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annotate tests/test-sys_wait.h @ 40196:e63f5d3edab5

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relocatable-prog: Update documentation. * doc/relocatable-maint.texi (Supporting Relocation): Update to match the recent changes.
author Bruno Haible <bruno@clisp.org>
date Sun, 24 Feb 2019 01:49:15 +0100
parents b06060465f09
children
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1 /* Test of macros shared between <sys/wait.h> and <stdlib.h>.
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2 Copyright (C) 2010-2019 Free Software Foundation, Inc.
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3
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4 This program is free software: you can redistribute it and/or modify
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5 it under the terms of the GNU General Public License as published by
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6 the Free Software Foundation; either version 3 of the License, or
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7 (at your option) any later version.
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8
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9 This program is distributed in the hope that it will be useful,
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10 but WITHOUT ANY WARRANTY; without even the implied warranty of
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11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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12 GNU General Public License for more details.
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13
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14 You should have received a copy of the GNU General Public License
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15 along with this program. If not, see <https://www.gnu.org/licenses/>. */
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16
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17 /* Written by Eric Blake <ebb9@byu.net>, 2010. */
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18
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19 static int
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20 test_sys_wait_macros (void)
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21 {
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22 /* Check subset of <sys/wait.h> macros that must be visible here.
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23 Note that some of these macros are only portable when operating
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24 on an lvalue. */
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25 int i;
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26 for (i = 0; i < 0x8000; i = (i ? i << 1 : 1))
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27 {
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28 /* POSIX requires that for all valid process statuses, that
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29 exactly one of these three macros is true. But not all
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30 possible 16-bit values map to valid process status.
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31 Traditionally, 8 of the bits are for WIFEXITED, 7 of the bits
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32 to tell between WIFSIGNALED and WIFSTOPPED, and either 0x80
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33 or 0x8000 to flag that core was also dumped. Since we don't
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34 know which byte is WIFEXITED, we skip the both possible bits
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35 that can signal core dump. */
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36 if (i == 0x80)
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37 continue;
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38 if (!!WIFSIGNALED (i) + !!WIFEXITED (i) + !!WIFSTOPPED (i) != 1)
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39 return 1;
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40 }
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41 i = WEXITSTATUS (i) + WSTOPSIG (i) + WTERMSIG (i);
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42
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43 switch (i)
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44 {
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45 #if 0
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46 /* Gnulib doesn't guarantee these, yet. */
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47 case WNOHANG:
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48 case WUNTRACED:
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49 #endif
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50 break;
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51 }
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52 return 0;
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53 }