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annotate toys/other/mkswap.c @ 1539:3e85af1f7e22 draft

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First batch of sed tests. Only good for TEST_HOST=1 at the moment because the test infrastructure itself depends on sed, so if an unfinished sed is in the $PATH it goes boing. But hey, corner cases! I have... more.
author Rob Landley <rob@landley.net>
date Wed, 29 Oct 2014 18:44:33 -0500
parents 786841fdb1e0
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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786841fdb1e0 Reindent to two spaces per level. Remove vi: directives that haven't worked right in years (ubuntu broke its' vim implementation). Remove trailing spaces. Add/remove blank lines. Re-wordwrap in places. Update documentation with new coding style.
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1 /* mkswap.c - Format swap device.
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2 *
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3 * Copyright 2009 Rob Landley <rob@landley.net>
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4
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Elie De Brauwer <eliedebrauwer@gmail.com>
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5 USE_MKSWAP(NEWTOY(mkswap, "<1>1", TOYFLAG_SBIN))
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6
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7 config MKSWAP
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8 bool "mkswap"
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9 default y
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parents: 656
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10 help
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11 usage: mkswap DEVICE
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12
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13 Sets up a Linux swap area on a device or file.
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14 */
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15
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16 #include "toys.h"
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17
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18 void mkswap_main(void)
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19 {
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20 int fd = xopen(*toys.optargs, O_RDWR), pagesize = sysconf(_SC_PAGE_SIZE);
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21 off_t len = fdlength(fd);
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22 unsigned int pages = (len/pagesize)-1, *swap = (unsigned int *)toybuf;
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24 // Write header. Note that older kernel versions checked signature
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25 // on disk (not in cache) during swapon, so sync after writing.
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786841fdb1e0 Reindent to two spaces per level. Remove vi: directives that haven't worked right in years (ubuntu broke its' vim implementation). Remove trailing spaces. Add/remove blank lines. Re-wordwrap in places. Update documentation with new coding style.
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parents: 656
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27 swap[0] = 1;
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parents: 656
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28 swap[1] = pages;
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29 xlseek(fd, 1024, SEEK_SET);
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30 xwrite(fd, swap, 129*sizeof(unsigned int));
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parents: 656
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31 xlseek(fd, pagesize-10, SEEK_SET);
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32 xwrite(fd, "SWAPSPACE2", 10);
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33 fsync(fd);
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35 if (CFG_TOYBOX_FREE) close(fd);
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37 printf("Swapspace size: %luk\n", pages*(unsigned long)(pagesize/1024));
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38 }