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Diffstat (limited to 'bits/shm.h')
| -rw-r--r-- | bits/shm.h | 53 |
1 files changed, 53 insertions, 0 deletions
diff --git a/bits/shm.h b/bits/shm.h new file mode 100644 index 0000000000..b41d0c1e86 --- /dev/null +++ b/bits/shm.h @@ -0,0 +1,53 @@ +/* Copyright (C) 1995, 1996, 1997 Free Software Foundation, Inc. + This file is part of the GNU C Library. + Contributed by Ulrich Drepper <drepper@gnu.ai.mit.edu>, August 1995. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Library General Public License as + published by the Free Software Foundation; either version 2 of the + License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Library General Public License for more details. + + You should have received a copy of the GNU Library General Public + License along with the GNU C Library; see the file COPYING.LIB. If not, + write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, + Boston, MA 02111-1307, USA. */ + +#ifndef _SYS_SHM_H +#error "Never use <bits/shm.h> directly; include <sys/shm.h> instead." +#endif + + +#include <features.h> +#include <sys/types.h> + +/* Flags for `shmat'. */ +#define SHM_RDONLY 010000 /* attach read-only else read-write */ +#define SHM_RND 020000 /* round attach address to SHMLBA */ +#define SHM_REMAP 040000 /* take-over region on attach */ + +/* Commands for `shmctl'. */ +#define SHM_LOCK 11 /* lock segment (root only) */ +#define SHM_UNLOCK 12 /* unlock segment (root only) */ + + +__BEGIN_DECLS + +/* Data structure describing a set of semaphores. */ +struct shmid_ds +{ + struct ipc_perm sem_perm; /* operation permission struct */ + int shm_segsz; /* size of segment in bytes */ + __time_t sem_atime; /* time of last shmat() */ + __time_t sem_dtime; /* time of last shmdt() */ + __time_t sem_ctime; /* time of last change by shmctl() */ + __pid_t shm_cpid; /* pid of creator */ + __pid_t shm_lpid; /* pid of last shmop */ + unsigned short int shm_nattch; /* number of current attaches */ +}; + +__END_DECLS |