// modified p2.c to check child exit status

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/wait.h>

int
main(int argc, char *argv[])
{
    printf("hello world (pid:%d)\n", (int) getpid());
    int rc = fork();
    if (rc < 0) {
        // fork failed; exit
        fprintf(stderr, "fork failed\n");
        exit(1);
    } else if (rc == 0) {
        // child (new process)
        printf("hello, I am child (pid:%d)\n", (int) getpid());
	sleep(1);
	return 123;
    } else {
        // parent goes down this path (original process)
        int wstatus, wc = wait( &wstatus);
        printf("hello, I am parent of %d (wc:%d) (pid:%d)\n",
	       rc, wc, (int) getpid());
	printf( "child exit status = %i\n", WEXITSTATUS(wstatus) );
    }
    return 0;
}

/* sample run:

$ ./p2
hello world (pid:1595)
hello, I am child (pid:1596)
hello, I am parent of 1596 (wc:1596) (pid:1595)
child exit status = 123
$

*/