xv6-cs450/init.c

39 lines
658 B
C
Raw Normal View History

#include "types.h"
2006-08-15 17:53:46 +02:00
#include "stat.h"
#include "user.h"
#include "fs.h"
#include "fcntl.h"
2006-09-06 19:50:20 +02:00
// init: The initial user-level program
char *sh_args[] = { "sh", 0 };
int
main(void)
{
2007-08-08 10:39:23 +02:00
int pid, wpid;
2006-09-06 19:27:19 +02:00
2006-08-29 21:06:37 +02:00
if(open("console", O_RDWR) < 0){
mknod("console", T_DEV, 1, 1);
2006-08-29 21:06:37 +02:00
open("console", O_RDWR);
}
2006-09-08 16:36:44 +02:00
dup(0); // stdout
dup(0); // stderr
2006-09-06 20:47:51 +02:00
for(;;){
2007-08-08 10:39:23 +02:00
puts("init: starting sh\n");
pid = fork();
2006-08-29 21:06:37 +02:00
if(pid < 0){
puts("init: fork failed\n");
exit();
}
if(pid == 0){
exec("sh", sh_args);
2006-08-29 21:06:37 +02:00
puts("init: exec sh failed\n");
exit();
2006-08-29 21:06:37 +02:00
}
2007-08-08 10:39:23 +02:00
while((wpid=wait()) >= 0 && wpid != pid)
2007-08-08 10:57:03 +02:00
puts("zombie!\n");
}
}