#include "types.h" #include "stat.h" #include "user.h" #include "fs.h" #include "fcntl.h" // init: The initial user-level program char *sh_args[] = { "sh", 0 }; int main(void) { int pid, wpid; if(open("console", O_RDWR) < 0){ mknod("console", T_DEV, 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", sh_args); printf(1, "init: exec sh failed\n"); exit(); } while((wpid=wait()) >= 0 && wpid != pid) printf(1, "zombie!\n"); } }