sysdeps/mach/hurd/euidaccess.c

   1 /* Test for access to FILE using effective UID and GID.  Hurd version.
   2    Copyright (C) 1991, 1995, 1997 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 Library General Public License as
   7    published by the Free Software Foundation; either version 2 of the
   8    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    Library General Public License for more details.
  14
  15    You should have received a copy of the GNU Library General Public
  16    License along with the GNU C Library; see the file COPYING.LIB.  If not,
  17    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  18    Boston, MA 02111-1307, USA.  */
  19
  20 #include <errno.h>
  21 #include <stddef.h>
  22 #include <unistd.h>
  23 #include <fcntl.h>
  24 #include <hurd.h>
  25
  26 int
  27 __euidaccess (file, type)
  28      const char *file;
  29      int type;
  30 {
  31   error_t err;
  32   file_t port;
  33   int allowed, flags;
  34
  35   port = __file_name_lookup (file, 0, 0);
  36   if (port == MACH_PORT_NULL)
  37     return -1;
  38
  39   /* Find out what types of access we are allowed to this file.  */
  40   err = __file_check_access (port, &allowed);
  41   __mach_port_deallocate (__mach_task_self (), port);
  42   if (err)
  43     return __hurd_fail (err);
  44
  45   flags = 0;
  46   if (type & R_OK)
  47     flags |= O_READ;
  48   if (type & W_OK)
  49     flags |= O_WRITE;
  50   if (type & X_OK)
  51     flags |= O_EXEC;
  52
  53   if (flags & ~allowed)
  54     /* We are not allowed all the requested types of access.  */
  55     return __hurd_fail (EACCES);
  56
  57   return 0;
  58 }
  59 weak_alias (__euidaccess, euidaccess)