ubase/fallocate.c

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/* See LICENSE file for copyright and license details. */
#include <sys/stat.h>
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#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
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#include <unistd.h>
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#include "util.h"
static void
usage(void)
{
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eprintf("usage: %s [-o offset] -l length file\n", argv0);
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}
int
main(int argc, char *argv[])
{
int fd;
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off_t size = 0, offset = 0;
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ARGBEGIN {
case 'l':
size = estrtol(EARGF(usage()), 10);
break;
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case 'o':
offset = estrtol(EARGF(usage()), 10);
break;
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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]);
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if (posix_fallocate(fd, offset, size) < 0)
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eprintf("posix_fallocate:");
close(fd);
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return EXIT_SUCCESS;
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}