include/linux/acct.h

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