sysdeps/unix/sysv/linux/s390/bits/shm.h

   1 /* Copyright (C) 2001, 2002, 2004 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, write to the Free
  16    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  17    02111-1307 USA.  */
  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
  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 #if __WORDSIZE != 64
  56   unsigned long int __unused1;
  57 #endif
  58     __time_t shm_dtime;                 /* time of last shmdt() */
  59 #if __WORDSIZE != 64
  60   unsigned long int __unused2;
  61 #endif
  62     __time_t shm_ctime;                 /* time of last change by shmctl() */
  63 #if __WORDSIZE != 64
  64   unsigned long int __unused3;
  65 #endif
  66     __pid_t shm_cpid;                   /* pid of creator */
  67     __pid_t shm_lpid;                   /* pid of last shmop */
  68     shmatt_t shm_nattch;                /* number of current attaches */
  69     unsigned long int __unused4;
  70     unsigned long int __unused5;
  71   };
  72
  73 #ifdef __USE_MISC
  74
  75 /* ipcs ctl commands */
  76 # define SHM_STAT       13
  77 # define SHM_INFO       14
  78
  79 /* shm_mode upper byte flags */
  80 # define SHM_DEST       01000   /* segment will be destroyed on last detach */
  81 # define SHM_LOCKED     02000   /* segment will not be swapped */
  82 # define SHM_HUGETLB    04000   /* segment is mapped via hugetlb */
  83 # define SHM_NORESERVE  010000  /* don't check for reservations */
  84
  85 struct  shminfo
  86   {
  87     unsigned long int shmmax;
  88     unsigned long int shmmin;
  89     unsigned long int shmmni;
  90     unsigned long int shmseg;
  91     unsigned long int shmall;
  92     unsigned long int __unused1;
  93     unsigned long int __unused2;
  94     unsigned long int __unused3;
  95     unsigned long int __unused4;
  96   };
  97
  98 struct shm_info
  99   {
 100     int used_ids;
 101     unsigned long int shm_tot;  /* total allocated shm */
 102     unsigned long int shm_rss;  /* total resident shm */
 103     unsigned long int shm_swp;  /* total swapped shm */
 104     unsigned long int swap_attempts;
 105     unsigned long int swap_successes;
 106   };
 107
 108 #endif /* __USE_MISC */
 109
 110 __END_DECLS