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

   1 /* Copyright (C) 1995-2017 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 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     __time_t shm_dtime;                 /* time of last shmdt() */
  55     __time_t shm_ctime;                 /* time of last change by shmctl() */
  56     __pid_t shm_cpid;                   /* pid of creator */
  57     __pid_t shm_lpid;                   /* pid of last shmop */
  58     shmatt_t shm_nattch;                /* number of current attaches */
  59     unsigned long int __glibc_reserved1;
  60     unsigned long int __glibc_reserved2;
  61   };
  62
  63 #ifdef __USE_MISC
  64
  65 /* ipcs ctl commands */
  66 # define SHM_STAT       13
  67 # define SHM_INFO       14
  68
  69 /* shm_mode upper byte flags */
  70 # define SHM_DEST       01000   /* segment will be destroyed on last detach */
  71 # define SHM_LOCKED     02000   /* segment will not be swapped */
  72 # define SHM_HUGETLB    04000   /* segment is mapped via hugetlb */
  73 # define SHM_NORESERVE  010000  /* don't check for reservations */
  74
  75 struct  shminfo
  76   {
  77     unsigned long int shmmax;
  78     unsigned long int shmmin;
  79     unsigned long int shmmni;
  80     unsigned long int shmseg;
  81     unsigned long int shmall;
  82     unsigned long int __glibc_reserved1;
  83     unsigned long int __glibc_reserved2;
  84     unsigned long int __glibc_reserved3;
  85     unsigned long int __glibc_reserved4;
  86   };
  87
  88 struct shm_info
  89   {
  90     int used_ids;
  91     unsigned long int shm_tot;  /* total allocated shm */
  92     unsigned long int shm_rss;  /* total resident shm */
  93     unsigned long int shm_swp;  /* total swapped shm */
  94     unsigned long int swap_attempts;
  95     unsigned long int swap_successes;
  96   };
  97
  98 #endif /* __USE_MISC */
  99
 100 __END_DECLS