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[glibc.git] / sysdeps / posix / truncate.c
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1 /* Copyright (C) 1995, 1996 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
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.
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.
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. */
19 #include <sys/types.h>
20 #include <errno.h>
21 #include <unistd.h>
22 #include <fcntl.h>
24 /* Truncate PATH to LENGTH bytes. */
25 int
26 truncate (path, length)
27 const char *path;
28 off_t length;
30 int fd, ret, save;
32 fd = open (path, O_WRONLY);
33 if (fd < 0)
34 return -1;
36 ret = ftruncate (fd, length);
37 save = errno;
38 (void) close (fd);
39 if (ret < 0)
40 __set_errno (save);
41 return ret;