ubase/fallocate.c

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987 B
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 <limits.h>
#include <stdint.h>
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#include <stdio.h>
#include <stdlib.h>
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#include <unistd.h>
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#include "util.h"
static void
usage(void)
{
eprintf("usage: %s [-o num] -l num file ...\n", argv0);
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}
int
main(int argc, char *argv[])
{
int fd, ret = 0;
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off_t size = 0, offset = 0;
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ARGBEGIN {
case 'l':
size = estrtonum(EARGF(usage()), 1, MIN(LLONG_MAX, SIZE_MAX));
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break;
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case 'o':
offset = estrtonum(EARGF(usage()), 0, MIN(LLONG_MAX, SIZE_MAX));
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break;
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default:
usage();
} ARGEND;
if (!argc || !size)
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usage();
for (; *argv; argc--, argv++) {
if ((fd = open(*argv, O_RDWR | O_CREAT, 0644)) < 0) {
weprintf("open %s:", *argv);
ret = 1;
} else if (posix_fallocate(fd, offset, size) < 0) {
weprintf("posix_fallocate %s:", *argv);
ret = 1;
}
if (fd >= 0 && close(fd) < 0) {
weprintf("close %s:", *argv);
ret = 1;
}
}
return ret;
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}