io/openat.c

   1 /* Copyright (C) 2005, 2006, 2007 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, write to the Free
  16    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  17    02111-1307 USA.  */
  18
  19 #include <errno.h>
  20 #include <fcntl.h>
  21 #include <stdarg.h>
  22 #include <stddef.h>
  23 #include <stdio.h>
  24 #include <sys/stat.h>
  25
  26 /* Open FILE with access OFLAG.  Interpret relative paths relative to
  27    the directory associated with FD.  If OFLAG includes O_CREAT, a
  28    third argument is the file protection.  */
  29 int
  30 __openat (fd, file, oflag)
  31      int fd;
  32      const char *file;
  33      int oflag;
  34 {
  35   int mode;
  36
  37   if (file == NULL)
  38     {
  39       __set_errno (EINVAL);
  40       return -1;
  41     }
  42
  43   if (fd != AT_FDCWD && file[0] != '/')
  44     {
  45       /* Check FD is associated with a directory.  */
  46       struct stat64 st;
  47       if (__fxstat64 (_STAT_VER, fd, &st) != 0)
  48         return -1;
  49
  50       if (!S_ISDIR (st.st_mode))
  51         {
  52           __set_errno (ENOTDIR);
  53           return -1;
  54         }
  55     }
  56
  57   if (oflag & O_CREAT)
  58     {
  59       va_list arg;
  60       va_start (arg, oflag);
  61       mode = va_arg (arg, int);
  62       va_end (arg);
  63     }
  64
  65   __set_errno (ENOSYS);
  66   return -1;
  67 }
  68 libc_hidden_def (__openat)
  69 weak_alias (__openat, openat)
  70 stub_warning (openat)
  71
  72
  73 int
  74 __openat_2 (fd, file, oflag)
  75      int fd;
  76      const char *file;
  77      int oflag;
  78 {
  79   if (oflag & O_CREAT)
  80     __fortify_fail ("invalid openat call: O_CREAT without mode");
  81
  82   return __openat (fd, file, oflag);
  83 }
  84 stub_warning (__openat_2)
  85
  86 #include <stub-tag.h>