sysdeps/unix/sysv/linux/powerpc/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 #if __WORDSIZE == 32
  54     unsigned int __unused1;
  55 #endif
  56     __time_t shm_atime;                        /* time of last shmat() */
  57 #if __WORDSIZE == 32
  58     unsigned int __unused2;
  59 #endif
  60     __time_t shm_dtime;                        /* time of last shmdt() */
  61 #if __WORDSIZE == 32
  62     unsigned int __unused3;
  63 #endif
  64     __time_t shm_ctime;                 /* time of last change by shmctl() */
  65 #if __WORDSIZE == 32
  66     unsigned int __unused4;
  67 #endif
  68     size_t shm_segsz;                  /* size of segment in bytes */
  69     __pid_t shm_cpid;                  /* pid of creator */
  70     __pid_t shm_lpid;                  /* pid of last shmop */
  71     shmatt_t shm_nattch;               /* number of current attaches */
  72     unsigned long __unused5;
  73     unsigned long __unused6;
  74   };
  75
  76 #ifdef __USE_MISC
  77
  78 /* ipcs ctl commands */
  79 # define SHM_STAT      13
  80 # define SHM_INFO      14
  81
  82 /* shm_mode upper byte flags */
  83 # define SHM_DEST      01000    /* segment will be destroyed on last detach */
  84 # define SHM_LOCKED    02000    /* segment will not be swapped */
  85 # define SHM_HUGETLB   04000    /* segment is mapped via hugetlb */
  86 # define SHM_NORESERVE 010000   /* don't check for reservations */
  87
  88 struct shminfo
  89   {
  90     unsigned long int shmmax;
  91     unsigned long int shmmin;
  92     unsigned long int shmmni;
  93     unsigned long int shmseg;
  94     unsigned long int shmall;
  95     unsigned long int __unused1;
  96     unsigned long int __unused2;
  97     unsigned long int __unused3;
  98     unsigned long int __unused4;
  99   };
 100
 101 struct shm_info
 102   {
 103     int used_ids;
 104     unsigned long int shm_tot; /* total allocated shm */
 105     unsigned long int shm_rss; /* total resident shm */
 106     unsigned long int shm_swp; /* total swapped shm */
 107     unsigned long int swap_attempts;
 108     unsigned long int swap_successes;
 109   };
 110
 111 #endif /* __USE_MISC */
 112
 113 __END_DECLS