summaryrefslogtreecommitdiff
path: root/init.c
blob: fbd4497fb93f54c3ea8c73e7f561bee07d99894b (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
#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(;;){
    puts("init: starting sh\n");
    pid = fork();
    if(pid < 0){
      puts("init: fork failed\n");
      exit();
    }
    if(pid == 0){
      exec("sh", sh_args);
      puts("init: exec sh failed\n");
      exit();
    }
    while((wpid=wait()) >= 0 && wpid != pid)
      puts("zombie!\n");
  }
}