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/*
* Copyright (C) 2011 Michael Buesch <m@bues.ch>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <signal.h>
#include <errno.h>
#include <sys/time.h>
#include <X11/Xlib.h>
#include <X11/extensions/XInput2.h>
#define PFX "pwrtray-xevrep: "
static pid_t report_pid;
static int report_signal;
static unsigned int grace_period_ms;
static struct timeval next_report;
int timeval_after(const struct timeval *a, const struct timeval *b)
{
if (a->tv_sec > b->tv_sec)
return 1;
if ((a->tv_sec == b->tv_sec) && (a->tv_usec > b->tv_usec))
return 1;
return 0;
}
void timeval_add_msec(struct timeval *tv, unsigned int msec)
{
unsigned int seconds, usec;
seconds = msec / 1000;
msec = msec % 1000;
usec = msec * 1000;
tv->tv_usec += usec;
while (tv->tv_usec >= 1000000) {
tv->tv_sec++;
tv->tv_usec -= 1000000;
}
tv->tv_sec += seconds;
}
static void report_event(XIDeviceEvent *ev)
{
struct timeval now;
int err;
gettimeofday(&now, NULL);
if (!timeval_after(&now, &next_report))
return;
next_report = now;
timeval_add_msec(&next_report, grace_period_ms);
err = kill(report_pid, report_signal);
if (err) {
fprintf(stderr, PFX
"Failed to send signal %d to process %d: %s\n",
report_signal, report_pid, strerror(errno));
}
}
static void signal_handler(int signal)
{
printf(PFX "terminated\n");
exit(0);
}
static int install_sighandler(int signal, void (*handler)(int))
{
struct sigaction act;
memset(&act, 0, sizeof(act));
sigemptyset(&act.sa_mask);
act.sa_flags = 0;
act.sa_handler = handler;
return sigaction(signal, &act, NULL);
}
static void usage(void)
{
printf("Usage: pwrtray-xevrep PID SIGNAL GRACEPERIOD\n");
}
int main(int argc, char **argv)
{
Display *display;
Window window;
XIEventMask evmask;
unsigned char evmask_bits[(XI_LASTEVENT + 8) / 8] = { 0, };
int res, tmp0, tmp1, xi_opcode;
int pid;
sigset_t sigset;
if (argc != 4) {
usage();
return 1;
}
if (sscanf(argv[1], "%d", &pid) != 1 ||
sscanf(argv[2], "%d", &report_signal) != 1 ||
sscanf(argv[3], "%u", &grace_period_ms) != 1) {
usage();
return 1;
}
report_pid = pid;
display = XOpenDisplay(NULL);
if (!display) {
/* Fallback to the first display. */
display = XOpenDisplay(":0");
if (!display) {
fprintf(stderr, PFX "Failed to open DISPLAY\n");
return 1;
}
}
window = DefaultRootWindow(display);
res = XQueryExtension(display, "XInputExtension", &xi_opcode, &tmp0, &tmp1);
if (!res) {
fprintf(stderr, PFX "X Input extension not available.\n");
return 1;
}
sigemptyset(&sigset);
res = sigprocmask(SIG_SETMASK, &sigset, NULL);
res |= install_sighandler(SIGINT, signal_handler);
res |= install_sighandler(SIGTERM, signal_handler);
if (res) {
fprintf(stderr, PFX "Failed to setup signal handlers\n");
return 1;
}
XISetMask(evmask_bits, XI_DeviceChanged);
XISetMask(evmask_bits, XI_KeyPress);
XISetMask(evmask_bits, XI_KeyRelease);
XISetMask(evmask_bits, XI_RawButtonPress);
XISetMask(evmask_bits, XI_RawButtonRelease);
XISetMask(evmask_bits, XI_Motion);
XISetMask(evmask_bits, XI_HierarchyChanged);
XISetMask(evmask_bits, XI_PropertyEvent);
memset(&evmask, 0, sizeof(evmask));
evmask.deviceid = XIAllDevices;
evmask.mask_len = sizeof(evmask_bits);
evmask.mask = evmask_bits;
res = XISelectEvents(display, window, &evmask, 1);
if (res != Success) {
fprintf(stderr, PFX "Failed to set event mask (%d)\n", res);
return 1;
}
printf(PFX "Monitoring X11 input events...\n");
while (1) {
XEvent ev;
XGenericEventCookie *cookie = &ev.xcookie;
XNextEvent(display, &ev);
if (XGetEventData(display, cookie) &&
cookie->type == GenericEvent &&
cookie->extension == xi_opcode) {
XIDeviceEvent *event = cookie->data;
report_event(event);
}
XFreeEventData(display, cookie);
}
}
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