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#include <X11/X.h>
#include <X11/XKBlib.h>
#include <X11/Xlib.h>
#include <X11/keysym.h>
#include <X11/XF86keysym.h>
#include <sys/wait.h>
#include <pty.h>
#include <errno.h>
#include <signal.h>
#include <unistd.h>
#include <termios.h>
#include <string.h>
#include <stdarg.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#define ARRLEN(a) (sizeof(a)/sizeof(*(a)))
static pid_t child_pid = -1;
static int child_fd = -1;
static FILE *child_io = NULL;
static const char *play_arg = "-p";
static bool ptty = false;
static void
die(const char *fmt, ...)
{
va_list ap;
va_start(ap, fmt);
fputs("xf86ctrl: ", stderr);
vfprintf(stderr, fmt, ap);
if (*fmt && fmt[strlen(fmt) - 1] == ':') {
fputc(' ', stderr);
perror(NULL);
} else {
fputc('\n', stderr);
}
va_end(ap);
exit(1);
}
static void
child_exit(int sig)
{
int status, rc;
do {
rc = waitpid(child_pid, &status, 0);
if (rc < 0 && errno == ECHILD) exit(123);
} while (rc < 0 || !WIFEXITED(status) && !WIFSIGNALED(status));
if (WIFSIGNALED(status))
exit(128 + WTERMSIG(status));
exit(WEXITSTATUS(status));
}
int
main(int argc, char **argv)
{
char **arg;
struct termios childterm;
struct winsize ws;
int child_pipe[2];
ssize_t nwrite;
Display *d;
Window win;
XEvent e;
KeySym key;
for (arg = argv + 1; *arg && strcmp(*arg, "--"); arg++) {
if (!strcmp(*arg, "-h") || !strcmp(*arg, "--help")) {
*arg = NULL;
break;
} else if (!strcmp(*arg, "-p")) {
play_arg = *++arg;
} else if (!strcmp(*arg, "-t")) {
ptty = true;
} else {
break;
}
}
if (!*arg) {
fprintf(stderr, "Usage: xf86ctrl [-p PLAY] [-t] CMD [ARGS..]\n");
return 1;
}
signal(SIGCHLD, child_exit);
if (ptty) {
cfmakeraw(&childterm);
ws.ws_col = 80;
ws.ws_row = 40;
child_pid = forkpty(&child_fd, NULL, &childterm, &ws);
if (child_pid < 0) die("forkpty:");
if (!child_pid) {
signal(SIGCHLD, SIG_DFL);
execvp(*arg, arg);
die("execvp:");
}
} else {
pipe(child_pipe);
child_pid = fork();
if (child_pid < 0) die("fork:");
if (!child_pid) {
signal(SIGCHLD, SIG_DFL);
close(1);
close(2);
dup2(child_pipe[0], 0);
close(child_pipe[1]);
close(child_pipe[0]);
execvp(*arg, arg);
die("execvp:");
}
child_fd = child_pipe[1];
close(child_pipe[0]);
}
child_io = fdopen(child_fd, "w");
if (!child_io) die("fdopen:");
d = XOpenDisplay(NULL);
if (!d) die("XOpenDisplay(NULL)");
win = DefaultRootWindow(d);
if (!win) die("XDefaultRootWindow no result");
XGrabKey(d, XKeysymToKeycode(d, XF86XK_AudioNext), 0,
win, False, GrabModeAsync, GrabModeAsync);
XGrabKey(d, XKeysymToKeycode(d, XF86XK_AudioPlay), 0,
win, False, GrabModeAsync, GrabModeAsync);
while (1) {
XNextEvent(d, &e);
if (e.type == KeyPress) {
key = XkbKeycodeToKeysym(d,
(KeyCode) e.xkey.keycode, 0,
!!(e.xkey.state & ShiftMask));
switch (key) {
case XF86XK_AudioNext:
goto exit;
case XF86XK_AudioPlay:
nwrite = fputs(play_arg, child_io);
if (nwrite != strlen(play_arg)) goto exit;
fflush(child_io);
break;
}
}
}
exit:
XCloseDisplay(d);
}
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