mirror of
git://git.suckless.org/ubase
synced 2024-12-18 04:34:43 +00:00
90 lines
1.7 KiB
C
90 lines
1.7 KiB
C
/* See LICENSE file for copyright and license details. */
|
|
#include <sys/stat.h>
|
|
|
|
#include <fcntl.h>
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <unistd.h>
|
|
|
|
#include "util.h"
|
|
|
|
#define SWAP_UUID_LENGTH 16
|
|
#define SWAP_LABEL_LENGTH 16
|
|
#define SWAP_MIN_PAGES 10
|
|
|
|
struct swap_hdr {
|
|
char bootbits[1024];
|
|
unsigned int version;
|
|
unsigned int last_page;
|
|
unsigned int nr_badpages;
|
|
unsigned char uuid[SWAP_UUID_LENGTH];
|
|
char volume_name[SWAP_LABEL_LENGTH];
|
|
unsigned int padding[117];
|
|
unsigned int badpages[1];
|
|
};
|
|
|
|
static void
|
|
usage(void)
|
|
{
|
|
eprintf("usage: %s device\n", argv0);
|
|
}
|
|
|
|
int
|
|
main(int argc, char *argv[])
|
|
{
|
|
int fd;
|
|
unsigned int pages;
|
|
long pagesize;
|
|
struct stat sb;
|
|
char *buf;
|
|
struct swap_hdr *hdr;
|
|
|
|
ARGBEGIN {
|
|
default:
|
|
usage();
|
|
} ARGEND;
|
|
|
|
if (argc < 1)
|
|
usage();
|
|
|
|
pagesize = sysconf(_SC_PAGESIZE);
|
|
if (pagesize <= 0) {
|
|
pagesize = sysconf(_SC_PAGE_SIZE);
|
|
if (pagesize <= 0)
|
|
eprintf("can't determine pagesize\n");
|
|
}
|
|
|
|
fd = open(argv[0], O_RDWR);
|
|
if (fd < 0)
|
|
eprintf("open %s:", argv[0]);
|
|
if (fstat(fd, &sb) < 0)
|
|
eprintf("stat %s:", argv[0]);
|
|
|
|
buf = ecalloc(1, pagesize);
|
|
|
|
pages = sb.st_size / pagesize;
|
|
if (pages < SWAP_MIN_PAGES)
|
|
eprintf("swap space needs to be at least %ldKiB\n",
|
|
SWAP_MIN_PAGES * pagesize / 1024);
|
|
|
|
/* Fill up the swap header */
|
|
hdr = (struct swap_hdr *)buf;
|
|
hdr->version = 1;
|
|
hdr->last_page = pages - 1;
|
|
strncpy(buf + pagesize - 10, "SWAPSPACE2", 10);
|
|
|
|
printf("Setting up swapspace version 1, size = %luKiB\n",
|
|
(pages - 1) * pagesize / 1024);
|
|
|
|
/* Write out the signature page */
|
|
if (write(fd, buf, pagesize) != pagesize)
|
|
eprintf("unable to write signature page\n");
|
|
|
|
fsync(fd);
|
|
close(fd);
|
|
free(buf);
|
|
|
|
return 0;
|
|
}
|