1 /* Copyright (C) 1995-2012 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, see 16 <http://www.gnu.org/licenses/>. */ 17 18 #ifndef _SYS_SHM_H 19 # error "Never include <bits/shm.h> directly; use <sys/shm.h> instead." 20 #endif 21 22 #include <bits/types.h> 23 24 /* Permission flag for shmget. */ 25 #define SHM_R 0400 /* or S_IRUGO from <linux/stat.h> */ 26 #define SHM_W 0200 /* or S_IWUGO from <linux/stat.h> */ 27 28 /* Flags for `shmat'. */ 29 #define SHM_RDONLY 010000 /* attach read-only else read-write */ 30 #define SHM_RND 020000 /* round attach address to SHMLBA */ 31 #define SHM_REMAP 040000 /* take-over region on attach */ 32 #define SHM_EXEC 0100000 /* execution access */ 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 ()) 42 extern int __getpagesize (void) __THROW __attribute__ ((__const__)); 43 44 45 /* Type to count number of attaches. */ 46 typedef __syscall_ulong_t shmatt_t; 47 48 /* Data structure describing a shared memory segment. */ 49 struct 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 #ifndef __x86_64__ 55 unsigned long int __unused1; 56 #endif 57 __time_t shm_dtime; /* time of last shmdt() */ 58 #ifndef __x86_64__ 59 unsigned long int __unused2; 60 #endif 61 __time_t shm_ctime; /* time of last change by shmctl() */ 62 #ifndef __x86_64__ 63 unsigned long int __unused3; 64 #endif 65 __pid_t shm_cpid; /* pid of creator */ 66 __pid_t shm_lpid; /* pid of last shmop */ 67 shmatt_t shm_nattch; /* number of current attaches */ 68 __syscall_ulong_t __unused4; 69 __syscall_ulong_t __unused5; 70 }; 71 72 #ifdef __USE_MISC 73 74 /* ipcs ctl commands */ 75 # define SHM_STAT 13 76 # define SHM_INFO 14 77 78 /* shm_mode upper byte flags */ 79 # define SHM_DEST 01000 /* segment will be destroyed on last detach */ 80 # define SHM_LOCKED 02000 /* segment will not be swapped */ 81 # define SHM_HUGETLB 04000 /* segment is mapped via hugetlb */ 82 # define SHM_NORESERVE 010000 /* don't check for reservations */ 83 84 struct shminfo 85 { 86 __syscall_ulong_t shmmax; 87 __syscall_ulong_t shmmin; 88 __syscall_ulong_t shmmni; 89 __syscall_ulong_t shmseg; 90 __syscall_ulong_t shmall; 91 __syscall_ulong_t __unused1; 92 __syscall_ulong_t __unused2; 93 __syscall_ulong_t __unused3; 94 __syscall_ulong_t __unused4; 95 }; 96 97 struct shm_info 98 { 99 int used_ids; 100 __syscall_ulong_t shm_tot; /* total allocated shm */ 101 __syscall_ulong_t shm_rss; /* total resident shm */ 102 __syscall_ulong_t shm_swp; /* total swapped shm */ 103 __syscall_ulong_t swap_attempts; 104 __syscall_ulong_t swap_successes; 105 }; 106 107 #endif /* __USE_MISC */ 108 109 __END_DECLS 110