1 /* Copyright (C) 1995, 1996, 1997, 2000, 2002, 2004, 2009 2 Free Software Foundation, Inc. 3 This file is part of the GNU C Library. 4 5 The GNU C Library is free software; you can redistribute it and/or 6 modify it under the terms of the GNU Lesser General Public 7 License as published by the Free Software Foundation; either 8 version 2.1 of the License, or (at your option) any later version. 9 10 The GNU C Library is distributed in the hope that it will be useful, 11 but WITHOUT ANY WARRANTY; without even the implied warranty of 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 13 Lesser General Public License for more details. 14 15 You should have received a copy of the GNU Lesser General Public 16 License along with the GNU C Library; if not, write to the Free 17 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 18 02111-1307 USA. */ 19 20 #ifndef _SYS_SHM_H 21 # error "Never include <bits/shm.h> directly; use <sys/shm.h> instead." 22 #endif 23 24 #include <bits/types.h> 25 26 /* Permission flag for shmget. */ 27 #define SHM_R 0400 /* or S_IRUGO from <linux/stat.h> */ 28 #define SHM_W 0200 /* or S_IWUGO from <linux/stat.h> */ 29 30 /* Flags for `shmat'. */ 31 #define SHM_RDONLY 010000 /* attach read-only else read-write */ 32 #define SHM_RND 020000 /* round attach address to SHMLBA */ 33 #define SHM_REMAP 040000 /* take-over region on attach */ 34 #define SHM_EXEC 0100000 /* execution access */ 35 36 /* Commands for `shmctl'. */ 37 #define SHM_LOCK 11 /* lock segment (root only) */ 38 #define SHM_UNLOCK 12 /* unlock segment (root only) */ 39 40 __BEGIN_DECLS 41 42 /* Segment low boundary address multiple. */ 43 #define SHMLBA (__getpagesize ()) 44 extern int __getpagesize (void) __THROW __attribute__ ((__const__)); 45 46 47 /* Type to count number of attaches. */ 48 typedef unsigned long int shmatt_t; 49 50 /* Data structure describing a shared memory segment. */ 51 struct shmid_ds 52 { 53 struct ipc_perm shm_perm; /* operation permission struct */ 54 size_t shm_segsz; /* size of segment in bytes */ 55 __time_t shm_atime; /* time of last shmat() */ 56 #if __WORDSIZE == 32 57 unsigned long int __unused1; 58 #endif 59 __time_t shm_dtime; /* time of last shmdt() */ 60 #if __WORDSIZE == 32 61 unsigned long int __unused2; 62 #endif 63 __time_t shm_ctime; /* time of last change by shmctl() */ 64 #if __WORDSIZE == 32 65 unsigned long int __unused3; 66 #endif 67 __pid_t shm_cpid; /* pid of creator */ 68 __pid_t shm_lpid; /* pid of last shmop */ 69 shmatt_t shm_nattch; /* number of current attaches */ 70 unsigned long int __unused4; 71 unsigned long int __unused5; 72 }; 73 74 #ifdef __USE_MISC 75 76 /* ipcs ctl commands */ 77 # define SHM_STAT 13 78 # define SHM_INFO 14 79 80 /* shm_mode upper byte flags */ 81 # define SHM_DEST 01000 /* segment will be destroyed on last detach */ 82 # define SHM_LOCKED 02000 /* segment will not be swapped */ 83 # define SHM_HUGETLB 04000 /* segment is mapped via hugetlb */ 84 # define SHM_NORESERVE 010000 /* don't check for reservations */ 85 86 struct shminfo 87 { 88 unsigned long int shmmax; 89 unsigned long int shmmin; 90 unsigned long int shmmni; 91 unsigned long int shmseg; 92 unsigned long int shmall; 93 unsigned long int __unused1; 94 unsigned long int __unused2; 95 unsigned long int __unused3; 96 unsigned long int __unused4; 97 }; 98 99 struct shm_info 100 { 101 int used_ids; 102 unsigned long int shm_tot; /* total allocated shm */ 103 unsigned long int shm_rss; /* total resident shm */ 104 unsigned long int shm_swp; /* total swapped shm */ 105 unsigned long int swap_attempts; 106 unsigned long int swap_successes; 107 }; 108 109 #endif /* __USE_MISC */ 110 111 __END_DECLS 112
