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

   1 /* Copyright (C) 2011 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, write to the Free
  17    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  18    02111-1307 USA.  */
  19
  20 #include <assert.h>
  21 #include <errno.h>
  22 #include <sysdep-cancel.h>      /* Must come before <fcntl.h>.  */
  23 #include <fcntl.h>
  24 #include <stdarg.h>
  25
  26 #include <sys/syscall.h>
  27 #include <kernel-features.h>
  28
  29
  30 static int
  31 do_fcntl (int fd, int cmd, void *arg)
  32 {
  33   if (cmd != F_GETOWN)
  34     return INLINE_SYSCALL (fcntl64, 3, fd, cmd, arg);
  35
  36   INTERNAL_SYSCALL_DECL (err);
  37   struct f_owner_ex fex;
  38   int res = INTERNAL_SYSCALL (fcntl64, err, 3, fd, F_GETOWN_EX, &fex);
  39   if (!INTERNAL_SYSCALL_ERROR_P (res, err))
  40     return fex.type == F_OWNER_GID ? -fex.pid : fex.pid;
  41
  42   __set_errno (INTERNAL_SYSCALL_ERRNO (res, err));
  43   return -1;
  44 }
  45
  46
  47 #ifndef NO_CANCELLATION
  48 int
  49 __fcntl_nocancel (int fd, int cmd, ...)
  50 {
  51   va_list ap;
  52   void *arg;
  53
  54   va_start (ap, cmd);
  55   arg = va_arg (ap, void *);
  56   va_end (ap);
  57
  58   return do_fcntl (fd, cmd, arg);
  59 }
  60 #endif
  61
  62
  63 int
  64 __libc_fcntl (int fd, int cmd, ...)
  65 {
  66   va_list ap;
  67   void *arg;
  68
  69   va_start (ap, cmd);
  70   arg = va_arg (ap, void *);
  71   va_end (ap);
  72
  73   if (SINGLE_THREAD_P || cmd != F_SETLKW)
  74     return do_fcntl (fd, cmd, arg);
  75
  76   int oldtype = LIBC_CANCEL_ASYNC ();
  77
  78   int result = do_fcntl (fd, cmd, arg);
  79
  80   LIBC_CANCEL_RESET (oldtype);
  81
  82   return result;
  83 }
  84 libc_hidden_def (__libc_fcntl)
  85
  86 weak_alias (__libc_fcntl, __fcntl)
  87 libc_hidden_weak (__fcntl)
  88 weak_alias (__libc_fcntl, fcntl)