/* XI.C
* Copyright (c) 2017, 2018 Jesse McClure <code@jessemcclure.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <stdlib.h>
#include <stdio.h>
#include <signal.h>
#include <unistd.h>
#include <sys/ioctl.h>
#include <sys/wait.h>
#include <linux/limits.h>
#include <linux/vt.h>
static volatile int xrunning = 0;
void handler(int sig) {
if (sig == SIGUSR1) xrunning = 1;
if (sig == SIGCHLD || sig == SIGTERM) xrunning = 0;
}
int server(const char *dpy, const char *tty, const char *xauth) {
const char *xorg = "/usr/lib/Xorg";
int pid;
if ((pid=fork()) < 0) exit(1);
else if (pid > 0) return pid;
signal(SIGTTIN, SIG_IGN);
signal(SIGTTOU, SIG_IGN);
signal(SIGUSR1, SIG_IGN);
execl(xorg, xorg, dpy, tty, "-keeptty", "-nolisten", "tcp", "-quiet", "-auth", xauth, NULL);
_exit(2);
}
int client(const char *dpy, const char *wm, const char *xauth) {
int pid;
if ((pid=fork()) < 0) exit(3);
else if (pid > 0) return pid;
setenv("XAUTHORITY", xauth, 1);
setenv("DISPLAY", dpy, 1);
execlp(wm, wm, NULL);
_exit(4);
}
int main(int argc, const char **argv) {
struct vt_stat vtstat;
if (ioctl(0, VT_GETSTATE, &vtstat)) {
perror("get_vt");
return 1;
}
char dpy[] = { ':', '0' + vtstat.v_active, 0 };
char tty[] = { 'v', 't', '0' + vtstat.v_active, 0 };
char xauth[PATH_MAX];
snprintf(xauth, PATH_MAX, "%s/%s", getenv("HOME"), ".Xauthority");
struct sigaction sa;
sa.sa_handler = handler;
sigemptyset(&sa.sa_mask);
sa.sa_flags = 0;
sigaction(SIGUSR1, &sa, NULL);
sigaction(SIGCHLD, &sa, NULL);
sigaction(SIGTERM, &sa, NULL);
int xpid = server(dpy, tty, xauth);
while (!xrunning) pause();
int cpid = client(dpy, (argc > 1 ? argv[1] : "xterm" ), xauth);
while (xrunning) pause();
kill(cpid, SIGTERM);
waitpid(cpid, NULL, 0);
kill(xpid, SIGTERM);
waitpid(xpid, NULL, 0);
return 0;
}