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glibc  2.9
truncate.c
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00001 /* Copyright (C) 1991,92,93,94,95,97,98,2004 Free Software Foundation, Inc.
00002    This file is part of the GNU C Library.
00003 
00004    The GNU C Library is free software; you can redistribute it and/or
00005    modify it under the terms of the GNU Lesser General Public
00006    License as published by the Free Software Foundation; either
00007    version 2.1 of the License, or (at your option) any later version.
00008 
00009    The GNU C Library is distributed in the hope that it will be useful,
00010    but WITHOUT ANY WARRANTY; without even the implied warranty of
00011    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00012    Lesser General Public License for more details.
00013 
00014    You should have received a copy of the GNU Lesser General Public
00015    License along with the GNU C Library; if not, write to the Free
00016    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
00017    02111-1307 USA.  */
00018 
00019 #include <errno.h>
00020 #include <fcntl.h>
00021 #include <sys/types.h>
00022 #include <unistd.h>
00023 #include <hurd.h>
00024 
00025 /* Truncate FILE_NAME to LENGTH bytes.  */
00026 int
00027 __truncate (file_name, length)
00028      const char *file_name;
00029      off_t length;
00030 {
00031   error_t err;
00032   file_t file = __file_name_lookup (file_name, O_WRITE, 0);
00033 
00034   if (file == MACH_PORT_NULL)
00035     return -1;
00036 
00037   err = __file_set_size (file, length);
00038   __mach_port_deallocate (__mach_task_self (), file);
00039 
00040   if (err)
00041     return __hurd_fail (err);
00042   return 0;
00043 }
00044 weak_alias (__truncate, truncate)