jack2/common/JackServerGlobals.cpp

/*
Copyright (C) 2005 Grame  

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.

  You should have received a copy of the GNU General Public License
  along with this program; if not, write to the Free Software
  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

*/

#include "JackServerGlobals.h"
#include "JackError.h"
#include "shm.h"
#include <getopt.h>

#ifndef WIN32
	#include <dirent.h>
#endif

#define DEFAULT_TMP_DIR "/tmp"
char* jack_tmpdir = DEFAULT_TMP_DIR;
static char* server_name = "default";
static int realtime = 0;
static int client_timeout = 0; /* msecs; if zero, use period size. */
static int realtime_priority = 10;
static int verbose_aux = 0;
static int do_mlock = 1;
static unsigned int port_max = 128;
static int loopback = 0;
static int do_unlock = 0;
static int temporary = 0;

namespace Jack
{

JackServerGlobals* JackServerGlobals::fGlobals = NULL;
long JackServerGlobals::fClientCount = 0;
JackServer* JackServerGlobals::fServer = NULL;

#ifndef WIN32

static char* jack_default_server_name(void)
{
    char *server_name;
    if ((server_name = getenv("JACK_DEFAULT_SERVER")) == NULL)
        server_name = "default";
    return server_name;
}

/* returns the name of the per-user subdirectory of jack_tmpdir */
static char* jack_user_dir(void)
{
    static char user_dir[PATH_MAX] = "";

    /* format the path name on the first call */
    if (user_dir[0] == '\0') {
        snprintf (user_dir, sizeof (user_dir), "%s/jack-%d",
                  jack_tmpdir, getuid ());
    }

    return user_dir;
}

/* returns the name of the per-server subdirectory of jack_user_dir() */

static char* get_jack_server_dir(const char* toto)
{
    static char server_dir[PATH_MAX] = "";

    // format the path name on the first call
    if (server_dir[0] == '\0') {
        snprintf (server_dir, sizeof (server_dir), "%s/%s",
                  jack_user_dir (), server_name);
    }

    return server_dir;
}

static void
jack_cleanup_files (const char *server_name)
{
    DIR *dir;
    struct dirent *dirent;
    char *dir_name = get_jack_server_dir (server_name);

    /* On termination, we remove all files that jackd creates so
     * subsequent attempts to start jackd will not believe that an
     * instance is already running.  If the server crashes or is
     * terminated with SIGKILL, this is not possible.  So, cleanup
     * is also attempted when jackd starts.
     *
     * There are several tricky issues.  First, the previous JACK
     * server may have run for a different user ID, so its files
     * may be inaccessible.  This is handled by using a separate
     * JACK_TMP_DIR subdirectory for each user.  Second, there may
     * be other servers running with different names.  Each gets
     * its own subdirectory within the per-user directory.  The
     * current process has already registered as `server_name', so
     * we know there is no other server actively using that name.
     */

    /* nothing to do if the server directory does not exist */
    if ((dir = opendir (dir_name)) == NULL) {
        return ;
    }

    /* unlink all the files in this directory, they are mine */
    while ((dirent = readdir (dir)) != NULL) {

        char fullpath[PATH_MAX];

        if ((strcmp (dirent->d_name, ".") == 0)
                || (strcmp (dirent->d_name, "..") == 0)) {
            continue;
        }

        snprintf (fullpath, sizeof (fullpath), "%s/%s",
                  dir_name, dirent->d_name);

        if (unlink (fullpath)) {
            jack_error ("cannot unlink `%s' (%s)", fullpath,
                        strerror (errno));
        }
    }

    closedir (dir);

    /* now, delete the per-server subdirectory, itself */
    if (rmdir (dir_name)) {
        jack_error ("cannot remove `%s' (%s)", dir_name,
                    strerror (errno));
    }

    /* finally, delete the per-user subdirectory, if empty */
    if (rmdir (jack_user_dir ())) {
        if (errno != ENOTEMPTY) {
            jack_error ("cannot remove `%s' (%s)",
                        jack_user_dir (), strerror (errno));
        }
    }
}

#endif

int JackServerGlobals::JackStart(jack_driver_desc_t* driver_desc, JSList* driver_params, int sync, int time_out_ms, int rt, int priority, int loopback, int verbose)
{
    JackLog("Jackdmp: sync = %ld timeout = %ld rt = %ld priority = %ld verbose = %ld \n", sync, time_out_ms, rt, priority, verbose);
    fServer = new JackServer(sync, time_out_ms, rt, priority, loopback, verbose);
    int res = fServer->Open(driver_desc, driver_params);
    return (res < 0) ? res : fServer->Start();
}

int JackServerGlobals::JackStop()
{
    fServer->Stop();
    fServer->Close();
    JackLog("Jackdmp: server close\n");
    delete fServer;
    JackLog("Jackdmp: delete server\n");
    return 0;
}

int JackServerGlobals::JackDelete()
{
    delete fServer;
    JackLog("Jackdmp: delete server\n");
    return 0;
}

// Temporary : to test

JackServerGlobals::JackServerGlobals()
{
    jack_driver_desc_t* driver_desc;
    const char *options = "-ad:P:uvshVRL:STFl:t:mn:p:";
    struct option long_options[] = {
                                       { "driver", 1, 0, 'd'
                                       },
                                       { "verbose", 0, 0, 'v' },
                                       { "help", 0, 0, 'h' },
                                       { "port-max", 1, 0, 'p' },
                                       { "no-mlock", 0, 0, 'm' },
                                       { "name", 0, 0, 'n' },
                                       { "unlock", 0, 0, 'u' },
                                       { "realtime", 0, 0, 'R' },
                                       { "loopback", 0, 0, 'L' },
                                       { "realtime-priority", 1, 0, 'P' },
                                       { "timeout", 1, 0, 't' },
                                       { "temporary", 0, 0, 'T' },
                                       { "version", 0, 0, 'V' },
                                       { "silent", 0, 0, 's' },
                                       { "sync", 0, 0, 'S' },
                                       { 0, 0, 0, 0 }
                                   };
    int opt = 0;
    int option_index = 0;
    int seen_driver = 0;
    char *driver_name = NULL;
    char **driver_args = NULL;
    JSList* driver_params;
    int driver_nargs = 1;
    JSList* drivers = NULL;
    char* server_name = NULL;
    int show_version = 0;
    int sync = 0;
    int rc, i;

    int argc = 8;
    //char* argv[] = {"jackdmp", "-R", "-v", "-d", "coreaudio", "-p", "512"};
    char* argv[] = {"jackdmp", "-R", "-S", "-v", "-d", "portaudio", "-p", "512"};

    for (i = 0; i < argc; i++) {
        printf("arg %i %s\n", i, argv[i]);
    }

    opterr = 0;
    while (!seen_driver &&
            (opt = getopt_long(argc, argv, options,
                               long_options, &option_index)) != EOF) {
        switch (opt) {

            case 'd':
                seen_driver = 1;
                driver_name = optarg;
                break;

            case 'v':
                verbose_aux = 1;
                break;

            case 's':
                // jack_set_error_function(silent_jack_error_callback);
                break;

            case 'S':
                sync = 1;
                break;

            case 'n':
                server_name = optarg;
                break;

            case 'm':
                do_mlock = 0;
                break;

            case 'p':
                port_max = (unsigned int)atol(optarg);
                break;

            case 'P':
                realtime_priority = atoi(optarg);
                break;

            case 'R':
                realtime = 1;
                break;

            case 'L':
                loopback = atoi(optarg);
                break;

            case 'T':
                temporary = 1;
                break;

            case 't':
                client_timeout = atoi(optarg);
                break;

            case 'u':
                do_unlock = 1;
                break;

            case 'V':
                show_version = 1;
                break;

            default:
                fprintf(stderr, "unknown option character %c\n",
                        optopt);
                /*fallthru*/
            case 'h':
                //usage(stdout);
                return ;
        }
    }

    drivers = jack_drivers_load (drivers);
    if (!drivers) {
        fprintf (stderr, "jackdmp: no drivers found; exiting\n");
        exit (1);
    }

    driver_desc = jack_find_driver_descriptor (drivers, driver_name);
    if (!driver_desc) {
        fprintf (stderr, "jackdmp: unknown driver '%s'\n", driver_name);
        exit (1);
    }

    if (optind < argc) {
        driver_nargs = 1 + argc - optind;
    } else {
        driver_nargs = 1;
    }

    if (driver_nargs == 0) {
        fprintf (stderr, "No driver specified ... hmm. JACK won't do"
                 " anything when run like this.\n");
        return ;
    }

    driver_args = (char **) malloc (sizeof (char *) * driver_nargs);
    driver_args[0] = driver_name;

    for (i = 1; i < driver_nargs; i++) {
        driver_args[i] = argv[optind++];
    }

    if (jack_parse_driver_params (driver_desc, driver_nargs,
                                  driver_args, &driver_params)) {
        return ;
    }

#ifndef WIN32
    if (server_name == NULL)
        server_name = jack_default_server_name ();
#endif

    rc = jack_register_server (server_name);

    /* clean up shared memory and files from any previous
    * instance of this server name */
    jack_cleanup_shm();
#ifndef WIN32
    jack_cleanup_files(server_name);
#endif

    if (!realtime && client_timeout == 0)
        client_timeout = 500; /* 0.5 sec; usable when non realtime. */

    int res = JackStart(driver_desc, driver_params, sync, client_timeout, realtime, realtime_priority, loopback, verbose_aux);
    if (res < 0) {
        jack_error("Cannot start server... exit");
        JackDelete();
        return ;
    }
}

JackServerGlobals::~JackServerGlobals()
{
    JackLog("~JackServerGlobals\n");
    JackStop();
    jack_cleanup_shm();
#ifndef WIN32
    jack_cleanup_files(server_name);
#endif
    jack_unregister_server(server_name);
}

void JackServerGlobals::Init()
{
    if (fClientCount++ == 0 && !fGlobals) {
        JackLog("JackServerGlobals Init %x\n", fGlobals);
        fGlobals = new JackServerGlobals();
    }
}

void JackServerGlobals::Destroy()
{
    if (--fClientCount == 0 && fGlobals) {
        JackLog("JackServerGlobals Destroy %x\n", fGlobals);
        delete fGlobals;
        fGlobals = NULL;
    }
}

} // end of namespace