sysdeps/mach/hurd/truncate.c

   1 /* Copyright (C) 1991-2017 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, see
  16    <http://www.gnu.org/licenses/>.  */
  17
  18 #include <errno.h>
  19 #include <fcntl.h>
  20 #include <sys/types.h>
  21 #include <unistd.h>
  22 #include <hurd.h>
  23
  24 /* Truncate FILE_NAME to LENGTH bytes.  */
  25 int
  26 __truncate (const char *file_name, off_t length)
  27 {
  28   error_t err;
  29   file_t file = __file_name_lookup (file_name, O_WRITE, 0);
  30
  31   if (file == MACH_PORT_NULL)
  32     return -1;
  33
  34   err = __file_set_size (file, length);
  35   __mach_port_deallocate (__mach_task_self (), file);
  36
  37   if (err)
  38     return __hurd_fail (err);
  39   return 0;
  40 }
  41 weak_alias (__truncate, truncate)