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annotate toys/mknod.c @ 543:60b97ba66a70

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Extensive semi-gratuitous refactoring: factor out common code, handle euid!=uid and egid!=gid cases. (Note: test suite requires root access, possibly container support.)
author Rob Landley <rob@landley.net>
date Mon, 12 Mar 2012 23:00:28 -0500
parents 9e64ca0e3b79
children
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1 /* vi: set sw=4 ts=4:
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2 *
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3 * mknod.c - make block or character special file
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4 *
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5 * Copyright 2012 Elie De Brauwer <eliedebrauwer@gmail.com>
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6 *
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7 * Not in SUSv3.
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8
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9 USE_MKNOD(NEWTOY(mknod, "<2>4", TOYFLAG_BIN))
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10
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11 config MKNOD
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12 bool "mknod"
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13 default y
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14 help
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15 usage: mknod NAME TYPE [MAJOR MINOR]
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16
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17 Create a special file NAME with a given type, possible types are
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18 b create a block device with the given MAJOR/MINOR
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19 c or u create a character device with the given MAJOR/MINOR
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20 p create a named pipe ignoring MAJOR/MINOR
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21 */
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22
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23 #include "toys.h"
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24
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25 static const char modes_char[] = {'p', 'c', 'u', 'b'};
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26 static const mode_t modes[] = {S_IFIFO, S_IFCHR, S_IFCHR, S_IFBLK};
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27
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28 void mknod_main(void)
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29 {
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30 int major=0, minor=0, type;
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31 char * tmp;
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32 int mode = 0660;
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33
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34 tmp = strchr(modes_char, toys.optargs[1][0]);
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35 if (!tmp)
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36 perror_exit("unknown special device type %c", toys.optargs[1][0]);
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37
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38 type = modes[tmp-modes_char];
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39
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40 if (type == S_IFCHR || type == S_IFBLK) {
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41 if (toys.optc != 4)
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42 perror_exit("creating a block/char device requires major/minor");
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43
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44 major = atoi(toys.optargs[2]);
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45 minor = atoi(toys.optargs[3]);
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46 }
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47
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48 if (mknod(toys.optargs[0], mode | type, makedev(major, minor)))
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49 perror_exit("mknod %s failed", toys.optargs[0]);
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51 }