mirror of
git://sourceware.org/git/glibc.git
synced 2024-11-21 01:12:26 +08:00
45 lines
1.3 KiB
C
45 lines
1.3 KiB
C
/* Truncate a file given by name. Generic POSIX.1 version.
|
|
Copyright (C) 1995-2020 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
|
|
The GNU C Library is free software; you can redistribute it and/or
|
|
modify it under the terms of the GNU Lesser General Public
|
|
License as published by the Free Software Foundation; either
|
|
version 2.1 of the License, or (at your option) any later version.
|
|
|
|
The GNU C Library is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
Lesser General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public
|
|
License along with the GNU C Library; if not, see
|
|
<https://www.gnu.org/licenses/>. */
|
|
|
|
#include <sys/types.h>
|
|
#include <errno.h>
|
|
#include <unistd.h>
|
|
#include <fcntl.h>
|
|
|
|
/* Truncate PATH to LENGTH bytes. */
|
|
int
|
|
__truncate (const char *path, off_t length)
|
|
{
|
|
int fd, ret, save;
|
|
|
|
fd = __open (path, O_WRONLY | (length == 0 ? O_TRUNC : 0));
|
|
if (fd < 0)
|
|
return -1;
|
|
|
|
if (length == 0)
|
|
ret = 0;
|
|
else
|
|
ret = __ftruncate (fd, length);
|
|
save = errno;
|
|
(void) __close (fd);
|
|
if (ret < 0)
|
|
__set_errno (save);
|
|
return ret;
|
|
}
|
|
weak_alias (__truncate, truncate)
|