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/*
Copyright (C) 2001-2003 Paul Davis
Copyright (C) 2004-2006 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.
*/
#include "JackChannel.h"
#include "JackLibGlobals.h"
#include "JackServerLaunch.h"
using namespace Jack;
#ifndef WIN32
/* Exec the JACK server in this process. Does not return. */
static void start_server_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 ret;
snprintf(filename, 255, "%s/.jackdmprc", getenv("HOME"));
fp = fopen(filename, "r");
if (!fp) {
fp = fopen("/etc/jackdmprc", "r");
}
/* if still not found, check old config name for backwards compatability */
if (!fp) {
fp = fopen("/etc/jackdmp.conf", "r");
}
if (fp) {
arguments[0] = '\0';
ret = fscanf(fp, "%s", buffer);
while (ret != 0 && ret != EOF) {
strcat(arguments, buffer);
strcat(arguments, " ");
ret = fscanf(fp, "%s", buffer);
}
if (strlen(arguments) > 0) {
good = 1;
}
}
if (!good) {
command = JACK_LOCATION "/jackdmp";
strncpy(arguments, JACK_LOCATION "/jackdmp -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;
}
}
result = strcspn(arguments + pos, " ");
if (result == 0) {
break;
}
argv[i] = (char*)malloc(result + 1);
strncpy(argv[i], arguments+pos, result);
argv[i][result] = '\0';
pos += result + 1;
++i;
}
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(const char* server_name, jack_options_t options)
{
if ((options & JackNoStartServer) || getenv("JACK_NO_START_SERVER")) {
return 1;
}
/* 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.
*/
switch (fork()) {
case 0: /* child process */
switch (fork()) {
case 0: /* grandchild process */
start_server_aux(server_name);
_exit(99); /* exec failed */
case -1:
_exit(98);
default:
_exit(0);
}
case -1: /* fork() error */
return 1; /* failed to start server */
}
/* only the original parent process goes here */
return 0; /* (probably) successful */
}
int server_connect(char* server_name)
{
JackClientChannelInterface* channel = JackGlobals::MakeClientChannel();
int res = channel->ServerCheck(server_name);
delete channel;
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
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