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/* Test of macros shared between <sys/wait.h> and <stdlib.h>.
Copyright (C) 2010-2020 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 <https://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;
}
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