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Diffstat (limited to 'sysdeps/unix/sysv/linux/bits/shm.h')
| -rw-r--r-- | sysdeps/unix/sysv/linux/bits/shm.h | 92 |
1 files changed, 92 insertions, 0 deletions
diff --git a/sysdeps/unix/sysv/linux/bits/shm.h b/sysdeps/unix/sysv/linux/bits/shm.h new file mode 100644 index 0000000000..642b7bd191 --- /dev/null +++ b/sysdeps/unix/sysv/linux/bits/shm.h @@ -0,0 +1,92 @@ +/* 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_BUF_H + +#define _SYS_SHM_BUF_H 1 +#include <features.h> + +#include <sys/types.h> + +/* Permission flag for shmget. */ +#define SHM_R 0400 /* or S_IRUGO from <linux/stat.h> */ +#define SHM_W 0200 /* or S_IWUGO from <linux/stat.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 shm_perm; /* operation permission struct */ + int shm_segsz; /* size of segment in bytes */ + __time_t shm_atime; /* time of last shmat() */ + __time_t shm_dtime; /* time of last shmdt() */ + __time_t shm_ctime; /* time of last change by shmctl() */ + int shm_cpid; /* pid of creator */ + int shm_lpid; /* pid of last shmop */ + unsigned short int shm_nattch; /* number of current attaches */ + unsigned short int __shm_npages; /* size of segment (pages) */ + unsigned long int *__shm_pages; /* array of ptrs to frames -> SHMMAX */ + struct vm_area_struct *__attaches; /* descriptors for attaches */ +}; + +#ifdef __USE_MISC + +/* ipcs ctl commands */ +#define SHM_STAT 13 +#define SHM_INFO 14 + +/* shm_mode upper byte flags */ +#define SHM_DEST 01000 /* segment will be destroyed on last detach */ +#define SHM_LOCKED 02000 /* segment will not be swapped */ + +struct shminfo +{ + int shmmax; + int shmmin; + int shmmni; + int shmseg; + int shmall; +}; + +struct shm_info +{ + int used_ids; + ulong shm_tot; /* total allocated shm */ + ulong shm_rss; /* total resident shm */ + ulong shm_swp; /* total swapped shm */ + ulong swap_attempts; + ulong swap_successes; +}; + +#endif /* __USE_MISC */ + +__END_DECLS + +#endif /* _SYS_SHM_BUF_H */ |