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729f34028a
After my patch to move SHMLBA to its own header, the bits/shm.h headers for architectures using the Linux kernel still vary in a few ways: the use of __syscall_ulong_t; whether padding for 32-bit systems is present before or after time fields, or missing altogether (mips, x32); whether shm_segsz is before or after the time fields; whether, if after time fields, there is extra padding before shm_segsz. This patch arranges for a single header to be used. __syscall_ulong_t is safe to use everywhere, while bits/shm-pad.h is added with new macros __SHM_PAD_AFTER_TIME, __SHM_PAD_BEFORE_TIME, __SHM_SEGSZ_AFTER_TIME and __SHM_PAD_BETWEEN_TIME_AND_SEGSZ to describe the differences. Tested for x86_64 and x86, and with build-many-glibcs.py. * sysdeps/unix/sysv/linux/Makefile (sysdep_headers): Add bits/shm-pad.h. * sysdeps/unix/sysv/linux/bits/shm.h: Include <bits/shm-pad.h>. (shmatt_t): Define as __syscall_ulong_t. (__SHM_PAD_TIME): New macro, depending on [__SHM_PAD_BEFORE_TIME] and [__SHM_PAD_AFTER_TIME]. (struct shmid_ds): Define time fields using __SHM_PAD_TIME. Define shm_segsz and associated padding based on [__SHM_SEGSZ_AFTER_TIME] and [__SHM_PAD_BETWEEN_TIME_AND_SEGSZ]. Use __syscall_ulong_t instead of unsigned long int. [__USE_MISC] (struct shminfo): Use __syscall_ulong_t instead of unsigned long int. [__USE_MISC] (struct shm_info): Likewise. * sysdeps/unix/sysv/linux/bits/shm-pad.h: New file. * sysdeps/unix/sysv/linux/hppa/bits/shm-pad.h: Likewise. * sysdeps/unix/sysv/linux/mips/bits/shm-pad.h: Likewise. * sysdeps/unix/sysv/linux/powerpc/bits/shm-pad.h: Likewise. * sysdeps/unix/sysv/linux/sparc/bits/shm-pad.h: Likewise. * sysdeps/unix/sysv/linux/x86/bits/shm-pad.h: Likewise. * sysdeps/unix/sysv/linux/hppa/bits/shm.h: Remove. * sysdeps/unix/sysv/linux/mips/bits/shm.h: Likewise. * sysdeps/unix/sysv/linux/powerpc/bits/shm.h: Likewise. * sysdeps/unix/sysv/linux/sparc/bits/shm.h: Likewise. * sysdeps/unix/sysv/linux/x86/bits/shm.h: Likewise.
119 lines
3.8 KiB
C
119 lines
3.8 KiB
C
/* Copyright (C) 1995-2018 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#ifndef _SYS_SHM_H
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# error "Never include <bits/shm.h> directly; use <sys/shm.h> instead."
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#endif
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#include <bits/types.h>
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#include <bits/wordsize.h>
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#include <bits/shmlba.h>
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#include <bits/shm-pad.h>
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/* Permission flag for shmget. */
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#define SHM_R 0400 /* or S_IRUGO from <linux/stat.h> */
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#define SHM_W 0200 /* or S_IWUGO from <linux/stat.h> */
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/* Flags for `shmat'. */
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#define SHM_RDONLY 010000 /* attach read-only else read-write */
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#define SHM_RND 020000 /* round attach address to SHMLBA */
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#define SHM_REMAP 040000 /* take-over region on attach */
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#define SHM_EXEC 0100000 /* execution access */
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/* Commands for `shmctl'. */
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#define SHM_LOCK 11 /* lock segment (root only) */
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#define SHM_UNLOCK 12 /* unlock segment (root only) */
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__BEGIN_DECLS
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/* Type to count number of attaches. */
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typedef __syscall_ulong_t shmatt_t;
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#if __SHM_PAD_BEFORE_TIME
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# define __SHM_PAD_TIME(NAME, RES) \
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unsigned long int __glibc_reserved ## RES; __time_t NAME
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#elif __SHM_PAD_AFTER_TIME
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# define __SHM_PAD_TIME(NAME, RES) \
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__time_t NAME; unsigned long int __glibc_reserved ## RES
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#else
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# define __SHM_PAD_TIME(NAME, RES) \
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__time_t NAME
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#endif
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/* Data structure describing a shared memory segment. */
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struct shmid_ds
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{
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struct ipc_perm shm_perm; /* operation permission struct */
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#if !__SHM_SEGSZ_AFTER_TIME
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size_t shm_segsz; /* size of segment in bytes */
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#endif
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__SHM_PAD_TIME (shm_atime, 1); /* time of last shmat() */
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__SHM_PAD_TIME (shm_dtime, 2); /* time of last shmdt() */
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__SHM_PAD_TIME (shm_ctime, 3); /* time of last change by shmctl() */
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#if __SHM_PAD_BETWEEN_TIME_AND_SEGSZ
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unsigned long int __glibc_reserved4;
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#endif
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#if __SHM_SEGSZ_AFTER_TIME
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size_t shm_segsz; /* size of segment in bytes */
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#endif
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__pid_t shm_cpid; /* pid of creator */
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__pid_t shm_lpid; /* pid of last shmop */
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shmatt_t shm_nattch; /* number of current attaches */
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__syscall_ulong_t __glibc_reserved5;
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__syscall_ulong_t __glibc_reserved6;
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};
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#ifdef __USE_MISC
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/* ipcs ctl commands */
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# define SHM_STAT 13
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# define SHM_INFO 14
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# define SHM_STAT_ANY 15
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/* shm_mode upper byte flags */
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# define SHM_DEST 01000 /* segment will be destroyed on last detach */
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# define SHM_LOCKED 02000 /* segment will not be swapped */
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# define SHM_HUGETLB 04000 /* segment is mapped via hugetlb */
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# define SHM_NORESERVE 010000 /* don't check for reservations */
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struct shminfo
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{
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__syscall_ulong_t shmmax;
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__syscall_ulong_t shmmin;
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__syscall_ulong_t shmmni;
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__syscall_ulong_t shmseg;
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__syscall_ulong_t shmall;
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__syscall_ulong_t __glibc_reserved1;
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__syscall_ulong_t __glibc_reserved2;
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__syscall_ulong_t __glibc_reserved3;
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__syscall_ulong_t __glibc_reserved4;
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};
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struct shm_info
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{
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int used_ids;
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__syscall_ulong_t shm_tot; /* total allocated shm */
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__syscall_ulong_t shm_rss; /* total resident shm */
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__syscall_ulong_t shm_swp; /* total swapped shm */
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__syscall_ulong_t swap_attempts;
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__syscall_ulong_t swap_successes;
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};
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#endif /* __USE_MISC */
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__END_DECLS
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