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

   1 /* Copyright (C) 2000-2014 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the License, or (at your option) any later version.
   8
   9    The GNU C Library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, see
  16    <http://www.gnu.org/licenses/>.  */
  17
  18 #include <assert.h>
  19 #include <errno.h>
  20 #include <sysdep-cancel.h>      /* Must come before <fcntl.h>.  */
  21 #include <fcntl.h>
  22 #include <stdarg.h>
  23
  24 #include <sys/syscall.h>
  25
  26 #ifndef NO_CANCELLATION
  27 int
  28 __fcntl_nocancel (int fd, int cmd, ...)
  29 {
  30   va_list ap;
  31   void *arg;
  32
  33   va_start (ap, cmd);
  34   arg = va_arg (ap, void *);
  35   va_end (ap);
  36
  37   return INLINE_SYSCALL (fcntl64, 3, fd, cmd, arg);
  38 }
  39 #endif /* NO_CANCELLATION */
  40
  41
  42 int
  43 __libc_fcntl (int fd, int cmd, ...)
  44 {
  45   va_list ap;
  46   void *arg;
  47
  48   va_start (ap, cmd);
  49   arg = va_arg (ap, void *);
  50   va_end (ap);
  51
  52   if (SINGLE_THREAD_P || (cmd != F_SETLKW && cmd != F_SETLKW64))
  53     return INLINE_SYSCALL (fcntl64, 3, fd, cmd, arg);
  54
  55   int oldtype = LIBC_CANCEL_ASYNC ();
  56
  57   int result = INLINE_SYSCALL (fcntl64, 3, fd, cmd, arg);
  58
  59   LIBC_CANCEL_RESET (oldtype);
  60
  61   return result;
  62 }
  63 libc_hidden_def (__libc_fcntl)
  64
  65 weak_alias (__libc_fcntl, __fcntl)
  66 libc_hidden_weak (__fcntl)
  67 weak_alias (__libc_fcntl, fcntl)