sysdeps/unix/sysv/linux/shmctl.c

   1 /* Copyright (C) 1995-2017 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 <sys/shm.h>
  20 #include <stdarg.h>
  21 #include <ipc_priv.h>
  22 #include <sysdep.h>
  23 #include <shlib-compat.h>
  24 #include <errno.h>
  25
  26
  27 #ifndef DEFAULT_VERSION
  28 # define DEFAULT_VERSION GLIBC_2_2
  29 #endif
  30
  31
  32 /* Provide operations to control over shared memory segments.  */
  33 int
  34 __new_shmctl (int shmid, int cmd, struct shmid_ds *buf)
  35 {
  36 #ifdef __ASSUME_DIRECT_SYSVIPC_SYSCALLS
  37   return INLINE_SYSCALL_CALL (shmctl, shmid, cmd | __IPC_64, buf);
  38 #else
  39   return INLINE_SYSCALL_CALL (ipc, IPCOP_shmctl, shmid, cmd | __IPC_64, 0,
  40                               buf);
  41 #endif
  42 }
  43 versioned_symbol (libc, __new_shmctl, shmctl, DEFAULT_VERSION);
  44
  45
  46 #if SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_2)
  47 struct __old_shmid_ds
  48 {
  49   struct __old_ipc_perm shm_perm;       /* operation permission struct */
  50   int shm_segsz;                        /* size of segment in bytes */
  51   __time_t shm_atime;                   /* time of last shmat() */
  52   __time_t shm_dtime;                   /* time of last shmdt() */
  53   __time_t shm_ctime;                   /* time of last change by shmctl() */
  54   __ipc_pid_t shm_cpid;                 /* pid of creator */
  55   __ipc_pid_t shm_lpid;                 /* pid of last shmop */
  56   unsigned short int shm_nattch;        /* number of current attaches */
  57   unsigned short int __shm_npages;      /* size of segment (pages) */
  58   unsigned long int *__shm_pages;       /* array of ptrs to frames -> SHMMAX */
  59   struct vm_area_struct *__attaches;    /* descriptors for attaches */
  60 };
  61
  62 int
  63 attribute_compat_text_section
  64 __old_shmctl (int shmid, int cmd, struct __old_shmid_ds *buf)
  65 {
  66 #ifdef __ASSUME_DIRECT_SYSVIPC_SYSCALLS
  67   return INLINE_SYSCALL_CALL (shmctl, shmid, cmd, buf);
  68 #else
  69   return INLINE_SYSCALL_CALL (ipc, IPCOP_shmctl, shmid, cmd, 0, buf);
  70 #endif
  71 }
  72 compat_symbol (libc, __old_shmctl, shmctl, GLIBC_2_0);
  73 #endif