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annotate toys/other/truncate.c @ 1523:e5b52720f539 draft

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Use O_CLOEXEC instead of O_RDONLY to signal loopfiles_rw() to close filehandles.
author Rob Landley <rob@landley.net>
date Tue, 14 Oct 2014 14:16:34 -0500
parents 6cc69be43c42
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 /* truncate.c - set file length, extending sparsely if necessary
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2 *
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3 * Copyright 2011 Rob Landley <rob@landley.net>
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4
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5 USE_TRUNCATE(NEWTOY(truncate, "<1s#|c", TOYFLAG_BIN))
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6
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7 config TRUNCATE
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8 bool "truncate"
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9 default y
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10 help
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11 usage: truncate [-c] -s file...
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12
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13 Set length of file(s), extending sparsely if necessary.
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14
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15 -c Don't create file if it doesn't exist.
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16 -s New size
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17 */
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18
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7e846e281e38 New build infrastructure to generate FLAG_ macros and TT alias, #define FOR_commandname before #including toys.h to trigger it. Rename DEFINE_GLOBALS() to just GLOBALS() (because I could never remember if it was DECLARE_GLOBALS). Convert existing commands to use new infrastructure, and replace optflag constants with FLAG_ macros where appropriate.
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19 #define FOR_truncate
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20 #include "toys.h"
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21
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22 GLOBALS(
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23 long size;
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24 )
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25
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26 static void do_truncate(int fd, char *name)
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27 {
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28 if (fd<0) return;
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29 if (ftruncate(fd, TT.size)) perror_msg("'%s' to '%ld'", name, TT.size);
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30 }
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31
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32 void truncate_main(void)
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33 {
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34 int cr = !(toys.optflags&1);
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35
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36 // Create files with mask rwrwrw.
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parents: 674
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37 // Nonexistent files are only an error if we're supposed to create them.
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e5b52720f539 Use O_CLOEXEC instead of O_RDONLY to signal loopfiles_rw() to close filehandles.
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38 loopfiles_rw(toys.optargs, O_WRONLY|O_CLOEXEC|(cr ? O_CREAT : 0), 0666, cr,
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39 do_truncate);
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40 }