ports/sysdeps/unix/sysv/linux/generic/wordsize-32/fcntl.c

   1 /* Copyright (C) 2011-2014 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3    Contributed by Chris Metcalf <cmetcalf@tilera.com>, 2011.
   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 <assert.h>
  20 #include <errno.h>
  21 #include <sysdep-cancel.h>      /* Must come before <fcntl.h>.  */
  22 #include <fcntl.h>
  23 #include <stdarg.h>
  24
  25 #include <sys/syscall.h>
  26 #include <kernel-features.h>
  27
  28
  29 static int
  30 do_fcntl (int fd, int cmd, void *arg)
  31 {
  32   if (cmd != F_GETOWN)
  33     return INLINE_SYSCALL (fcntl64, 3, fd, cmd, arg);
  34
  35   INTERNAL_SYSCALL_DECL (err);
  36   struct f_owner_ex fex;
  37   int res = INTERNAL_SYSCALL (fcntl64, err, 3, fd, F_GETOWN_EX, &fex);
  38   if (!INTERNAL_SYSCALL_ERROR_P (res, err))
  39     return fex.type == F_OWNER_GID ? -fex.pid : fex.pid;
  40
  41   __set_errno (INTERNAL_SYSCALL_ERRNO (res, err));
  42   return -1;
  43 }
  44
  45
  46 #ifndef NO_CANCELLATION
  47 int
  48 __fcntl_nocancel (int fd, int cmd, ...)
  49 {
  50   va_list ap;
  51   void *arg;
  52
  53   va_start (ap, cmd);
  54   arg = va_arg (ap, void *);
  55   va_end (ap);
  56
  57   return do_fcntl (fd, cmd, arg);
  58 }
  59 #endif
  60
  61
  62 int
  63 __libc_fcntl (int fd, int cmd, ...)
  64 {
  65   va_list ap;
  66   void *arg;
  67
  68   va_start (ap, cmd);
  69   arg = va_arg (ap, void *);
  70   va_end (ap);
  71
  72   if (SINGLE_THREAD_P || cmd != F_SETLKW)
  73     return do_fcntl (fd, cmd, arg);
  74
  75   int oldtype = LIBC_CANCEL_ASYNC ();
  76
  77   int result = do_fcntl (fd, cmd, arg);
  78
  79   LIBC_CANCEL_RESET (oldtype);
  80
  81   return result;
  82 }
  83 libc_hidden_def (__libc_fcntl)
  84
  85 weak_alias (__libc_fcntl, __fcntl)
  86 libc_hidden_weak (__fcntl)
  87 weak_alias (__libc_fcntl, fcntl)