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

   1 /* Copyright (C) 1995,1996,1997,2000,2002,2004 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, write to the Free
  16    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  17    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 __BEGIN_DECLS
  39
  40 /* Segment low boundary address multiple.  */
  41 #define SHMLBA          (__getpagesize ())
  42 extern int __getpagesize (void) __THROW __attribute__ ((__const__));
  43
  44
  45 /* Type to count number of attaches.  */
  46 typedef unsigned long int shmatt_t;
  47
  48 /* Data structure describing a shared memory segment.  */
  49 struct shmid_ds
  50   {
  51     struct ipc_perm shm_perm;           /* operation permission struct */
  52     size_t shm_segsz;                   /* size of segment in bytes */
  53     __time_t shm_atime;                 /* time of last shmat() */
  54     unsigned long int __unused1;
  55     __time_t shm_dtime;                 /* time of last shmdt() */
  56     unsigned long int __unused2;
  57     __time_t shm_ctime;                 /* time of last change by shmctl() */
  58     unsigned long int __unused3;
  59     __pid_t shm_cpid;                   /* pid of creator */
  60     __pid_t shm_lpid;                   /* pid of last shmop */
  61     shmatt_t shm_nattch;                /* number of current attaches */
  62     unsigned long int __unused4;
  63     unsigned long int __unused5;
  64   };
  65
  66 #ifdef __USE_MISC
  67
  68 /* ipcs ctl commands */
  69 # define SHM_STAT       13
  70 # define SHM_INFO       14
  71
  72 /* shm_mode upper byte flags */
  73 # define SHM_DEST       01000   /* segment will be destroyed on last detach */
  74 # define SHM_LOCKED     02000   /* segment will not be swapped */
  75 # define SHM_HUGETLB    04000   /* segment is mapped via hugetlb */
  76 # define SHM_NORESERVE  010000  /* don't check for reservations */
  77
  78 struct  shminfo
  79   {
  80     unsigned long int shmmax;
  81     unsigned long int shmmin;
  82     unsigned long int shmmni;
  83     unsigned long int shmseg;
  84     unsigned long int shmall;
  85     unsigned long int __unused1;
  86     unsigned long int __unused2;
  87     unsigned long int __unused3;
  88     unsigned long int __unused4;
  89   };
  90
  91 struct shm_info
  92   {
  93     int used_ids;
  94     unsigned long int shm_tot;  /* total allocated shm */
  95     unsigned long int shm_rss;  /* total resident shm */
  96     unsigned long int shm_swp;  /* total swapped shm */
  97     unsigned long int swap_attempts;
  98     unsigned long int swap_successes;
  99   };
 100
 101 #endif /* __USE_MISC */
 102
 103 __END_DECLS