sysdeps/unix/sysv/linux/i386/semctl.c

   1 /* Copyright (C) 1995-2014 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 <stdarg.h>
  21 #include <sys/sem.h>
  22 #include <ipc_priv.h>
  23
  24 #include <sysdep.h>
  25 #include <string.h>
  26 #include <sys/syscall.h>
  27
  28 #include <shlib-compat.h>
  29
  30 struct __old_semid_ds
  31 {
  32   struct __old_ipc_perm sem_perm;       /* operation permission struct */
  33   __time_t sem_otime;                   /* last semop() time */
  34   __time_t sem_ctime;                   /* last time changed by semctl() */
  35   struct sem *__sembase;                /* ptr to first semaphore in array */
  36   struct sem_queue *__sem_pending;      /* pending operations */
  37   struct sem_queue *__sem_pending_last; /* last pending operation */
  38   struct sem_undo *__undo;              /* ondo requests on this array */
  39   unsigned short int sem_nsems;         /* number of semaphores in set */
  40 };
  41
  42 /* Define a `union semun' suitable for Linux here.  */
  43 union semun
  44 {
  45   int val;                      /* value for SETVAL */
  46   struct semid_ds *buf;         /* buffer for IPC_STAT & IPC_SET */
  47   unsigned short int *array;    /* array for GETALL & SETALL */
  48   struct seminfo *__buf;        /* buffer for IPC_INFO */
  49   struct __old_semid_ds *__old_buf;
  50 };
  51
  52 /* Return identifier for array of NSEMS semaphores associated with
  53    KEY.  */
  54 #if SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_2)
  55 int __old_semctl (int semid, int semnum, int cmd, ...);
  56 #endif
  57 int __new_semctl (int semid, int semnum, int cmd, ...);
  58
  59 #if SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_2)
  60 int
  61 attribute_compat_text_section
  62 __old_semctl (int semid, int semnum, int cmd, ...)
  63 {
  64   union semun arg;
  65   va_list ap;
  66
  67   va_start (ap, cmd);
  68
  69   /* Get the argument.  */
  70   arg = va_arg (ap, union semun);
  71
  72   va_end (ap);
  73
  74   return INLINE_SYSCALL (ipc, 5, IPCOP_semctl, semid, semnum, cmd,
  75                          &arg);
  76 }
  77 compat_symbol (libc, __old_semctl, semctl, GLIBC_2_0);
  78 #endif
  79
  80 int
  81 __new_semctl (int semid, int semnum, int cmd, ...)
  82 {
  83   union semun arg;
  84   va_list ap;
  85
  86   va_start (ap, cmd);
  87
  88   /* Get the argument.  */
  89   arg = va_arg (ap, union semun);
  90
  91   va_end (ap);
  92
  93   return INLINE_SYSCALL (ipc, 5, IPCOP_semctl, semid, semnum, cmd | __IPC_64,
  94                          &arg);
  95 }
  96
  97 versioned_symbol (libc, __new_semctl, semctl, GLIBC_2_2);