sysdeps/mach/hurd/truncate.c

   1 /* Copyright (C) 1991,92,93,94,95,97,98,2004 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 <sys/types.h>
  22 #include <unistd.h>
  23 #include <hurd.h>
  24
  25 /* Truncate FILE_NAME to LENGTH bytes.  */
  26 int
  27 __truncate (file_name, length)
  28      const char *file_name;
  29      off_t length;
  30 {
  31   error_t err;
  32   file_t file = __file_name_lookup (file_name, O_WRITE, 0);
  33
  34   if (file == MACH_PORT_NULL)
  35     return -1;
  36
  37   err = __file_set_size (file, length);
  38   __mach_port_deallocate (__mach_task_self (), file);
  39
  40   if (err)
  41     return __hurd_fail (err);
  42   return 0;
  43 }
  44 weak_alias (__truncate, truncate)