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minimal init daemon by rich felker, author of musl libc
#define _XOPEN_SOURCE 700
#include <signal.h>
#include <unistd.h>
int main()
{
sigset_t set;
int status;
if (getpid() != 1) return 1;
sigfillset(&set);
sigprocmask(SIG_BLOCK, &set, 0);
if (fork()) for (;;) wait(&status);
sigprocmask(SIG_UNBLOCK, &set, 0);
setsid();
setpgid(0, 0);
return execve("/etc/rc", (char *[]){ "rc", 0 }, (char *[]){ 0 });
}
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