sysdeps/gnu/bits/shm.h

   1 /* Copyright (C) 1995, 1996, 1997, 2000 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 Library General Public License as
   6    published by the Free Software Foundation; either version 2 of the
   7    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    Library General Public License for more details.
  13
  14    You should have received a copy of the GNU Library General Public
  15    License along with the GNU C Library; see the file COPYING.LIB.  If not,
  16    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  17    Boston, MA 02111-1307, USA.  */
  18
  19 #ifndef _SYS_SHM_H
  20 # error "Never include <bits/shm.h> directly; use <sys/shm.h> instead."
  21 #endif
  22
  23 #include <bits/types.h>
  24
  25 /* Permission flag for shmget.  */
  26 #define SHM_R           0400            /* or S_IRUGO from <linux/stat.h> */
  27 #define SHM_W           0200            /* or S_IWUGO from <linux/stat.h> */
  28
  29 /* Flags for `shmat'.  */
  30 #define SHM_RDONLY      010000          /* attach read-only else read-write */
  31 #define SHM_RND         020000          /* round attach address to SHMLBA */
  32 #define SHM_REMAP       040000          /* take-over region on attach */
  33
  34 /* Commands for `shmctl'.  */
  35 #define SHM_LOCK        11              /* lock segment (root only) */
  36 #define SHM_UNLOCK      12              /* unlock segment (root only) */
  37
  38
  39 /* Type to count number of attaches.  */
  40 typedef unsigned short int shmatt_t;
  41
  42 /* Data structure describing a set of semaphores.  */
  43 struct shmid_ds
  44   {
  45     struct ipc_perm shm_perm;           /* operation permission struct */
  46     int shm_segsz;                      /* size of segment in bytes */
  47     __time_t shm_atime;                 /* time of last shmat() */
  48     __time_t shm_dtime;                 /* time of last shmdt() */
  49     __time_t shm_ctime;                 /* time of last change by shmctl() */
  50     __ipc_pid_t shm_cpid;               /* pid of creator */
  51     __ipc_pid_t shm_lpid;               /* pid of last shmop */
  52     shmatt_t shm_nattch;                /* number of current attaches */
  53     unsigned short int __shm_npages;    /* size of segment (pages) */
  54     unsigned long int *__shm_pages;     /* array of ptrs to frames -> SHMMAX */
  55     struct vm_area_struct *__attaches;  /* descriptors for attaches */
  56   };
  57
  58 #ifdef __USE_MISC
  59
  60 /* ipcs ctl commands */
  61 # define SHM_STAT       13
  62 # define SHM_INFO       14
  63
  64 /* shm_mode upper byte flags */
  65 # define SHM_DEST       01000   /* segment will be destroyed on last detach */
  66 # define SHM_LOCKED     02000   /* segment will not be swapped */
  67
  68 struct  shminfo
  69   {
  70     int shmmax;
  71     int shmmin;
  72     int shmmni;
  73     int shmseg;
  74     int shmall;
  75   };
  76
  77 struct shm_info
  78   {
  79     int used_ids;
  80     unsigned long int shm_tot;  /* total allocated shm */
  81     unsigned long int shm_rss;  /* total resident shm */
  82     unsigned long int shm_swp;  /* total swapped shm */
  83     unsigned long int swap_attempts;
  84     unsigned long int swap_successes;
  85   };
  86
  87 #endif /* __USE_MISC */