1 /* Copyright (C) 1995,1996,1997,2000,2002,2004 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 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 () << 2) 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 size_t shm_segsz; /* size of segment in bytes */ 52 #if defined(__UCLIBC_USE_TIME64__) 53 __time_t shm_atime; 54 __time_t shm_dtime; 55 __time_t shm_ctime; 56 #else 57 __time_t shm_atime; /* time of last shmat() */ 58 unsigned long int __uclibc_unused1; 59 __time_t shm_dtime; /* time of last shmdt() */ 60 unsigned long int __uclibc_unused2; 61 __time_t shm_ctime; /* time of last change by shmctl() */ 62 unsigned long int __uclibc_unused3; 63 #endif 64 __pid_t shm_cpid; /* pid of creator */ 65 __pid_t shm_lpid; /* pid of last shmop */ 66 shmatt_t shm_nattch; /* number of current attaches */ 67 unsigned long int __uclibc_unused4; 68 unsigned long int __uclibc_unused5; 69 }; 70 71 #ifdef __USE_MISC 72 73 /* ipcs ctl commands */ 74 # define SHM_STAT 13 75 # define SHM_INFO 14 76 77 /* shm_mode upper byte flags */ 78 # define SHM_DEST 01000 /* segment will be destroyed on last detach */ 79 # define SHM_LOCKED 02000 /* segment will not be swapped */ 80 # define SHM_HUGETLB 04000 /* segment is mapped via hugetlb */ 81 # define SHM_NORESERVE 010000 /* don't check for reservations */ 82 83 struct shminfo 84 { 85 unsigned long int shmmax; 86 unsigned long int shmmin; 87 unsigned long int shmmni; 88 unsigned long int shmseg; 89 unsigned long int shmall; 90 unsigned long int __uclibc_unused1; 91 unsigned long int __uclibc_unused2; 92 unsigned long int __uclibc_unused3; 93 unsigned long int __uclibc_unused4; 94 }; 95 96 struct shm_info 97 { 98 int used_ids; 99 unsigned long int shm_tot; /* total allocated shm */ 100 unsigned long int shm_rss; /* total resident shm */ 101 unsigned long int shm_swp; /* total swapped shm */ 102 unsigned long int swap_attempts; 103 unsigned long int swap_successes; 104 }; 105 106 #endif /* __USE_MISC */ 107 108 __END_DECLS 109