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| 1 | /* Copyright (C) 1995-2022 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 | <https://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 | /* Flags for `shmat'. */ |
| 25 | #define SHM_RDONLY 010000 /* attach read-only else read-write */ |
| 26 | #define SHM_RND 020000 /* round attach address to SHMLBA */ |
| 27 | #define SHM_REMAP 040000 /* take-over region on attach */ |
| 28 | |
| 29 | /* Commands for `shmctl'. */ |
| 30 | #define SHM_LOCK 11 /* lock segment (root only) */ |
| 31 | #define SHM_UNLOCK 12 /* unlock segment (root only) */ |
| 32 | |
| 33 | __BEGIN_DECLS |
| 34 | |
| 35 | /* Segment low boundary address multiple. */ |
| 36 | #define SHMLBA (__getpagesize ()) |
| 37 | extern int __getpagesize (void) __THROW __attribute__ ((__const__)); |
| 38 | |
| 39 | |
| 40 | /* Type to count number of attaches. */ |
| 41 | typedef unsigned short int shmatt_t; |
| 42 | |
| 43 | /* Data structure describing a shared memory segment. */ |
| 44 | struct shmid_ds |
| 45 | { |
| 46 | struct ipc_perm shm_perm; /* operation permission struct */ |
| 47 | size_t shm_segsz; /* size of segment in bytes */ |
| 48 | __time_t shm_atime; /* time of last shmat() */ |
| 49 | __time_t shm_dtime; /* time of last shmdt() */ |
| 50 | __time_t shm_ctime; /* time of last change by shmctl() */ |
| 51 | __pid_t shm_cpid; /* pid of creator */ |
| 52 | __pid_t shm_lpid; /* pid of last shmop */ |
| 53 | shmatt_t shm_nattch; /* number of current attaches */ |
| 54 | }; |
| 55 | |
| 56 | __END_DECLS |
| 57 |
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