include/uapi/linux/acct.h

Source file repositories/reference/linux-study-clean/include/uapi/linux/acct.h

File Facts

System
Linux kernel
Corpus path
include/uapi/linux/acct.h
Extension
.h
Size
4095 bytes
Lines
129
Domain
Core OS
Bucket
Core Kernel Interface
Inferred role
Core OS: implementation source
Status
source implementation candidate

Why This File Exists

Core operating-system implementation surface: boot, tasks, memory, VFS, syscall-facing interfaces, synchronization, credentials, and isolation.

Dependency Surface

Detected Declarations

Annotated Snippet

#ifndef _UAPI_LINUX_ACCT_H
#define _UAPI_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 range means times from 1970 to 2106 */
	__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 range means times from 1970 to 2106 */
	__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
 */

Annotation

Implementation Notes