| 1 | /* Test of macros shared between <sys/wait.h> and <stdlib.h>.
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| 2 | Copyright (C) 2010-2012 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 <http://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 | }
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