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+/* Test of macros shared between <sys/wait.h> and <stdlib.h>.
+ Copyright (C) 2010-2015 Free Software Foundation, Inc.
+
+ This program is free software: you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 3 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program. If not, see <http://www.gnu.org/licenses/>. */
+
+/* Written by Eric Blake <ebb9@byu.net>, 2010. */
+
+static int
+test_sys_wait_macros (void)
+{
+ /* Check subset of <sys/wait.h> macros that must be visible here.
+ Note that some of these macros are only portable when operating
+ on an lvalue. */
+ int i;
+ for (i = 0; i < 0x8000; i = (i ? i << 1 : 1))
+ {
+ /* POSIX requires that for all valid process statuses, that
+ exactly one of these three macros is true. But not all
+ possible 16-bit values map to valid process status.
+ Traditionally, 8 of the bits are for WIFEXITED, 7 of the bits
+ to tell between WIFSIGNALED and WIFSTOPPED, and either 0x80
+ or 0x8000 to flag that core was also dumped. Since we don't
+ know which byte is WIFEXITED, we skip the both possible bits
+ that can signal core dump. */
+ if (i == 0x80)
+ continue;
+ if (!!WIFSIGNALED (i) + !!WIFEXITED (i) + !!WIFSTOPPED (i) != 1)
+ return 1;
+ }
+ i = WEXITSTATUS (i) + WSTOPSIG (i) + WTERMSIG (i);
+
+ switch (i)
+ {
+#if 0
+ /* Gnulib doesn't guarantee these, yet. */
+ case WNOHANG:
+ case WUNTRACED:
+#endif
+ break;
+ }
+ return 0;
+}