sysdeps/mach/hurd/euidaccess.c

   1 /* Test for access to FILE using effective UID and GID.  Hurd version.
   2    Copyright (C) 1991-2016 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 (const char *file, int type)
  27 {
  28   error_t err;
  29   file_t port;
  30   int allowed, flags;
  31
  32   port = __file_name_lookup (file, 0, 0);
  33   if (port == MACH_PORT_NULL)
  34     return -1;
  35
  36   /* Find out what types of access we are allowed to this file.  */
  37   err = __file_check_access (port, &allowed);
  38   __mach_port_deallocate (__mach_task_self (), port);
  39   if (err)
  40     return __hurd_fail (err);
  41
  42   flags = 0;
  43   if (type & R_OK)
  44     flags |= O_READ;
  45   if (type & W_OK)
  46     flags |= O_WRITE;
  47   if (type & X_OK)
  48     flags |= O_EXEC;
  49
  50   if (flags & ~allowed)
  51     /* We are not allowed all the requested types of access.  */
  52     return __hurd_fail (EACCES);
  53
  54   return 0;
  55 }
  56 weak_alias (__euidaccess, euidaccess)
  57 weak_alias (__euidaccess, eaccess)