1/* Copyright (C) 1995,1996,1997,2000,2002,2004 Free Software Foundation, Inc. 2 This file is part of the GNU C Library. 3 4 The GNU C Library is free software; you can redistribute it and/or 5 modify it under the terms of the GNU Lesser General Public 6 License as published by the Free Software Foundation; either 7 version 2.1 of the License, or (at your option) any later version. 8 9 The GNU C Library is distributed in the hope that it will be useful, 10 but WITHOUT ANY WARRANTY; without even the implied warranty of 11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 12 Lesser General Public License for more details. 13 14 You should have received a copy of the GNU Lesser General Public 15 License along with the GNU C Library; if not, write to the Free 16 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 17 02111-1307 USA. */ 18 19#ifndef _SYS_SHM_H 20# error "Never include <bits/shm.h> directly; use <sys/shm.h> instead." 21#endif 22 23#include <bits/types.h> 24 25/* Permission flag for shmget. */ 26#define SHM_R 0400 /* or S_IRUGO from <linux/stat.h> */ 27#define SHM_W 0200 /* or S_IWUGO from <linux/stat.h> */ 28 29/* Flags for `shmat'. */ 30#define SHM_RDONLY 010000 /* attach read-only else read-write */ 31#define SHM_RND 020000 /* round attach address to SHMLBA */ 32#define SHM_REMAP 040000 /* take-over region on attach */ 33 34/* Commands for `shmctl'. */ 35#define SHM_LOCK 11 /* lock segment (root only) */ 36#define SHM_UNLOCK 12 /* unlock segment (root only) */ 37 38__BEGIN_DECLS 39 40/* Segment low boundary address multiple. */ 41#define SHMLBA (__getpagesize () << 2) 42extern int __getpagesize (void) __THROW __attribute__ ((__const__)); 43 44 45/* Type to count number of attaches. */ 46typedef unsigned long int shmatt_t; 47 48/* Data structure describing a set of semaphores. */ 49struct shmid_ds 50 { 51 struct ipc_perm shm_perm; /* operation permission struct */ 52 size_t shm_segsz; /* size of segment in bytes */ 53 __time_t shm_atime; /* time of last shmat() */ 54 unsigned long int __unused1; 55 __time_t shm_dtime; /* time of last shmdt() */ 56 unsigned long int __unused2; 57 __time_t shm_ctime; /* time of last change by shmctl() */ 58 unsigned long int __unused3; 59 __pid_t shm_cpid; /* pid of creator */ 60 __pid_t shm_lpid; /* pid of last shmop */ 61 shmatt_t shm_nattch; /* number of current attaches */ 62 unsigned long int __unused4; 63 unsigned long int __unused5; 64 }; 65 66#ifdef __USE_MISC 67 68/* ipcs ctl commands */ 69# define SHM_STAT 13 70# define SHM_INFO 14 71 72/* shm_mode upper byte flags */ 73# define SHM_DEST 01000 /* segment will be destroyed on last detach */ 74# define SHM_LOCKED 02000 /* segment will not be swapped */ 75# define SHM_HUGETLB 04000 /* segment is mapped via hugetlb */ 76# define SHM_NORESERVE 010000 /* don't check for reservations */ 77 78struct shminfo 79 { 80 unsigned long int shmmax; 81 unsigned long int shmmin; 82 unsigned long int shmmni; 83 unsigned long int shmseg; 84 unsigned long int shmall; 85 unsigned long int __unused1; 86 unsigned long int __unused2; 87 unsigned long int __unused3; 88 unsigned long int __unused4; 89 }; 90 91struct shm_info 92 { 93 int used_ids; 94 unsigned long int shm_tot; /* total allocated shm */ 95 unsigned long int shm_rss; /* total resident shm */ 96 unsigned long int shm_swp; /* total swapped shm */ 97 unsigned long int swap_attempts; 98 unsigned long int swap_successes; 99 }; 100 101#endif /* __USE_MISC */ 102 103__END_DECLS 104