xv6/init.c

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