sysdeps/mach/hurd/euidaccess.c

   1 /* Test for access to FILE using effective UID and GID.  Hurd version.
   2    Copyright (C) 1991-2014 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   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 <errno.h>
  20 #include <stddef.h>
  21 #include <unistd.h>
  22 #include <fcntl.h>
  23 #include <hurd.h>
  24
  25 int
  26 __euidaccess (file, type)
  27      const char *file;
  28      int type;
  29 {
  30   error_t err;
  31   file_t port;
  32   int allowed, flags;
  33
  34   port = __file_name_lookup (file, 0, 0);
  35   if (port == MACH_PORT_NULL)
  36     return -1;
  37
  38   /* Find out what types of access we are allowed to this file.  */
  39   err = __file_check_access (port, &allowed);
  40   __mach_port_deallocate (__mach_task_self (), port);
  41   if (err)
  42     return __hurd_fail (err);
  43
  44   flags = 0;
  45   if (type & R_OK)
  46     flags |= O_READ;
  47   if (type & W_OK)
  48     flags |= O_WRITE;
  49   if (type & X_OK)
  50     flags |= O_EXEC;
  51
  52   if (flags & ~allowed)
  53     /* We are not allowed all the requested types of access.  */
  54     return __hurd_fail (EACCES);
  55
  56   return 0;
  57 }
  58 weak_alias (__euidaccess, euidaccess)
  59 weak_alias (__euidaccess, eaccess)