1 /* Copyright (C) 1995,1996,1997,2000,2001,2002,2003 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 /* Segment low boundary address multiple. */ 39 #define SHMLBA 0x40000 40 41 42 /* Type to count number of attaches. */ 43 typedef unsigned long int shmatt_t; 44 45 /* Data structure describing a shared memory segment. */ 46 struct shmid_ds 47 { 48 struct ipc_perm shm_perm; /* operation permission struct */ 49 size_t shm_segsz; /* size of segment in bytes */ 50 __time_t shm_atime; /* time of last shmat() */ 51 __time_t shm_dtime; /* time of last shmdt() */ 52 __time_t shm_ctime; /* time of last change by shmctl() */ 53 __pid_t shm_cpid; /* pid of creator */ 54 __pid_t shm_lpid; /* pid of last shmop */ 55 shmatt_t shm_nattch; /* number of current attaches */ 56 unsigned long int __unused1; 57 unsigned long int __unused2; 58 }; 59 60 #ifdef __USE_MISC 61 62 /* ipcs ctl commands */ 63 # define SHM_STAT 13 64 # define SHM_INFO 14 65 66 /* shm_mode upper byte flags */ 67 # define SHM_DEST 01000 /* segment will be destroyed on last detach */ 68 # define SHM_LOCKED 02000 /* segment will not be swapped */ 69 # define SHM_HUGETLB 04000 /* segment is mapped via hugetlb */ 70 71 struct shminfo 72 { 73 unsigned long int shmmax; 74 unsigned long int shmmin; 75 unsigned long int shmmni; 76 unsigned long int shmseg; 77 unsigned long int shmall; 78 unsigned long int __unused1; 79 unsigned long int __unused2; 80 unsigned long int __unused3; 81 unsigned long int __unused4; 82 }; 83 84 struct shm_info 85 { 86 int used_ids; 87 unsigned long int shm_tot; /* total allocated shm */ 88 unsigned long int shm_rss; /* total resident shm */ 89 unsigned long int shm_swp; /* total swapped shm */ 90 unsigned long int swap_attempts; 91 unsigned long int swap_successes; 92 }; 93 94 #endif /* __USE_MISC */ 95