sysdeps/unix/sysv/linux/shmctl.c

   1 /* Copyright (C) 1995-2016 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3    Contributed by Ulrich Drepper <drepper@gnu.ai.mit.edu>, August 1995.
   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, see
  17    <http://www.gnu.org/licenses/>.  */
  18
  19 #include <errno.h>
  20 #include <sys/shm.h>
  21 #include <ipc_priv.h>
  22
  23 #include <sysdep.h>
  24 #include <string.h>
  25 #include <sys/syscall.h>
  26 #include <bits/wordsize.h>
  27 #include <shlib-compat.h>
  28
  29 #include <kernel-features.h>
  30
  31 struct __old_shmid_ds
  32 {
  33   struct __old_ipc_perm shm_perm;       /* operation permission struct */
  34   int shm_segsz;                        /* size of segment in bytes */
  35   __time_t shm_atime;                   /* time of last shmat() */
  36   __time_t shm_dtime;                   /* time of last shmdt() */
  37   __time_t shm_ctime;                   /* time of last change by shmctl() */
  38   __ipc_pid_t shm_cpid;                 /* pid of creator */
  39   __ipc_pid_t shm_lpid;                 /* pid of last shmop */
  40   unsigned short int shm_nattch;        /* number of current attaches */
  41   unsigned short int __shm_npages;      /* size of segment (pages) */
  42   unsigned long int *__shm_pages;       /* array of ptrs to frames -> SHMMAX */
  43   struct vm_area_struct *__attaches;    /* descriptors for attaches */
  44 };
  45
  46 struct __old_shminfo
  47 {
  48   int shmmax;
  49   int shmmin;
  50   int shmmni;
  51   int shmseg;
  52   int shmall;
  53 };
  54
  55 /* Provide operations to control over shared memory segments.  */
  56 #if SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_2)
  57 int __old_shmctl (int, int, struct __old_shmid_ds *);
  58 #endif
  59 int __new_shmctl (int, int, struct shmid_ds *);
  60
  61 #if SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_2)
  62 int
  63 attribute_compat_text_section
  64 __old_shmctl (int shmid, int cmd, struct __old_shmid_ds *buf)
  65 {
  66   return INLINE_SYSCALL (ipc, 5, IPCOP_shmctl, shmid, cmd, 0, buf);
  67 }
  68 compat_symbol (libc, __old_shmctl, shmctl, GLIBC_2_0);
  69 #endif
  70
  71 int
  72 __new_shmctl (int shmid, int cmd, struct shmid_ds *buf)
  73 {
  74   return INLINE_SYSCALL (ipc, 5, IPCOP_shmctl, shmid, cmd | __IPC_64, 0,
  75                          buf);
  76 }
  77
  78 versioned_symbol (libc, __new_shmctl, shmctl, GLIBC_2_2);