sysdeps/mach/hurd/truncate.c

   1 /* Copyright (C) 1991, 1992, 1993, 1994, 1995 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 Library General Public License as
   6 published by the Free Software Foundation; either version 2 of the
   7 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 Library General Public License for more details.
  13
  14 You should have received a copy of the GNU Library General Public
  15 License along with the GNU C Library; see the file COPYING.LIB.  If
  16 not, write to the Free Software Foundation, Inc., 675 Mass Ave,
  17 Cambridge, MA 02139, USA.  */
  18
  19 #include <ansidecl.h>
  20 #include <sys/types.h>
  21 #include <errno.h>
  22 #include <hurd.h>
  23 #include <fcntl.h>
  24
  25 /* Truncate FILE_NAME to LENGTH bytes.  */
  26 int
  27 DEFUN(truncate, (file_name, length),
  28       CONST char *file_name AND off_t length)
  29 {
  30   error_t err;
  31   file_t file = __file_name_lookup (file_name, O_WRITE, 0);
  32
  33   if (file == MACH_PORT_NULL)
  34     return -1;
  35
  36   err = __file_set_size (file, length);
  37   __mach_port_deallocate (__mach_task_self (), file);
  38
  39   if (err)
  40     return __hurd_fail (err);
  41   return 0;
  42 }