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

   1 /* Copyright (C) 1995-2024 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    <https://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 #include <bits/wordsize.h>
  24 #include <bits/shmlba.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 /* Type to count number of attaches.  */
  43 typedef __syscall_ulong_t shmatt_t;
  44
  45 #include <bits/types/struct_shmid_ds.h>
  46 #include <bits/types/struct_shmid64_ds.h>
  47
  48 #ifdef __USE_MISC
  49
  50 /* ipcs ctl commands */
  51 # define SHM_STAT       13
  52 # define SHM_INFO       14
  53 # define SHM_STAT_ANY   15
  54
  55 /* shm_mode upper byte flags */
  56 # define SHM_DEST       01000   /* segment will be destroyed on last detach */
  57 # define SHM_LOCKED     02000   /* segment will not be swapped */
  58 # define SHM_HUGETLB    04000   /* segment is mapped via hugetlb */
  59 # define SHM_NORESERVE  010000  /* don't check for reservations */
  60
  61 struct  shminfo
  62   {
  63     __syscall_ulong_t shmmax;
  64     __syscall_ulong_t shmmin;
  65     __syscall_ulong_t shmmni;
  66     __syscall_ulong_t shmseg;
  67     __syscall_ulong_t shmall;
  68     __syscall_ulong_t __glibc_reserved1;
  69     __syscall_ulong_t __glibc_reserved2;
  70     __syscall_ulong_t __glibc_reserved3;
  71     __syscall_ulong_t __glibc_reserved4;
  72   };
  73
  74 struct shm_info
  75   {
  76     int used_ids;
  77     __syscall_ulong_t shm_tot;  /* total allocated shm */
  78     __syscall_ulong_t shm_rss;  /* total resident shm */
  79     __syscall_ulong_t shm_swp;  /* total swapped shm */
  80     __syscall_ulong_t swap_attempts;
  81     __syscall_ulong_t swap_successes;
  82   };
  83
  84 #endif /* __USE_MISC */
  85
  86 __END_DECLS