// init: The initial user-level program

#include "types.h"
#include "stat.h"
#include "user.h"
#include "fcntl.h"

char *argv[] = { "sh", 0 };

int
main(void)
{
    int pid, wpid;
    
    if(open("console", O_RDWR) < 0){
        mknod("console", 1, 1);
        open("console", O_RDWR);
    }
    dup(0);  // stdout
    dup(0);  // stderr
    
    for(;;){
        printf(1, "init: starting sh\n");
        pid = fork();
        if(pid < 0){
            printf(1, "init: fork failed\n");
            exit();
        }
        if(pid == 0){
            exec("sh", argv);
            printf(1, "init: exec sh failed\n");
            exit();
        }
        while((wpid=wait()) >= 0 && wpid != pid)
            printf(1, "zombie!\n");
    }
}