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