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dff8da6b | 1 | /* Copyright (C) 1995-2024 Free Software Foundation, Inc. |
6d52618b | 2 | This file is part of the GNU C Library. |
60478656 | 3 | |
6d52618b | 4 | The GNU C Library is free software; you can redistribute it and/or |
41bdb6e2 AJ |
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. | |
60478656 | 8 | |
6d52618b UD |
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 | |
41bdb6e2 | 12 | Lesser General Public License for more details. |
60478656 | 13 | |
41bdb6e2 | 14 | You should have received a copy of the GNU Lesser General Public |
59ba27a6 | 15 | License along with the GNU C Library; if not, see |
5a82c748 | 16 | <https://www.gnu.org/licenses/>. */ |
60478656 | 17 | |
5107cf1d | 18 | #ifndef _SYS_SHM_H |
f4017d20 | 19 | # error "Never include <bits/shm.h> directly; use <sys/shm.h> instead." |
5107cf1d UD |
20 | #endif |
21 | ||
0ed99ce4 | 22 | #include <bits/types.h> |
60478656 RM |
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 | ||
2566e5f3 UD |
33 | __BEGIN_DECLS |
34 | ||
ed5294d5 UD |
35 | /* Segment low boundary address multiple. */ |
36 | #define SHMLBA (__getpagesize ()) | |
37 | extern int __getpagesize (void) __THROW __attribute__ ((__const__)); | |
38 | ||
60478656 | 39 | |
0ed99ce4 UD |
40 | /* Type to count number of attaches. */ |
41 | typedef unsigned short int shmatt_t; | |
42 | ||
a0f6c236 | 43 | /* Data structure describing a shared memory segment. */ |
60478656 | 44 | struct shmid_ds |
f4017d20 | 45 | { |
924c3f59 | 46 | struct ipc_perm shm_perm; /* operation permission struct */ |
d2d9dfb6 | 47 | size_t shm_segsz; /* size of segment in bytes */ |
924c3f59 UD |
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() */ | |
f4017d20 UD |
51 | __pid_t shm_cpid; /* pid of creator */ |
52 | __pid_t shm_lpid; /* pid of last shmop */ | |
0ed99ce4 | 53 | shmatt_t shm_nattch; /* number of current attaches */ |
f4017d20 | 54 | }; |
2566e5f3 UD |
55 | |
56 | __END_DECLS |