1 /* Copyright (C) 1995, 1996, 1997, 2000, 2002, 2004 2 Free Software Foundation, Inc. 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 33 /* Commands for `shmctl'. */ 34 #define SHM_LOCK 11 /* lock segment (root only) */ 35 #define SHM_UNLOCK 12 /* unlock segment (root only) */ 36 37 __BEGIN_DECLS 38 39 /* Segment low boundary address multiple. */ 40 #define SHMLBA (__getpagesize ()) 41 extern int __getpagesize (void) __THROW __attribute__ ((__const__)); 42 43 44 /* Type to count number of attaches. */ 45 typedef unsigned long int shmatt_t; 46 47 /* Data structure describing a set of semaphores. */ 48 struct shmid_ds 49 { 50 struct ipc_perm shm_perm; /* operation permission struct */ 51 unsigned int __pad1; 52 __time_t shm_atime; /* time of last shmat() */ 53 unsigned int __pad2; 54 __time_t shm_dtime; /* time of last shmdt() */ 55 unsigned int __pad3; 56 __time_t shm_ctime; /* time of last change by shmctl() */ 57 size_t shm_segsz; /* size of segment in bytes */ 58 __pid_t shm_cpid; /* pid of creator */ 59 __pid_t shm_lpid; /* pid of last shmop */ 60 shmatt_t shm_nattch; /* number of current attaches */ 61 unsigned long int __uclibc_unused1; 62 unsigned long int __uclibc_unused2; 63 }; 64 65 #ifdef __USE_MISC 66 67 /* ipcs ctl commands */ 68 # define SHM_STAT 13 69 # define SHM_INFO 14 70 71 /* shm_mode upper byte flags */ 72 # define SHM_DEST 01000 /* segment will be destroyed on last detach */ 73 # define SHM_LOCKED 02000 /* segment will not be swapped */ 74 # define SHM_HUGETLB 04000 /* segment is mapped via hugetlb */ 75 # define SHM_NORESERVE 010000 /* don't check for reservations */ 76 77 struct shminfo 78 { 79 unsigned long shmmax; 80 unsigned long shmmin; 81 unsigned long shmmni; 82 unsigned long shmseg; 83 unsigned long shmall; 84 unsigned long __uclibc_unused1; 85 unsigned long __uclibc_unused2; 86 unsigned long __uclibc_unused3; 87 unsigned long __uclibc_unused4; 88 }; 89 90 struct shm_info 91 { 92 int used_ids; 93 unsigned long int shm_tot; /* total allocated shm */ 94 unsigned long int shm_rss; /* total resident shm */ 95 unsigned long int shm_swp; /* total swapped shm */ 96 unsigned long int swap_attempts; 97 unsigned long int swap_successes; 98 }; 99 100 #endif /* __USE_MISC */ 101 102 __END_DECLS 103