/*
   *  BSD Process Accounting for Linux - Definitions
   *
   *  Author: Marco van Wieringen (mvw@planets.elm.net)
   *
   *  This header file contains the definitions needed to implement
   *  BSD-style process accounting. The kernel accounting code and all
   *  user-level programs that try to do something useful with the
   *  process accounting log must include this file.
   *
   *  Copyright (C) 1995 - 1997 Marco van Wieringen - ELM Consultancy B.V.
   *
   */
  
  #ifndef _LINUX_ACCT_H
  #define _LINUX_ACCT_H
  
  #include <linux/types.h>

  #include <asm/param.h>
  #include <asm/byteorder.h>
  
  /* 
   *  comp_t is a 16-bit "floating" point number with a 3-bit base 8
   *  exponent and a 13-bit fraction.
   *  comp2_t is 24-bit with 5-bit base 2 exponent and 20 bit fraction
   *  (leading 1 not stored).
   *  See linux/kernel/acct.c for the specific encoding systems used.
   */
  
  typedef __u16	comp_t;
  typedef __u32	comp2_t;
  
  /*
   *   accounting file record
   *
   *   This structure contains all of the information written out to the
   *   process accounting file whenever a process exits.
   */
  
  #define ACCT_COMM	16
  
  struct acct
  {
  	char		ac_flag;		/* Flags */
  	char		ac_version;		/* Always set to ACCT_VERSION */
  	/* for binary compatibility back until 2.0 */
  	__u16		ac_uid16;		/* LSB of Real User ID */
  	__u16		ac_gid16;		/* LSB of Real Group ID */
  	__u16		ac_tty;			/* Control Terminal */
  	__u32		ac_btime;		/* Process Creation Time */
  	comp_t		ac_utime;		/* User Time */
  	comp_t		ac_stime;		/* System Time */
  	comp_t		ac_etime;		/* Elapsed Time */
  	comp_t		ac_mem;			/* Average Memory Usage */
  	comp_t		ac_io;			/* Chars Transferred */
  	comp_t		ac_rw;			/* Blocks Read or Written */
  	comp_t		ac_minflt;		/* Minor Pagefaults */
  	comp_t		ac_majflt;		/* Major Pagefaults */
  	comp_t		ac_swaps;		/* Number of Swaps */
  /* m68k had no padding here. */
  #if !defined(CONFIG_M68K) || !defined(__KERNEL__)
  	__u16		ac_ahz;			/* AHZ */
  #endif
  	__u32		ac_exitcode;		/* Exitcode */
  	char		ac_comm[ACCT_COMM + 1];	/* Command Name */
  	__u8		ac_etime_hi;		/* Elapsed Time MSB */
  	__u16		ac_etime_lo;		/* Elapsed Time LSB */
  	__u32		ac_uid;			/* Real User ID */
  	__u32		ac_gid;			/* Real Group ID */
  };
  
  struct acct_v3
  {
  	char		ac_flag;		/* Flags */
  	char		ac_version;		/* Always set to ACCT_VERSION */
  	__u16		ac_tty;			/* Control Terminal */
  	__u32		ac_exitcode;		/* Exitcode */
  	__u32		ac_uid;			/* Real User ID */
  	__u32		ac_gid;			/* Real Group ID */
  	__u32		ac_pid;			/* Process ID */
  	__u32		ac_ppid;		/* Parent Process ID */
  	__u32		ac_btime;		/* Process Creation Time */
  #ifdef __KERNEL__
  	__u32		ac_etime;		/* Elapsed Time */
  #else
  	float		ac_etime;		/* Elapsed Time */
  #endif
  	comp_t		ac_utime;		/* User Time */
  	comp_t		ac_stime;		/* System Time */
  	comp_t		ac_mem;			/* Average Memory Usage */
  	comp_t		ac_io;			/* Chars Transferred */
  	comp_t		ac_rw;			/* Blocks Read or Written */
  	comp_t		ac_minflt;		/* Minor Pagefaults */
  	comp_t		ac_majflt;		/* Major Pagefaults */
  	comp_t		ac_swaps;		/* Number of Swaps */
  	char		ac_comm[ACCT_COMM];	/* Command Name */
  };
  
  /*
   *  accounting flags
   */
  				/* bit set when the process ... */
  #define AFORK		0x01	/* ... executed fork, but did not exec */
  #define ASU		0x02	/* ... used super-user privileges */
  #define ACOMPAT		0x04	/* ... used compatibility mode (VAX only not used) */
  #define ACORE		0x08	/* ... dumped core */
  #define AXSIG		0x10	/* ... was killed by a signal */
  
  #ifdef __BIG_ENDIAN
  #define ACCT_BYTEORDER	0x80	/* accounting file is big endian */
  #else
  #define ACCT_BYTEORDER	0x00	/* accounting file is little endian */
  #endif
  
  #ifdef __KERNEL__

  
  #ifdef CONFIG_BSD_PROCESS_ACCT

  struct vfsmount;

  struct super_block;

  struct pacct_struct;

  struct pid_namespace;

  extern int acct_parm[]; /* for sysctl */

  extern void acct_auto_close_mnt(struct vfsmount *m);

  extern void acct_auto_close(struct super_block *sb);

  extern void acct_collect(long exitcode, int group_dead);
  extern void acct_process(void);

  extern void acct_exit_ns(struct pid_namespace *);

  #else

  #define acct_auto_close_mnt(x)	do { } while (0)

  #define acct_auto_close(x)	do { } while (0)

  #define acct_collect(x,y)	do { } while (0)
  #define acct_process()		do { } while (0)

  #define acct_exit_ns(ns)	do { } while (0)

  #endif
  
  /*
   * ACCT_VERSION numbers as yet defined:
   * 0: old format (until 2.6.7) with 16 bit uid/gid
   * 1: extended variant (binary compatible on M68K)
   * 2: extended variant (binary compatible on everything except M68K)
   * 3: new binary incompatible format (64 bytes)
   * 4: new binary incompatible format (128 bytes)
   * 5: new binary incompatible format (128 bytes, second half)
   *
   */
  
  #ifdef CONFIG_BSD_PROCESS_ACCT_V3
  #define ACCT_VERSION	3
  #define AHZ		100
  typedef struct acct_v3 acct_t;
  #else
  #ifdef CONFIG_M68K
  #define ACCT_VERSION	1
  #else
  #define ACCT_VERSION	2
  #endif
  #define AHZ		(USER_HZ)
  typedef struct acct acct_t;
  #endif
  
  #else
  #define ACCT_VERSION	2
  #define AHZ		(HZ)
  #endif	/* __KERNEL */
  
  #ifdef __KERNEL__

  #include <linux/jiffies.h>

  /*
   * Yet another set of HZ to *HZ helper functions.

   * See <linux/jiffies.h> for the original.

   */
  
  static inline u32 jiffies_to_AHZ(unsigned long x)
  {
  #if (TICK_NSEC % (NSEC_PER_SEC / AHZ)) == 0

  # if HZ < AHZ
  	return x * (AHZ / HZ);
  # else

  	return x / (HZ / AHZ);

  # endif

  #else
          u64 tmp = (u64)x * TICK_NSEC;
          do_div(tmp, (NSEC_PER_SEC / AHZ));
          return (long)tmp;
  #endif
  }
  
  static inline u64 nsec_to_AHZ(u64 x)
  {
  #if (NSEC_PER_SEC % AHZ) == 0
  	do_div(x, (NSEC_PER_SEC / AHZ));
  #elif (AHZ % 512) == 0
  	x *= AHZ/512;
  	do_div(x, (NSEC_PER_SEC / 512));
  #else
  	/*
           * max relative error 5.7e-8 (1.8s per year) for AHZ <= 1024,
           * overflow after 64.99 years.
           * exact for AHZ=60, 72, 90, 120, 144, 180, 300, 600, 900, ...
           */
  	x *= 9;
  	do_div(x, (unsigned long)((9ull * NSEC_PER_SEC + (AHZ/2))
  	                          / AHZ));
  #endif
  	return x;
  }
  
  #endif  /* __KERNEL */
  
  #endif	/* _LINUX_ACCT_H */