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glibc  2.9
semctl.c
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00001 /* Copyright (C) 2007 Free Software Foundation, Inc.
00002    This file is part of the GNU C Library.
00003 
00004    The GNU C Library is free software; you can redistribute it and/or
00005    modify it under the terms of the GNU Lesser General Public
00006    License as published by the Free Software Foundation; either
00007    version 2.1 of the License, or (at your option) any later version.
00008 
00009    The GNU C Library is distributed in the hope that it will be useful,
00010    but WITHOUT ANY WARRANTY; without even the implied warranty of
00011    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00012    Lesser General Public License for more details.
00013 
00014    You should have received a copy of the GNU Lesser General Public
00015    License along with the GNU C Library; if not, write to the Free
00016    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
00017    02111-1307 USA.  */
00018 
00019 #include <errno.h>
00020 #include <stdarg.h>
00021 #include <sys/sem.h>
00022 #include <ipc_priv.h>
00023 #include <sysdep.h>
00024 
00025 /* Define a `union semun' suitable for Linux here.  */
00026 union semun
00027 {
00028   int val;                  /* value for SETVAL */
00029   struct semid_ds *buf;            /* buffer for IPC_STAT & IPC_SET */
00030   unsigned short int *array;       /* array for GETALL & SETALL */
00031   struct seminfo *__buf;    /* buffer for IPC_INFO */
00032 };
00033 
00034 #include <bp-checks.h>
00035 #include <bp-semctl.h>             /* definition of CHECK_SEMCTL needs union semum */
00036 
00037 int __semctl (int semid, int semnum, int cmd, ...);
00038 
00039 int
00040 __semctl (int semid, int semnum, int cmd, ...)
00041 {
00042   union semun arg;
00043   va_list ap;
00044 
00045   va_start (ap, cmd);
00046 
00047   /* Get the argument.  */
00048   arg = va_arg (ap, union semun);
00049 
00050   va_end (ap);
00051 
00052   return INLINE_SYSCALL (semctl, 4, semid, semnum, cmd | __IPC_64,
00053                       CHECK_SEMCTL (&arg, semid, cmd | __IPC_64)->array);
00054 }
00055 
00056 #include <shlib-compat.h>
00057 versioned_symbol (libc, __semctl, semctl, GLIBC_2_0);