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/* Test for SEM_VALUE_MAX overflow detection: BZ #18434.
Copyright (C) 2015-2025 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#include <errno.h>
#include <limits.h>
#include <semaphore.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
static int
do_test (void)
{
sem_t s;
if (sem_init (&s, 0, SEM_VALUE_MAX))
{
printf ("sem_init: %m\n");
return 1;
}
int result = 0;
int value = 0xdeadbeef;
if (sem_getvalue (&s, &value))
{
printf ("sem_getvalue: %m\n");
result = 1;
}
else
{
printf ("sem_getvalue after init: %d\n", value);
if (value != SEM_VALUE_MAX)
{
printf ("\tshould be %d\n", SEM_VALUE_MAX);
result = 1;
}
}
errno = 0;
if (sem_post(&s) == 0)
{
puts ("sem_post at SEM_VALUE_MAX succeeded!");
result = 1;
}
else
{
printf ("sem_post at SEM_VALUE_MAX: %m (%d)\n", errno);
if (errno != EOVERFLOW)
{
printf ("\tshould be %s (EOVERFLOW = %d)\n",
strerror (EOVERFLOW), EOVERFLOW);
result = 1;
}
}
value = 0xbad1d00d;
if (sem_getvalue (&s, &value))
{
printf ("sem_getvalue: %m\n");
result = 1;
}
else
{
printf ("sem_getvalue after post: %d\n", value);
if (value != SEM_VALUE_MAX)
{
printf ("\tshould be %d\n", SEM_VALUE_MAX);
result = 1;
}
}
if (sem_destroy (&s))
{
printf ("sem_destroy: %m\n");
result = 1;
}
return result;
}
#define TEST_FUNCTION do_test ()
#include "../test-skeleton.c"
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