#include        <sys/types.h>
#include        <sys/wait.h>
#include        <signal.h>
#include        <stdio.h>
#include        <stdlib.h>

static void     sig_int(int);           /*signal-catching function */
int MAXLINE = 4096;

int
main(void)
{
        char    buf[MAXLINE];
        pid_t   pid;
        int             status;

        if (signal(SIGINT, sig_int) == SIG_ERR)
                printf("signal error");

        printf("shell%% ");  /* print prompt */

        while (fgets(buf, MAXLINE, stdin) != NULL) {
                buf[strlen(buf) - 1] = 0;       /* replace newline with null */

                if ( (pid = fork()) < 0)
                        printf("fork error");

                else if (pid == 0) { /*child*/
                        execlp(buf, buf, (char *) 0);
                        printf("couldn't execute: %s", buf);
                        exit(127);
                }

                /* parent */
                if ( (pid = waitpid(pid, &status, 0)) < 0)
                        printf("waitpid error");
                printf("shell%% ");
        }
        exit(0);
}

void
sig_int(int signo)
{
        printf("interrupt\n");