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1 | /* vi: set sw=4 ts=4: */
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2 | /*
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3 | * Utility routines.
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4 | *
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5 | * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
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6 | *
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7 | * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
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8 | */
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9 |
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10 | #include <sys/utsname.h> /* for uname(2) */
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11 |
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12 | #include "libbb.h"
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13 |
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14 | /* Returns current kernel version encoded as major*65536 + minor*256 + patch,
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15 | * so, for example, to check if the kernel is greater than 2.2.11:
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16 | *
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17 | * if (get_linux_version_code() > KERNEL_VERSION(2,2,11)) { <stuff> }
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18 | */
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19 | int get_linux_version_code(void)
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20 | {
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21 | struct utsname name;
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22 | char *s;
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23 | int i, r;
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24 |
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25 | if (uname(&name) == -1) {
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26 | bb_perror_msg("cannot get system information");
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27 | return 0;
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28 | }
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29 |
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30 | s = name.release;
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31 | r = 0;
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32 | for (i = 0; i < 3; i++) {
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33 | r = r * 256 + atoi(strtok(s, "."));
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34 | s = NULL;
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35 | }
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36 | return r;
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37 | }
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