/* 
 * pipe.c: sample program showing how to redirect stdout and process
 * the argument vector.
 *
 * Stefan Brandle, COS 421, February 2000.
 */

#include <stdio.h>
#include <unistd.h>
#include <fcntl.h>

int main( int argc, char *argv[], char *envp[] )
{
    char junk[80];

    int pfd[2];

    if( pipe(pfd) == -1 ) {
	fprintf(stderr, "The pipe failed.\n");
	return 1;
    }

    switch( fork() ) {
	case -1:
		fprintf(stderr, "Fork bombed.\n");
		exit(1);
	case 0: // Child #2
		if( dup2(pfd[0],0) == -1 ) {
			fprintf(stderr, "Child 2 dup2 failed\n");
			exit(1);
		}
		close(pfd[0]);
		close(pfd[1]);
		gets(junk);
		printf("Child 2: got message => %s\n", junk);
		break;
	default: // Child #1
		if( dup2(pfd[1],1) == -1 ) {
			fprintf(stderr, "Child 1 dup2 failed\n");
			exit(1);
		}
		close(pfd[0]);
		close(pfd[1]);
		printf("Hi to child #2");
		break;
	}
}