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The C and C++ Include Header Files

/usr/include/linux/acct.h


$ cat -n /usr/include/linux/acct.h

     1	/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
     2	/*
     3	 *  BSD Process Accounting for Linux - Definitions
     4	 *
     5	 *  Author: Marco van Wieringen (mvw@planets.elm.net)
     6	 *
     7	 *  This header file contains the definitions needed to implement
     8	 *  BSD-style process accounting. The kernel accounting code and all
     9	 *  user-level programs that try to do something useful with the
    10	 *  process accounting log must include this file.
    11	 *
    12	 *  Copyright (C) 1995 - 1997 Marco van Wieringen - ELM Consultancy B.V.
    13	 *
    14	 */
    15	
    16	#ifndef _LINUX_ACCT_H
    17	#define _LINUX_ACCT_H
    18	
    19	#include <linux/types.h>
    20	
    21	#include <asm/param.h>
    22	#include <asm/byteorder.h>
    23	
    24	/* 
    25	 *  comp_t is a 16-bit "floating" point number with a 3-bit base 8
    26	 *  exponent and a 13-bit fraction.
    27	 *  comp2_t is 24-bit with 5-bit base 2 exponent and 20 bit fraction
    28	 *  (leading 1 not stored).
    29	 *  See linux/kernel/acct.c for the specific encoding systems used.
    30	 */
    31	
    32	typedef __u16	comp_t;
    33	typedef __u32	comp2_t;
    34	
    35	/*
    36	 *   accounting file record
    37	 *
    38	 *   This structure contains all of the information written out to the
    39	 *   process accounting file whenever a process exits.
    40	 */
    41	
    42	#define ACCT_COMM	16
    43	
    44	struct acct
    45	{
    46		char		ac_flag;		/* Flags */
    47		char		ac_version;		/* Always set to ACCT_VERSION */
    48		/* for binary compatibility back until 2.0 */
    49		__u16		ac_uid16;		/* LSB of Real User ID */
    50		__u16		ac_gid16;		/* LSB of Real Group ID */
    51		__u16		ac_tty;			/* Control Terminal */
    52		/* __u32 range means times from 1970 to 2106 */
    53		__u32		ac_btime;		/* Process Creation Time */
    54		comp_t		ac_utime;		/* User Time */
    55		comp_t		ac_stime;		/* System Time */
    56		comp_t		ac_etime;		/* Elapsed Time */
    57		comp_t		ac_mem;			/* Average Memory Usage */
    58		comp_t		ac_io;			/* Chars Transferred */
    59		comp_t		ac_rw;			/* Blocks Read or Written */
    60		comp_t		ac_minflt;		/* Minor Pagefaults */
    61		comp_t		ac_majflt;		/* Major Pagefaults */
    62		comp_t		ac_swaps;		/* Number of Swaps */
    63	/* m68k had no padding here. */
    64		__u16		ac_ahz;			/* AHZ */
    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 range means times from 1970 to 2106 */
    84		__u32		ac_btime;		/* Process Creation Time */
    85		float		ac_etime;		/* Elapsed Time */
    86		comp_t		ac_utime;		/* User Time */
    87		comp_t		ac_stime;		/* System Time */
    88		comp_t		ac_mem;			/* Average Memory Usage */
    89		comp_t		ac_io;			/* Chars Transferred */
    90		comp_t		ac_rw;			/* Blocks Read or Written */
    91		comp_t		ac_minflt;		/* Minor Pagefaults */
    92		comp_t		ac_majflt;		/* Major Pagefaults */
    93		comp_t		ac_swaps;		/* Number of Swaps */
    94		char		ac_comm[ACCT_COMM];	/* Command Name */
    95	};
    96	
    97	/*
    98	 *  accounting flags
    99	 */
   100					/* bit set when the process/task ... */
   101	#define AFORK		0x01	/* ... executed fork, but did not exec */
   102	#define ASU		0x02	/* ... used super-user privileges */
   103	#define ACOMPAT		0x04	/* ... used compatibility mode (VAX only not used) */
   104	#define ACORE		0x08	/* ... dumped core */
   105	#define AXSIG		0x10	/* ... was killed by a signal */
   106	#define AGROUP		0x20	/* ... was the last task of the process (task group) */
   107	
   108	#if defined(__BYTE_ORDER) ? __BYTE_ORDER == __BIG_ENDIAN : defined(__BIG_ENDIAN)
   109	#define ACCT_BYTEORDER	0x80	/* accounting file is big endian */
   110	#elif defined(__BYTE_ORDER) ? __BYTE_ORDER == __LITTLE_ENDIAN : defined(__LITTLE_ENDIAN)
   111	#define ACCT_BYTEORDER	0x00	/* accounting file is little endian */
   112	#else
   113	#error unspecified endianness
   114	#endif
   115	
   116	#define ACCT_VERSION	2
   117	#define AHZ		(HZ)
   118	
   119	
   120	#endif /* _LINUX_ACCT_H */