sysdeps/unix/sysv/linux/openat.c

   1 /* Copyright (C) 2005-2014 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 <errno.h>
  19 #include <fcntl.h>
  20 #include <stdarg.h>
  21 #include <stddef.h>
  22 #include <stdio.h>
  23 #include <string.h>
  24 #include <sys/stat.h>
  25 #include <sysdep-cancel.h>
  26 #include <not-cancel.h>
  27
  28
  29 #ifndef OPENAT
  30 # define OPENAT openat
  31 #endif
  32
  33
  34 #define OPENAT_NOT_CANCEL CONCAT (OPENAT)
  35 #define CONCAT(name) CONCAT2 (name)
  36 #define CONCAT2(name) __##name##_nocancel
  37
  38
  39 int
  40 OPENAT_NOT_CANCEL (fd, file, oflag, mode)
  41      int fd;
  42      const char *file;
  43      int oflag;
  44      mode_t mode;
  45 {
  46
  47   /* We have to add the O_LARGEFILE flag for openat64.  */
  48 #ifdef MORE_OFLAGS
  49   oflag |= MORE_OFLAGS;
  50 #endif
  51
  52   return INLINE_SYSCALL (openat, 4, fd, file, oflag, mode);
  53 }
  54
  55 #define UNDERIZE(name) UNDERIZE_1 (name)
  56 #define UNDERIZE_1(name) __##name
  57 #define __OPENAT UNDERIZE (OPENAT)
  58
  59
  60 /* Open FILE with access OFLAG.  Interpret relative paths relative to
  61    the directory associated with FD.  If OFLAG includes O_CREAT, a
  62    third argument is the file protection.  */
  63 int
  64 __OPENAT (fd, file, oflag)
  65      int fd;
  66      const char *file;
  67      int oflag;
  68 {
  69   mode_t mode = 0;
  70   if (oflag & O_CREAT)
  71     {
  72       va_list arg;
  73       va_start (arg, oflag);
  74       mode = va_arg (arg, mode_t);
  75       va_end (arg);
  76     }
  77
  78   if (SINGLE_THREAD_P)
  79     return OPENAT_NOT_CANCEL (fd, file, oflag, mode);
  80
  81   int oldtype = LIBC_CANCEL_ASYNC ();
  82
  83   int res = OPENAT_NOT_CANCEL (fd, file, oflag, mode);
  84
  85   LIBC_CANCEL_RESET (oldtype);
  86
  87   return res;
  88 }
  89 libc_hidden_def (__OPENAT)
  90 weak_alias (__OPENAT, OPENAT)