It turns out I had the same issue as Rio, since my login shell was still
controlling my terminal. If I run:
exec s6-setsid X :3 vt3
while logged into tty3, I get an X display. However, I still can't
seem to get it to work with s6-svscan. If I exec into s6-svscan from
my login shell, svscan then controls the tty. If I exec into s6-setsid
s6-svscan, it still seems attached to the tty. I thought that maybe
using the tiocnotty ioctl call would free the tty for X to pick up,
so I wrote the following wrapper program:
#include <fcntl.h>
#include <sys/ioctl.h>
#include <stdio.h>
#include <unistd.h>
int main(int argc, char **argv) {
int tty = open("/dev/tty", O_RDONLY);
int res = ioctl(tty, TIOCNOTTY);
if(!~res) perror("tiocnotty");
argv++;
execvp(*argv, argv);
return 0;
}
and tried to exec into that before s6-svscan, both with and without
s6-setsid. Unfortunately, the process immediately exits. I don't think
it's my wrapper program, since I can run other programs with it without
problems, and they do indeed show up in the output of ps aux without a
controlling terminal.
So I guess the new question is how can I free the tty after login,
allowing X to open it and control it?
Thanks so much for your help!
--Dallin
