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glibc/bits/shm.h
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/* Copyright (C) 1995-2016 Free Software Foundation, Inc. | |
This file is part of the GNU C Library. | |
The GNU C Library is free software; you can redistribute it and/or | |
modify it under the terms of the GNU Lesser General Public | |
License as published by the Free Software Foundation; either | |
version 2.1 of the License, or (at your option) any later version. | |
The GNU C Library is distributed in the hope that it will be useful, | |
but WITHOUT ANY WARRANTY; without even the implied warranty of | |
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
Lesser General Public License for more details. | |
You should have received a copy of the GNU Lesser General Public | |
License along with the GNU C Library; if not, see | |
<http://www.gnu.org/licenses/>. */ | |
#ifndef _SYS_SHM_H | |
# error "Never include <bits/shm.h> directly; use <sys/shm.h> instead." | |
#endif | |
#include <bits/types.h> | |
/* Flags for `shmat'. */ | |
#define SHM_RDONLY 010000 /* attach read-only else read-write */ | |
#define SHM_RND 020000 /* round attach address to SHMLBA */ | |
#define SHM_REMAP 040000 /* take-over region on attach */ | |
/* Commands for `shmctl'. */ | |
#define SHM_LOCK 11 /* lock segment (root only) */ | |
#define SHM_UNLOCK 12 /* unlock segment (root only) */ | |
__BEGIN_DECLS | |
/* Segment low boundary address multiple. */ | |
#define SHMLBA (__getpagesize ()) | |
extern int __getpagesize (void) __THROW __attribute__ ((__const__)); | |
/* Type to count number of attaches. */ | |
typedef unsigned short int shmatt_t; | |
/* Data structure describing a shared memory segment. */ | |
struct shmid_ds | |
{ | |
struct ipc_perm shm_perm; /* operation permission struct */ | |
int shm_segsz; /* size of segment in bytes */ | |
__time_t shm_atime; /* time of last shmat() */ | |
__time_t shm_dtime; /* time of last shmdt() */ | |
__time_t shm_ctime; /* time of last change by shmctl() */ | |
__pid_t shm_cpid; /* pid of creator */ | |
__pid_t shm_lpid; /* pid of last shmop */ | |
shmatt_t shm_nattch; /* number of current attaches */ | |
}; | |
__END_DECLS |