1 /* Copyright (C) 1995,1996,1997,2000,2002,2004,2009 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 #define SHM_EXEC 0100000 /* execution access */ 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 shared memory segment. */ 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 unsigned long int __unused1; 56 __time_t shm_dtime; /* time of last shmdt() */ 57 unsigned long int __unused2; 58 __time_t shm_ctime; /* time of last change by shmctl() */ 59 unsigned long int __unused3; 60 __pid_t shm_cpid; /* pid of creator */ 61 __pid_t shm_lpid; /* pid of last shmop */ 62 shmatt_t shm_nattch; /* number of current attaches */ 63 unsigned long int __unused4; 64 unsigned long int __unused5; 65 }; 66 67 #ifdef __USE_MISC 68 69 /* ipcs ctl commands */ 70 # define SHM_STAT 13 71 # define SHM_INFO 14 72 73 /* shm_mode upper byte flags */ 74 # define SHM_DEST 01000 /* segment will be destroyed on last detach */ 75 # define SHM_LOCKED 02000 /* segment will not be swapped */ 76 # define SHM_HUGETLB 04000 /* segment is mapped via hugetlb */ 77 # define SHM_NORESERVE 010000 /* don't check for reservations */ 78 79 struct shminfo 80 { 81 unsigned long int shmmax; 82 unsigned long int shmmin; 83 unsigned long int shmmni; 84 unsigned long int shmseg; 85 unsigned long int shmall; 86 unsigned long int __unused1; 87 unsigned long int __unused2; 88 unsigned long int __unused3; 89 unsigned long int __unused4; 90 }; 91 92 struct shm_info 93 { 94 int used_ids; 95 unsigned long int shm_tot; /* total allocated shm */ 96 unsigned long int shm_rss; /* total resident shm */ 97 unsigned long int shm_swp; /* total swapped shm */ 98 unsigned long int swap_attempts; 99 unsigned long int swap_successes; 100 }; 101 102 #endif /* __USE_MISC */ 103 104 __END_DECLS 105
