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#include <stdio.h>
#include <unistd.h>
#include <signal.h>
#include <pthread.h>
#include <assert.h>
#include <sys/wait.h>
void *
slavethread(void *arg)
{
sigset_t sigmask;
if (sigfillset(&sigmask))
{
fprintf(stderr, "Error line %u\n", __LINE__);
_exit(255);
}
if (pthread_sigmask(SIG_UNBLOCK, &sigmask, 0))
{
fprintf(stderr, "Error line %u\n", __LINE__);
_exit(255);
}
while (1)
sleep(1);
}
void
childprocess()
{
pthread_t slave;
if (pthread_create(&slave, 0, &slavethread, 0))
{
fprintf(stderr, "Error line %u\n", __LINE__);
_exit(255);
}
while (1)
sleep(1);
}
int main(int argc, char **argv)
{
sigset_t sigmask;
if (sigfillset(&sigmask))
{
fprintf(stderr, "Error line %u\n", __LINE__);
return 255;
}
if (pthread_sigmask(SIG_BLOCK, &sigmask, 0))
{
fprintf(stderr, "Error line %u\n", __LINE__);
return 255;
}
int childpid = fork();
if (-1 == childpid)
{
fprintf(stderr, "Error line %u\n", __LINE__);
return 255;
}
if ( ! childpid)
childprocess();
if (kill(childpid, SIGTERM))
{
fprintf(stderr, "Error line %u\n", __LINE__);
return 255;
}
int status;
if (childpid != waitpid(childpid, &status, 0))
{
fprintf(stderr, "Error line %u\n", __LINE__);
return 255;
}
assert(WIFSIGNALED(status));
fprintf(stderr, "Signal %d\n", WTERMSIG(status));
assert(WTERMSIG(status) == SIGTERM);
return 0;
}
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