1 /* Copyright (C) 1995, 1996, 1997, 2000, 2002, 2004 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 35 /* Commands for `shmctl'. */ 36 #define SHM_LOCK 11 /* lock segment (root only) */ 37 #define SHM_UNLOCK 12 /* unlock segment (root only) */ 38 39 __BEGIN_DECLS 40 41 /* Segment low boundary address multiple. */ 42 #define SHMLBA (__getpagesize ()) 43 extern int __getpagesize (void) __THROW __attribute__ ((__const__)); 44 45 46 /* Type to count number of attaches. */ 47 typedef unsigned long int shmatt_t; 48 49 /* Data structure describing a set of semaphores. */ 50 struct shmid_ds 51 { 52 struct ipc_perm shm_perm; /* operation permission struct */ 53 size_t shm_segsz; /* size of segment in bytes */ 54 __time_t shm_atime; /* time of last shmat() */ 55 #if __WORDSIZE == 32 56 unsigned long int __unused1; 57 #endif 58 __time_t shm_dtime; /* time of last shmdt() */ 59 #if __WORDSIZE == 32 60 unsigned long int __unused2; 61 #endif 62 __time_t shm_ctime; /* time of last change by shmctl() */ 63 #if __WORDSIZE == 32 64 unsigned long int __unused3; 65 #endif 66 __pid_t shm_cpid; /* pid of creator */ 67 __pid_t shm_lpid; /* pid of last shmop */ 68 shmatt_t shm_nattch; /* number of current attaches */ 69 unsigned long int __unused4; 70 unsigned long int __unused5; 71 }; 72 73 #ifdef __USE_MISC 74 75 /* ipcs ctl commands */ 76 # define SHM_STAT 13 77 # define SHM_INFO 14 78 79 /* shm_mode upper byte flags */ 80 # define SHM_DEST 01000 /* segment will be destroyed on last detach */ 81 # define SHM_LOCKED 02000 /* segment will not be swapped */ 82 # define SHM_HUGETLB 04000 /* segment is mapped via hugetlb */ 83 # define SHM_NORESERVE 010000 /* don't check for reservations */ 84 85 struct shminfo 86 { 87 unsigned long int shmmax; 88 unsigned long int shmmin; 89 unsigned long int shmmni; 90 unsigned long int shmseg; 91 unsigned long int shmall; 92 unsigned long int __unused1; 93 unsigned long int __unused2; 94 unsigned long int __unused3; 95 unsigned long int __unused4; 96 }; 97 98 struct shm_info 99 { 100 int used_ids; 101 unsigned long int shm_tot; /* total allocated shm */ 102 unsigned long int shm_rss; /* total resident shm */ 103 unsigned long int shm_swp; /* total swapped shm */ 104 unsigned long int swap_attempts; 105 unsigned long int swap_successes; 106 }; 107 108 #endif /* __USE_MISC */ 109 110 __END_DECLS 111