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[821] | 1 | /* vi: set sw=4 ts=4: */
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[1765] | 2 | /* mkswap.c - format swap device (Linux v1 only)
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[821] | 3 | *
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[1765] | 4 | * Copyright 2006 Rob Landley <rob@landley.net>
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[821] | 5 | *
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[1765] | 6 | * Licensed under GPL version 2, see file LICENSE in this tarball for details.
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[821] | 7 | */
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| 8 |
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[1765] | 9 | #include "libbb.h"
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[821] | 10 |
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[1765] | 11 | int mkswap_main(int argc, char **argv);
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[821] | 12 | int mkswap_main(int argc, char **argv)
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| 13 | {
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[1765] | 14 | int fd, pagesize;
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| 15 | off_t len;
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| 16 | unsigned int hdr[129];
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[821] | 17 |
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[1765] | 18 | // No options supported.
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[821] | 19 |
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[1765] | 20 | if (argc != 2) bb_show_usage();
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[821] | 21 |
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[1765] | 22 | // Figure out how big the device is and announce our intentions.
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[821] | 23 |
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[1765] | 24 | fd = xopen(argv[1], O_RDWR);
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| 25 | len = fdlength(fd);
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| 26 | pagesize = getpagesize();
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| 27 | printf("Setting up swapspace version 1, size = %"OFF_FMT"d bytes\n",
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| 28 | len - pagesize);
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[821] | 29 |
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[1765] | 30 | // Make a header.
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[821] | 31 |
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[1765] | 32 | memset(hdr, 0, sizeof(hdr));
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| 33 | hdr[0] = 1;
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| 34 | hdr[1] = (len / pagesize) - 1;
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[821] | 35 |
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[1765] | 36 | // Write the header. Sync to disk because some kernel versions check
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| 37 | // signature on disk (not in cache) during swapon.
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[821] | 38 |
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[1765] | 39 | xlseek(fd, 1024, SEEK_SET);
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| 40 | xwrite(fd, hdr, sizeof(hdr));
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| 41 | xlseek(fd, pagesize-10, SEEK_SET);
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| 42 | xwrite(fd, "SWAPSPACE2", 10);
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| 43 | fsync(fd);
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[821] | 44 |
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[1765] | 45 | if (ENABLE_FEATURE_CLEAN_UP) close(fd);
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[821] | 46 |
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[1765] | 47 | return 0;
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[821] | 48 | }
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