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/*
* debug-launchpad
*
* Copyright (c) 2000 - 2011 Samsung Electronics Co., Ltd. All rights reserved.
*
* Contact: Jungmin Cho <chivalry.cho@samsung.com>, Gwangho Hwang <gwang.hwang@samsung.com>
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*/
#include <pthread.h>
#include "app_signal.h"
static struct sigaction old_sigchild;
static DBusConnection *bus = NULL;
sigset_t oldmask;
static inline void __socket_garbage_collector()
{
DIR *dp;
struct dirent *dentry;
char tmp[MAX_LOCAL_BUFSZ];
dp = opendir(AUL_SOCK_PREFIX);
if (dp == NULL)
return;
while ((dentry = readdir(dp)) != NULL) {
if (!isdigit(dentry->d_name[0]))
continue;
snprintf(tmp, MAX_LOCAL_BUFSZ, "/proc/%s", dentry->d_name);
if (access(tmp, F_OK) < 0) { /* Flawfinder: ignore */
snprintf(tmp, MAX_LOCAL_BUFSZ, "%s/%s", AUL_SOCK_PREFIX,
dentry->d_name);
unlink(tmp);
continue;
}
}
closedir(dp);
}
static inline int __send_app_dead_signal(int dead_pid)
{
DBusMessage *message;
if (bus == NULL)
return -1;
message = dbus_message_new_signal(AUL_DBUS_PATH,
AUL_DBUS_SIGNAL_INTERFACE,
AUL_DBUS_APPDEAD_SIGNAL);
if (dbus_message_append_args(message,
DBUS_TYPE_UINT32, &dead_pid,
DBUS_TYPE_INVALID) == FALSE) {
_E("Failed to load data error");
return -1;
}
if (dbus_connection_send(bus, message, NULL) == FALSE) {
_E("dbus send error");
return -1;
}
dbus_connection_flush(bus);
dbus_message_unref(message);
_D("send dead signal done\n");
return 0;
}
static inline int __send_app_launch_signal(int launch_pid)
{
DBusMessage *message;
if (bus == NULL)
return -1;
message = dbus_message_new_signal(AUL_DBUS_PATH,
AUL_DBUS_SIGNAL_INTERFACE,
AUL_DBUS_APPLAUNCH_SIGNAL);
if (dbus_message_append_args(message,
DBUS_TYPE_UINT32, &launch_pid,
DBUS_TYPE_INVALID) == FALSE) {
_E("Failed to load data error");
return -1;
}
if (dbus_connection_send(bus, message, NULL) == FALSE) {
_E("dbus send error");
return -1;
}
dbus_connection_flush(bus);
dbus_message_unref(message);
_D("send launch signal done\n");
return 0;
}
static int __sigchild_action(void *data)
{
pid_t dead_pid;
char buf[MAX_LOCAL_BUFSZ];
dead_pid = (pid_t) data;
if (dead_pid <= 0)
goto end;
__send_app_dead_signal(dead_pid);
snprintf(buf, MAX_LOCAL_BUFSZ, "%s/%d", AUL_SOCK_PREFIX, dead_pid);
unlink(buf);
__socket_garbage_collector();
end:
return 0;
}
static void __launchpad_sig_child(int signo, siginfo_t *info, void *data)
{
int status;
pid_t child_pid;
pid_t child_pgid;
child_pgid = getpgid(info->si_pid);
_D("dead_pid = %d pgid = %d", info->si_pid, child_pgid);
while ((child_pid = waitpid(-1, &status, WNOHANG)) > 0) {
if (child_pid == child_pgid)
killpg(child_pgid, SIGKILL);
__sigchild_action((void *)child_pid);
}
return;
}
static inline int __signal_init(void)
{
int i;
for (i = 0; i < _NSIG; i++) {
switch (i) {
/* controlled by sys-assert package*/
case SIGQUIT:
case SIGILL:
case SIGABRT:
case SIGBUS:
case SIGFPE:
case SIGSEGV:
case SIGPIPE:
break;
default:
signal(i, SIG_DFL);
break;
}
}
return 0;
}
static inline int __signal_set_sigchld(void)
{
struct sigaction act;
DBusError error;
dbus_error_init(&error);
dbus_threads_init_default();
bus = dbus_bus_get_private(DBUS_BUS_SYSTEM, &error);
if (!bus) {
_E("Failed to connect to the D-BUS daemon: %s", error.message);
dbus_error_free(&error);
return -1;
}
/* TODO: if process stop mechanism is included,
should be modified (SA_NOCLDSTOP)*/
act.sa_handler = NULL;
act.sa_sigaction = __launchpad_sig_child;
sigemptyset(&act.sa_mask);
act.sa_flags = SA_NOCLDSTOP | SA_SIGINFO;
if (sigaction(SIGCHLD, &act, &old_sigchild) < 0)
return -1;
return 0;
}
static inline int __signal_unset_sigchld(void)
{
struct sigaction dummy;
if (bus == NULL)
return 0;
dbus_connection_close(bus);
if (sigaction(SIGCHLD, &old_sigchild, &dummy) < 0)
return -1;
return 0;
}
static inline int __signal_block_sigchld(void)
{
sigset_t newmask;
sigemptyset(&newmask);
sigaddset(&newmask, SIGCHLD);
if (sigprocmask(SIG_BLOCK, &newmask, &oldmask) < 0) {
_E("SIG_BLOCK error");
return -1;
}
_D("SIGCHLD blocked");
return 0;
}
static inline int __signal_unblock_sigchld(void)
{
if(sigprocmask(SIG_SETMASK, &oldmask, NULL) < 0) {
_E("SIG_SETMASK error");
return -1;
}
_D("SIGCHLD unblocked");
return 0;
}
static inline int __signal_fini(void)
{
#ifndef PRELOAD_ACTIVATE
int i;
for (i = 0; i < _NSIG; i++)
signal(i, SIG_DFL);
#endif
return 0;
}
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