sysdeps/unix/sysv/linux/bits/shm.h

   1 /* Copyright (C) 1995, 1996, 1997 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3    Contributed by Ulrich Drepper <drepper@gnu.ai.mit.edu>, August 1995.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Library General Public License as
   7    published by the Free Software Foundation; either version 2 of the
   8    License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Library General Public License for more details.
  14
  15    You should have received a copy of the GNU Library General Public
  16    License along with the GNU C Library; see the file COPYING.LIB.  If not,
  17    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  18    Boston, MA 02111-1307, USA.  */
  19
  20 #ifndef _SYS_SHM_BUF_H
  21
  22 #define _SYS_SHM_BUF_H  1
  23 #include <features.h>
  24
  25 #include <sys/types.h>
  26
  27 /* Permission flag for shmget.  */
  28 #define SHM_R           0400            /* or S_IRUGO from <linux/stat.h> */
  29 #define SHM_W           0200            /* or S_IWUGO from <linux/stat.h> */
  30
  31 /* Flags for `shmat'.  */
  32 #define SHM_RDONLY      010000          /* attach read-only else read-write */
  33 #define SHM_RND         020000          /* round attach address to SHMLBA */
  34 #define SHM_REMAP       040000          /* take-over region on attach */
  35
  36 /* Commands for `shmctl'.  */
  37 #define SHM_LOCK        11              /* lock segment (root only) */
  38 #define SHM_UNLOCK      12              /* unlock segment (root only) */
  39
  40
  41 __BEGIN_DECLS
  42
  43 /* Data structure describing a set of semaphores.  */
  44 struct shmid_ds
  45 {
  46   struct ipc_perm shm_perm;             /* operation permission struct */
  47   int 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   int shm_cpid;                         /* pid of creator */
  52   int shm_lpid;                         /* pid of last shmop */
  53   unsigned short int shm_nattch;        /* number of current attaches */
  54   unsigned short int __shm_npages;      /* size of segment (pages) */
  55   unsigned long int *__shm_pages;       /* array of ptrs to frames -> SHMMAX */
  56   struct vm_area_struct *__attaches;    /* descriptors for attaches */
  57 };
  58
  59 #ifdef __USE_MISC
  60
  61 /* ipcs ctl commands */
  62 #define SHM_STAT        13
  63 #define SHM_INFO        14
  64
  65 /* shm_mode upper byte flags */
  66 #define SHM_DEST        01000   /* segment will be destroyed on last detach */
  67 #define SHM_LOCKED      02000   /* segment will not be swapped */
  68
  69 struct  shminfo
  70 {
  71   int shmmax;
  72   int shmmin;
  73   int shmmni;
  74   int shmseg;
  75   int shmall;
  76 };
  77
  78 struct shm_info
  79 {
  80   int   used_ids;
  81   ulong shm_tot;        /* total allocated shm */
  82   ulong shm_rss;        /* total resident shm */
  83   ulong shm_swp;        /* total swapped shm */
  84   ulong swap_attempts;
  85   ulong swap_successes;
  86 };
  87
  88 #endif /* __USE_MISC */
  89
  90 __END_DECLS
  91
  92 #endif /* _SYS_SHM_BUF_H */