/*
 * World's 2nd simplest shell
 */

#include <sys/types.h>
#include <sys/wait.h>
#include <errno.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sysexits.h>
#include <unistd.h>

static void sig_int(int);		/* our signal-catcher */

char *getinput(char *buffer, size_t buflen)
{
    printf("$$ ");
    return fgets(buffer, buflen, stdin);
}

int main(void)
{
    char buf[1024];
    pid_t pid;
    int status;

    if (signal(SIGINT, sig_int) == SIG_ERR) {
	    fprintf(stderr, "signal error: %s\n", strerror(errno));
	    exit(1);
    }

    while (getinput(buf, sizeof(buf))) {
	buf[strlen(buf) - 1] = '\0';

	if((pid=fork()) == -1) {
	    fprintf(stderr, "shell: can't fork: %s\n",
		strerror(errno));
	    continue;
	} else if (pid == 0) {
	    /* child */
	    execlp(buf, buf, (char *)0);
	    fprintf(stderr, "shell: couldn't exec %s: %s\n", buf,
		strerror(errno));
	    exit(EX_DATAERR);
	}

	if ((pid=waitpid(pid, &status, 0)) < 0)
	    fprintf(stderr, "shell: waitpid error: %s\n", 
		strerror(errno));
    }

    exit(EX_OK);
}

void
sig_int(int signo)
{
	printf("\nGotcha!\n");
}