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

   1 /* Copyright (C) 2011-2015 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3    Contributed by Chris Metcalf <cmetcalf@tilera.com>, 2011.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the 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    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library.  If not, see
  17    <http://www.gnu.org/licenses/>.  */
  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 #include <bits/wordsize.h>
  25
  26 /* Permission flag for shmget.  */
  27 #define SHM_R           0400            /* or S_IRUGO from <linux/stat.h> */
  28 #define SHM_W           0200            /* or S_IWUGO from <linux/stat.h> */
  29
  30 /* Flags for `shmat'.  */
  31 #define SHM_RDONLY      010000          /* attach read-only else read-write */
  32 #define SHM_RND         020000          /* round attach address to SHMLBA */
  33 #define SHM_REMAP       040000          /* take-over region on attach */
  34 #define SHM_EXEC        0100000         /* execution access */
  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 __BEGIN_DECLS
  41
  42 /* Segment low boundary address multiple.  */
  43 #define SHMLBA          (__getpagesize ())
  44 extern int __getpagesize (void) __THROW __attribute__ ((__const__));
  45
  46
  47 /* Type to count number of attaches.  */
  48 typedef unsigned long int shmatt_t;
  49
  50 /* Data structure describing a shared memory segment.  */
  51 struct shmid_ds
  52   {
  53     struct ipc_perm shm_perm;           /* operation permission struct */
  54     size_t shm_segsz;                   /* size of segment in bytes */
  55     __time_t shm_atime;                 /* time of last shmat() */
  56 #if __WORDSIZE == 32
  57     unsigned long int __glibc_reserved1;
  58 #endif
  59     __time_t shm_dtime;                 /* time of last shmdt() */
  60 #if __WORDSIZE == 32
  61     unsigned long int __glibc_reserved2;
  62 #endif
  63     __time_t shm_ctime;                 /* time of last change by shmctl() */
  64 #if __WORDSIZE == 32
  65     unsigned long int __glibc_reserved3;
  66 #endif
  67     __pid_t shm_cpid;                   /* pid of creator */
  68     __pid_t shm_lpid;                   /* pid of last shmop */
  69     shmatt_t shm_nattch;                /* number of current attaches */
  70     unsigned long int __glibc_reserved4;
  71     unsigned long int __glibc_reserved5;
  72   };
  73
  74 #ifdef __USE_MISC
  75
  76 /* ipcs ctl commands */
  77 # define SHM_STAT       13
  78 # define SHM_INFO       14
  79
  80 /* shm_mode upper byte flags */
  81 # define SHM_DEST       01000   /* segment will be destroyed on last detach */
  82 # define SHM_LOCKED     02000   /* segment will not be swapped */
  83 # define SHM_HUGETLB    04000   /* segment is mapped via hugetlb */
  84 # define SHM_NORESERVE  010000  /* don't check for reservations */
  85
  86 struct  shminfo
  87   {
  88     unsigned long int shmmax;
  89     unsigned long int shmmin;
  90     unsigned long int shmmni;
  91     unsigned long int shmseg;
  92     unsigned long int shmall;
  93     unsigned long int __glibc_reserved1;
  94     unsigned long int __glibc_reserved2;
  95     unsigned long int __glibc_reserved3;
  96     unsigned long int __glibc_reserved4;
  97   };
  98
  99 struct shm_info
 100   {
 101     int used_ids;
 102     unsigned long int shm_tot;  /* total allocated shm */
 103     unsigned long int shm_rss;  /* total resident shm */
 104     unsigned long int shm_swp;  /* total swapped shm */
 105     unsigned long int swap_attempts;
 106     unsigned long int swap_successes;
 107   };
 108
 109 #endif /* __USE_MISC */
 110
 111 __END_DECLS