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2d602bf283
In 'struct acct', 'struct acct_v3', and 'struct taskstats' we have a 32-bit 'ac_btime' field containing an absolute time value, which will overflow in year 2106. There are two possible ways to deal with it: a) let it overflow and have user space code deal with reconstructing the data based on the current time, or b) truncate the times based on the range of the u32 type. Neither of them solves the actual problem. Pick the second one to best document what the issue is, and have someone fix it in a future version. Signed-off-by: Arnd Bergmann <arnd@arndb.de>
127 lines
3.9 KiB
C
127 lines
3.9 KiB
C
/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
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/*
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* BSD Process Accounting for Linux - Definitions
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*
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* Author: Marco van Wieringen (mvw@planets.elm.net)
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*
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* This header file contains the definitions needed to implement
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* BSD-style process accounting. The kernel accounting code and all
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* user-level programs that try to do something useful with the
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* process accounting log must include this file.
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*
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* Copyright (C) 1995 - 1997 Marco van Wieringen - ELM Consultancy B.V.
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*
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*/
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#ifndef _UAPI_LINUX_ACCT_H
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#define _UAPI_LINUX_ACCT_H
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#include <linux/types.h>
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#include <asm/param.h>
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#include <asm/byteorder.h>
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/*
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* comp_t is a 16-bit "floating" point number with a 3-bit base 8
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* exponent and a 13-bit fraction.
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* comp2_t is 24-bit with 5-bit base 2 exponent and 20 bit fraction
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* (leading 1 not stored).
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* See linux/kernel/acct.c for the specific encoding systems used.
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*/
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typedef __u16 comp_t;
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typedef __u32 comp2_t;
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/*
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* accounting file record
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*
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* This structure contains all of the information written out to the
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* process accounting file whenever a process exits.
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*/
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#define ACCT_COMM 16
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struct acct
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{
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char ac_flag; /* Flags */
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char ac_version; /* Always set to ACCT_VERSION */
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/* for binary compatibility back until 2.0 */
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__u16 ac_uid16; /* LSB of Real User ID */
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__u16 ac_gid16; /* LSB of Real Group ID */
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__u16 ac_tty; /* Control Terminal */
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/* __u32 range means times from 1970 to 2106 */
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__u32 ac_btime; /* Process Creation Time */
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comp_t ac_utime; /* User Time */
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comp_t ac_stime; /* System Time */
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comp_t ac_etime; /* Elapsed Time */
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comp_t ac_mem; /* Average Memory Usage */
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comp_t ac_io; /* Chars Transferred */
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comp_t ac_rw; /* Blocks Read or Written */
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comp_t ac_minflt; /* Minor Pagefaults */
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comp_t ac_majflt; /* Major Pagefaults */
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comp_t ac_swaps; /* Number of Swaps */
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/* m68k had no padding here. */
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#if !defined(CONFIG_M68K) || !defined(__KERNEL__)
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__u16 ac_ahz; /* AHZ */
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#endif
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__u32 ac_exitcode; /* Exitcode */
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char ac_comm[ACCT_COMM + 1]; /* Command Name */
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__u8 ac_etime_hi; /* Elapsed Time MSB */
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__u16 ac_etime_lo; /* Elapsed Time LSB */
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__u32 ac_uid; /* Real User ID */
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__u32 ac_gid; /* Real Group ID */
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};
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struct acct_v3
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{
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char ac_flag; /* Flags */
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char ac_version; /* Always set to ACCT_VERSION */
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__u16 ac_tty; /* Control Terminal */
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__u32 ac_exitcode; /* Exitcode */
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__u32 ac_uid; /* Real User ID */
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__u32 ac_gid; /* Real Group ID */
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__u32 ac_pid; /* Process ID */
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__u32 ac_ppid; /* Parent Process ID */
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/* __u32 range means times from 1970 to 2106 */
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__u32 ac_btime; /* Process Creation Time */
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#ifdef __KERNEL__
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__u32 ac_etime; /* Elapsed Time */
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#else
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float ac_etime; /* Elapsed Time */
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#endif
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comp_t ac_utime; /* User Time */
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comp_t ac_stime; /* System Time */
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comp_t ac_mem; /* Average Memory Usage */
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comp_t ac_io; /* Chars Transferred */
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comp_t ac_rw; /* Blocks Read or Written */
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comp_t ac_minflt; /* Minor Pagefaults */
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comp_t ac_majflt; /* Major Pagefaults */
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comp_t ac_swaps; /* Number of Swaps */
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char ac_comm[ACCT_COMM]; /* Command Name */
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};
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/*
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* accounting flags
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*/
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/* bit set when the process ... */
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#define AFORK 0x01 /* ... executed fork, but did not exec */
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#define ASU 0x02 /* ... used super-user privileges */
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#define ACOMPAT 0x04 /* ... used compatibility mode (VAX only not used) */
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#define ACORE 0x08 /* ... dumped core */
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#define AXSIG 0x10 /* ... was killed by a signal */
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#if defined(__BYTE_ORDER) ? __BYTE_ORDER == __BIG_ENDIAN : defined(__BIG_ENDIAN)
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#define ACCT_BYTEORDER 0x80 /* accounting file is big endian */
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#elif defined(__BYTE_ORDER) ? __BYTE_ORDER == __LITTLE_ENDIAN : defined(__LITTLE_ENDIAN)
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#define ACCT_BYTEORDER 0x00 /* accounting file is little endian */
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#else
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#error unspecified endianness
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#endif
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#ifndef __KERNEL__
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#define ACCT_VERSION 2
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#define AHZ (HZ)
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#endif /* __KERNEL */
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#endif /* _UAPI_LINUX_ACCT_H */
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