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glibc  2.9
fcntl.c
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00001 /* Copyright (C) 2000, 2002, 2003, 2004 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 <assert.h>
00020 #include <errno.h>
00021 #include <sysdep-cancel.h>  /* Must come before <fcntl.h>.  */
00022 #include <fcntl.h>
00023 #include <stdarg.h>
00024 
00025 #include <sys/syscall.h>
00026 
00027 
00028 #ifndef NO_CANCELLATION
00029 int
00030 __fcntl_nocancel (int fd, int cmd, ...)
00031 {
00032   va_list ap;
00033   void *arg;
00034 
00035   va_start (ap, cmd);
00036   arg = va_arg (ap, void *);
00037   va_end (ap);
00038 
00039   return INLINE_SYSCALL (fcntl, 3, fd, cmd, arg);
00040 }
00041 #endif
00042 
00043 
00044 int
00045 __libc_fcntl (int fd, int cmd, ...)
00046 {
00047   va_list ap;
00048   void *arg;
00049 
00050   va_start (ap, cmd);
00051   arg = va_arg (ap, void *);
00052   va_end (ap);
00053 
00054   if (cmd >= F_GETLK64 && cmd <= F_SETLKW64)
00055     cmd -= F_GETLK64 - F_GETLK;
00056 
00057   if (SINGLE_THREAD_P || cmd != F_SETLKW)
00058     return INLINE_SYSCALL (fcntl, 3, fd, cmd, arg);
00059 
00060   int oldtype = LIBC_CANCEL_ASYNC ();
00061 
00062   int result = INLINE_SYSCALL (fcntl, 3, fd, cmd, arg);
00063 
00064   LIBC_CANCEL_RESET (oldtype);
00065 
00066   return result;
00067 }
00068 libc_hidden_def (__libc_fcntl)
00069 
00070 weak_alias (__libc_fcntl, __fcntl)
00071 libc_hidden_weak (__fcntl)
00072 weak_alias (__libc_fcntl, fcntl)