JackPosixServerLaunch.cpp
/*
Copyright (C) 2001-2003 Paul Davis
Copyright (C) 2004-2008 Grame
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 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 Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#if !defined(WIN32) || defined(__CYGWIN__)
#ifdef PTHREAD_WIN32 // Added by JE - 13-02-2010
#include <ptw32/pthread.h> // Makes sure we #include the ptw32 version for
#endif // consistency - even though we won't need it !
#include "JackConstants.h"
#include "JackChannel.h"
#include "JackLibGlobals.h"
#include "JackServerLaunch.h"
#include "JackPlatformPlug.h"
#include <sys/wait.h>
using namespace Jack;
#if defined(USE_LIBDBUS_AUTOLAUNCH)
#include <dbus/dbus.h>
static int start_server_dbus(const char* server_name)
{
DBusError err;
DBusConnection *conn;
DBusMessage *msg;
// initialise the errors
dbus_error_init(&err);
// connect to the bus
conn = dbus_bus_get(DBUS_BUS_SESSION, &err);
if (dbus_error_is_set(&err)) {
fprintf(stderr, "Connection Error (%s)\n", err.message);
dbus_error_free(&err);
}
if (NULL == conn) {
return 1;
}
msg = dbus_message_new_method_call(
"org.jackaudio.service", // target for the method call
"/org/jackaudio/Controller", // object to call on
"org.jackaudio.JackControl", // interface to call on
"StartServer"); // method name
if (NULL == msg) {
fprintf(stderr, "Message Null\n");
return 1;
}
// send message and get a handle for a reply
if (!dbus_connection_send(conn, msg, NULL))
{
fprintf(stderr, "Out Of Memory!\n");
return 1;
}
dbus_message_unref(msg);
dbus_connection_flush(conn);
dbus_error_free(&err);
return 0;
}
#elif defined(USE_CLASSIC_AUTOLAUNCH)
/* Exec the JACK server in this process. Does not return. */
static void start_server_classic_aux(const char* server_name)
{
FILE* fp = 0;
char filename[255];
char arguments[255];
char buffer[255];
char* command = 0;
size_t pos = 0;
size_t result = 0;
char** argv = 0;
int i = 0;
int good = 0;
int res;
snprintf(filename, 255, "%s/.jackdrc", getenv("HOME"));
fp = fopen(filename, "r");
if (!fp) {
fp = fopen("/etc/jackdrc", "r");
}
/* if still not found, check old config name for backwards compatability */
if (!fp) {
fp = fopen("/etc/jackd.conf", "r");
}
if (fp) {
arguments[0] = '\0';
res = fscanf(fp, "%s", buffer);
while (res != 0 && res != EOF) {
strcat(arguments, buffer);
strcat(arguments, " ");
res = fscanf(fp, "%s", buffer);
}
if (strlen(arguments) > 0) {
good = 1;
}
fclose(fp);
}
if (!good) {
command = (char*)(JACK_LOCATION "/jackd");
strncpy(arguments, JACK_LOCATION "/jackd -T -d " JACK_DEFAULT_DRIVER, 255);
} else {
result = strcspn(arguments, " ");
command = (char*)malloc(result + 1);
strncpy(command, arguments, result);
command[result] = '\0';
}
argv = (char**)malloc(255);
while (1) {
/* insert -T and -nserver_name in front of arguments */
if (i == 1) {
argv[i] = (char*)malloc(strlen ("-T") + 1);
strcpy (argv[i++], "-T");
if (server_name) {
size_t optlen = strlen("-n");
char* buf = (char*)malloc(optlen + strlen(server_name) + 1);
strcpy(buf, "-n");
strcpy(buf + optlen, server_name);
argv[i++] = buf;
}
}
/* skip whitespace */
while (pos < strlen(arguments) && arguments[pos] && arguments[pos] == ' ') {
++pos;
}
if (pos >= strlen(arguments)) {
break;
}
if (arguments[pos] == '\"') {
++pos;
result = strcspn(arguments + pos, "\"");
} else {
result = strcspn(arguments + pos, " ");
}
if (0 == result) {
break;
}
argv[i] = (char*)malloc(result + 1);
strncpy(argv[i], arguments + pos, result);
argv[i][result] = '\0';
pos += result + 1;
if (++i > 253) {
break;
}
}
argv[i] = 0;
execv(command, argv);
/* If execv() succeeds, it does not return. There's no point
* in calling jack_error() here in the child process. */
fprintf(stderr, "exec of JACK server (command = \"%s\") failed: %s\n", command, strerror(errno));
}
static int start_server_classic(const char* server_name)
{
/* The double fork() forces the server to become a child of
* init, which will always clean up zombie process state on
* termination. This even works in cases where the server
* terminates but this client does not.
*
* Since fork() is usually implemented using copy-on-write
* virtual memory tricks, the overhead of the second fork() is
* probably relatively small.
*/
int status;
pid_t first_child_pid;
first_child_pid = fork();
switch (first_child_pid) {
case 0: /* child process */
switch (fork()) {
case 0: /* grandchild process */
start_server_classic_aux(server_name);
_exit(99); /* exec failed */
case - 1:
_exit(98);
default:
_exit(0);
}
case - 1: /* fork() error */
return 1; /* failed to start server */
}
waitpid(first_child_pid, &status, 0);
/* only the original parent process goes here */
return 0; /* (probably) successful */
}
#endif
static int start_server(const char* server_name, jack_options_t options)
{
if ((options & JackNoStartServer) || getenv("JACK_NO_START_SERVER")) {
return 1;
}
#if defined(USE_LIBDBUS_AUTOLAUNCH)
return start_server_dbus(server_name);
#elif defined(USE_CLASSIC_AUTOLAUNCH)
return start_server_classic(server_name);
#else
fprintf(stderr, "Automatic start of JACK server is disabled at configure time\n");
return 1;
#endif
}
static int server_connect(char* server_name)
{
JackClientChannel channel;
int res = channel.ServerCheck(server_name);
channel.Close();
JackSleep(2000); // Added by JE - 02-01-2009 (gives
// the channel some time to close)
return res;
}
int try_start_server(jack_varargs_t* va, jack_options_t options, jack_status_t* status)
{
if (server_connect(va->server_name) < 0) {
int trys;
if (start_server(va->server_name, options)) {
int my_status1 = *status | JackFailure | JackServerFailed;
*status = (jack_status_t)my_status1;
return -1;
}
trys = 5;
do {
sleep(1);
if (--trys < 0) {
int my_status1 = *status | JackFailure | JackServerFailed;
*status = (jack_status_t)my_status1;
return -1;
}
} while (server_connect(va->server_name) < 0);
int my_status1 = *status | JackServerStarted;
*status = (jack_status_t)my_status1;
}
return 0;
}
#endif // !defined(WIN32) || defined(__CYGWIN__)
Jack
Definition: JackAC3Encoder.cpp:30
jack_varargs_t
Definition: varargs.h:34
Jack::JackSocketClientChannel
JackClientChannel using sockets.
Definition: JackSocketClientChannel.h:37