sysvipc/sys/shm.h

   1 /* Copyright (C) 1995-2024 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 #define _SYS_SHM_H      1
  20
  21 #include <features.h>
  22
  23 #define __need_size_t
  24 #include <stddef.h>
  25
  26 /* Get common definition of System V style IPC.  */
  27 #include <sys/ipc.h>
  28
  29 /* Get system dependent definition of `struct shmid_ds' and more.  */
  30 #include <bits/shm.h>
  31
  32 /* Define types required by the standard.  */
  33 #include <bits/types/time_t.h>
  34
  35 #ifdef __USE_XOPEN
  36 # ifndef __pid_t_defined
  37 typedef __pid_t pid_t;
  38 #  define __pid_t_defined
  39 # endif
  40 #endif  /* X/Open */
  41
  42
  43 __BEGIN_DECLS
  44
  45 /* The following System V style IPC functions implement a shared memory
  46    facility.  The definition is found in XPG4.2.  */
  47
  48 /* Shared memory control operation.  */
  49 #ifndef __USE_TIME64_REDIRECTS
  50 extern int shmctl (int __shmid, int __cmd, struct shmid_ds *__buf) __THROW;
  51 #else
  52 # ifdef __REDIRECT_NTH
  53 extern int __REDIRECT_NTH (shmctl,
  54                            (int __shmid, int __cmd, struct shmid_ds *__buf),
  55                            __shmctl64);
  56 # else
  57 #  define shmctl __shmctl64
  58 # endif
  59 #endif
  60
  61 /* Get shared memory segment.  */
  62 extern int shmget (key_t __key, size_t __size, int __shmflg) __THROW;
  63
  64 /* Attach shared memory segment.  */
  65 extern void *shmat (int __shmid, const void *__shmaddr, int __shmflg)
  66      __THROW;
  67
  68 /* Detach shared memory segment.  */
  69 extern int shmdt (const void *__shmaddr) __THROW;
  70
  71 __END_DECLS
  72
  73 #endif /* sys/shm.h */