struct task_struct *tsk) { struct signal_struct *sig = tsk->signal; struct sighand_struct *sighand; BUG_ON(!sig); BUG_ON(!atomic_read(&sig->count)); |
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sighand = rcu_dereference(tsk->sighand); spin_lock(&sighand->siglock); posix_cpu_timers_exit(tsk); if (atomic_dec_and_test(&sig->count)) posix_cpu_timers_exit_group(tsk); else { /* * If there is any task waiting for the group exit * then notify it: */ |
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if (sig->group_exit_task && atomic_read(&sig->count) == sig->notify_count) |
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wake_up_process(sig->group_exit_task); |
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|
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if (tsk == sig->curr_target) sig->curr_target = next_thread(tsk); /* * Accumulate here the counters for all threads but the * group leader as they die, so they can be added into * the process-wide totals when those are taken. * The group leader stays around as a zombie as long * as there are other threads. When it gets reaped, * the exit.c code will add its counts into these totals. * We won't ever get here for the group leader, since it * will have been the last reference on the signal_struct. */ |
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sig->gtime = cputime_add(sig->gtime, task_gtime(tsk)); |
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sig->min_flt += tsk->min_flt; sig->maj_flt += tsk->maj_flt; sig->nvcsw += tsk->nvcsw; sig->nivcsw += tsk->nivcsw; |
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sig->inblock += task_io_get_inblock(tsk); sig->oublock += task_io_get_oublock(tsk); |
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task_io_accounting_add(&sig->ioac, &tsk->ioac); |
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sig = NULL; /* Marker for below. */ } |
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__unhash_process(tsk); |
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/* * Do this under ->siglock, we can race with another thread * doing sigqueue_free() if we have SIGQUEUE_PREALLOC signals. */ flush_sigqueue(&tsk->pending); |
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tsk->signal = NULL; |
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tsk->sighand = NULL; |
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spin_unlock(&sighand->siglock); |
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|
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__cleanup_sighand(sighand); |
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clear_tsk_thread_flag(tsk,TIF_SIGPENDING); |
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if (sig) { flush_sigqueue(&sig->shared_pending); |
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taskstats_tgid_free(sig); |
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/* * Make sure ->signal can't go away under rq->lock, * see account_group_exec_runtime(). */ task_rq_unlock_wait(tsk); |
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__cleanup_signal(sig); } } |
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static void delayed_put_task_struct(struct rcu_head *rhp) { |
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struct task_struct *tsk = container_of(rhp, struct task_struct, rcu); trace_sched_process_free(tsk); put_task_struct(tsk); |
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} |
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|
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void release_task(struct task_struct * p) { |
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struct task_struct *leader; |
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int zap_leader; |
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repeat: |
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tracehook_prepare_release_task(p); |
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/* don't need to get the RCU readlock here - the process is dead and * can't be modifying its own credentials */ atomic_dec(&__task_cred(p)->user->processes); |
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proc_flush_task(p); |
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write_lock_irq(&tasklist_lock); |
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tracehook_finish_release_task(p); |
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__exit_signal(p); |
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|
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/* * If we are the last non-leader member of the thread * group, and the leader is zombie, then notify the * group leader's parent process. (if it wants notification.) */ zap_leader = 0; leader = p->group_leader; if (leader != p && thread_group_empty(leader) && leader->exit_state == EXIT_ZOMBIE) { |
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BUG_ON(task_detached(leader)); |
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do_notify_parent(leader, leader->exit_signal); /* * If we were the last child thread and the leader has * exited already, and the leader's parent ignores SIGCHLD, * then we are the one who should release the leader. * * do_notify_parent() will have marked it self-reaping in * that case. */ |
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zap_leader = task_detached(leader); |
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/* * This maintains the invariant that release_task() * only runs on a task in EXIT_DEAD, just for sanity. */ if (zap_leader) leader->exit_state = EXIT_DEAD; |
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} |
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write_unlock_irq(&tasklist_lock); |
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release_thread(p); |
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call_rcu(&p->rcu, delayed_put_task_struct); |
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p = leader; if (unlikely(zap_leader)) goto repeat; } |
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/* * This checks not only the pgrp, but falls back on the pid if no * satisfactory pgrp is found. I dunno - gdb doesn't work correctly * without this... |
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* * The caller must hold rcu lock or the tasklist lock. |
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*/ |
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struct pid *session_of_pgrp(struct pid *pgrp) |
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{ struct task_struct *p; |
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struct pid *sid = NULL; |
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|
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p = pid_task(pgrp, PIDTYPE_PGID); |
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if (p == NULL) |
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p = pid_task(pgrp, PIDTYPE_PID); |
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if (p != NULL) |
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sid = task_session(p); |
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|
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return sid; } /* * Determine if a process group is "orphaned", according to the POSIX * definition in 2.2.2.52. Orphaned process groups are not to be affected * by terminal-generated stop signals. Newly orphaned process groups are * to receive a SIGHUP and a SIGCONT. * * "I ask you, have you ever known what it is to be an orphan?" */ |
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static int will_become_orphaned_pgrp(struct pid *pgrp, struct task_struct *ignored_task) |
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{ struct task_struct *p; |
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|
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do_each_pid_task(pgrp, PIDTYPE_PGID, p) { |
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if ((p == ignored_task) || (p->exit_state && thread_group_empty(p)) || is_global_init(p->real_parent)) |
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continue; |
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|
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if (task_pgrp(p->real_parent) != pgrp && |
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task_session(p->real_parent) == task_session(p)) return 0; |
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} while_each_pid_task(pgrp, PIDTYPE_PGID, p); |
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return 1; |
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} |
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int is_current_pgrp_orphaned(void) |
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{ int retval; read_lock(&tasklist_lock); |
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retval = will_become_orphaned_pgrp(task_pgrp(current), NULL); |
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read_unlock(&tasklist_lock); return retval; } |
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static int has_stopped_jobs(struct pid *pgrp) |
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{ int retval = 0; struct task_struct *p; |
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do_each_pid_task(pgrp, PIDTYPE_PGID, p) { |
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if (!task_is_stopped(p)) |
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continue; |
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retval = 1; break; |
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} while_each_pid_task(pgrp, PIDTYPE_PGID, p); |
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return retval; } |
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/* * Check to see if any process groups have become orphaned as * a result of our exiting, and if they have any stopped jobs, * send them a SIGHUP and then a SIGCONT. (POSIX 3.2.2.2) */ static void kill_orphaned_pgrp(struct task_struct *tsk, struct task_struct *parent) { struct pid *pgrp = task_pgrp(tsk); struct task_struct *ignored_task = tsk; if (!parent) /* exit: our father is in a different pgrp than * we are and we were the only connection outside. */ parent = tsk->real_parent; else /* reparent: our child is in a different pgrp than * we are, and it was the only connection outside. */ ignored_task = NULL; if (task_pgrp(parent) != pgrp && task_session(parent) == task_session(tsk) && will_become_orphaned_pgrp(pgrp, ignored_task) && has_stopped_jobs(pgrp)) { __kill_pgrp_info(SIGHUP, SEND_SIG_PRIV, pgrp); __kill_pgrp_info(SIGCONT, SEND_SIG_PRIV, pgrp); } } |
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/** |
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* reparent_to_kthreadd - Reparent the calling kernel thread to kthreadd |
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* * If a kernel thread is launched as a result of a system call, or if |
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* it ever exits, it should generally reparent itself to kthreadd so it * isn't in the way of other processes and is correctly cleaned up on exit. |
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* * The various task state such as scheduling policy and priority may have * been inherited from a user process, so we reset them to sane values here. * |
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* NOTE that reparent_to_kthreadd() gives the caller full capabilities. |
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*/ |
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static void reparent_to_kthreadd(void) |
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{ write_lock_irq(&tasklist_lock); ptrace_unlink(current); /* Reparent to init */ |
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current->real_parent = current->parent = kthreadd_task; |
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list_move_tail(¤t->sibling, ¤t->real_parent->children); |
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/* Set the exit signal to SIGCHLD so we signal init on exit */ current->exit_signal = SIGCHLD; |
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if (task_nice(current) < 0) |
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set_user_nice(current, 0); /* cpus_allowed? */ /* rt_priority? */ /* signals? */ |
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memcpy(current->signal->rlim, init_task.signal->rlim, sizeof(current->signal->rlim)); |
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atomic_inc(&init_cred.usage); commit_creds(&init_cred); |
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write_unlock_irq(&tasklist_lock); |
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} |
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void __set_special_pids(struct pid *pid) |
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{ |
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struct task_struct *curr = current->group_leader; |
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pid_t nr = pid_nr(pid); |
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|
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if (task_session(curr) != pid) { |
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change_pid(curr, PIDTYPE_SID, pid); |
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set_task_session(curr, nr); |
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} |
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if (task_pgrp(curr) != pid) { |
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change_pid(curr, PIDTYPE_PGID, pid); |
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set_task_pgrp(curr, nr); |
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} } |
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static void set_special_pids(struct pid *pid) |
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{ write_lock_irq(&tasklist_lock); |
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__set_special_pids(pid); |
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write_unlock_irq(&tasklist_lock); } /* * Let kernel threads use this to say that they * allow a certain signal (since daemonize() will * have disabled all of them by default). */ int allow_signal(int sig) { |
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if (!valid_signal(sig) || sig < 1) |
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return -EINVAL; spin_lock_irq(¤t->sighand->siglock); sigdelset(¤t->blocked, sig); if (!current->mm) { /* Kernel threads handle their own signals. Let the signal code know it'll be handled, so that they don't get converted to SIGKILL or just silently dropped */ current->sighand->action[(sig)-1].sa.sa_handler = (void __user *)2; } recalc_sigpending(); spin_unlock_irq(¤t->sighand->siglock); return 0; } EXPORT_SYMBOL(allow_signal); int disallow_signal(int sig) { |
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if (!valid_signal(sig) || sig < 1) |
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return -EINVAL; spin_lock_irq(¤t->sighand->siglock); |
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current->sighand->action[(sig)-1].sa.sa_handler = SIG_IGN; |
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recalc_sigpending(); spin_unlock_irq(¤t->sighand->siglock); return 0; } EXPORT_SYMBOL(disallow_signal); /* * Put all the gunge required to become a kernel thread without * attached user resources in one place where it belongs. */ void daemonize(const char *name, ...) { va_list args; struct fs_struct *fs; sigset_t blocked; va_start(args, name); vsnprintf(current->comm, sizeof(current->comm), name, args); va_end(args); /* * If we were started as result of loading a module, close all of the * user space pages. We don't need them, and if we didn't close them * they would be locked into memory. */ exit_mm(current); |
831441862 Freezer: make ker... |
420 421 422 423 |
/* * We don't want to have TIF_FREEZE set if the system-wide hibernation * or suspend transition begins right now. */ |
7b34e4283 introduce PF_KTHR... |
424 |
current->flags |= (PF_NOFREEZE | PF_KTHREAD); |
1da177e4c Linux-2.6.12-rc2 |
425 |
|
8520d7c7f teach set_special... |
426 427 428 429 |
if (current->nsproxy != &init_nsproxy) { get_nsproxy(&init_nsproxy); switch_task_namespaces(current, &init_nsproxy); } |
297bd42b1 move daemonized k... |
430 |
set_special_pids(&init_struct_pid); |
24ec839c4 [PATCH] tty: ->si... |
431 |
proc_clear_tty(current); |
1da177e4c Linux-2.6.12-rc2 |
432 433 434 435 436 437 438 439 440 441 442 443 |
/* Block and flush all signals */ sigfillset(&blocked); sigprocmask(SIG_BLOCK, &blocked, NULL); flush_signals(current); /* Become as one with the init task */ exit_fs(current); /* current->fs->count--; */ fs = init_task.fs; current->fs = fs; atomic_inc(&fs->count); |
ab516013a [PATCH] namespace... |
444 |
|
d4c5e41f3 whitespace fixes:... |
445 |
exit_files(current); |
1da177e4c Linux-2.6.12-rc2 |
446 447 |
current->files = init_task.files; atomic_inc(¤t->files->count); |
49d769d52 Change reparent_t... |
448 |
reparent_to_kthreadd(); |
1da177e4c Linux-2.6.12-rc2 |
449 450 451 |
} EXPORT_SYMBOL(daemonize); |
858119e15 [PATCH] Unlinline... |
452 |
static void close_files(struct files_struct * files) |
1da177e4c Linux-2.6.12-rc2 |
453 454 |
{ int i, j; |
badf16621 [PATCH] files: br... |
455 |
struct fdtable *fdt; |
1da177e4c Linux-2.6.12-rc2 |
456 457 |
j = 0; |
4fb3a5386 [PATCH] files: fi... |
458 459 460 461 462 463 |
/* * It is safe to dereference the fd table without RCU or * ->file_lock because this is the last reference to the * files structure. */ |
badf16621 [PATCH] files: br... |
464 |
fdt = files_fdtable(files); |
1da177e4c Linux-2.6.12-rc2 |
465 466 467 |
for (;;) { unsigned long set; i = j * __NFDBITS; |
bbea9f696 [PATCH] fdtable: ... |
468 |
if (i >= fdt->max_fds) |
1da177e4c Linux-2.6.12-rc2 |
469 |
break; |
badf16621 [PATCH] files: br... |
470 |
set = fdt->open_fds->fds_bits[j++]; |
1da177e4c Linux-2.6.12-rc2 |
471 472 |
while (set) { if (set & 1) { |
badf16621 [PATCH] files: br... |
473 |
struct file * file = xchg(&fdt->fd[i], NULL); |
944be0b22 [PATCH] close_fil... |
474 |
if (file) { |
1da177e4c Linux-2.6.12-rc2 |
475 |
filp_close(file, files); |
944be0b22 [PATCH] close_fil... |
476 477 |
cond_resched(); } |
1da177e4c Linux-2.6.12-rc2 |
478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 |
} i++; set >>= 1; } } } struct files_struct *get_files_struct(struct task_struct *task) { struct files_struct *files; task_lock(task); files = task->files; if (files) atomic_inc(&files->count); task_unlock(task); return files; } |
7ad5b3a50 kernel: remove fa... |
497 |
void put_files_struct(struct files_struct *files) |
1da177e4c Linux-2.6.12-rc2 |
498 |
{ |
badf16621 [PATCH] files: br... |
499 |
struct fdtable *fdt; |
1da177e4c Linux-2.6.12-rc2 |
500 501 502 503 |
if (atomic_dec_and_test(&files->count)) { close_files(files); /* * Free the fd and fdset arrays if we expanded them. |
ab2af1f50 [PATCH] files: fi... |
504 505 506 |
* If the fdtable was embedded, pass files for freeing * at the end of the RCU grace period. Otherwise, * you can free files immediately. |
1da177e4c Linux-2.6.12-rc2 |
507 |
*/ |
badf16621 [PATCH] files: br... |
508 |
fdt = files_fdtable(files); |
4fd45812c [PATCH] fdtable: ... |
509 |
if (fdt != &files->fdtab) |
ab2af1f50 [PATCH] files: fi... |
510 |
kmem_cache_free(files_cachep, files); |
01b2d93ca [PATCH] fdtable: ... |
511 |
free_fdtable(fdt); |
1da177e4c Linux-2.6.12-rc2 |
512 513 |
} } |
3b1253880 [PATCH] sanitize ... |
514 |
void reset_files_struct(struct files_struct *files) |
3b9b8ab65 [PATCH] Fix unser... |
515 |
{ |
3b1253880 [PATCH] sanitize ... |
516 |
struct task_struct *tsk = current; |
3b9b8ab65 [PATCH] Fix unser... |
517 518 519 520 521 522 523 524 |
struct files_struct *old; old = tsk->files; task_lock(tsk); tsk->files = files; task_unlock(tsk); put_files_struct(old); } |
3b9b8ab65 [PATCH] Fix unser... |
525 |
|
1ec7f1ddb [PATCH] get rid o... |
526 |
void exit_files(struct task_struct *tsk) |
1da177e4c Linux-2.6.12-rc2 |
527 528 529 530 531 532 533 534 535 536 |
{ struct files_struct * files = tsk->files; if (files) { task_lock(tsk); tsk->files = NULL; task_unlock(tsk); put_files_struct(files); } } |
1ec7f1ddb [PATCH] get rid o... |
537 |
void put_fs_struct(struct fs_struct *fs) |
1da177e4c Linux-2.6.12-rc2 |
538 539 540 |
{ /* No need to hold fs->lock if we are killing it */ if (atomic_dec_and_test(&fs->count)) { |
6ac08c39a Use struct path i... |
541 542 |
path_put(&fs->root); path_put(&fs->pwd); |
1da177e4c Linux-2.6.12-rc2 |
543 544 545 |
kmem_cache_free(fs_cachep, fs); } } |
1ec7f1ddb [PATCH] get rid o... |
546 |
void exit_fs(struct task_struct *tsk) |
1da177e4c Linux-2.6.12-rc2 |
547 548 549 550 551 552 553 |
{ struct fs_struct * fs = tsk->fs; if (fs) { task_lock(tsk); tsk->fs = NULL; task_unlock(tsk); |
1ec7f1ddb [PATCH] get rid o... |
554 |
put_fs_struct(fs); |
1da177e4c Linux-2.6.12-rc2 |
555 556 |
} } |
1da177e4c Linux-2.6.12-rc2 |
557 |
EXPORT_SYMBOL_GPL(exit_fs); |
cf475ad28 cgroups: add an o... |
558 559 560 561 562 563 564 565 566 567 568 |
#ifdef CONFIG_MM_OWNER /* * Task p is exiting and it owned mm, lets find a new owner for it */ static inline int mm_need_new_owner(struct mm_struct *mm, struct task_struct *p) { /* * If there are other users of the mm and the owner (us) is exiting * we need to find a new owner to take on the responsibility. */ |
cf475ad28 cgroups: add an o... |
569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 |
if (atomic_read(&mm->mm_users) <= 1) return 0; if (mm->owner != p) return 0; return 1; } void mm_update_next_owner(struct mm_struct *mm) { struct task_struct *c, *g, *p = current; retry: if (!mm_need_new_owner(mm, p)) return; read_lock(&tasklist_lock); /* * Search in the children */ list_for_each_entry(c, &p->children, sibling) { if (c->mm == mm) goto assign_new_owner; } /* * Search in the siblings */ list_for_each_entry(c, &p->parent->children, sibling) { if (c->mm == mm) goto assign_new_owner; } /* * Search through everything else. We should not get * here often */ do_each_thread(g, c) { if (c->mm == mm) goto assign_new_owner; } while_each_thread(g, c); read_unlock(&tasklist_lock); |
31a78f23b mm owner: fix rac... |
611 612 613 614 615 616 617 618 619 620 |
/* * We found no owner yet mm_users > 1: this implies that we are * most likely racing with swapoff (try_to_unuse()) or /proc or * ptrace or page migration (get_task_mm()). Mark owner as NULL, * so that subsystems can understand the callback and take action. */ down_write(&mm->mmap_sem); cgroup_mm_owner_callbacks(mm->owner, NULL); mm->owner = NULL; up_write(&mm->mmap_sem); |
cf475ad28 cgroups: add an o... |
621 622 623 624 625 |
return; assign_new_owner: BUG_ON(c == p); get_task_struct(c); |
9363b9f23 memrlimit: cgroup... |
626 627 |
read_unlock(&tasklist_lock); down_write(&mm->mmap_sem); |
cf475ad28 cgroups: add an o... |
628 629 630 631 632 |
/* * The task_lock protects c->mm from changing. * We always want mm->owner->mm == mm */ task_lock(c); |
cf475ad28 cgroups: add an o... |
633 634 |
if (c->mm != mm) { task_unlock(c); |
9363b9f23 memrlimit: cgroup... |
635 |
up_write(&mm->mmap_sem); |
cf475ad28 cgroups: add an o... |
636 637 638 639 640 641 |
put_task_struct(c); goto retry; } cgroup_mm_owner_callbacks(mm->owner, c); mm->owner = c; task_unlock(c); |
9363b9f23 memrlimit: cgroup... |
642 |
up_write(&mm->mmap_sem); |
cf475ad28 cgroups: add an o... |
643 644 645 |
put_task_struct(c); } #endif /* CONFIG_MM_OWNER */ |
1da177e4c Linux-2.6.12-rc2 |
646 647 648 649 |
/* * Turn us into a lazy TLB process if we * aren't already.. */ |
408b664a7 [PATCH] make lots... |
650 |
static void exit_mm(struct task_struct * tsk) |
1da177e4c Linux-2.6.12-rc2 |
651 652 |
{ struct mm_struct *mm = tsk->mm; |
b564daf80 coredump: constru... |
653 |
struct core_state *core_state; |
1da177e4c Linux-2.6.12-rc2 |
654 655 656 657 658 659 |
mm_release(tsk, mm); if (!mm) return; /* * Serialize with any possible pending coredump. |
999d9fc16 coredump: move mm... |
660 |
* We must hold mmap_sem around checking core_state |
1da177e4c Linux-2.6.12-rc2 |
661 |
* and clearing tsk->mm. The core-inducing thread |
999d9fc16 coredump: move mm... |
662 |
* will increment ->nr_threads for each thread in the |
1da177e4c Linux-2.6.12-rc2 |
663 664 665 |
* group with ->mm != NULL. */ down_read(&mm->mmap_sem); |
b564daf80 coredump: constru... |
666 667 668 |
core_state = mm->core_state; if (core_state) { struct core_thread self; |
1da177e4c Linux-2.6.12-rc2 |
669 |
up_read(&mm->mmap_sem); |
c5f1cc8c1 coredump: turn co... |
670 |
|
b564daf80 coredump: constru... |
671 672 673 674 675 676 677 678 |
self.task = tsk; self.next = xchg(&core_state->dumper.next, &self); /* * Implies mb(), the result of xchg() must be visible * to core_state->dumper. */ if (atomic_dec_and_test(&core_state->nr_threads)) complete(&core_state->startup); |
1da177e4c Linux-2.6.12-rc2 |
679 |
|
a94e2d408 coredump: kill mm... |
680 681 682 683 684 685 686 |
for (;;) { set_task_state(tsk, TASK_UNINTERRUPTIBLE); if (!self.task) /* see coredump_finish() */ break; schedule(); } __set_task_state(tsk, TASK_RUNNING); |
1da177e4c Linux-2.6.12-rc2 |
687 688 689 |
down_read(&mm->mmap_sem); } atomic_inc(&mm->mm_count); |
125e18745 [PATCH] More BUG_... |
690 |
BUG_ON(mm != tsk->active_mm); |
1da177e4c Linux-2.6.12-rc2 |
691 692 693 694 695 |
/* more a memory barrier than a real lock */ task_lock(tsk); tsk->mm = NULL; up_read(&mm->mmap_sem); enter_lazy_tlb(mm, current); |
0c1eecfb3 Freezer: avoid fr... |
696 697 |
/* We don't want this task to be frozen prematurely */ clear_freeze_flag(tsk); |
1da177e4c Linux-2.6.12-rc2 |
698 |
task_unlock(tsk); |
cf475ad28 cgroups: add an o... |
699 |
mm_update_next_owner(mm); |
1da177e4c Linux-2.6.12-rc2 |
700 701 |
mmput(mm); } |
f470021ad ptrace children r... |
702 |
/* |
666f164f4 fix dangling zomb... |
703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 |
* Return nonzero if @parent's children should reap themselves. * * Called with write_lock_irq(&tasklist_lock) held. */ static int ignoring_children(struct task_struct *parent) { int ret; struct sighand_struct *psig = parent->sighand; unsigned long flags; spin_lock_irqsave(&psig->siglock, flags); ret = (psig->action[SIGCHLD-1].sa.sa_handler == SIG_IGN || (psig->action[SIGCHLD-1].sa.sa_flags & SA_NOCLDWAIT)); spin_unlock_irqrestore(&psig->siglock, flags); return ret; } /* |
f470021ad ptrace children r... |
720 721 722 723 724 725 |
* Detach all tasks we were using ptrace on. * Any that need to be release_task'd are put on the @dead list. * * Called with write_lock(&tasklist_lock) held. */ static void ptrace_exit(struct task_struct *parent, struct list_head *dead) |
1da177e4c Linux-2.6.12-rc2 |
726 |
{ |
f470021ad ptrace children r... |
727 |
struct task_struct *p, *n; |
666f164f4 fix dangling zomb... |
728 |
int ign = -1; |
241ceee0b [PATCH] restore -... |
729 |
|
f470021ad ptrace children r... |
730 731 732 733 734 735 736 737 738 739 740 741 742 743 |
list_for_each_entry_safe(p, n, &parent->ptraced, ptrace_entry) { __ptrace_unlink(p); if (p->exit_state != EXIT_ZOMBIE) continue; /* * If it's a zombie, our attachedness prevented normal * parent notification or self-reaping. Do notification * now if it would have happened earlier. If it should * reap itself, add it to the @dead list. We can't call * release_task() here because we already hold tasklist_lock. * * If it's our own child, there is no notification to do. |
666f164f4 fix dangling zomb... |
744 745 |
* But if our normal children self-reap, then this child * was prevented by ptrace and we must reap it now. |
1da177e4c Linux-2.6.12-rc2 |
746 |
*/ |
f470021ad ptrace children r... |
747 748 749 |
if (!task_detached(p) && thread_group_empty(p)) { if (!same_thread_group(p->real_parent, parent)) do_notify_parent(p, p->exit_signal); |
666f164f4 fix dangling zomb... |
750 751 752 753 754 755 |
else { if (ign < 0) ign = ignoring_children(parent); if (ign) p->exit_signal = -1; } |
f470021ad ptrace children r... |
756 |
} |
1da177e4c Linux-2.6.12-rc2 |
757 |
|
f470021ad ptrace children r... |
758 |
if (task_detached(p)) { |
1da177e4c Linux-2.6.12-rc2 |
759 |
/* |
f470021ad ptrace children r... |
760 |
* Mark it as in the process of being reaped. |
1da177e4c Linux-2.6.12-rc2 |
761 |
*/ |
f470021ad ptrace children r... |
762 763 |
p->exit_state = EXIT_DEAD; list_add(&p->ptrace_entry, dead); |
1da177e4c Linux-2.6.12-rc2 |
764 765 |
} } |
f470021ad ptrace children r... |
766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 |
} /* * Finish up exit-time ptrace cleanup. * * Called without locks. */ static void ptrace_exit_finish(struct task_struct *parent, struct list_head *dead) { struct task_struct *p, *n; BUG_ON(!list_empty(&parent->ptraced)); list_for_each_entry_safe(p, n, dead, ptrace_entry) { list_del_init(&p->ptrace_entry); release_task(p); } } static void reparent_thread(struct task_struct *p, struct task_struct *father) { if (p->pdeath_signal) /* We already hold the tasklist_lock here. */ group_send_sig_info(p->pdeath_signal, SEND_SIG_NOINFO, p); list_move_tail(&p->sibling, &p->real_parent->children); |
1da177e4c Linux-2.6.12-rc2 |
793 |
|
b2b2cbc4b [PATCH] Fix repar... |
794 795 796 |
/* If this is a threaded reparent there is no need to * notify anyone anything has happened. */ |
376e1d253 reparent_thread: ... |
797 |
if (same_thread_group(p->real_parent, father)) |
b2b2cbc4b [PATCH] Fix repar... |
798 799 800 |
return; /* We don't want people slaying init. */ |
d839fd4d2 ptrace: introduce... |
801 |
if (!task_detached(p)) |
b2b2cbc4b [PATCH] Fix repar... |
802 |
p->exit_signal = SIGCHLD; |
b2b2cbc4b [PATCH] Fix repar... |
803 804 805 806 |
/* If we'd notified the old parent about this child's death, * also notify the new parent. */ |
f470021ad ptrace children r... |
807 808 |
if (!ptrace_reparented(p) && p->exit_state == EXIT_ZOMBIE && |
d839fd4d2 ptrace: introduce... |
809 |
!task_detached(p) && thread_group_empty(p)) |
b2b2cbc4b [PATCH] Fix repar... |
810 |
do_notify_parent(p, p->exit_signal); |
f49ee505b introduce kill_or... |
811 |
kill_orphaned_pgrp(p, father); |
1da177e4c Linux-2.6.12-rc2 |
812 813 814 815 816 817 |
} /* * When we die, we re-parent all our children. * Try to give them to another thread in our thread * group, and if no such member exists, give it to |
84d737866 [PATCH] add child... |
818 819 |
* the child reaper process (ie "init") in our pid * space. |
1da177e4c Linux-2.6.12-rc2 |
820 |
*/ |
950bbabb5 pid_ns: (BUG 1139... |
821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 |
static struct task_struct *find_new_reaper(struct task_struct *father) { struct pid_namespace *pid_ns = task_active_pid_ns(father); struct task_struct *thread; thread = father; while_each_thread(father, thread) { if (thread->flags & PF_EXITING) continue; if (unlikely(pid_ns->child_reaper == father)) pid_ns->child_reaper = thread; return thread; } if (unlikely(pid_ns->child_reaper == father)) { write_unlock_irq(&tasklist_lock); if (unlikely(pid_ns == &init_pid_ns)) panic("Attempted to kill init!"); zap_pid_ns_processes(pid_ns); write_lock_irq(&tasklist_lock); /* * We can not clear ->child_reaper or leave it alone. * There may by stealth EXIT_DEAD tasks on ->children, * forget_original_parent() must move them somewhere. */ pid_ns->child_reaper = init_pid_ns.child_reaper; } return pid_ns->child_reaper; } |
762a24bee pid namespaces: r... |
852 |
static void forget_original_parent(struct task_struct *father) |
1da177e4c Linux-2.6.12-rc2 |
853 |
{ |
950bbabb5 pid_ns: (BUG 1139... |
854 |
struct task_struct *p, *n, *reaper; |
f470021ad ptrace children r... |
855 |
LIST_HEAD(ptrace_dead); |
762a24bee pid namespaces: r... |
856 857 |
write_lock_irq(&tasklist_lock); |
950bbabb5 pid_ns: (BUG 1139... |
858 |
reaper = find_new_reaper(father); |
f470021ad ptrace children r... |
859 860 861 862 |
/* * First clean up ptrace if we were using it. */ ptrace_exit(father, &ptrace_dead); |
03ff17979 kernel/exit.c: Us... |
863 |
list_for_each_entry_safe(p, n, &father->children, sibling) { |
84eb646b6 handle the multi-... |
864 |
p->real_parent = reaper; |
f470021ad ptrace children r... |
865 866 867 868 869 |
if (p->parent == father) { BUG_ON(p->ptrace); p->parent = p->real_parent; } reparent_thread(p, father); |
1da177e4c Linux-2.6.12-rc2 |
870 |
} |
762a24bee pid namespaces: r... |
871 872 873 |
write_unlock_irq(&tasklist_lock); BUG_ON(!list_empty(&father->children)); |
762a24bee pid namespaces: r... |
874 |
|
f470021ad ptrace children r... |
875 |
ptrace_exit_finish(father, &ptrace_dead); |
1da177e4c Linux-2.6.12-rc2 |
876 877 878 879 880 881 |
} /* * Send signals to all our closest relatives so that they know * to properly mourn us.. */ |
821c7de71 exit_notify: fix ... |
882 |
static void exit_notify(struct task_struct *tsk, int group_dead) |
1da177e4c Linux-2.6.12-rc2 |
883 |
{ |
2b2a1ff64 tracehook: death |
884 885 |
int signal; void *cookie; |
1da177e4c Linux-2.6.12-rc2 |
886 |
|
1da177e4c Linux-2.6.12-rc2 |
887 888 889 890 891 892 893 894 |
/* * This does two things: * * A. Make init inherit all the child processes * B. Check to see if any process groups have become orphaned * as a result of our exiting, and if they have any stopped * jobs, send them a SIGHUP and then a SIGCONT. (POSIX 3.2.2.2) */ |
762a24bee pid namespaces: r... |
895 |
forget_original_parent(tsk); |
2e4a70726 pid namespaces: m... |
896 |
exit_task_namespaces(tsk); |
1da177e4c Linux-2.6.12-rc2 |
897 |
|
762a24bee pid namespaces: r... |
898 |
write_lock_irq(&tasklist_lock); |
821c7de71 exit_notify: fix ... |
899 900 |
if (group_dead) kill_orphaned_pgrp(tsk->group_leader, NULL); |
1da177e4c Linux-2.6.12-rc2 |
901 |
|
247284481 Kill some obsolet... |
902 |
/* Let father know we died |
1da177e4c Linux-2.6.12-rc2 |
903 904 |
* * Thread signals are configurable, but you aren't going to use |
d4c5e41f3 whitespace fixes:... |
905 |
* that to send signals to arbitary processes. |
1da177e4c Linux-2.6.12-rc2 |
906 907 908 909 910 911 912 913 914 |
* That stops right now. * * If the parent exec id doesn't match the exec id we saved * when we started then we know the parent has changed security * domain. * * If our self_exec id doesn't match our parent_exec_id then * we have changed execution domain as these two values started * the same after a fork. |
1da177e4c Linux-2.6.12-rc2 |
915 |
*/ |
d839fd4d2 ptrace: introduce... |
916 |
if (tsk->exit_signal != SIGCHLD && !task_detached(tsk) && |
f49ee505b introduce kill_or... |
917 |
(tsk->parent_exec_id != tsk->real_parent->self_exec_id || |
d839fd4d2 ptrace: introduce... |
918 919 |
tsk->self_exec_id != tsk->parent_exec_id) && !capable(CAP_KILL)) |
1da177e4c Linux-2.6.12-rc2 |
920 |
tsk->exit_signal = SIGCHLD; |
2b2a1ff64 tracehook: death |
921 |
signal = tracehook_notify_death(tsk, &cookie, group_dead); |
5c7edcd7e tracehook: fix ex... |
922 |
if (signal >= 0) |
2b2a1ff64 tracehook: death |
923 |
signal = do_notify_parent(tsk, signal); |
1da177e4c Linux-2.6.12-rc2 |
924 |
|
5c7edcd7e tracehook: fix ex... |
925 |
tsk->exit_state = signal == DEATH_REAP ? EXIT_DEAD : EXIT_ZOMBIE; |
1da177e4c Linux-2.6.12-rc2 |
926 |
|
2800d8d19 document de_threa... |
927 |
/* mt-exec, de_thread() is waiting for us */ |
6db840fa7 exec: RT sub-thre... |
928 |
if (thread_group_leader(tsk) && |
2633f0e57 exit signals: use... |
929 930 |
tsk->signal->group_exit_task && tsk->signal->notify_count < 0) |
6db840fa7 exec: RT sub-thre... |
931 |
wake_up_process(tsk->signal->group_exit_task); |
1da177e4c Linux-2.6.12-rc2 |
932 |
write_unlock_irq(&tasklist_lock); |
2b2a1ff64 tracehook: death |
933 |
tracehook_report_death(tsk, signal, cookie, group_dead); |
1da177e4c Linux-2.6.12-rc2 |
934 |
/* If the process is dead, release it - nobody will wait for it */ |
5c7edcd7e tracehook: fix ex... |
935 |
if (signal == DEATH_REAP) |
1da177e4c Linux-2.6.12-rc2 |
936 |
release_task(tsk); |
1da177e4c Linux-2.6.12-rc2 |
937 |
} |
e18eecb8b Add generic exit-... |
938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 |
#ifdef CONFIG_DEBUG_STACK_USAGE static void check_stack_usage(void) { static DEFINE_SPINLOCK(low_water_lock); static int lowest_to_date = THREAD_SIZE; unsigned long *n = end_of_stack(current); unsigned long free; while (*n == 0) n++; free = (unsigned long)n - (unsigned long)end_of_stack(current); if (free >= lowest_to_date) return; spin_lock(&low_water_lock); if (free < lowest_to_date) { printk(KERN_WARNING "%s used greatest stack depth: %lu bytes " "left ", current->comm, free); lowest_to_date = free; } spin_unlock(&low_water_lock); } #else static inline void check_stack_usage(void) {} #endif |
7ad5b3a50 kernel: remove fa... |
966 |
NORET_TYPE void do_exit(long code) |
1da177e4c Linux-2.6.12-rc2 |
967 968 969 970 971 |
{ struct task_struct *tsk = current; int group_dead; profile_task_exit(tsk); |
22e2c507c [PATCH] Update cf... |
972 |
WARN_ON(atomic_read(&tsk->fs_excl)); |
1da177e4c Linux-2.6.12-rc2 |
973 974 975 976 |
if (unlikely(in_interrupt())) panic("Aiee, killing interrupt handler!"); if (unlikely(!tsk->pid)) panic("Attempted to kill the idle task!"); |
1da177e4c Linux-2.6.12-rc2 |
977 |
|
30199f5a4 tracehook: exit |
978 |
tracehook_report_exit(&code); |
1da177e4c Linux-2.6.12-rc2 |
979 |
|
df164db5f [PATCH] avoid res... |
980 981 982 983 984 985 986 987 |
/* * We're taking recursive faults here in do_exit. Safest is to just * leave this task alone and wait for reboot. */ if (unlikely(tsk->flags & PF_EXITING)) { printk(KERN_ALERT "Fixing recursive fault but reboot is needed! "); |
778e9a9c3 pi-futex: fix exi... |
988 989 990 991 992 993 994 995 996 997 |
/* * We can do this unlocked here. The futex code uses * this flag just to verify whether the pi state * cleanup has been done or not. In the worst case it * loops once more. We pretend that the cleanup was * done as there is no way to return. Either the * OWNER_DIED bit is set by now or we push the blocked * task into the wait for ever nirwana as well. */ tsk->flags |= PF_EXITPIDONE; |
df164db5f [PATCH] avoid res... |
998 999 1000 |
set_current_state(TASK_UNINTERRUPTIBLE); schedule(); } |
d12619b5f fix group stop wi... |
1001 |
exit_signals(tsk); /* sets PF_EXITING */ |
778e9a9c3 pi-futex: fix exi... |
1002 1003 1004 1005 |
/* * tsk->flags are checked in the futex code to protect against * an exiting task cleaning up the robust pi futexes. */ |
d2ee7198c pi-futex: set PF_... |
1006 1007 |
smp_mb(); spin_unlock_wait(&tsk->pi_lock); |
1da177e4c Linux-2.6.12-rc2 |
1008 |
|
1da177e4c Linux-2.6.12-rc2 |
1009 1010 1011 |
if (unlikely(in_atomic())) printk(KERN_INFO "note: %s[%d] exited with preempt_count %d ", |
ba25f9dcc Use helpers to ob... |
1012 |
current->comm, task_pid_nr(current), |
1da177e4c Linux-2.6.12-rc2 |
1013 1014 1015 |
preempt_count()); acct_update_integrals(tsk); |
365e9c87a [PATCH] mm: updat... |
1016 1017 1018 1019 |
if (tsk->mm) { update_hiwater_rss(tsk->mm); update_hiwater_vm(tsk->mm); } |
1da177e4c Linux-2.6.12-rc2 |
1020 |
group_dead = atomic_dec_and_test(&tsk->signal->live); |
c30689516 [PATCH] revert "t... |
1021 |
if (group_dead) { |
778e9a9c3 pi-futex: fix exi... |
1022 |
hrtimer_cancel(&tsk->signal->real_timer); |
25f407f0b [PATCH] Call exit... |
1023 |
exit_itimers(tsk->signal); |
c30689516 [PATCH] revert "t... |
1024 |
} |
f6ec29a42 [PATCH] pacct: av... |
1025 |
acct_collect(code, group_dead); |
522ed7767 Audit: add TTY in... |
1026 1027 |
if (group_dead) tty_audit_exit(); |
fa84cb935 [PATCH] move call... |
1028 1029 |
if (unlikely(tsk->audit_context)) audit_free(tsk); |
115085ea0 [PATCH] taskstats... |
1030 |
|
f2ab6d888 Assign task_struc... |
1031 |
tsk->exit_code = code; |
115085ea0 [PATCH] taskstats... |
1032 |
taskstats_exit(tsk, group_dead); |
c757249af [PATCH] per-task-... |
1033 |
|
1da177e4c Linux-2.6.12-rc2 |
1034 |
exit_mm(tsk); |
0e4648141 [PATCH] pacct: ad... |
1035 |
if (group_dead) |
f6ec29a42 [PATCH] pacct: av... |
1036 |
acct_process(); |
0a16b6075 tracing, sched: L... |
1037 |
trace_sched_process_exit(tsk); |
1da177e4c Linux-2.6.12-rc2 |
1038 |
exit_sem(tsk); |
1ec7f1ddb [PATCH] get rid o... |
1039 1040 |
exit_files(tsk); exit_fs(tsk); |
e18eecb8b Add generic exit-... |
1041 |
check_stack_usage(); |
1da177e4c Linux-2.6.12-rc2 |
1042 |
exit_thread(); |
b4f48b636 Task Control Grou... |
1043 |
cgroup_exit(tsk, 1); |
1da177e4c Linux-2.6.12-rc2 |
1044 1045 1046 |
if (group_dead && tsk->signal->leader) disassociate_ctty(1); |
a1261f546 [PATCH] m68k: int... |
1047 |
module_put(task_thread_info(tsk)->exec_domain->module); |
1da177e4c Linux-2.6.12-rc2 |
1048 1049 |
if (tsk->binfmt) module_put(tsk->binfmt->module); |
9f46080c4 [PATCH] Process E... |
1050 |
proc_exit_connector(tsk); |
821c7de71 exit_notify: fix ... |
1051 |
exit_notify(tsk, group_dead); |
1da177e4c Linux-2.6.12-rc2 |
1052 |
#ifdef CONFIG_NUMA |
f0be3d32b mempolicy: rename... |
1053 |
mpol_put(tsk->mempolicy); |
1da177e4c Linux-2.6.12-rc2 |
1054 1055 |
tsk->mempolicy = NULL; #endif |
42b2dd0a0 Shrink task_struc... |
1056 |
#ifdef CONFIG_FUTEX |
de5097c2e [PATCH] mutex sub... |
1057 |
/* |
c87e2837b [PATCH] pi-futex:... |
1058 1059 1060 1061 1062 1063 1064 |
* This must happen late, after the PID is not * hashed anymore: */ if (unlikely(!list_empty(&tsk->pi_state_list))) exit_pi_state_list(tsk); if (unlikely(current->pi_state_cache)) kfree(current->pi_state_cache); |
42b2dd0a0 Shrink task_struc... |
1065 |
#endif |
c87e2837b [PATCH] pi-futex:... |
1066 |
/* |
9a11b49a8 [PATCH] lockdep: ... |
1067 |
* Make sure we are holding no locks: |
de5097c2e [PATCH] mutex sub... |
1068 |
*/ |
9a11b49a8 [PATCH] lockdep: ... |
1069 |
debug_check_no_locks_held(tsk); |
778e9a9c3 pi-futex: fix exi... |
1070 1071 1072 1073 1074 1075 |
/* * We can do this unlocked here. The futex code uses this flag * just to verify whether the pi state cleanup has been done * or not. In the worst case it loops once more. */ tsk->flags |= PF_EXITPIDONE; |
1da177e4c Linux-2.6.12-rc2 |
1076 |
|
afc847b7d [PATCH] don't do ... |
1077 1078 |
if (tsk->io_context) exit_io_context(); |
b92ce5589 [PATCH] splice: a... |
1079 1080 |
if (tsk->splice_pipe) __free_pipe_info(tsk->splice_pipe); |
7407251a0 [PATCH] PF_DEAD c... |
1081 |
preempt_disable(); |
55a101f8f [PATCH] kill PF_D... |
1082 |
/* causes final put_task_struct in finish_task_switch(). */ |
c394cc9fb [PATCH] introduce... |
1083 |
tsk->state = TASK_DEAD; |
1da177e4c Linux-2.6.12-rc2 |
1084 1085 1086 |
schedule(); BUG(); /* Avoid "noreturn function does return". */ |
54306cf04 [PATCH] exit: fix... |
1087 1088 |
for (;;) cpu_relax(); /* For when BUG is null */ |
1da177e4c Linux-2.6.12-rc2 |
1089 |
} |
012914dad [patch] MCA recov... |
1090 |
EXPORT_SYMBOL_GPL(do_exit); |
1da177e4c Linux-2.6.12-rc2 |
1091 1092 1093 1094 |
NORET_TYPE void complete_and_exit(struct completion *comp, long code) { if (comp) complete(comp); |
55a101f8f [PATCH] kill PF_D... |
1095 |
|
1da177e4c Linux-2.6.12-rc2 |
1096 1097 1098 1099 1100 1101 1102 1103 1104 |
do_exit(code); } EXPORT_SYMBOL(complete_and_exit); asmlinkage long sys_exit(int error_code) { do_exit((error_code&0xff)<<8); } |
1da177e4c Linux-2.6.12-rc2 |
1105 1106 1107 1108 1109 1110 1111 |
/* * Take down every thread in the group. This is called by fatal signals * as well as by sys_exit_group (below). */ NORET_TYPE void do_group_exit(int exit_code) { |
bfc4b0890 signals: do_group... |
1112 |
struct signal_struct *sig = current->signal; |
1da177e4c Linux-2.6.12-rc2 |
1113 |
BUG_ON(exit_code & 0x80); /* core dumps don't get here */ |
bfc4b0890 signals: do_group... |
1114 1115 |
if (signal_group_exit(sig)) exit_code = sig->group_exit_code; |
1da177e4c Linux-2.6.12-rc2 |
1116 |
else if (!thread_group_empty(current)) { |
1da177e4c Linux-2.6.12-rc2 |
1117 |
struct sighand_struct *const sighand = current->sighand; |
1da177e4c Linux-2.6.12-rc2 |
1118 |
spin_lock_irq(&sighand->siglock); |
ed5d2cac1 exec: rework the ... |
1119 |
if (signal_group_exit(sig)) |
1da177e4c Linux-2.6.12-rc2 |
1120 1121 1122 |
/* Another thread got here before we took the lock. */ exit_code = sig->group_exit_code; else { |
1da177e4c Linux-2.6.12-rc2 |
1123 |
sig->group_exit_code = exit_code; |
ed5d2cac1 exec: rework the ... |
1124 |
sig->flags = SIGNAL_GROUP_EXIT; |
1da177e4c Linux-2.6.12-rc2 |
1125 1126 1127 |
zap_other_threads(current); } spin_unlock_irq(&sighand->siglock); |
1da177e4c Linux-2.6.12-rc2 |
1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 |
} do_exit(exit_code); /* NOTREACHED */ } /* * this kills every thread in the thread group. Note that any externally * wait4()-ing process will get the correct exit code - even if this * thread is not the thread group leader. */ asmlinkage void sys_exit_group(int error_code) { do_group_exit((error_code & 0xff) << 8); } |
161550d74 pid: sys_wait... ... |
1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 |
static struct pid *task_pid_type(struct task_struct *task, enum pid_type type) { struct pid *pid = NULL; if (type == PIDTYPE_PID) pid = task->pids[type].pid; else if (type < PIDTYPE_MAX) pid = task->group_leader->pids[type].pid; return pid; } static int eligible_child(enum pid_type type, struct pid *pid, int options, struct task_struct *p) |
1da177e4c Linux-2.6.12-rc2 |
1155 |
{ |
732432844 Return EPERM not ... |
1156 |
int err; |
161550d74 pid: sys_wait... ... |
1157 1158 |
if (type < PIDTYPE_MAX) { if (task_pid_type(p, type) != pid) |
1da177e4c Linux-2.6.12-rc2 |
1159 1160 |
return 0; } |
1da177e4c Linux-2.6.12-rc2 |
1161 1162 1163 1164 1165 1166 1167 1168 |
/* Wait for all children (clone and not) if __WALL is set; * otherwise, wait for clone children *only* if __WCLONE is * set; otherwise, wait for non-clone children *only*. (Note: * A "clone" child here is one that reports to its parent * using a signal other than SIGCHLD.) */ if (((p->exit_signal != SIGCHLD) ^ ((options & __WCLONE) != 0)) && !(options & __WALL)) return 0; |
1da177e4c Linux-2.6.12-rc2 |
1169 |
|
732432844 Return EPERM not ... |
1170 |
err = security_task_wait(p); |
14dd0b814 do_wait: return s... |
1171 1172 |
if (err) return err; |
1da177e4c Linux-2.6.12-rc2 |
1173 |
|
14dd0b814 do_wait: return s... |
1174 |
return 1; |
1da177e4c Linux-2.6.12-rc2 |
1175 |
} |
36c8b5868 [PATCH] sched: cl... |
1176 |
static int wait_noreap_copyout(struct task_struct *p, pid_t pid, uid_t uid, |
1da177e4c Linux-2.6.12-rc2 |
1177 1178 1179 1180 1181 |
int why, int status, struct siginfo __user *infop, struct rusage __user *rusagep) { int retval = rusagep ? getrusage(p, RUSAGE_BOTH, rusagep) : 0; |
36c8b5868 [PATCH] sched: cl... |
1182 |
|
1da177e4c Linux-2.6.12-rc2 |
1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 |
put_task_struct(p); if (!retval) retval = put_user(SIGCHLD, &infop->si_signo); if (!retval) retval = put_user(0, &infop->si_errno); if (!retval) retval = put_user((short)why, &infop->si_code); if (!retval) retval = put_user(pid, &infop->si_pid); if (!retval) retval = put_user(uid, &infop->si_uid); if (!retval) retval = put_user(status, &infop->si_status); if (!retval) retval = pid; return retval; } /* * Handle sys_wait4 work for one task in state EXIT_ZOMBIE. We hold * read_lock(&tasklist_lock) on entry. If we return zero, we still hold * the lock and this task is uninteresting. If we return nonzero, we have * released the lock and the system call should return. */ |
98abed020 do_wait reorganiz... |
1207 |
static int wait_task_zombie(struct task_struct *p, int options, |
1da177e4c Linux-2.6.12-rc2 |
1208 1209 1210 1211 |
struct siginfo __user *infop, int __user *stat_addr, struct rusage __user *ru) { unsigned long state; |
2f4e6e2a8 wait_task_zombie:... |
1212 |
int retval, status, traced; |
6c5f3e7b4 Pidns: make full ... |
1213 |
pid_t pid = task_pid_vnr(p); |
c69e8d9c0 CRED: Use RCU to ... |
1214 |
uid_t uid = __task_cred(p)->uid; |
1da177e4c Linux-2.6.12-rc2 |
1215 |
|
98abed020 do_wait reorganiz... |
1216 1217 1218 1219 |
if (!likely(options & WEXITED)) return 0; if (unlikely(options & WNOWAIT)) { |
1da177e4c Linux-2.6.12-rc2 |
1220 1221 |
int exit_code = p->exit_code; int why, status; |
1da177e4c Linux-2.6.12-rc2 |
1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 |
get_task_struct(p); read_unlock(&tasklist_lock); if ((exit_code & 0x7f) == 0) { why = CLD_EXITED; status = exit_code >> 8; } else { why = (exit_code & 0x80) ? CLD_DUMPED : CLD_KILLED; status = exit_code & 0x7f; } return wait_noreap_copyout(p, pid, uid, why, status, infop, ru); } /* * Try to move the task's state to DEAD * only one thread is allowed to do this: */ state = xchg(&p->exit_state, EXIT_DEAD); if (state != EXIT_ZOMBIE) { BUG_ON(state != EXIT_DEAD); return 0; } |
1da177e4c Linux-2.6.12-rc2 |
1244 |
|
53b6f9fbd ptrace: introduce... |
1245 |
traced = ptrace_reparented(p); |
2f4e6e2a8 wait_task_zombie:... |
1246 1247 |
if (likely(!traced)) { |
3795e1616 [PATCH] Decrease ... |
1248 1249 |
struct signal_struct *psig; struct signal_struct *sig; |
f06febc96 timers: fix itime... |
1250 |
struct task_cputime cputime; |
3795e1616 [PATCH] Decrease ... |
1251 |
|
1da177e4c Linux-2.6.12-rc2 |
1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 |
/* * The resource counters for the group leader are in its * own task_struct. Those for dead threads in the group * are in its signal_struct, as are those for the child * processes it has previously reaped. All these * accumulate in the parent's signal_struct c* fields. * * We don't bother to take a lock here to protect these * p->signal fields, because they are only touched by * __exit_signal, which runs with tasklist_lock * write-locked anyway, and so is excluded here. We do * need to protect the access to p->parent->signal fields, * as other threads in the parent group can be right * here reaping other children at the same time. |
f06febc96 timers: fix itime... |
1266 1267 1268 1269 |
* * We use thread_group_cputime() to get times for the thread * group, which consolidates times for all threads in the * group including the group leader. |
1da177e4c Linux-2.6.12-rc2 |
1270 |
*/ |
2b5fe6de5 thread_group_cput... |
1271 |
thread_group_cputime(p, &cputime); |
1da177e4c Linux-2.6.12-rc2 |
1272 |
spin_lock_irq(&p->parent->sighand->siglock); |
3795e1616 [PATCH] Decrease ... |
1273 1274 1275 1276 |
psig = p->parent->signal; sig = p->signal; psig->cutime = cputime_add(psig->cutime, |
f06febc96 timers: fix itime... |
1277 1278 |
cputime_add(cputime.utime, sig->cutime)); |
3795e1616 [PATCH] Decrease ... |
1279 1280 |
psig->cstime = cputime_add(psig->cstime, |
f06febc96 timers: fix itime... |
1281 1282 |
cputime_add(cputime.stime, sig->cstime)); |
9ac52315d sched: guest CPU ... |
1283 1284 1285 1286 1287 |
psig->cgtime = cputime_add(psig->cgtime, cputime_add(p->gtime, cputime_add(sig->gtime, sig->cgtime))); |
3795e1616 [PATCH] Decrease ... |
1288 1289 1290 1291 1292 1293 1294 1295 |
psig->cmin_flt += p->min_flt + sig->min_flt + sig->cmin_flt; psig->cmaj_flt += p->maj_flt + sig->maj_flt + sig->cmaj_flt; psig->cnvcsw += p->nvcsw + sig->nvcsw + sig->cnvcsw; psig->cnivcsw += p->nivcsw + sig->nivcsw + sig->cnivcsw; |
6eaeeaba3 getrusage(): fill... |
1296 1297 1298 1299 1300 1301 |
psig->cinblock += task_io_get_inblock(p) + sig->inblock + sig->cinblock; psig->coublock += task_io_get_oublock(p) + sig->oublock + sig->coublock; |
5995477ab task IO accountin... |
1302 1303 |
task_io_accounting_add(&psig->ioac, &p->ioac); task_io_accounting_add(&psig->ioac, &sig->ioac); |
1da177e4c Linux-2.6.12-rc2 |
1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 |
spin_unlock_irq(&p->parent->sighand->siglock); } /* * Now we are sure this task is interesting, and no other * thread can reap it because we set its state to EXIT_DEAD. */ read_unlock(&tasklist_lock); retval = ru ? getrusage(p, RUSAGE_BOTH, ru) : 0; status = (p->signal->flags & SIGNAL_GROUP_EXIT) ? p->signal->group_exit_code : p->exit_code; if (!retval && stat_addr) retval = put_user(status, stat_addr); if (!retval && infop) retval = put_user(SIGCHLD, &infop->si_signo); if (!retval && infop) retval = put_user(0, &infop->si_errno); if (!retval && infop) { int why; if ((status & 0x7f) == 0) { why = CLD_EXITED; status >>= 8; } else { why = (status & 0x80) ? CLD_DUMPED : CLD_KILLED; status &= 0x7f; } retval = put_user((short)why, &infop->si_code); if (!retval) retval = put_user(status, &infop->si_status); } if (!retval && infop) |
3a515e4a6 wait_task_continu... |
1337 |
retval = put_user(pid, &infop->si_pid); |
1da177e4c Linux-2.6.12-rc2 |
1338 |
if (!retval && infop) |
c69e8d9c0 CRED: Use RCU to ... |
1339 |
retval = put_user(uid, &infop->si_uid); |
2f4e6e2a8 wait_task_zombie:... |
1340 |
if (!retval) |
3a515e4a6 wait_task_continu... |
1341 |
retval = pid; |
2f4e6e2a8 wait_task_zombie:... |
1342 1343 |
if (traced) { |
1da177e4c Linux-2.6.12-rc2 |
1344 |
write_lock_irq(&tasklist_lock); |
2f4e6e2a8 wait_task_zombie:... |
1345 1346 1347 1348 1349 1350 1351 |
/* We dropped tasklist, ptracer could die and untrace */ ptrace_unlink(p); /* * If this is not a detached task, notify the parent. * If it's still not detached after that, don't release * it now. */ |
d839fd4d2 ptrace: introduce... |
1352 |
if (!task_detached(p)) { |
2f4e6e2a8 wait_task_zombie:... |
1353 |
do_notify_parent(p, p->exit_signal); |
d839fd4d2 ptrace: introduce... |
1354 |
if (!task_detached(p)) { |
2f4e6e2a8 wait_task_zombie:... |
1355 1356 |
p->exit_state = EXIT_ZOMBIE; p = NULL; |
1da177e4c Linux-2.6.12-rc2 |
1357 1358 1359 1360 1361 1362 |
} } write_unlock_irq(&tasklist_lock); } if (p != NULL) release_task(p); |
2f4e6e2a8 wait_task_zombie:... |
1363 |
|
1da177e4c Linux-2.6.12-rc2 |
1364 1365 1366 1367 1368 1369 1370 1371 1372 |
return retval; } /* * Handle sys_wait4 work for one task in state TASK_STOPPED. We hold * read_lock(&tasklist_lock) on entry. If we return zero, we still hold * the lock and this task is uninteresting. If we return nonzero, we have * released the lock and the system call should return. */ |
f470021ad ptrace children r... |
1373 |
static int wait_task_stopped(int ptrace, struct task_struct *p, |
98abed020 do_wait reorganiz... |
1374 |
int options, struct siginfo __user *infop, |
1da177e4c Linux-2.6.12-rc2 |
1375 1376 |
int __user *stat_addr, struct rusage __user *ru) { |
ee7c82da8 wait_task_stopped... |
1377 1378 |
int retval, exit_code, why; uid_t uid = 0; /* unneeded, required by compiler */ |
c89507835 wait_task_stopped... |
1379 |
pid_t pid; |
1da177e4c Linux-2.6.12-rc2 |
1380 |
|
f470021ad ptrace children r... |
1381 |
if (!(options & WUNTRACED)) |
98abed020 do_wait reorganiz... |
1382 |
return 0; |
ee7c82da8 wait_task_stopped... |
1383 1384 1385 1386 1387 |
exit_code = 0; spin_lock_irq(&p->sighand->siglock); if (unlikely(!task_is_stopped_or_traced(p))) goto unlock_sig; |
f470021ad ptrace children r... |
1388 |
if (!ptrace && p->signal->group_stop_count > 0) |
1da177e4c Linux-2.6.12-rc2 |
1389 1390 1391 1392 |
/* * A group stop is in progress and this is the group leader. * We won't report until all threads have stopped. */ |
ee7c82da8 wait_task_stopped... |
1393 1394 1395 1396 1397 |
goto unlock_sig; exit_code = p->exit_code; if (!exit_code) goto unlock_sig; |
98abed020 do_wait reorganiz... |
1398 |
if (!unlikely(options & WNOWAIT)) |
ee7c82da8 wait_task_stopped... |
1399 |
p->exit_code = 0; |
c69e8d9c0 CRED: Use RCU to ... |
1400 1401 |
/* don't need the RCU readlock here as we're holding a spinlock */ uid = __task_cred(p)->uid; |
ee7c82da8 wait_task_stopped... |
1402 1403 1404 |
unlock_sig: spin_unlock_irq(&p->sighand->siglock); if (!exit_code) |
1da177e4c Linux-2.6.12-rc2 |
1405 1406 1407 1408 1409 1410 1411 1412 1413 1414 |
return 0; /* * Now we are pretty sure this task is interesting. * Make sure it doesn't get reaped out from under us while we * give up the lock and then examine it below. We don't want to * keep holding onto the tasklist_lock while we call getrusage and * possibly take page faults for user memory. */ get_task_struct(p); |
6c5f3e7b4 Pidns: make full ... |
1415 |
pid = task_pid_vnr(p); |
f470021ad ptrace children r... |
1416 |
why = ptrace ? CLD_TRAPPED : CLD_STOPPED; |
1da177e4c Linux-2.6.12-rc2 |
1417 |
read_unlock(&tasklist_lock); |
98abed020 do_wait reorganiz... |
1418 |
if (unlikely(options & WNOWAIT)) |
1da177e4c Linux-2.6.12-rc2 |
1419 |
return wait_noreap_copyout(p, pid, uid, |
e6ceb32aa wait_task_stopped... |
1420 |
why, exit_code, |
1da177e4c Linux-2.6.12-rc2 |
1421 |
infop, ru); |
1da177e4c Linux-2.6.12-rc2 |
1422 1423 1424 1425 1426 1427 1428 1429 1430 |
retval = ru ? getrusage(p, RUSAGE_BOTH, ru) : 0; if (!retval && stat_addr) retval = put_user((exit_code << 8) | 0x7f, stat_addr); if (!retval && infop) retval = put_user(SIGCHLD, &infop->si_signo); if (!retval && infop) retval = put_user(0, &infop->si_errno); if (!retval && infop) |
6efcae460 Fix waitid si_cod... |
1431 |
retval = put_user((short)why, &infop->si_code); |
1da177e4c Linux-2.6.12-rc2 |
1432 1433 1434 |
if (!retval && infop) retval = put_user(exit_code, &infop->si_status); if (!retval && infop) |
c89507835 wait_task_stopped... |
1435 |
retval = put_user(pid, &infop->si_pid); |
1da177e4c Linux-2.6.12-rc2 |
1436 |
if (!retval && infop) |
ee7c82da8 wait_task_stopped... |
1437 |
retval = put_user(uid, &infop->si_uid); |
1da177e4c Linux-2.6.12-rc2 |
1438 |
if (!retval) |
c89507835 wait_task_stopped... |
1439 |
retval = pid; |
1da177e4c Linux-2.6.12-rc2 |
1440 1441 1442 1443 1444 1445 1446 1447 1448 1449 1450 1451 |
put_task_struct(p); BUG_ON(!retval); return retval; } /* * Handle do_wait work for one task in a live, non-stopped state. * read_lock(&tasklist_lock) on entry. If we return zero, we still hold * the lock and this task is uninteresting. If we return nonzero, we have * released the lock and the system call should return. */ |
98abed020 do_wait reorganiz... |
1452 |
static int wait_task_continued(struct task_struct *p, int options, |
1da177e4c Linux-2.6.12-rc2 |
1453 1454 1455 1456 1457 1458 |
struct siginfo __user *infop, int __user *stat_addr, struct rusage __user *ru) { int retval; pid_t pid; uid_t uid; |
98abed020 do_wait reorganiz... |
1459 1460 |
if (!unlikely(options & WCONTINUED)) return 0; |
1da177e4c Linux-2.6.12-rc2 |
1461 1462 1463 1464 1465 1466 1467 1468 1469 |
if (!(p->signal->flags & SIGNAL_STOP_CONTINUED)) return 0; spin_lock_irq(&p->sighand->siglock); /* Re-check with the lock held. */ if (!(p->signal->flags & SIGNAL_STOP_CONTINUED)) { spin_unlock_irq(&p->sighand->siglock); return 0; } |
98abed020 do_wait reorganiz... |
1470 |
if (!unlikely(options & WNOWAIT)) |
1da177e4c Linux-2.6.12-rc2 |
1471 |
p->signal->flags &= ~SIGNAL_STOP_CONTINUED; |
c69e8d9c0 CRED: Use RCU to ... |
1472 |
uid = __task_cred(p)->uid; |
1da177e4c Linux-2.6.12-rc2 |
1473 |
spin_unlock_irq(&p->sighand->siglock); |
6c5f3e7b4 Pidns: make full ... |
1474 |
pid = task_pid_vnr(p); |
1da177e4c Linux-2.6.12-rc2 |
1475 1476 1477 1478 1479 1480 1481 1482 1483 |
get_task_struct(p); read_unlock(&tasklist_lock); if (!infop) { retval = ru ? getrusage(p, RUSAGE_BOTH, ru) : 0; put_task_struct(p); if (!retval && stat_addr) retval = put_user(0xffff, stat_addr); if (!retval) |
3a515e4a6 wait_task_continu... |
1484 |
retval = pid; |
1da177e4c Linux-2.6.12-rc2 |
1485 1486 1487 1488 1489 1490 1491 1492 1493 |
} else { retval = wait_noreap_copyout(p, pid, uid, CLD_CONTINUED, SIGCONT, infop, ru); BUG_ON(retval == 0); } return retval; } |
98abed020 do_wait reorganiz... |
1494 1495 1496 1497 1498 1499 |
/* * Consider @p for a wait by @parent. * * -ECHILD should be in *@notask_error before the first call. * Returns nonzero for a final return, when we have unlocked tasklist_lock. * Returns zero if the search for a child should continue; |
14dd0b814 do_wait: return s... |
1500 1501 |
* then *@notask_error is 0 if @p is an eligible child, * or another error from security_task_wait(), or still -ECHILD. |
98abed020 do_wait reorganiz... |
1502 |
*/ |
f470021ad ptrace children r... |
1503 |
static int wait_consider_task(struct task_struct *parent, int ptrace, |
98abed020 do_wait reorganiz... |
1504 1505 1506 1507 1508 1509 |
struct task_struct *p, int *notask_error, enum pid_type type, struct pid *pid, int options, struct siginfo __user *infop, int __user *stat_addr, struct rusage __user *ru) { int ret = eligible_child(type, pid, options, p); |
14dd0b814 do_wait: return s... |
1510 |
if (!ret) |
98abed020 do_wait reorganiz... |
1511 |
return ret; |
14dd0b814 do_wait: return s... |
1512 1513 1514 1515 1516 1517 1518 1519 1520 1521 1522 |
if (unlikely(ret < 0)) { /* * If we have not yet seen any eligible child, * then let this error code replace -ECHILD. * A permission error will give the user a clue * to look for security policy problems, rather * than for mysterious wait bugs. */ if (*notask_error) *notask_error = ret; } |
f470021ad ptrace children r... |
1523 1524 1525 1526 1527 1528 1529 1530 |
if (likely(!ptrace) && unlikely(p->ptrace)) { /* * This child is hidden by ptrace. * We aren't allowed to see it now, but eventually we will. */ *notask_error = 0; return 0; } |
98abed020 do_wait reorganiz... |
1531 1532 1533 1534 1535 1536 1537 1538 1539 1540 1541 1542 1543 1544 1545 1546 |
if (p->exit_state == EXIT_DEAD) return 0; /* * We don't reap group leaders with subthreads. */ if (p->exit_state == EXIT_ZOMBIE && !delay_group_leader(p)) return wait_task_zombie(p, options, infop, stat_addr, ru); /* * It's stopped or running now, so it might * later continue, exit, or stop again. */ *notask_error = 0; if (task_is_stopped_or_traced(p)) |
f470021ad ptrace children r... |
1547 1548 |
return wait_task_stopped(ptrace, p, options, infop, stat_addr, ru); |
98abed020 do_wait reorganiz... |
1549 1550 1551 1552 1553 1554 1555 1556 1557 1558 |
return wait_task_continued(p, options, infop, stat_addr, ru); } /* * Do the work of do_wait() for one thread in the group, @tsk. * * -ECHILD should be in *@notask_error before the first call. * Returns nonzero for a final return, when we have unlocked tasklist_lock. * Returns zero if the search for a child should continue; then |
14dd0b814 do_wait: return s... |
1559 1560 |
* *@notask_error is 0 if there were any eligible children, * or another error from security_task_wait(), or still -ECHILD. |
98abed020 do_wait reorganiz... |
1561 1562 1563 1564 1565 1566 1567 1568 1569 |
*/ static int do_wait_thread(struct task_struct *tsk, int *notask_error, enum pid_type type, struct pid *pid, int options, struct siginfo __user *infop, int __user *stat_addr, struct rusage __user *ru) { struct task_struct *p; list_for_each_entry(p, &tsk->children, sibling) { |
f470021ad ptrace children r... |
1570 1571 1572 1573 1574 1575 1576 1577 1578 1579 |
/* * Do not consider detached threads. */ if (!task_detached(p)) { int ret = wait_consider_task(tsk, 0, p, notask_error, type, pid, options, infop, stat_addr, ru); if (ret) return ret; } |
98abed020 do_wait reorganiz... |
1580 1581 1582 1583 1584 1585 1586 1587 1588 1589 1590 1591 1592 |
} return 0; } static int ptrace_do_wait(struct task_struct *tsk, int *notask_error, enum pid_type type, struct pid *pid, int options, struct siginfo __user *infop, int __user *stat_addr, struct rusage __user *ru) { struct task_struct *p; /* |
f470021ad ptrace children r... |
1593 |
* Traditionally we see ptrace'd stopped tasks regardless of options. |
98abed020 do_wait reorganiz... |
1594 |
*/ |
f470021ad ptrace children r... |
1595 |
options |= WUNTRACED; |
98abed020 do_wait reorganiz... |
1596 |
|
f470021ad ptrace children r... |
1597 1598 1599 1600 1601 |
list_for_each_entry(p, &tsk->ptraced, ptrace_entry) { int ret = wait_consider_task(tsk, 1, p, notask_error, type, pid, options, infop, stat_addr, ru); if (ret) |
98abed020 do_wait reorganiz... |
1602 |
return ret; |
98abed020 do_wait reorganiz... |
1603 1604 1605 1606 |
} return 0; } |
161550d74 pid: sys_wait... ... |
1607 1608 1609 |
static long do_wait(enum pid_type type, struct pid *pid, int options, struct siginfo __user *infop, int __user *stat_addr, struct rusage __user *ru) |
1da177e4c Linux-2.6.12-rc2 |
1610 1611 1612 |
{ DECLARE_WAITQUEUE(wait, current); struct task_struct *tsk; |
98abed020 do_wait reorganiz... |
1613 |
int retval; |
1da177e4c Linux-2.6.12-rc2 |
1614 |
|
0a16b6075 tracing, sched: L... |
1615 |
trace_sched_process_wait(pid); |
1da177e4c Linux-2.6.12-rc2 |
1616 1617 |
add_wait_queue(¤t->signal->wait_chldexit,&wait); repeat: |
98abed020 do_wait reorganiz... |
1618 1619 1620 1621 1622 |
/* * If there is nothing that can match our critiera just get out. * We will clear @retval to zero if we see any child that might later * match our criteria, even if we are not able to reap it yet. */ |
161550d74 pid: sys_wait... ... |
1623 1624 1625 |
retval = -ECHILD; if ((type < PIDTYPE_MAX) && (!pid || hlist_empty(&pid->tasks[type]))) goto end; |
1da177e4c Linux-2.6.12-rc2 |
1626 1627 1628 1629 |
current->state = TASK_INTERRUPTIBLE; read_lock(&tasklist_lock); tsk = current; do { |
98abed020 do_wait reorganiz... |
1630 1631 1632 1633 1634 1635 1636 1637 1638 1639 1640 1641 1642 |
int tsk_result = do_wait_thread(tsk, &retval, type, pid, options, infop, stat_addr, ru); if (!tsk_result) tsk_result = ptrace_do_wait(tsk, &retval, type, pid, options, infop, stat_addr, ru); if (tsk_result) { /* * tasklist_lock is unlocked and we have a final result. */ retval = tsk_result; goto end; |
1da177e4c Linux-2.6.12-rc2 |
1643 |
} |
98abed020 do_wait reorganiz... |
1644 |
|
1da177e4c Linux-2.6.12-rc2 |
1645 1646 1647 |
if (options & __WNOTHREAD) break; tsk = next_thread(tsk); |
125e18745 [PATCH] More BUG_... |
1648 |
BUG_ON(tsk->signal != current->signal); |
1da177e4c Linux-2.6.12-rc2 |
1649 |
} while (tsk != current); |
1da177e4c Linux-2.6.12-rc2 |
1650 |
read_unlock(&tasklist_lock); |
f2cc3eb13 do_wait: fix secu... |
1651 |
|
98abed020 do_wait reorganiz... |
1652 |
if (!retval && !(options & WNOHANG)) { |
1da177e4c Linux-2.6.12-rc2 |
1653 |
retval = -ERESTARTSYS; |
98abed020 do_wait reorganiz... |
1654 1655 1656 1657 |
if (!signal_pending(current)) { schedule(); goto repeat; } |
1da177e4c Linux-2.6.12-rc2 |
1658 |
} |
98abed020 do_wait reorganiz... |
1659 |
|
1da177e4c Linux-2.6.12-rc2 |
1660 1661 1662 1663 1664 |
end: current->state = TASK_RUNNING; remove_wait_queue(¤t->signal->wait_chldexit,&wait); if (infop) { if (retval > 0) |
9cbab8100 do_wait: factor o... |
1665 |
retval = 0; |
1da177e4c Linux-2.6.12-rc2 |
1666 1667 1668 1669 1670 1671 1672 1673 1674 1675 1676 1677 1678 1679 1680 1681 1682 1683 1684 1685 1686 1687 |
else { /* * For a WNOHANG return, clear out all the fields * we would set so the user can easily tell the * difference. */ if (!retval) retval = put_user(0, &infop->si_signo); if (!retval) retval = put_user(0, &infop->si_errno); if (!retval) retval = put_user(0, &infop->si_code); if (!retval) retval = put_user(0, &infop->si_pid); if (!retval) retval = put_user(0, &infop->si_uid); if (!retval) retval = put_user(0, &infop->si_status); } } return retval; } |
161550d74 pid: sys_wait... ... |
1688 |
asmlinkage long sys_waitid(int which, pid_t upid, |
1da177e4c Linux-2.6.12-rc2 |
1689 1690 1691 |
struct siginfo __user *infop, int options, struct rusage __user *ru) { |
161550d74 pid: sys_wait... ... |
1692 1693 |
struct pid *pid = NULL; enum pid_type type; |
1da177e4c Linux-2.6.12-rc2 |
1694 1695 1696 1697 1698 1699 1700 1701 1702 |
long ret; if (options & ~(WNOHANG|WNOWAIT|WEXITED|WSTOPPED|WCONTINUED)) return -EINVAL; if (!(options & (WEXITED|WSTOPPED|WCONTINUED))) return -EINVAL; switch (which) { case P_ALL: |
161550d74 pid: sys_wait... ... |
1703 |
type = PIDTYPE_MAX; |
1da177e4c Linux-2.6.12-rc2 |
1704 1705 |
break; case P_PID: |
161550d74 pid: sys_wait... ... |
1706 1707 |
type = PIDTYPE_PID; if (upid <= 0) |
1da177e4c Linux-2.6.12-rc2 |
1708 1709 1710 |
return -EINVAL; break; case P_PGID: |
161550d74 pid: sys_wait... ... |
1711 1712 |
type = PIDTYPE_PGID; if (upid <= 0) |
1da177e4c Linux-2.6.12-rc2 |
1713 |
return -EINVAL; |
1da177e4c Linux-2.6.12-rc2 |
1714 1715 1716 1717 |
break; default: return -EINVAL; } |
161550d74 pid: sys_wait... ... |
1718 1719 1720 1721 |
if (type < PIDTYPE_MAX) pid = find_get_pid(upid); ret = do_wait(type, pid, options, infop, NULL, ru); put_pid(pid); |
1da177e4c Linux-2.6.12-rc2 |
1722 1723 |
/* avoid REGPARM breakage on x86: */ |
54a015104 asmlinkage_protec... |
1724 |
asmlinkage_protect(5, ret, which, upid, infop, options, ru); |
1da177e4c Linux-2.6.12-rc2 |
1725 1726 |
return ret; } |
161550d74 pid: sys_wait... ... |
1727 |
asmlinkage long sys_wait4(pid_t upid, int __user *stat_addr, |
1da177e4c Linux-2.6.12-rc2 |
1728 1729 |
int options, struct rusage __user *ru) { |
161550d74 pid: sys_wait... ... |
1730 1731 |
struct pid *pid = NULL; enum pid_type type; |
1da177e4c Linux-2.6.12-rc2 |
1732 1733 1734 1735 1736 |
long ret; if (options & ~(WNOHANG|WUNTRACED|WCONTINUED| __WNOTHREAD|__WCLONE|__WALL)) return -EINVAL; |
161550d74 pid: sys_wait... ... |
1737 1738 1739 1740 1741 1742 1743 1744 1745 1746 1747 1748 1749 1750 1751 1752 |
if (upid == -1) type = PIDTYPE_MAX; else if (upid < 0) { type = PIDTYPE_PGID; pid = find_get_pid(-upid); } else if (upid == 0) { type = PIDTYPE_PGID; pid = get_pid(task_pgrp(current)); } else /* upid > 0 */ { type = PIDTYPE_PID; pid = find_get_pid(upid); } ret = do_wait(type, pid, options | WEXITED, NULL, stat_addr, ru); put_pid(pid); |
1da177e4c Linux-2.6.12-rc2 |
1753 1754 |
/* avoid REGPARM breakage on x86: */ |
54a015104 asmlinkage_protec... |
1755 |
asmlinkage_protect(4, ret, upid, stat_addr, options, ru); |
1da177e4c Linux-2.6.12-rc2 |
1756 1757 1758 1759 1760 1761 1762 1763 1764 1765 1766 1767 1768 1769 1770 |
return ret; } #ifdef __ARCH_WANT_SYS_WAITPID /* * sys_waitpid() remains for compatibility. waitpid() should be * implemented by calling sys_wait4() from libc.a. */ asmlinkage long sys_waitpid(pid_t pid, int __user *stat_addr, int options) { return sys_wait4(pid, stat_addr, options, NULL); } #endif |