text: /*
    Test assertion #21 by verifying that adding a sigaction for SIGCHLD
    with the SA_NOCLDWAIT bit set in sigaction.sa_flags will result in
    a child process not transforming into a zombie after death.
  */
  
  
  #include <signal.h>
  #include <stdio.h>
  #include <stdlib.h>
  #include <sys/wait.h>
  #include <unistd.h>
  #include <errno.h>
  #include "posixtest.h"
  
  void handler(int signo LTP_ATTRIBUTE_UNUSED)
  {
  	printf("Caught SIGCHLD\n");
  }
  
  int main(void)
  {
  
  	/* Make sure this flag is supported. */
  #ifndef SA_NOCLDWAIT
  	fprintf(stderr, "SA_NOCLWAIT flag is not available for testing\n");
  	return PTS_UNSUPPORTED;
  #endif
  
  	struct sigaction act;
  
  	act.sa_handler = handler;
  	act.sa_flags = SA_NOCLDWAIT;
  	sigemptyset(&act.sa_mask);
  	sigaction(SIGCHLD, &act, 0);
  
  	if (fork() == 0) {
  		/* child */
  		return 0;
  	} else {
  		/* parent */
  		int s;
  		if (wait(&s) == -1 && errno == ECHILD) {
  			printf("Test PASSED\n");
  			return PTS_PASS;
  		}
  	}
  
  	printf("Test FAILED\n");
  	return PTS_FAIL;
  }
  