ubase/fallocate.c

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2013-08-16 10:14:55 +00:00
/* See LICENSE file for copyright and license details. */
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include "util.h"
static void
usage(void)
{
eprintf("usage: %s -l length file\n", argv0);
}
int
main(int argc, char *argv[])
{
int fd;
long size;
ARGBEGIN {
case 'l':
size = estrtol(EARGF(usage()), 10);
break;
default:
usage();
} ARGEND;
if (argc != 1 || !size)
usage();
fd = open(argv[0], O_RDWR | O_CREAT, 0644);
if (fd < 0)
eprintf("open %s:", argv[0]);
if (posix_fallocate(fd, 0, size) < 0)
eprintf("posix_fallocate:");
close(fd);
return 0;
}