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/*
* Copyright (C) 2010 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 "x11lock.h"
#include "log.h"
#include "util.h"
#include "main.h"
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <signal.h>
#include <unistd.h>
#include <sys/wait.h>
#define X11LOCK_HELPER "pwrtray-xlock"
#define X11LOCK_HELPER_PATH stringify(PREFIX) "/bin/" X11LOCK_HELPER
int block_x11_input(struct x11lock *xl)
{
pid_t pid;
#ifndef FEATURE_XLOCK
# warning "X11 input blocking feature disabled"
logdebug("X11 input blocking feature disabled\n");
return 0;
#endif
if (!xl)
return 0;
if (xl->helper_pid)
return 0;
pid = subprocess_exec(X11LOCK_HELPER_PATH);
if (pid < 0) {
logerr("block_x11_input: Failed to execute '%s'.\n",
X11LOCK_HELPER_PATH);
return -ENOENT;
}
xl->helper_pid = pid;
logdebug("Forked X11 input blocker helper %s (pid=%d)\n",
X11LOCK_HELPER_PATH, (int)pid);
return 0;
}
void unblock_x11_input(struct x11lock *xl)
{
int err;
pid_t pid;
#ifndef FEATURE_XLOCK
return;
#endif
if (!xl)
return;
pid = xl->helper_pid;
if (!pid)
return;
block_signals();
xl->killed = 1;
err = kill(pid, SIGTERM);
if (err) {
logerr("unlock_x11_input: Failed to kill helper process PID %d\n",
(int)pid);
return;
}
unblock_signals();
}
void x11lock_sigchld(struct x11lock *xl, int wait)
{
int status;
pid_t pid, res;
#ifndef FEATURE_XLOCK
return;
#endif
if (!xl)
return;
pid = xl->helper_pid;
if (!pid)
return;
res = waitpid(pid, &status, wait ? 0 : WNOHANG);
if (res < 0) {
if (errno == ECHILD)
return;
logerr("x11lock_sigchld: waitpid failed for PID %d: %s\n",
(int)pid, strerror(errno));
return;
}
if (!xl->killed) {
logerr("x11lock_sigchld: X11 lock helper was "
"murdered by a stranger.\n");
}
xl->helper_pid = 0;
xl->killed = 0;
if (status) {
logerr("x11lock_sigchld: The helper process "
"returned an error code: %d\n", status);
} else {
logdebug("X11 lock helper (pid=%d) terminated\n",
(int)pid);
}
}
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