linux/include/linux/acct.h
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   1/*
   2 *  BSD Process Accounting for Linux - Definitions
   3 *
   4 *  Author: Marco van Wieringen (mvw@planets.elm.net)
   5 *
   6 *  This header file contains the definitions needed to implement
   7 *  BSD-style process accounting. The kernel accounting code and all
   8 *  user-level programs that try to do something useful with the
   9 *  process accounting log must include this file.
  10 *
  11 *  Copyright (C) 1995 - 1997 Marco van Wieringen - ELM Consultancy B.V.
  12 *
  13 */
  14
  15#ifndef _LINUX_ACCT_H
  16#define _LINUX_ACCT_H
  17
  18#include <linux/types.h>
  19
  20#include <asm/param.h>
  21#include <asm/byteorder.h>
  22
  23/* 
  24 *  comp_t is a 16-bit "floating" point number with a 3-bit base 8
  25 *  exponent and a 13-bit fraction.
  26 *  comp2_t is 24-bit with 5-bit base 2 exponent and 20 bit fraction
  27 *  (leading 1 not stored).
  28 *  See linux/kernel/acct.c for the specific encoding systems used.
  29 */
  30
  31typedef __u16   comp_t;
  32typedef __u32   comp2_t;
  33
  34/*
  35 *   accounting file record
  36 *
  37 *   This structure contains all of the information written out to the
  38 *   process accounting file whenever a process exits.
  39 */
  40
  41#define ACCT_COMM       16
  42
  43struct acct
  44{
  45        char            ac_flag;                /* Flags */
  46        char            ac_version;             /* Always set to ACCT_VERSION */
  47        /* for binary compatibility back until 2.0 */
  48        __u16           ac_uid16;               /* LSB of Real User ID */
  49        __u16           ac_gid16;               /* LSB of Real Group ID */
  50        __u16           ac_tty;                 /* Control Terminal */
  51        __u32           ac_btime;               /* Process Creation Time */
  52        comp_t          ac_utime;               /* User Time */
  53        comp_t          ac_stime;               /* System Time */
  54        comp_t          ac_etime;               /* Elapsed Time */
  55        comp_t          ac_mem;                 /* Average Memory Usage */
  56        comp_t          ac_io;                  /* Chars Transferred */
  57        comp_t          ac_rw;                  /* Blocks Read or Written */
  58        comp_t          ac_minflt;              /* Minor Pagefaults */
  59        comp_t          ac_majflt;              /* Major Pagefaults */
  60        comp_t          ac_swaps;               /* Number of Swaps */
  61/* m68k had no padding here. */
  62#if !defined(CONFIG_M68K) || !defined(__KERNEL__)
  63        __u16           ac_ahz;                 /* AHZ */
  64#endif
  65        __u32           ac_exitcode;            /* Exitcode */
  66        char            ac_comm[ACCT_COMM + 1]; /* Command Name */
  67        __u8            ac_etime_hi;            /* Elapsed Time MSB */
  68        __u16           ac_etime_lo;            /* Elapsed Time LSB */
  69        __u32           ac_uid;                 /* Real User ID */
  70        __u32           ac_gid;                 /* Real Group ID */
  71};
  72
  73struct acct_v3
  74{
  75        char            ac_flag;                /* Flags */
  76        char            ac_version;             /* Always set to ACCT_VERSION */
  77        __u16           ac_tty;                 /* Control Terminal */
  78        __u32           ac_exitcode;            /* Exitcode */
  79        __u32           ac_uid;                 /* Real User ID */
  80        __u32           ac_gid;                 /* Real Group ID */
  81        __u32           ac_pid;                 /* Process ID */
  82        __u32           ac_ppid;                /* Parent Process ID */
  83        __u32           ac_btime;               /* Process Creation Time */
  84#ifdef __KERNEL__
  85        __u32           ac_etime;               /* Elapsed Time */
  86#else
  87        float           ac_etime;               /* Elapsed Time */
  88#endif
  89        comp_t          ac_utime;               /* User Time */
  90        comp_t          ac_stime;               /* System Time */
  91        comp_t          ac_mem;                 /* Average Memory Usage */
  92        comp_t          ac_io;                  /* Chars Transferred */
  93        comp_t          ac_rw;                  /* Blocks Read or Written */
  94        comp_t          ac_minflt;              /* Minor Pagefaults */
  95        comp_t          ac_majflt;              /* Major Pagefaults */
  96        comp_t          ac_swaps;               /* Number of Swaps */
  97        char            ac_comm[ACCT_COMM];     /* Command Name */
  98};
  99
 100/*
 101 *  accounting flags
 102 */
 103                                /* bit set when the process ... */
 104#define AFORK           0x01    /* ... executed fork, but did not exec */
 105#define ASU             0x02    /* ... used super-user privileges */
 106#define ACOMPAT         0x04    /* ... used compatibility mode (VAX only not used) */
 107#define ACORE           0x08    /* ... dumped core */
 108#define AXSIG           0x10    /* ... was killed by a signal */
 109
 110#ifdef __BIG_ENDIAN
 111#define ACCT_BYTEORDER  0x80    /* accounting file is big endian */
 112#else
 113#define ACCT_BYTEORDER  0x00    /* accounting file is little endian */
 114#endif
 115
 116#ifdef __KERNEL__
 117
 118
 119#ifdef CONFIG_BSD_PROCESS_ACCT
 120struct vfsmount;
 121struct super_block;
 122struct pacct_struct;
 123struct pid_namespace;
 124extern int acct_parm[]; /* for sysctl */
 125extern void acct_auto_close_mnt(struct vfsmount *m);
 126extern void acct_auto_close(struct super_block *sb);
 127extern void acct_collect(long exitcode, int group_dead);
 128extern void acct_process(void);
 129extern void acct_exit_ns(struct pid_namespace *);
 130#else
 131#define acct_auto_close_mnt(x)  do { } while (0)
 132#define acct_auto_close(x)      do { } while (0)
 133#define acct_collect(x,y)       do { } while (0)
 134#define acct_process()          do { } while (0)
 135#define acct_exit_ns(ns)        do { } while (0)
 136#endif
 137
 138/*
 139 * ACCT_VERSION numbers as yet defined:
 140 * 0: old format (until 2.6.7) with 16 bit uid/gid
 141 * 1: extended variant (binary compatible on M68K)
 142 * 2: extended variant (binary compatible on everything except M68K)
 143 * 3: new binary incompatible format (64 bytes)
 144 * 4: new binary incompatible format (128 bytes)
 145 * 5: new binary incompatible format (128 bytes, second half)
 146 *
 147 */
 148
 149#undef ACCT_VERSION
 150#undef AHZ
 151
 152#ifdef CONFIG_BSD_PROCESS_ACCT_V3
 153#define ACCT_VERSION    3
 154#define AHZ             100
 155typedef struct acct_v3 acct_t;
 156#else
 157#ifdef CONFIG_M68K
 158#define ACCT_VERSION    1
 159#else
 160#define ACCT_VERSION    2
 161#endif
 162#define AHZ             (USER_HZ)
 163typedef struct acct acct_t;
 164#endif
 165
 166#else
 167#define ACCT_VERSION    2
 168#define AHZ             (HZ)
 169#endif  /* __KERNEL */
 170
 171#ifdef __KERNEL__
 172#include <linux/jiffies.h>
 173/*
 174 * Yet another set of HZ to *HZ helper functions.
 175 * See <linux/jiffies.h> for the original.
 176 */
 177
 178static inline u32 jiffies_to_AHZ(unsigned long x)
 179{
 180#if (TICK_NSEC % (NSEC_PER_SEC / AHZ)) == 0
 181# if HZ < AHZ
 182        return x * (AHZ / HZ);
 183# else
 184        return x / (HZ / AHZ);
 185# endif
 186#else
 187        u64 tmp = (u64)x * TICK_NSEC;
 188        do_div(tmp, (NSEC_PER_SEC / AHZ));
 189        return (long)tmp;
 190#endif
 191}
 192
 193static inline u64 nsec_to_AHZ(u64 x)
 194{
 195#if (NSEC_PER_SEC % AHZ) == 0
 196        do_div(x, (NSEC_PER_SEC / AHZ));
 197#elif (AHZ % 512) == 0
 198        x *= AHZ/512;
 199        do_div(x, (NSEC_PER_SEC / 512));
 200#else
 201        /*
 202         * max relative error 5.7e-8 (1.8s per year) for AHZ <= 1024,
 203         * overflow after 64.99 years.
 204         * exact for AHZ=60, 72, 90, 120, 144, 180, 300, 600, 900, ...
 205         */
 206        x *= 9;
 207        do_div(x, (unsigned long)((9ull * NSEC_PER_SEC + (AHZ/2))
 208                                  / AHZ));
 209#endif
 210        return x;
 211}
 212
 213#endif  /* __KERNEL */
 214
 215#endif  /* _LINUX_ACCT_H */
 216
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