Blame view
kernel/exit.c
45.6 KB
1da177e4c Linux-2.6.12-rc2 |
1 2 3 4 5 |
/* * linux/kernel/exit.c * * Copyright (C) 1991, 1992 Linus Torvalds */ |
1da177e4c Linux-2.6.12-rc2 |
6 7 8 |
#include <linux/mm.h> #include <linux/slab.h> #include <linux/interrupt.h> |
1da177e4c Linux-2.6.12-rc2 |
9 |
#include <linux/module.h> |
c59ede7b7 [PATCH] move capa... |
10 |
#include <linux/capability.h> |
1da177e4c Linux-2.6.12-rc2 |
11 12 13 |
#include <linux/completion.h> #include <linux/personality.h> #include <linux/tty.h> |
6b3286ed1 [PATCH] rename st... |
14 |
#include <linux/mnt_namespace.h> |
da9cbc873 block: blkdev.h c... |
15 |
#include <linux/iocontext.h> |
1da177e4c Linux-2.6.12-rc2 |
16 17 18 19 |
#include <linux/key.h> #include <linux/security.h> #include <linux/cpu.h> #include <linux/acct.h> |
8f0ab5147 [PATCH] csa: conv... |
20 |
#include <linux/tsacct_kern.h> |
1da177e4c Linux-2.6.12-rc2 |
21 |
#include <linux/file.h> |
9f3acc314 [PATCH] split lin... |
22 |
#include <linux/fdtable.h> |
1da177e4c Linux-2.6.12-rc2 |
23 |
#include <linux/binfmts.h> |
ab516013a [PATCH] namespace... |
24 |
#include <linux/nsproxy.h> |
84d737866 [PATCH] add child... |
25 |
#include <linux/pid_namespace.h> |
1da177e4c Linux-2.6.12-rc2 |
26 27 28 29 |
#include <linux/ptrace.h> #include <linux/profile.h> #include <linux/mount.h> #include <linux/proc_fs.h> |
49d769d52 Change reparent_t... |
30 |
#include <linux/kthread.h> |
1da177e4c Linux-2.6.12-rc2 |
31 |
#include <linux/mempolicy.h> |
c757249af [PATCH] per-task-... |
32 |
#include <linux/taskstats_kern.h> |
ca74e92b4 [PATCH] per-task-... |
33 |
#include <linux/delayacct.h> |
831441862 Freezer: make ker... |
34 |
#include <linux/freezer.h> |
b4f48b636 Task Control Grou... |
35 |
#include <linux/cgroup.h> |
1da177e4c Linux-2.6.12-rc2 |
36 |
#include <linux/syscalls.h> |
7ed20e1ad [PATCH] convert t... |
37 |
#include <linux/signal.h> |
6a14c5c9d [PATCH] move __ex... |
38 |
#include <linux/posix-timers.h> |
9f46080c4 [PATCH] Process E... |
39 |
#include <linux/cn_proc.h> |
de5097c2e [PATCH] mutex sub... |
40 |
#include <linux/mutex.h> |
0771dfefc [PATCH] lightweig... |
41 |
#include <linux/futex.h> |
34f192c65 [PATCH] lightweig... |
42 |
#include <linux/compat.h> |
b92ce5589 [PATCH] splice: a... |
43 |
#include <linux/pipe_fs_i.h> |
fa84cb935 [PATCH] move call... |
44 |
#include <linux/audit.h> /* for audit_free() */ |
83cc5ed3c [PATCH] kernel/sy... |
45 |
#include <linux/resource.h> |
0d67a46df [PATCH] BLOCK: Re... |
46 |
#include <linux/blkdev.h> |
6eaeeaba3 getrusage(): fill... |
47 |
#include <linux/task_io_accounting_ops.h> |
30199f5a4 tracehook: exit |
48 |
#include <linux/tracehook.h> |
1da177e4c Linux-2.6.12-rc2 |
49 50 51 52 53 |
#include <asm/uaccess.h> #include <asm/unistd.h> #include <asm/pgtable.h> #include <asm/mmu_context.h> |
408b664a7 [PATCH] make lots... |
54 |
static void exit_mm(struct task_struct * tsk); |
d839fd4d2 ptrace: introduce... |
55 56 57 58 |
static inline int task_detached(struct task_struct *p) { return p->exit_signal == -1; } |
1da177e4c Linux-2.6.12-rc2 |
59 60 61 62 |
static void __unhash_process(struct task_struct *p) { nr_threads--; detach_pid(p, PIDTYPE_PID); |
1da177e4c Linux-2.6.12-rc2 |
63 64 65 |
if (thread_group_leader(p)) { detach_pid(p, PIDTYPE_PGID); detach_pid(p, PIDTYPE_SID); |
c97d98931 [PATCH] kill SET_... |
66 |
|
5e85d4abe [PATCH] task: Mak... |
67 |
list_del_rcu(&p->tasks); |
73b9ebfe1 [PATCH] pidhash: ... |
68 |
__get_cpu_var(process_counts)--; |
1da177e4c Linux-2.6.12-rc2 |
69 |
} |
47e65328a [PATCH] pids: kil... |
70 |
list_del_rcu(&p->thread_group); |
f470021ad ptrace children r... |
71 |
list_del_init(&p->sibling); |
1da177e4c Linux-2.6.12-rc2 |
72 |
} |
6a14c5c9d [PATCH] move __ex... |
73 74 75 76 77 78 79 80 81 82 |
/* * 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)); |
6a14c5c9d [PATCH] move __ex... |
83 84 85 86 87 88 89 90 91 92 93 |
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: */ |
6db840fa7 exec: RT sub-thre... |
94 |
if (sig->group_exit_task && atomic_read(&sig->count) == sig->notify_count) |
6a14c5c9d [PATCH] move __ex... |
95 |
wake_up_process(sig->group_exit_task); |
6db840fa7 exec: RT sub-thre... |
96 |
|
6a14c5c9d [PATCH] move __ex... |
97 98 99 100 101 102 103 104 105 106 107 108 |
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. */ |
49048622e sched: fix proces... |
109 110 111 |
sig->utime = cputime_add(sig->utime, task_utime(tsk)); sig->stime = cputime_add(sig->stime, task_stime(tsk)); sig->gtime = cputime_add(sig->gtime, task_gtime(tsk)); |
6a14c5c9d [PATCH] move __ex... |
112 113 114 115 |
sig->min_flt += tsk->min_flt; sig->maj_flt += tsk->maj_flt; sig->nvcsw += tsk->nvcsw; sig->nivcsw += tsk->nivcsw; |
6eaeeaba3 getrusage(): fill... |
116 117 |
sig->inblock += task_io_get_inblock(tsk); sig->oublock += task_io_get_oublock(tsk); |
5995477ab task IO accountin... |
118 |
task_io_accounting_add(&sig->ioac, &tsk->ioac); |
172ba844a sched: update del... |
119 |
sig->sum_sched_runtime += tsk->se.sum_exec_runtime; |
6a14c5c9d [PATCH] move __ex... |
120 121 |
sig = NULL; /* Marker for below. */ } |
5876700cd [PATCH] do __unha... |
122 |
__unhash_process(tsk); |
da7978b03 signals: fix sigq... |
123 124 125 126 127 |
/* * Do this under ->siglock, we can race with another thread * doing sigqueue_free() if we have SIGQUEUE_PREALLOC signals. */ flush_sigqueue(&tsk->pending); |
6a14c5c9d [PATCH] move __ex... |
128 |
tsk->signal = NULL; |
a7e5328a0 [PATCH] cleanup _... |
129 |
tsk->sighand = NULL; |
6a14c5c9d [PATCH] move __ex... |
130 |
spin_unlock(&sighand->siglock); |
6a14c5c9d [PATCH] move __ex... |
131 |
|
a7e5328a0 [PATCH] cleanup _... |
132 |
__cleanup_sighand(sighand); |
6a14c5c9d [PATCH] move __ex... |
133 |
clear_tsk_thread_flag(tsk,TIF_SIGPENDING); |
6a14c5c9d [PATCH] move __ex... |
134 135 |
if (sig) { flush_sigqueue(&sig->shared_pending); |
093a8e8ae [PATCH] taskstats... |
136 |
taskstats_tgid_free(sig); |
6a14c5c9d [PATCH] move __ex... |
137 138 139 |
__cleanup_signal(sig); } } |
8c7904a00 [PATCH] task: RCU... |
140 141 142 143 |
static void delayed_put_task_struct(struct rcu_head *rhp) { put_task_struct(container_of(rhp, struct task_struct, rcu)); } |
f470021ad ptrace children r... |
144 |
|
1da177e4c Linux-2.6.12-rc2 |
145 146 |
void release_task(struct task_struct * p) { |
36c8b5868 [PATCH] sched: cl... |
147 |
struct task_struct *leader; |
1da177e4c Linux-2.6.12-rc2 |
148 |
int zap_leader; |
1f09f9749 [PATCH] release_t... |
149 |
repeat: |
dae33574d tracehook: releas... |
150 |
tracehook_prepare_release_task(p); |
1da177e4c Linux-2.6.12-rc2 |
151 |
atomic_dec(&p->user->processes); |
60347f671 pid namespaces: p... |
152 |
proc_flush_task(p); |
1da177e4c Linux-2.6.12-rc2 |
153 |
write_lock_irq(&tasklist_lock); |
dae33574d tracehook: releas... |
154 |
tracehook_finish_release_task(p); |
1da177e4c Linux-2.6.12-rc2 |
155 |
__exit_signal(p); |
35f5cad8c [PATCH] revert "O... |
156 |
|
1da177e4c Linux-2.6.12-rc2 |
157 158 159 160 161 162 163 164 |
/* * 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) { |
d839fd4d2 ptrace: introduce... |
165 |
BUG_ON(task_detached(leader)); |
1da177e4c Linux-2.6.12-rc2 |
166 167 168 169 170 171 172 173 174 |
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. */ |
d839fd4d2 ptrace: introduce... |
175 |
zap_leader = task_detached(leader); |
dae33574d tracehook: releas... |
176 177 178 179 180 181 182 |
/* * 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; |
1da177e4c Linux-2.6.12-rc2 |
183 |
} |
1da177e4c Linux-2.6.12-rc2 |
184 |
write_unlock_irq(&tasklist_lock); |
1da177e4c Linux-2.6.12-rc2 |
185 |
release_thread(p); |
8c7904a00 [PATCH] task: RCU... |
186 |
call_rcu(&p->rcu, delayed_put_task_struct); |
1da177e4c Linux-2.6.12-rc2 |
187 188 189 190 191 |
p = leader; if (unlikely(zap_leader)) goto repeat; } |
1da177e4c Linux-2.6.12-rc2 |
192 193 194 195 |
/* * 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... |
04a2e6a5c [PATCH] pid: make... |
196 197 |
* * The caller must hold rcu lock or the tasklist lock. |
1da177e4c Linux-2.6.12-rc2 |
198 |
*/ |
04a2e6a5c [PATCH] pid: make... |
199 |
struct pid *session_of_pgrp(struct pid *pgrp) |
1da177e4c Linux-2.6.12-rc2 |
200 201 |
{ struct task_struct *p; |
04a2e6a5c [PATCH] pid: make... |
202 |
struct pid *sid = NULL; |
62dfb5541 [PATCH] session_o... |
203 |
|
04a2e6a5c [PATCH] pid: make... |
204 |
p = pid_task(pgrp, PIDTYPE_PGID); |
62dfb5541 [PATCH] session_o... |
205 |
if (p == NULL) |
04a2e6a5c [PATCH] pid: make... |
206 |
p = pid_task(pgrp, PIDTYPE_PID); |
62dfb5541 [PATCH] session_o... |
207 |
if (p != NULL) |
04a2e6a5c [PATCH] pid: make... |
208 |
sid = task_session(p); |
62dfb5541 [PATCH] session_o... |
209 |
|
1da177e4c Linux-2.6.12-rc2 |
210 211 212 213 214 215 216 217 218 219 220 |
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?" */ |
0475ac084 [PATCH] pid: use ... |
221 |
static int will_become_orphaned_pgrp(struct pid *pgrp, struct task_struct *ignored_task) |
1da177e4c Linux-2.6.12-rc2 |
222 223 |
{ struct task_struct *p; |
1da177e4c Linux-2.6.12-rc2 |
224 |
|
0475ac084 [PATCH] pid: use ... |
225 |
do_each_pid_task(pgrp, PIDTYPE_PGID, p) { |
05e83df62 will_become_orpha... |
226 227 228 |
if ((p == ignored_task) || (p->exit_state && thread_group_empty(p)) || is_global_init(p->real_parent)) |
1da177e4c Linux-2.6.12-rc2 |
229 |
continue; |
05e83df62 will_become_orpha... |
230 |
|
0475ac084 [PATCH] pid: use ... |
231 |
if (task_pgrp(p->real_parent) != pgrp && |
05e83df62 will_become_orpha... |
232 233 |
task_session(p->real_parent) == task_session(p)) return 0; |
0475ac084 [PATCH] pid: use ... |
234 |
} while_each_pid_task(pgrp, PIDTYPE_PGID, p); |
05e83df62 will_become_orpha... |
235 236 |
return 1; |
1da177e4c Linux-2.6.12-rc2 |
237 |
} |
3e7cd6c41 [PATCH] pid: repl... |
238 |
int is_current_pgrp_orphaned(void) |
1da177e4c Linux-2.6.12-rc2 |
239 240 241 242 |
{ int retval; read_lock(&tasklist_lock); |
3e7cd6c41 [PATCH] pid: repl... |
243 |
retval = will_become_orphaned_pgrp(task_pgrp(current), NULL); |
1da177e4c Linux-2.6.12-rc2 |
244 245 246 247 |
read_unlock(&tasklist_lock); return retval; } |
0475ac084 [PATCH] pid: use ... |
248 |
static int has_stopped_jobs(struct pid *pgrp) |
1da177e4c Linux-2.6.12-rc2 |
249 250 251 |
{ int retval = 0; struct task_struct *p; |
0475ac084 [PATCH] pid: use ... |
252 |
do_each_pid_task(pgrp, PIDTYPE_PGID, p) { |
338077e54 exit: Use task_is_* |
253 |
if (!task_is_stopped(p)) |
1da177e4c Linux-2.6.12-rc2 |
254 |
continue; |
1da177e4c Linux-2.6.12-rc2 |
255 256 |
retval = 1; break; |
0475ac084 [PATCH] pid: use ... |
257 |
} while_each_pid_task(pgrp, PIDTYPE_PGID, p); |
1da177e4c Linux-2.6.12-rc2 |
258 259 |
return retval; } |
f49ee505b introduce kill_or... |
260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 |
/* * 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); } } |
1da177e4c Linux-2.6.12-rc2 |
290 |
/** |
49d769d52 Change reparent_t... |
291 |
* reparent_to_kthreadd - Reparent the calling kernel thread to kthreadd |
1da177e4c Linux-2.6.12-rc2 |
292 293 |
* * If a kernel thread is launched as a result of a system call, or if |
49d769d52 Change reparent_t... |
294 295 |
* 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. |
1da177e4c Linux-2.6.12-rc2 |
296 297 298 299 |
* * 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. * |
49d769d52 Change reparent_t... |
300 |
* NOTE that reparent_to_kthreadd() gives the caller full capabilities. |
1da177e4c Linux-2.6.12-rc2 |
301 |
*/ |
49d769d52 Change reparent_t... |
302 |
static void reparent_to_kthreadd(void) |
1da177e4c Linux-2.6.12-rc2 |
303 304 305 306 307 |
{ write_lock_irq(&tasklist_lock); ptrace_unlink(current); /* Reparent to init */ |
49d769d52 Change reparent_t... |
308 |
current->real_parent = current->parent = kthreadd_task; |
f470021ad ptrace children r... |
309 |
list_move_tail(¤t->sibling, ¤t->real_parent->children); |
1da177e4c Linux-2.6.12-rc2 |
310 311 312 |
/* Set the exit signal to SIGCHLD so we signal init on exit */ current->exit_signal = SIGCHLD; |
e05606d33 sched: clean up t... |
313 |
if (task_nice(current) < 0) |
1da177e4c Linux-2.6.12-rc2 |
314 315 316 317 318 319 320 321 322 323 324 |
set_user_nice(current, 0); /* cpus_allowed? */ /* rt_priority? */ /* signals? */ security_task_reparent_to_init(current); memcpy(current->signal->rlim, init_task.signal->rlim, sizeof(current->signal->rlim)); atomic_inc(&(INIT_USER->__count)); write_unlock_irq(&tasklist_lock); switch_uid(INIT_USER); } |
8520d7c7f teach set_special... |
325 |
void __set_special_pids(struct pid *pid) |
1da177e4c Linux-2.6.12-rc2 |
326 |
{ |
e19f247a3 [PATCH] setpgid: ... |
327 |
struct task_struct *curr = current->group_leader; |
8520d7c7f teach set_special... |
328 |
pid_t nr = pid_nr(pid); |
1da177e4c Linux-2.6.12-rc2 |
329 |
|
8520d7c7f teach set_special... |
330 |
if (task_session(curr) != pid) { |
7d8da0962 pids: __set_speci... |
331 |
change_pid(curr, PIDTYPE_SID, pid); |
8520d7c7f teach set_special... |
332 |
set_task_session(curr, nr); |
1da177e4c Linux-2.6.12-rc2 |
333 |
} |
8520d7c7f teach set_special... |
334 |
if (task_pgrp(curr) != pid) { |
7d8da0962 pids: __set_speci... |
335 |
change_pid(curr, PIDTYPE_PGID, pid); |
8520d7c7f teach set_special... |
336 |
set_task_pgrp(curr, nr); |
1da177e4c Linux-2.6.12-rc2 |
337 338 |
} } |
8520d7c7f teach set_special... |
339 |
static void set_special_pids(struct pid *pid) |
1da177e4c Linux-2.6.12-rc2 |
340 341 |
{ write_lock_irq(&tasklist_lock); |
8520d7c7f teach set_special... |
342 |
__set_special_pids(pid); |
1da177e4c Linux-2.6.12-rc2 |
343 344 345 346 347 348 349 350 351 352 |
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) { |
7ed20e1ad [PATCH] convert t... |
353 |
if (!valid_signal(sig) || sig < 1) |
1da177e4c Linux-2.6.12-rc2 |
354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 |
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) { |
7ed20e1ad [PATCH] convert t... |
374 |
if (!valid_signal(sig) || sig < 1) |
1da177e4c Linux-2.6.12-rc2 |
375 376 377 |
return -EINVAL; spin_lock_irq(¤t->sighand->siglock); |
10ab825bd change kernel thr... |
378 |
current->sighand->action[(sig)-1].sa.sa_handler = SIG_IGN; |
1da177e4c Linux-2.6.12-rc2 |
379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 |
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... |
407 408 409 410 |
/* * We don't want to have TIF_FREEZE set if the system-wide hibernation * or suspend transition begins right now. */ |
7b34e4283 introduce PF_KTHR... |
411 |
current->flags |= (PF_NOFREEZE | PF_KTHREAD); |
1da177e4c Linux-2.6.12-rc2 |
412 |
|
8520d7c7f teach set_special... |
413 414 415 416 |
if (current->nsproxy != &init_nsproxy) { get_nsproxy(&init_nsproxy); switch_task_namespaces(current, &init_nsproxy); } |
297bd42b1 move daemonized k... |
417 |
set_special_pids(&init_struct_pid); |
24ec839c4 [PATCH] tty: ->si... |
418 |
proc_clear_tty(current); |
1da177e4c Linux-2.6.12-rc2 |
419 420 421 422 423 424 425 426 427 428 429 430 |
/* 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... |
431 |
|
d4c5e41f3 whitespace fixes:... |
432 |
exit_files(current); |
1da177e4c Linux-2.6.12-rc2 |
433 434 |
current->files = init_task.files; atomic_inc(¤t->files->count); |
49d769d52 Change reparent_t... |
435 |
reparent_to_kthreadd(); |
1da177e4c Linux-2.6.12-rc2 |
436 437 438 |
} EXPORT_SYMBOL(daemonize); |
858119e15 [PATCH] Unlinline... |
439 |
static void close_files(struct files_struct * files) |
1da177e4c Linux-2.6.12-rc2 |
440 441 |
{ int i, j; |
badf16621 [PATCH] files: br... |
442 |
struct fdtable *fdt; |
1da177e4c Linux-2.6.12-rc2 |
443 444 |
j = 0; |
4fb3a5386 [PATCH] files: fi... |
445 446 447 448 449 450 |
/* * 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... |
451 |
fdt = files_fdtable(files); |
1da177e4c Linux-2.6.12-rc2 |
452 453 454 |
for (;;) { unsigned long set; i = j * __NFDBITS; |
bbea9f696 [PATCH] fdtable: ... |
455 |
if (i >= fdt->max_fds) |
1da177e4c Linux-2.6.12-rc2 |
456 |
break; |
badf16621 [PATCH] files: br... |
457 |
set = fdt->open_fds->fds_bits[j++]; |
1da177e4c Linux-2.6.12-rc2 |
458 459 |
while (set) { if (set & 1) { |
badf16621 [PATCH] files: br... |
460 |
struct file * file = xchg(&fdt->fd[i], NULL); |
944be0b22 [PATCH] close_fil... |
461 |
if (file) { |
1da177e4c Linux-2.6.12-rc2 |
462 |
filp_close(file, files); |
944be0b22 [PATCH] close_fil... |
463 464 |
cond_resched(); } |
1da177e4c Linux-2.6.12-rc2 |
465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 |
} 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... |
484 |
void put_files_struct(struct files_struct *files) |
1da177e4c Linux-2.6.12-rc2 |
485 |
{ |
badf16621 [PATCH] files: br... |
486 |
struct fdtable *fdt; |
1da177e4c Linux-2.6.12-rc2 |
487 488 489 490 |
if (atomic_dec_and_test(&files->count)) { close_files(files); /* * Free the fd and fdset arrays if we expanded them. |
ab2af1f50 [PATCH] files: fi... |
491 492 493 |
* 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 |
494 |
*/ |
badf16621 [PATCH] files: br... |
495 |
fdt = files_fdtable(files); |
4fd45812c [PATCH] fdtable: ... |
496 |
if (fdt != &files->fdtab) |
ab2af1f50 [PATCH] files: fi... |
497 |
kmem_cache_free(files_cachep, files); |
01b2d93ca [PATCH] fdtable: ... |
498 |
free_fdtable(fdt); |
1da177e4c Linux-2.6.12-rc2 |
499 500 |
} } |
3b1253880 [PATCH] sanitize ... |
501 |
void reset_files_struct(struct files_struct *files) |
3b9b8ab65 [PATCH] Fix unser... |
502 |
{ |
3b1253880 [PATCH] sanitize ... |
503 |
struct task_struct *tsk = current; |
3b9b8ab65 [PATCH] Fix unser... |
504 505 506 507 508 509 510 511 |
struct files_struct *old; old = tsk->files; task_lock(tsk); tsk->files = files; task_unlock(tsk); put_files_struct(old); } |
3b9b8ab65 [PATCH] Fix unser... |
512 |
|
1ec7f1ddb [PATCH] get rid o... |
513 |
void exit_files(struct task_struct *tsk) |
1da177e4c Linux-2.6.12-rc2 |
514 515 516 517 518 519 520 521 522 523 |
{ 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... |
524 |
void put_fs_struct(struct fs_struct *fs) |
1da177e4c Linux-2.6.12-rc2 |
525 526 527 |
{ /* No need to hold fs->lock if we are killing it */ if (atomic_dec_and_test(&fs->count)) { |
6ac08c39a Use struct path i... |
528 529 |
path_put(&fs->root); path_put(&fs->pwd); |
1da177e4c Linux-2.6.12-rc2 |
530 531 532 |
kmem_cache_free(fs_cachep, fs); } } |
1ec7f1ddb [PATCH] get rid o... |
533 |
void exit_fs(struct task_struct *tsk) |
1da177e4c Linux-2.6.12-rc2 |
534 535 536 537 538 539 540 |
{ struct fs_struct * fs = tsk->fs; if (fs) { task_lock(tsk); tsk->fs = NULL; task_unlock(tsk); |
1ec7f1ddb [PATCH] get rid o... |
541 |
put_fs_struct(fs); |
1da177e4c Linux-2.6.12-rc2 |
542 543 |
} } |
1da177e4c Linux-2.6.12-rc2 |
544 |
EXPORT_SYMBOL_GPL(exit_fs); |
cf475ad28 cgroups: add an o... |
545 546 547 548 549 550 551 552 553 554 555 |
#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... |
556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 |
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... |
598 599 600 601 602 603 604 605 606 607 |
/* * 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... |
608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 |
return; assign_new_owner: BUG_ON(c == p); get_task_struct(c); /* * The task_lock protects c->mm from changing. * We always want mm->owner->mm == mm */ task_lock(c); /* * Delay read_unlock() till we have the task_lock() * to ensure that c does not slip away underneath us */ read_unlock(&tasklist_lock); if (c->mm != mm) { task_unlock(c); put_task_struct(c); goto retry; } cgroup_mm_owner_callbacks(mm->owner, c); mm->owner = c; task_unlock(c); put_task_struct(c); } #endif /* CONFIG_MM_OWNER */ |
1da177e4c Linux-2.6.12-rc2 |
634 635 636 637 |
/* * Turn us into a lazy TLB process if we * aren't already.. */ |
408b664a7 [PATCH] make lots... |
638 |
static void exit_mm(struct task_struct * tsk) |
1da177e4c Linux-2.6.12-rc2 |
639 640 |
{ struct mm_struct *mm = tsk->mm; |
b564daf80 coredump: constru... |
641 |
struct core_state *core_state; |
1da177e4c Linux-2.6.12-rc2 |
642 643 644 645 646 647 |
mm_release(tsk, mm); if (!mm) return; /* * Serialize with any possible pending coredump. |
999d9fc16 coredump: move mm... |
648 |
* We must hold mmap_sem around checking core_state |
1da177e4c Linux-2.6.12-rc2 |
649 |
* and clearing tsk->mm. The core-inducing thread |
999d9fc16 coredump: move mm... |
650 |
* will increment ->nr_threads for each thread in the |
1da177e4c Linux-2.6.12-rc2 |
651 652 653 |
* group with ->mm != NULL. */ down_read(&mm->mmap_sem); |
b564daf80 coredump: constru... |
654 655 656 |
core_state = mm->core_state; if (core_state) { struct core_thread self; |
1da177e4c Linux-2.6.12-rc2 |
657 |
up_read(&mm->mmap_sem); |
c5f1cc8c1 coredump: turn co... |
658 |
|
b564daf80 coredump: constru... |
659 660 661 662 663 664 665 666 |
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 |
667 |
|
a94e2d408 coredump: kill mm... |
668 669 670 671 672 673 674 |
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 |
675 676 677 |
down_read(&mm->mmap_sem); } atomic_inc(&mm->mm_count); |
125e18745 [PATCH] More BUG_... |
678 |
BUG_ON(mm != tsk->active_mm); |
1da177e4c Linux-2.6.12-rc2 |
679 680 681 682 683 |
/* 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... |
684 685 |
/* We don't want this task to be frozen prematurely */ clear_freeze_flag(tsk); |
1da177e4c Linux-2.6.12-rc2 |
686 |
task_unlock(tsk); |
cf475ad28 cgroups: add an o... |
687 |
mm_update_next_owner(mm); |
1da177e4c Linux-2.6.12-rc2 |
688 689 |
mmput(mm); } |
f470021ad ptrace children r... |
690 |
/* |
666f164f4 fix dangling zomb... |
691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 |
* 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... |
708 709 710 711 712 713 |
* 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 |
714 |
{ |
f470021ad ptrace children r... |
715 |
struct task_struct *p, *n; |
666f164f4 fix dangling zomb... |
716 |
int ign = -1; |
241ceee0b [PATCH] restore -... |
717 |
|
f470021ad ptrace children r... |
718 719 720 721 722 723 724 725 726 727 728 729 730 731 |
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... |
732 733 |
* 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 |
734 |
*/ |
f470021ad ptrace children r... |
735 736 737 |
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... |
738 739 740 741 742 743 |
else { if (ign < 0) ign = ignoring_children(parent); if (ign) p->exit_signal = -1; } |
f470021ad ptrace children r... |
744 |
} |
1da177e4c Linux-2.6.12-rc2 |
745 |
|
f470021ad ptrace children r... |
746 |
if (task_detached(p)) { |
1da177e4c Linux-2.6.12-rc2 |
747 |
/* |
f470021ad ptrace children r... |
748 |
* Mark it as in the process of being reaped. |
1da177e4c Linux-2.6.12-rc2 |
749 |
*/ |
f470021ad ptrace children r... |
750 751 |
p->exit_state = EXIT_DEAD; list_add(&p->ptrace_entry, dead); |
1da177e4c Linux-2.6.12-rc2 |
752 753 |
} } |
f470021ad ptrace children r... |
754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 |
} /* * 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 |
781 |
|
b2b2cbc4b [PATCH] Fix repar... |
782 783 784 |
/* If this is a threaded reparent there is no need to * notify anyone anything has happened. */ |
376e1d253 reparent_thread: ... |
785 |
if (same_thread_group(p->real_parent, father)) |
b2b2cbc4b [PATCH] Fix repar... |
786 787 788 |
return; /* We don't want people slaying init. */ |
d839fd4d2 ptrace: introduce... |
789 |
if (!task_detached(p)) |
b2b2cbc4b [PATCH] Fix repar... |
790 |
p->exit_signal = SIGCHLD; |
b2b2cbc4b [PATCH] Fix repar... |
791 792 793 794 |
/* If we'd notified the old parent about this child's death, * also notify the new parent. */ |
f470021ad ptrace children r... |
795 796 |
if (!ptrace_reparented(p) && p->exit_state == EXIT_ZOMBIE && |
d839fd4d2 ptrace: introduce... |
797 |
!task_detached(p) && thread_group_empty(p)) |
b2b2cbc4b [PATCH] Fix repar... |
798 |
do_notify_parent(p, p->exit_signal); |
f49ee505b introduce kill_or... |
799 |
kill_orphaned_pgrp(p, father); |
1da177e4c Linux-2.6.12-rc2 |
800 801 802 803 804 805 |
} /* * 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... |
806 807 |
* the child reaper process (ie "init") in our pid * space. |
1da177e4c Linux-2.6.12-rc2 |
808 |
*/ |
950bbabb5 pid_ns: (BUG 1139... |
809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 |
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... |
840 |
static void forget_original_parent(struct task_struct *father) |
1da177e4c Linux-2.6.12-rc2 |
841 |
{ |
950bbabb5 pid_ns: (BUG 1139... |
842 |
struct task_struct *p, *n, *reaper; |
f470021ad ptrace children r... |
843 |
LIST_HEAD(ptrace_dead); |
762a24bee pid namespaces: r... |
844 845 |
write_lock_irq(&tasklist_lock); |
950bbabb5 pid_ns: (BUG 1139... |
846 |
reaper = find_new_reaper(father); |
f470021ad ptrace children r... |
847 848 849 850 |
/* * First clean up ptrace if we were using it. */ ptrace_exit(father, &ptrace_dead); |
03ff17979 kernel/exit.c: Us... |
851 |
list_for_each_entry_safe(p, n, &father->children, sibling) { |
84eb646b6 handle the multi-... |
852 |
p->real_parent = reaper; |
f470021ad ptrace children r... |
853 854 855 856 857 |
if (p->parent == father) { BUG_ON(p->ptrace); p->parent = p->real_parent; } reparent_thread(p, father); |
1da177e4c Linux-2.6.12-rc2 |
858 |
} |
762a24bee pid namespaces: r... |
859 860 861 |
write_unlock_irq(&tasklist_lock); BUG_ON(!list_empty(&father->children)); |
762a24bee pid namespaces: r... |
862 |
|
f470021ad ptrace children r... |
863 |
ptrace_exit_finish(father, &ptrace_dead); |
1da177e4c Linux-2.6.12-rc2 |
864 865 866 867 868 869 |
} /* * Send signals to all our closest relatives so that they know * to properly mourn us.. */ |
821c7de71 exit_notify: fix ... |
870 |
static void exit_notify(struct task_struct *tsk, int group_dead) |
1da177e4c Linux-2.6.12-rc2 |
871 |
{ |
2b2a1ff64 tracehook: death |
872 873 |
int signal; void *cookie; |
1da177e4c Linux-2.6.12-rc2 |
874 |
|
1da177e4c Linux-2.6.12-rc2 |
875 876 877 878 879 880 881 882 |
/* * 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... |
883 |
forget_original_parent(tsk); |
2e4a70726 pid namespaces: m... |
884 |
exit_task_namespaces(tsk); |
1da177e4c Linux-2.6.12-rc2 |
885 |
|
762a24bee pid namespaces: r... |
886 |
write_lock_irq(&tasklist_lock); |
821c7de71 exit_notify: fix ... |
887 888 |
if (group_dead) kill_orphaned_pgrp(tsk->group_leader, NULL); |
1da177e4c Linux-2.6.12-rc2 |
889 |
|
247284481 Kill some obsolet... |
890 |
/* Let father know we died |
1da177e4c Linux-2.6.12-rc2 |
891 892 |
* * Thread signals are configurable, but you aren't going to use |
d4c5e41f3 whitespace fixes:... |
893 |
* that to send signals to arbitary processes. |
1da177e4c Linux-2.6.12-rc2 |
894 895 896 897 898 899 900 901 902 |
* 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 |
903 |
*/ |
d839fd4d2 ptrace: introduce... |
904 |
if (tsk->exit_signal != SIGCHLD && !task_detached(tsk) && |
f49ee505b introduce kill_or... |
905 |
(tsk->parent_exec_id != tsk->real_parent->self_exec_id || |
d839fd4d2 ptrace: introduce... |
906 907 |
tsk->self_exec_id != tsk->parent_exec_id) && !capable(CAP_KILL)) |
1da177e4c Linux-2.6.12-rc2 |
908 |
tsk->exit_signal = SIGCHLD; |
2b2a1ff64 tracehook: death |
909 |
signal = tracehook_notify_death(tsk, &cookie, group_dead); |
5c7edcd7e tracehook: fix ex... |
910 |
if (signal >= 0) |
2b2a1ff64 tracehook: death |
911 |
signal = do_notify_parent(tsk, signal); |
1da177e4c Linux-2.6.12-rc2 |
912 |
|
5c7edcd7e tracehook: fix ex... |
913 |
tsk->exit_state = signal == DEATH_REAP ? EXIT_DEAD : EXIT_ZOMBIE; |
1da177e4c Linux-2.6.12-rc2 |
914 |
|
2800d8d19 document de_threa... |
915 |
/* mt-exec, de_thread() is waiting for us */ |
6db840fa7 exec: RT sub-thre... |
916 |
if (thread_group_leader(tsk) && |
2633f0e57 exit signals: use... |
917 918 |
tsk->signal->group_exit_task && tsk->signal->notify_count < 0) |
6db840fa7 exec: RT sub-thre... |
919 |
wake_up_process(tsk->signal->group_exit_task); |
1da177e4c Linux-2.6.12-rc2 |
920 |
write_unlock_irq(&tasklist_lock); |
2b2a1ff64 tracehook: death |
921 |
tracehook_report_death(tsk, signal, cookie, group_dead); |
1da177e4c Linux-2.6.12-rc2 |
922 |
/* If the process is dead, release it - nobody will wait for it */ |
5c7edcd7e tracehook: fix ex... |
923 |
if (signal == DEATH_REAP) |
1da177e4c Linux-2.6.12-rc2 |
924 |
release_task(tsk); |
1da177e4c Linux-2.6.12-rc2 |
925 |
} |
e18eecb8b Add generic exit-... |
926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 |
#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... |
954 |
NORET_TYPE void do_exit(long code) |
1da177e4c Linux-2.6.12-rc2 |
955 956 957 958 959 |
{ struct task_struct *tsk = current; int group_dead; profile_task_exit(tsk); |
22e2c507c [PATCH] Update cf... |
960 |
WARN_ON(atomic_read(&tsk->fs_excl)); |
1da177e4c Linux-2.6.12-rc2 |
961 962 963 964 |
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 |
965 |
|
30199f5a4 tracehook: exit |
966 |
tracehook_report_exit(&code); |
1da177e4c Linux-2.6.12-rc2 |
967 |
|
df164db5f [PATCH] avoid res... |
968 969 970 971 972 973 974 975 |
/* * 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... |
976 977 978 979 980 981 982 983 984 985 |
/* * 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; |
afc847b7d [PATCH] don't do ... |
986 987 |
if (tsk->io_context) exit_io_context(); |
df164db5f [PATCH] avoid res... |
988 989 990 |
set_current_state(TASK_UNINTERRUPTIBLE); schedule(); } |
d12619b5f fix group stop wi... |
991 |
exit_signals(tsk); /* sets PF_EXITING */ |
778e9a9c3 pi-futex: fix exi... |
992 993 994 995 |
/* * 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_... |
996 997 |
smp_mb(); spin_unlock_wait(&tsk->pi_lock); |
1da177e4c Linux-2.6.12-rc2 |
998 |
|
1da177e4c Linux-2.6.12-rc2 |
999 1000 1001 |
if (unlikely(in_atomic())) printk(KERN_INFO "note: %s[%d] exited with preempt_count %d ", |
ba25f9dcc Use helpers to ob... |
1002 |
current->comm, task_pid_nr(current), |
1da177e4c Linux-2.6.12-rc2 |
1003 1004 1005 |
preempt_count()); acct_update_integrals(tsk); |
365e9c87a [PATCH] mm: updat... |
1006 1007 1008 1009 |
if (tsk->mm) { update_hiwater_rss(tsk->mm); update_hiwater_vm(tsk->mm); } |
1da177e4c Linux-2.6.12-rc2 |
1010 |
group_dead = atomic_dec_and_test(&tsk->signal->live); |
c30689516 [PATCH] revert "t... |
1011 |
if (group_dead) { |
778e9a9c3 pi-futex: fix exi... |
1012 |
hrtimer_cancel(&tsk->signal->real_timer); |
25f407f0b [PATCH] Call exit... |
1013 |
exit_itimers(tsk->signal); |
c30689516 [PATCH] revert "t... |
1014 |
} |
f6ec29a42 [PATCH] pacct: av... |
1015 |
acct_collect(code, group_dead); |
42b2dd0a0 Shrink task_struc... |
1016 |
#ifdef CONFIG_FUTEX |
0771dfefc [PATCH] lightweig... |
1017 1018 |
if (unlikely(tsk->robust_list)) exit_robust_list(tsk); |
42b2dd0a0 Shrink task_struc... |
1019 |
#ifdef CONFIG_COMPAT |
34f192c65 [PATCH] lightweig... |
1020 1021 1022 |
if (unlikely(tsk->compat_robust_list)) compat_exit_robust_list(tsk); #endif |
42b2dd0a0 Shrink task_struc... |
1023 |
#endif |
522ed7767 Audit: add TTY in... |
1024 1025 |
if (group_dead) tty_audit_exit(); |
fa84cb935 [PATCH] move call... |
1026 1027 |
if (unlikely(tsk->audit_context)) audit_free(tsk); |
115085ea0 [PATCH] taskstats... |
1028 |
|
f2ab6d888 Assign task_struc... |
1029 |
tsk->exit_code = code; |
115085ea0 [PATCH] taskstats... |
1030 |
taskstats_exit(tsk, group_dead); |
c757249af [PATCH] per-task-... |
1031 |
|
1da177e4c Linux-2.6.12-rc2 |
1032 |
exit_mm(tsk); |
0e4648141 [PATCH] pacct: ad... |
1033 |
if (group_dead) |
f6ec29a42 [PATCH] pacct: av... |
1034 |
acct_process(); |
1da177e4c Linux-2.6.12-rc2 |
1035 |
exit_sem(tsk); |
1ec7f1ddb [PATCH] get rid o... |
1036 1037 |
exit_files(tsk); exit_fs(tsk); |
e18eecb8b Add generic exit-... |
1038 |
check_stack_usage(); |
1da177e4c Linux-2.6.12-rc2 |
1039 |
exit_thread(); |
b4f48b636 Task Control Grou... |
1040 |
cgroup_exit(tsk, 1); |
1da177e4c Linux-2.6.12-rc2 |
1041 1042 1043 1044 |
exit_keys(tsk); if (group_dead && tsk->signal->leader) disassociate_ctty(1); |
a1261f546 [PATCH] m68k: int... |
1045 |
module_put(task_thread_info(tsk)->exec_domain->module); |
1da177e4c Linux-2.6.12-rc2 |
1046 1047 |
if (tsk->binfmt) module_put(tsk->binfmt->module); |
9f46080c4 [PATCH] Process E... |
1048 |
proc_exit_connector(tsk); |
821c7de71 exit_notify: fix ... |
1049 |
exit_notify(tsk, group_dead); |
1da177e4c Linux-2.6.12-rc2 |
1050 |
#ifdef CONFIG_NUMA |
f0be3d32b mempolicy: rename... |
1051 |
mpol_put(tsk->mempolicy); |
1da177e4c Linux-2.6.12-rc2 |
1052 1053 |
tsk->mempolicy = NULL; #endif |
42b2dd0a0 Shrink task_struc... |
1054 |
#ifdef CONFIG_FUTEX |
de5097c2e [PATCH] mutex sub... |
1055 |
/* |
c87e2837b [PATCH] pi-futex:... |
1056 1057 1058 1059 1060 1061 1062 |
* 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... |
1063 |
#endif |
c87e2837b [PATCH] pi-futex:... |
1064 |
/* |
9a11b49a8 [PATCH] lockdep: ... |
1065 |
* Make sure we are holding no locks: |
de5097c2e [PATCH] mutex sub... |
1066 |
*/ |
9a11b49a8 [PATCH] lockdep: ... |
1067 |
debug_check_no_locks_held(tsk); |
778e9a9c3 pi-futex: fix exi... |
1068 1069 1070 1071 1072 1073 |
/* * 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 |
1074 |
|
afc847b7d [PATCH] don't do ... |
1075 1076 |
if (tsk->io_context) exit_io_context(); |
b92ce5589 [PATCH] splice: a... |
1077 1078 |
if (tsk->splice_pipe) __free_pipe_info(tsk->splice_pipe); |
7407251a0 [PATCH] PF_DEAD c... |
1079 |
preempt_disable(); |
55a101f8f [PATCH] kill PF_D... |
1080 |
/* causes final put_task_struct in finish_task_switch(). */ |
c394cc9fb [PATCH] introduce... |
1081 |
tsk->state = TASK_DEAD; |
7407251a0 [PATCH] PF_DEAD c... |
1082 |
|
1da177e4c Linux-2.6.12-rc2 |
1083 1084 1085 |
schedule(); BUG(); /* Avoid "noreturn function does return". */ |
54306cf04 [PATCH] exit: fix... |
1086 1087 |
for (;;) cpu_relax(); /* For when BUG is null */ |
1da177e4c Linux-2.6.12-rc2 |
1088 |
} |
012914dad [patch] MCA recov... |
1089 |
EXPORT_SYMBOL_GPL(do_exit); |
1da177e4c Linux-2.6.12-rc2 |
1090 1091 1092 1093 |
NORET_TYPE void complete_and_exit(struct completion *comp, long code) { if (comp) complete(comp); |
55a101f8f [PATCH] kill PF_D... |
1094 |
|
1da177e4c Linux-2.6.12-rc2 |
1095 1096 1097 1098 1099 1100 1101 1102 1103 |
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 |
1104 1105 1106 1107 1108 1109 1110 |
/* * 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... |
1111 |
struct signal_struct *sig = current->signal; |
1da177e4c Linux-2.6.12-rc2 |
1112 |
BUG_ON(exit_code & 0x80); /* core dumps don't get here */ |
bfc4b0890 signals: do_group... |
1113 1114 |
if (signal_group_exit(sig)) exit_code = sig->group_exit_code; |
1da177e4c Linux-2.6.12-rc2 |
1115 |
else if (!thread_group_empty(current)) { |
1da177e4c Linux-2.6.12-rc2 |
1116 |
struct sighand_struct *const sighand = current->sighand; |
1da177e4c Linux-2.6.12-rc2 |
1117 |
spin_lock_irq(&sighand->siglock); |
ed5d2cac1 exec: rework the ... |
1118 |
if (signal_group_exit(sig)) |
1da177e4c Linux-2.6.12-rc2 |
1119 1120 1121 |
/* Another thread got here before we took the lock. */ exit_code = sig->group_exit_code; else { |
1da177e4c Linux-2.6.12-rc2 |
1122 |
sig->group_exit_code = exit_code; |
ed5d2cac1 exec: rework the ... |
1123 |
sig->flags = SIGNAL_GROUP_EXIT; |
1da177e4c Linux-2.6.12-rc2 |
1124 1125 1126 |
zap_other_threads(current); } spin_unlock_irq(&sighand->siglock); |
1da177e4c Linux-2.6.12-rc2 |
1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 |
} 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... ... |
1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 |
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 |
1154 |
{ |
732432844 Return EPERM not ... |
1155 |
int err; |
161550d74 pid: sys_wait... ... |
1156 1157 |
if (type < PIDTYPE_MAX) { if (task_pid_type(p, type) != pid) |
1da177e4c Linux-2.6.12-rc2 |
1158 1159 |
return 0; } |
1da177e4c Linux-2.6.12-rc2 |
1160 1161 1162 1163 1164 1165 1166 1167 |
/* 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 |
1168 |
|
732432844 Return EPERM not ... |
1169 |
err = security_task_wait(p); |
14dd0b814 do_wait: return s... |
1170 1171 |
if (err) return err; |
1da177e4c Linux-2.6.12-rc2 |
1172 |
|
14dd0b814 do_wait: return s... |
1173 |
return 1; |
1da177e4c Linux-2.6.12-rc2 |
1174 |
} |
36c8b5868 [PATCH] sched: cl... |
1175 |
static int wait_noreap_copyout(struct task_struct *p, pid_t pid, uid_t uid, |
1da177e4c Linux-2.6.12-rc2 |
1176 1177 1178 1179 1180 |
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... |
1181 |
|
1da177e4c Linux-2.6.12-rc2 |
1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 |
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... |
1206 |
static int wait_task_zombie(struct task_struct *p, int options, |
1da177e4c Linux-2.6.12-rc2 |
1207 1208 1209 1210 |
struct siginfo __user *infop, int __user *stat_addr, struct rusage __user *ru) { unsigned long state; |
2f4e6e2a8 wait_task_zombie:... |
1211 |
int retval, status, traced; |
6c5f3e7b4 Pidns: make full ... |
1212 |
pid_t pid = task_pid_vnr(p); |
1da177e4c Linux-2.6.12-rc2 |
1213 |
|
98abed020 do_wait reorganiz... |
1214 1215 1216 1217 |
if (!likely(options & WEXITED)) return 0; if (unlikely(options & WNOWAIT)) { |
1da177e4c Linux-2.6.12-rc2 |
1218 1219 1220 |
uid_t uid = p->uid; int exit_code = p->exit_code; int why, status; |
1da177e4c Linux-2.6.12-rc2 |
1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 |
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 |
1243 |
|
53b6f9fbd ptrace: introduce... |
1244 |
traced = ptrace_reparented(p); |
2f4e6e2a8 wait_task_zombie:... |
1245 1246 |
if (likely(!traced)) { |
3795e1616 [PATCH] Decrease ... |
1247 1248 |
struct signal_struct *psig; struct signal_struct *sig; |
1da177e4c Linux-2.6.12-rc2 |
1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 |
/* * 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. */ spin_lock_irq(&p->parent->sighand->siglock); |
3795e1616 [PATCH] Decrease ... |
1265 1266 1267 1268 |
psig = p->parent->signal; sig = p->signal; psig->cutime = cputime_add(psig->cutime, |
1da177e4c Linux-2.6.12-rc2 |
1269 |
cputime_add(p->utime, |
3795e1616 [PATCH] Decrease ... |
1270 1271 1272 1273 |
cputime_add(sig->utime, sig->cutime))); psig->cstime = cputime_add(psig->cstime, |
1da177e4c Linux-2.6.12-rc2 |
1274 |
cputime_add(p->stime, |
3795e1616 [PATCH] Decrease ... |
1275 1276 |
cputime_add(sig->stime, sig->cstime))); |
9ac52315d sched: guest CPU ... |
1277 1278 1279 1280 1281 |
psig->cgtime = cputime_add(psig->cgtime, cputime_add(p->gtime, cputime_add(sig->gtime, sig->cgtime))); |
3795e1616 [PATCH] Decrease ... |
1282 1283 1284 1285 1286 1287 1288 1289 |
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... |
1290 1291 1292 1293 1294 1295 |
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... |
1296 1297 |
task_io_accounting_add(&psig->ioac, &p->ioac); task_io_accounting_add(&psig->ioac, &sig->ioac); |
1da177e4c Linux-2.6.12-rc2 |
1298 1299 1300 1301 1302 1303 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 |
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... |
1331 |
retval = put_user(pid, &infop->si_pid); |
1da177e4c Linux-2.6.12-rc2 |
1332 1333 |
if (!retval && infop) retval = put_user(p->uid, &infop->si_uid); |
2f4e6e2a8 wait_task_zombie:... |
1334 |
if (!retval) |
3a515e4a6 wait_task_continu... |
1335 |
retval = pid; |
2f4e6e2a8 wait_task_zombie:... |
1336 1337 |
if (traced) { |
1da177e4c Linux-2.6.12-rc2 |
1338 |
write_lock_irq(&tasklist_lock); |
2f4e6e2a8 wait_task_zombie:... |
1339 1340 1341 1342 1343 1344 1345 |
/* 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... |
1346 |
if (!task_detached(p)) { |
2f4e6e2a8 wait_task_zombie:... |
1347 |
do_notify_parent(p, p->exit_signal); |
d839fd4d2 ptrace: introduce... |
1348 |
if (!task_detached(p)) { |
2f4e6e2a8 wait_task_zombie:... |
1349 1350 |
p->exit_state = EXIT_ZOMBIE; p = NULL; |
1da177e4c Linux-2.6.12-rc2 |
1351 1352 1353 1354 1355 1356 |
} } write_unlock_irq(&tasklist_lock); } if (p != NULL) release_task(p); |
2f4e6e2a8 wait_task_zombie:... |
1357 |
|
1da177e4c Linux-2.6.12-rc2 |
1358 1359 1360 1361 1362 1363 1364 1365 1366 |
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... |
1367 |
static int wait_task_stopped(int ptrace, struct task_struct *p, |
98abed020 do_wait reorganiz... |
1368 |
int options, struct siginfo __user *infop, |
1da177e4c Linux-2.6.12-rc2 |
1369 1370 |
int __user *stat_addr, struct rusage __user *ru) { |
ee7c82da8 wait_task_stopped... |
1371 1372 |
int retval, exit_code, why; uid_t uid = 0; /* unneeded, required by compiler */ |
c89507835 wait_task_stopped... |
1373 |
pid_t pid; |
1da177e4c Linux-2.6.12-rc2 |
1374 |
|
f470021ad ptrace children r... |
1375 |
if (!(options & WUNTRACED)) |
98abed020 do_wait reorganiz... |
1376 |
return 0; |
ee7c82da8 wait_task_stopped... |
1377 1378 1379 1380 1381 |
exit_code = 0; spin_lock_irq(&p->sighand->siglock); if (unlikely(!task_is_stopped_or_traced(p))) goto unlock_sig; |
f470021ad ptrace children r... |
1382 |
if (!ptrace && p->signal->group_stop_count > 0) |
1da177e4c Linux-2.6.12-rc2 |
1383 1384 1385 1386 |
/* * 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... |
1387 1388 1389 1390 1391 |
goto unlock_sig; exit_code = p->exit_code; if (!exit_code) goto unlock_sig; |
98abed020 do_wait reorganiz... |
1392 |
if (!unlikely(options & WNOWAIT)) |
ee7c82da8 wait_task_stopped... |
1393 1394 1395 1396 1397 1398 |
p->exit_code = 0; uid = p->uid; unlock_sig: spin_unlock_irq(&p->sighand->siglock); if (!exit_code) |
1da177e4c Linux-2.6.12-rc2 |
1399 1400 1401 1402 1403 1404 1405 1406 1407 1408 |
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 ... |
1409 |
pid = task_pid_vnr(p); |
f470021ad ptrace children r... |
1410 |
why = ptrace ? CLD_TRAPPED : CLD_STOPPED; |
1da177e4c Linux-2.6.12-rc2 |
1411 |
read_unlock(&tasklist_lock); |
98abed020 do_wait reorganiz... |
1412 |
if (unlikely(options & WNOWAIT)) |
1da177e4c Linux-2.6.12-rc2 |
1413 |
return wait_noreap_copyout(p, pid, uid, |
e6ceb32aa wait_task_stopped... |
1414 |
why, exit_code, |
1da177e4c Linux-2.6.12-rc2 |
1415 |
infop, ru); |
1da177e4c Linux-2.6.12-rc2 |
1416 1417 1418 1419 1420 1421 1422 1423 1424 |
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... |
1425 |
retval = put_user((short)why, &infop->si_code); |
1da177e4c Linux-2.6.12-rc2 |
1426 1427 1428 |
if (!retval && infop) retval = put_user(exit_code, &infop->si_status); if (!retval && infop) |
c89507835 wait_task_stopped... |
1429 |
retval = put_user(pid, &infop->si_pid); |
1da177e4c Linux-2.6.12-rc2 |
1430 |
if (!retval && infop) |
ee7c82da8 wait_task_stopped... |
1431 |
retval = put_user(uid, &infop->si_uid); |
1da177e4c Linux-2.6.12-rc2 |
1432 |
if (!retval) |
c89507835 wait_task_stopped... |
1433 |
retval = pid; |
1da177e4c Linux-2.6.12-rc2 |
1434 1435 1436 1437 1438 1439 1440 1441 1442 1443 1444 1445 |
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... |
1446 |
static int wait_task_continued(struct task_struct *p, int options, |
1da177e4c Linux-2.6.12-rc2 |
1447 1448 1449 1450 1451 1452 |
struct siginfo __user *infop, int __user *stat_addr, struct rusage __user *ru) { int retval; pid_t pid; uid_t uid; |
98abed020 do_wait reorganiz... |
1453 1454 |
if (!unlikely(options & WCONTINUED)) return 0; |
1da177e4c Linux-2.6.12-rc2 |
1455 1456 1457 1458 1459 1460 1461 1462 1463 |
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... |
1464 |
if (!unlikely(options & WNOWAIT)) |
1da177e4c Linux-2.6.12-rc2 |
1465 1466 |
p->signal->flags &= ~SIGNAL_STOP_CONTINUED; spin_unlock_irq(&p->sighand->siglock); |
6c5f3e7b4 Pidns: make full ... |
1467 |
pid = task_pid_vnr(p); |
1da177e4c Linux-2.6.12-rc2 |
1468 1469 1470 1471 1472 1473 1474 1475 1476 1477 |
uid = p->uid; 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... |
1478 |
retval = pid; |
1da177e4c Linux-2.6.12-rc2 |
1479 1480 1481 1482 1483 1484 1485 1486 1487 |
} else { retval = wait_noreap_copyout(p, pid, uid, CLD_CONTINUED, SIGCONT, infop, ru); BUG_ON(retval == 0); } return retval; } |
98abed020 do_wait reorganiz... |
1488 1489 1490 1491 1492 1493 |
/* * 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... |
1494 1495 |
* 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... |
1496 |
*/ |
f470021ad ptrace children r... |
1497 |
static int wait_consider_task(struct task_struct *parent, int ptrace, |
98abed020 do_wait reorganiz... |
1498 1499 1500 1501 1502 1503 |
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... |
1504 |
if (!ret) |
98abed020 do_wait reorganiz... |
1505 |
return ret; |
14dd0b814 do_wait: return s... |
1506 1507 1508 1509 1510 1511 1512 1513 1514 1515 1516 |
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... |
1517 1518 1519 1520 1521 1522 1523 1524 |
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... |
1525 1526 1527 1528 1529 1530 1531 1532 1533 1534 1535 1536 1537 1538 1539 1540 |
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... |
1541 1542 |
return wait_task_stopped(ptrace, p, options, infop, stat_addr, ru); |
98abed020 do_wait reorganiz... |
1543 1544 1545 1546 1547 1548 1549 1550 1551 1552 |
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... |
1553 1554 |
* *@notask_error is 0 if there were any eligible children, * or another error from security_task_wait(), or still -ECHILD. |
98abed020 do_wait reorganiz... |
1555 1556 1557 1558 1559 1560 1561 1562 1563 |
*/ 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... |
1564 1565 1566 1567 1568 1569 1570 1571 1572 1573 |
/* * 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... |
1574 1575 1576 1577 1578 1579 1580 1581 1582 1583 1584 1585 1586 |
} 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... |
1587 |
* Traditionally we see ptrace'd stopped tasks regardless of options. |
98abed020 do_wait reorganiz... |
1588 |
*/ |
f470021ad ptrace children r... |
1589 |
options |= WUNTRACED; |
98abed020 do_wait reorganiz... |
1590 |
|
f470021ad ptrace children r... |
1591 1592 1593 1594 1595 |
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... |
1596 |
return ret; |
98abed020 do_wait reorganiz... |
1597 1598 1599 1600 |
} return 0; } |
161550d74 pid: sys_wait... ... |
1601 1602 1603 |
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 |
1604 1605 1606 |
{ DECLARE_WAITQUEUE(wait, current); struct task_struct *tsk; |
98abed020 do_wait reorganiz... |
1607 |
int retval; |
1da177e4c Linux-2.6.12-rc2 |
1608 1609 1610 |
add_wait_queue(¤t->signal->wait_chldexit,&wait); repeat: |
98abed020 do_wait reorganiz... |
1611 1612 1613 1614 1615 |
/* * 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... ... |
1616 1617 1618 |
retval = -ECHILD; if ((type < PIDTYPE_MAX) && (!pid || hlist_empty(&pid->tasks[type]))) goto end; |
1da177e4c Linux-2.6.12-rc2 |
1619 1620 1621 1622 |
current->state = TASK_INTERRUPTIBLE; read_lock(&tasklist_lock); tsk = current; do { |
98abed020 do_wait reorganiz... |
1623 1624 1625 1626 1627 1628 1629 1630 1631 1632 1633 1634 1635 |
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 |
1636 |
} |
98abed020 do_wait reorganiz... |
1637 |
|
1da177e4c Linux-2.6.12-rc2 |
1638 1639 1640 |
if (options & __WNOTHREAD) break; tsk = next_thread(tsk); |
125e18745 [PATCH] More BUG_... |
1641 |
BUG_ON(tsk->signal != current->signal); |
1da177e4c Linux-2.6.12-rc2 |
1642 |
} while (tsk != current); |
1da177e4c Linux-2.6.12-rc2 |
1643 |
read_unlock(&tasklist_lock); |
f2cc3eb13 do_wait: fix secu... |
1644 |
|
98abed020 do_wait reorganiz... |
1645 |
if (!retval && !(options & WNOHANG)) { |
1da177e4c Linux-2.6.12-rc2 |
1646 |
retval = -ERESTARTSYS; |
98abed020 do_wait reorganiz... |
1647 1648 1649 1650 |
if (!signal_pending(current)) { schedule(); goto repeat; } |
1da177e4c Linux-2.6.12-rc2 |
1651 |
} |
98abed020 do_wait reorganiz... |
1652 |
|
1da177e4c Linux-2.6.12-rc2 |
1653 1654 1655 1656 1657 |
end: current->state = TASK_RUNNING; remove_wait_queue(¤t->signal->wait_chldexit,&wait); if (infop) { if (retval > 0) |
9cbab8100 do_wait: factor o... |
1658 |
retval = 0; |
1da177e4c Linux-2.6.12-rc2 |
1659 1660 1661 1662 1663 1664 1665 1666 1667 1668 1669 1670 1671 1672 1673 1674 1675 1676 1677 1678 1679 1680 |
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... ... |
1681 |
asmlinkage long sys_waitid(int which, pid_t upid, |
1da177e4c Linux-2.6.12-rc2 |
1682 1683 1684 |
struct siginfo __user *infop, int options, struct rusage __user *ru) { |
161550d74 pid: sys_wait... ... |
1685 1686 |
struct pid *pid = NULL; enum pid_type type; |
1da177e4c Linux-2.6.12-rc2 |
1687 1688 1689 1690 1691 1692 1693 1694 1695 |
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... ... |
1696 |
type = PIDTYPE_MAX; |
1da177e4c Linux-2.6.12-rc2 |
1697 1698 |
break; case P_PID: |
161550d74 pid: sys_wait... ... |
1699 1700 |
type = PIDTYPE_PID; if (upid <= 0) |
1da177e4c Linux-2.6.12-rc2 |
1701 1702 1703 |
return -EINVAL; break; case P_PGID: |
161550d74 pid: sys_wait... ... |
1704 1705 |
type = PIDTYPE_PGID; if (upid <= 0) |
1da177e4c Linux-2.6.12-rc2 |
1706 |
return -EINVAL; |
1da177e4c Linux-2.6.12-rc2 |
1707 1708 1709 1710 |
break; default: return -EINVAL; } |
161550d74 pid: sys_wait... ... |
1711 1712 1713 1714 |
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 |
1715 1716 |
/* avoid REGPARM breakage on x86: */ |
54a015104 asmlinkage_protec... |
1717 |
asmlinkage_protect(5, ret, which, upid, infop, options, ru); |
1da177e4c Linux-2.6.12-rc2 |
1718 1719 |
return ret; } |
161550d74 pid: sys_wait... ... |
1720 |
asmlinkage long sys_wait4(pid_t upid, int __user *stat_addr, |
1da177e4c Linux-2.6.12-rc2 |
1721 1722 |
int options, struct rusage __user *ru) { |
161550d74 pid: sys_wait... ... |
1723 1724 |
struct pid *pid = NULL; enum pid_type type; |
1da177e4c Linux-2.6.12-rc2 |
1725 1726 1727 1728 1729 |
long ret; if (options & ~(WNOHANG|WUNTRACED|WCONTINUED| __WNOTHREAD|__WCLONE|__WALL)) return -EINVAL; |
161550d74 pid: sys_wait... ... |
1730 1731 1732 1733 1734 1735 1736 1737 1738 1739 1740 1741 1742 1743 1744 1745 |
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 |
1746 1747 |
/* avoid REGPARM breakage on x86: */ |
54a015104 asmlinkage_protec... |
1748 |
asmlinkage_protect(4, ret, upid, stat_addr, options, ru); |
1da177e4c Linux-2.6.12-rc2 |
1749 1750 1751 1752 1753 1754 1755 1756 1757 1758 1759 1760 1761 1762 1763 |
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 |