sysdeps/unix/sysv/linux/x86/bits/shm.h

   1 /* Copyright (C) 1995-2014 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, see
  16    <http://www.gnu.org/licenses/>.  */
  17
  18 #ifndef _SYS_SHM_H
  19 # error "Never include <bits/shm.h> directly; use <sys/shm.h> instead."
  20 #endif
  21
  22 #include <bits/types.h>
  23
  24 /* Permission flag for shmget.  */
  25 #define SHM_R           0400            /* or S_IRUGO from <linux/stat.h> */
  26 #define SHM_W           0200            /* or S_IWUGO from <linux/stat.h> */
  27
  28 /* Flags for `shmat'.  */
  29 #define SHM_RDONLY      010000          /* attach read-only else read-write */
  30 #define SHM_RND         020000          /* round attach address to SHMLBA */
  31 #define SHM_REMAP       040000          /* take-over region on attach */
  32 #define SHM_EXEC        0100000         /* execution access */
  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 __syscall_ulong_t 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 #ifndef __x86_64__
  55     unsigned long int __glibc_reserved1;
  56 #endif
  57     __time_t shm_dtime;                 /* time of last shmdt() */
  58 #ifndef __x86_64__
  59     unsigned long int __glibc_reserved2;
  60 #endif
  61     __time_t shm_ctime;                 /* time of last change by shmctl() */
  62 #ifndef __x86_64__
  63     unsigned long int __glibc_reserved3;
  64 #endif
  65     __pid_t shm_cpid;                   /* pid of creator */
  66     __pid_t shm_lpid;                   /* pid of last shmop */
  67     shmatt_t shm_nattch;                /* number of current attaches */
  68     __syscall_ulong_t __glibc_reserved4;
  69     __syscall_ulong_t __glibc_reserved5;
  70   };
  71
  72 #ifdef __USE_MISC
  73
  74 /* ipcs ctl commands */
  75 # define SHM_STAT       13
  76 # define SHM_INFO       14
  77
  78 /* shm_mode upper byte flags */
  79 # define SHM_DEST       01000   /* segment will be destroyed on last detach */
  80 # define SHM_LOCKED     02000   /* segment will not be swapped */
  81 # define SHM_HUGETLB    04000   /* segment is mapped via hugetlb */
  82 # define SHM_NORESERVE  010000  /* don't check for reservations */
  83
  84 struct  shminfo
  85   {
  86     __syscall_ulong_t shmmax;
  87     __syscall_ulong_t shmmin;
  88     __syscall_ulong_t shmmni;
  89     __syscall_ulong_t shmseg;
  90     __syscall_ulong_t shmall;
  91     __syscall_ulong_t __glibc_reserved1;
  92     __syscall_ulong_t __glibc_reserved2;
  93     __syscall_ulong_t __glibc_reserved3;
  94     __syscall_ulong_t __glibc_reserved4;
  95   };
  96
  97 struct shm_info
  98   {
  99     int used_ids;
 100     __syscall_ulong_t shm_tot;  /* total allocated shm */
 101     __syscall_ulong_t shm_rss;  /* total resident shm */
 102     __syscall_ulong_t shm_swp;  /* total swapped shm */
 103     __syscall_ulong_t swap_attempts;
 104     __syscall_ulong_t swap_successes;
 105   };
 106
 107 #endif /* __USE_MISC */
 108
 109 __END_DECLS