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

   1 /* Copyright (C) 1995, 1996, 1997, 2000, 2002, 2004
   2    Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   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, write to the Free
  17    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  18    02111-1307 USA.  */
  19
  20 #ifndef _SYS_SHM_H
  21 # error "Never include <bits/shm.h> directly; use <sys/shm.h> instead."
  22 #endif
  23
  24 #include <bits/types.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
  35 /* Commands for `shmctl'.  */
  36 #define SHM_LOCK        11              /* lock segment (root only) */
  37 #define SHM_UNLOCK      12              /* unlock segment (root only) */
  38
  39 __BEGIN_DECLS
  40
  41 /* Segment low boundary address multiple.  */
  42 #define SHMLBA          (__getpagesize ())
  43 extern int __getpagesize (void) __THROW __attribute__ ((__const__));
  44
  45
  46 /* Type to count number of attaches.  */
  47 typedef unsigned long int shmatt_t;
  48
  49 /* Data structure describing a shared memory segment.  */
  50 struct shmid_ds
  51   {
  52     struct ipc_perm shm_perm;           /* operation permission struct */
  53     size_t shm_segsz;                   /* size of segment in bytes */
  54     __time_t shm_atime;                 /* time of last shmat() */
  55     __time_t shm_dtime;                 /* time of last shmdt() */
  56     __time_t shm_ctime;                 /* time of last change by shmctl() */
  57     __pid_t shm_cpid;                   /* pid of creator */
  58     __pid_t shm_lpid;                   /* pid of last shmop */
  59     shmatt_t shm_nattch;                /* number of current attaches */
  60     unsigned long int __unused1;
  61     unsigned long int __unused2;
  62   };
  63
  64 #ifdef __USE_MISC
  65
  66 /* ipcs ctl commands */
  67 # define SHM_STAT       13
  68 # define SHM_INFO       14
  69
  70 /* shm_mode upper byte flags */
  71 # define SHM_DEST       01000   /* segment will be destroyed on last detach */
  72 # define SHM_LOCKED     02000   /* segment will not be swapped */
  73 # define SHM_HUGETLB    04000   /* segment is mapped via hugetlb */
  74 # define SHM_NORESERVE  010000  /* don't check for reservations */
  75
  76 struct  shminfo
  77   {
  78     unsigned long int shmmax;
  79     unsigned long int shmmin;
  80     unsigned long int shmmni;
  81     unsigned long int shmseg;
  82     unsigned long int shmall;
  83     unsigned long int __unused1;
  84     unsigned long int __unused2;
  85     unsigned long int __unused3;
  86     unsigned long int __unused4;
  87   };
  88
  89 struct shm_info
  90   {
  91     int used_ids;
  92     unsigned long int shm_tot;  /* total allocated shm */
  93     unsigned long int shm_rss;  /* total resident shm */
  94     unsigned long int shm_swp;  /* total swapped shm */
  95     unsigned long int swap_attempts;
  96     unsigned long int swap_successes;
  97   };
  98
  99 #endif /* __USE_MISC */
 100
 101 __END_DECLS