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
  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
  31 typedef __u16   comp_t;
  32 typedef __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
  43 struct 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
  73 struct 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
 120 struct vfsmount;
 121 struct super_block;
 122 extern void acct_auto_close_mnt(struct vfsmount *m);
 123 extern void acct_auto_close(struct super_block *sb);
 124 extern void acct_init_pacct(struct pacct_struct *pacct);
 125 extern void acct_collect(long exitcode, int group_dead);
 126 extern void acct_process(void);
 127 #else
 128 #define acct_auto_close_mnt(x)  do { } while (0)
 129 #define acct_auto_close(x)      do { } while (0)
 130 #define acct_init_pacct(x)      do { } while (0)
 131 #define acct_collect(x,y)       do { } while (0)
 132 #define acct_process()          do { } while (0)
 133 #endif
 134
 135 /*
 136  * ACCT_VERSION numbers as yet defined:
 137  * 0: old format (until 2.6.7) with 16 bit uid/gid
 138  * 1: extended variant (binary compatible on M68K)
 139  * 2: extended variant (binary compatible on everything except M68K)
 140  * 3: new binary incompatible format (64 bytes)
 141  * 4: new binary incompatible format (128 bytes)
 142  * 5: new binary incompatible format (128 bytes, second half)
 143  *
 144  */
 145
 146 #ifdef CONFIG_BSD_PROCESS_ACCT_V3
 147 #define ACCT_VERSION    3
 148 #define AHZ             100
 149 typedef struct acct_v3 acct_t;
 150 #else
 151 #ifdef CONFIG_M68K
 152 #define ACCT_VERSION    1
 153 #else
 154 #define ACCT_VERSION    2
 155 #endif
 156 #define AHZ             (USER_HZ)
 157 typedef struct acct acct_t;
 158 #endif
 159
 160 #else
 161 #define ACCT_VERSION    2
 162 #define AHZ             (HZ)
 163 #endif  /* __KERNEL */
 164
 165 #ifdef __KERNEL__
 166 #include <linux/jiffies.h>
 167 /*
 168  * Yet another set of HZ to *HZ helper functions.
 169  * See <linux/jiffies.h> for the original.
 170  */
 171
 172 static inline u32 jiffies_to_AHZ(unsigned long x)
 173 {
 174 #if (TICK_NSEC % (NSEC_PER_SEC / AHZ)) == 0
 175         return x / (HZ / AHZ);
 176 #else
 177         u64 tmp = (u64)x * TICK_NSEC;
 178         do_div(tmp, (NSEC_PER_SEC / AHZ));
 179         return (long)tmp;
 180 #endif
 181 }
 182
 183 static inline u64 nsec_to_AHZ(u64 x)
 184 {
 185 #if (NSEC_PER_SEC % AHZ) == 0
 186         do_div(x, (NSEC_PER_SEC / AHZ));
 187 #elif (AHZ % 512) == 0
 188         x *= AHZ/512;
 189         do_div(x, (NSEC_PER_SEC / 512));
 190 #else
 191         /*
 192          * max relative error 5.7e-8 (1.8s per year) for AHZ <= 1024,
 193          * overflow after 64.99 years.
 194          * exact for AHZ=60, 72, 90, 120, 144, 180, 300, 600, 900, ...
 195          */
 196         x *= 9;
 197         do_div(x, (unsigned long)((9ull * NSEC_PER_SEC + (AHZ/2))
 198                                   / AHZ));
 199 #endif
 200         return x;
 201 }
 202
 203 #endif  /* __KERNEL */
 204
 205 #endif  /* _LINUX_ACCT_H */