source: trunk/third/esound/esd.c @ 18233

#include "esd-server.h"

#include <arpa/inet.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/un.h>
#include <errno.h>
#include <signal.h>
#include <time.h>

#ifndef HAVE_NANOSLEEP
#include <sys/time.h>
#include <sys/types.h>
#include <unistd.h>
#endif

#include <netdb.h>

/* Older resolvers don't have gethostbyname2() */
#ifndef HAVE_GETHOSTBYNAME2
#define gethostbyname2(host, family) gethostbyname((host))
#endif /* HAVE_GETHOSTBYNAME2 */

/*******************************************************************/
/* esd.c - prototypes */
void set_audio_buffer( void *buf, esd_format_t format, int magl, int magr,
                int freq, int speed, int length, long offset );
void clean_exit( int signum );
void reset_signal( int signum );
void reset_daemon( int signum );
int open_listen_socket( const char *hostname, int port );

/*******************************************************************/
/* globals */

int esd_is_owned = 0;           /* start unowned, first client claims it */
int esd_is_locked = 1;          /* if owned, will prohibit foreign sources */
char esd_owner_key[ESD_KEY_LEN]; /* the key that locks the daemon */

int esd_on_standby = 0;         /* set to route ignore incoming audio data */
int esdbg_trace = 0;            /* show warm fuzzy debug messages */
int esdbg_comms = 0;            /* show protocol level debug messages */
int esdbg_mixer = 0;            /* show mixer engine debug messages */

int esd_buf_size_octets = 0;    /* size of audio buffer in bytes */
int esd_buf_size_samples = 0;   /* size of audio buffer in samples */
int esd_sample_size = 0;        /* size of sample in bytes */

int esd_beeps = 1;              /* whether or not to beep on startup */
int listen_socket = -1;         /* socket to accept connections on */
int esd_trustval = -1;          /* -1 be paranoic, 0 trust to owner of ESD_UNIX_SOCKET_DIR */

int esd_autostandby_secs = -1;  /* timeout to release audio device, disabled <0 */
time_t esd_last_activity = 0;   /* seconds since last activity */
int esd_on_autostandby = 0;     /* set when auto paused for auto reawaken */

int esd_use_tcpip = 0;          /* use tcp/ip sockets instead of unix domain */
int esd_terminate = 0;          /* terminate after the last client exits */
int esd_public = 0;             /* allow connects from hosts other than localhost */
int esd_spawnpid = 0;           /* The PID of the process that spawned us (for use by esdlib only) */
int esd_spawnfd = 0;           /* The PID of the process that spawned us (for use by esdlib only) */

static char *programname = NULL;

/*******************************************************************/
/* just to create the startup tones for the fun of it */
void set_audio_buffer( void *buf, esd_format_t format,
                       int magl, int magr,
                       int freq, int speed, int length, long offset )
{
    int i;
    float sample;
    float kf = 2.0 * 3.14 * (float)freq / (float)speed;

    unsigned char *uc_buf = (unsigned char *)buf;
    signed short *ss_buf = (signed short *)buf;

    /* printf( "fmt=%d, ml=%d, mr=%d, freq=%d, speed=%d, len=%ld\n",
       format, magl, magr, freq, speed, length ); */

    switch ( format & ESD_MASK_BITS )
    {
    case ESD_BITS8:
        for ( i = 0 ; i < length ; i+=2 ) {
            sample = sin( (float)(i+offset) * kf );
            uc_buf[i] = 127 + magl * sample;
            uc_buf[i+1] = 127 + magr * sample;
        }
        break;
    case ESD_BITS16:    /* assume same endian */
        for ( i = 0 ; i < length ; i+=2 ) {
            sample = sin( (float)(i+offset) * kf );
            ss_buf[i] = magl * sample;
            ss_buf[i+1] = magr * sample;
        }
        break;
    default:
        fprintf( stderr,
                 "unsupported format for set_audio_buffer: 0x%08x\n",
                 format );
        exit( 1 );
    }


    return;
}

/*******************************************************************/
/* to properly handle signals */

void reset_daemon( int signum )
{
    int tumbler;

    ESDBG_TRACE(
        printf( "(ca) resetting sound daemon on signal %d\n",
                signum ); );

    /* reset the access rights */
    esd_is_owned = 0;
    esd_is_locked = 1;

    /* scramble the stored key */
    srand( time(NULL) );
    for ( tumbler = 0 ; tumbler < ESD_KEY_LEN ; tumbler++ ) {
        esd_owner_key[ tumbler ] = rand() % 256;
    }

    /* close the clients */
    while ( esd_clients_list != NULL )
    {
        erase_client( esd_clients_list );
    }

    /* free samples */
    while ( esd_samples_list != NULL )
    {
        erase_sample( esd_samples_list->sample_id, 1 );
        /* TODO: kill_sample, so it stops playing */
        /* a looping sample will get stuck */
    }

    /* reset next sample id */
    esd_next_sample_id = 1;

    /* reset signal handler, if not called from a signal, no effect */
    signal( SIGHUP, reset_daemon );
}

void clean_exit(int signum) {
    /* just clean up as best we can and terminate from here */
    esd_client_t * client = esd_clients_list;

/*    fprintf( stderr, "received signal %d: terminating...\n", signum );*/

    /* free the sound device */
    esd_audio_close();

    /* close the listening socket */
    close( listen_socket );

    /* close the clients */
    while ( client != NULL )
    {
        close( client->fd );
        client = client->next;
    }
   if (!esd_use_tcpip)
    {
      unlink(ESD_UNIX_SOCKET_NAME);
      rmdir(ESD_UNIX_SOCKET_DIR);
    }


    /* trust the os to clean up the memory for the samples and such */
    exit( 0 );
}

void reset_signal(int signum) {
/*    fprintf( stderr, "received signal %d: resetting...\n", signum );*/
    signal( signum, reset_signal);

    return;
}

static int
esd_connect_unix(void)
{
  struct sockaddr_un socket_unix;
  int socket_out = -1;
  int curstate = 1;

  /* create the socket, and set for non-blocking */
  socket_out = socket( AF_UNIX, SOCK_STREAM, 0 );
  if ( socket_out < 0 )
    return -1;
  /* this was borrowed blindly from the Tcl socket stuff */
  if ( fcntl( socket_out, F_SETFD, FD_CLOEXEC ) < 0 )
    return -1;
  if ( setsockopt( socket_out, SOL_SOCKET, SO_REUSEADDR,
                  &curstate, sizeof(curstate) ) < 0 )
    return -1;
  /* set the connect information */
  socket_unix.sun_family = AF_UNIX;
  strncpy(socket_unix.sun_path, ESD_UNIX_SOCKET_NAME, sizeof(socket_unix.sun_path));
  if ( connect( socket_out,
               (struct sockaddr *) &socket_unix, SUN_LEN(&socket_unix) ) < 0 )
    return -1;
  return socket_out;
}


/*******************************************************************/
/* safely create directory for socket
   Code inspired by trans_mkdir from XFree86 source code
   For more credits see xc/lib/xtrans/Xtransutil.c. */
int
safe_mksocketdir(void)
{
struct stat dir_stats;

#if defined(S_ISVTX)
#define ESD_UNIX_SOCKET_DIR_MODE (S_IRUSR|S_IWUSR|S_IXUSR|\
                                  S_IRGRP|S_IWGRP|S_IXGRP|\
                                  S_IROTH|S_IWOTH|S_IXOTH|S_ISVTX)
#else
#define ESD_UNIX_SOCKET_DIR_MODE (S_IRUSR|S_IWUSR|S_IXUSR|\
                                  S_IRGRP|S_IWGRP|S_IXGRP|\
                                  S_IROTH|S_IWOTH|S_IXOTH)
#endif

  if (mkdir(ESD_UNIX_SOCKET_DIR, ESD_UNIX_SOCKET_DIR_MODE) == 0) {
    if (chmod(ESD_UNIX_SOCKET_DIR, ESD_UNIX_SOCKET_DIR_MODE) != 0) {
      return -1;
    }
    return 0;
  }
  /* If mkdir failed with EEXIST, test if it is a directory with
     the right modes, else fail */
  if (errno == EEXIST) {
#if !defined(S_IFLNK) && !defined(S_ISLNK)
#define lstat(a,b) stat(a,b)
#endif
    if (lstat(ESD_UNIX_SOCKET_DIR, &dir_stats) != 0) {
      return -1;
    }
    if (S_ISDIR(dir_stats.st_mode)) {
      int updateOwner = 0;
      int updateMode = 0;
      int updatedOwner = 0;
      int updatedMode = 0;
      /* Check if the directory's ownership is OK. */
      if ((dir_stats.st_uid != 0) && (dir_stats.st_uid != getuid()))
        updateOwner = 1;
      /*
       * Check if the directory's mode is OK.  An exact match isn't
       * required, just a mode that isn't more permissive than the
       * one requested.
       */
      if ( ~ESD_UNIX_SOCKET_DIR_MODE & (dir_stats.st_mode & ~S_IFMT))
        updateMode = 1;
#if defined(S_ISVTX)
      if ((dir_stats.st_mode & S_IWOTH) && !(dir_stats.st_mode & S_ISVTX))
        updateMode = 1;
#endif
#if defined(HAVE_FCHOWN) && defined(HAVE_FCHMOD)
      /*
       * If fchown(2) and fchmod(2) are available, try to correct the
       * directory's owner and mode.  Otherwise it isn't safe to attempt
       * to do this.
       */
      if (updateMode || updateOwner) {
        int fd = -1;
        struct stat fdir_stats;
        if ((fd = open(ESD_UNIX_SOCKET_DIR, O_RDONLY)) != -1) {
          if (fstat(fd, &fdir_stats) == -1) {
            return esd_trustval;
          }
          /*
           * Verify that we've opened the same directory as was
           * checked above.
           */
          if (!S_ISDIR(fdir_stats.st_mode) ||
              dir_stats.st_dev != fdir_stats.st_dev ||
              dir_stats.st_ino != fdir_stats.st_ino) {
            return esd_trustval;
          }
          if (updateOwner && fchown(fd, getuid(), getgid()) == 0)
            updatedOwner = 1;
          if (updateMode && fchmod(fd, ESD_UNIX_SOCKET_DIR_MODE) == 0)
            updatedMode = 1;
          close(fd);
        }
      }
#endif
      if (updateOwner && !updatedOwner) {
        fprintf(stderr,
                "esd: Failed to fix owner of %s.\n",
              ESD_UNIX_SOCKET_DIR);
        if (esd_trustval) fprintf(stderr, "Try -trust to force esd to start.\n");
        return esd_trustval;
      }
      if (updateMode && !updatedMode) {
        fprintf(stderr, "esd: Failed to fix mode of %s to %04o.\n",
              ESD_UNIX_SOCKET_DIR, ESD_UNIX_SOCKET_DIR_MODE);
        if (esd_trustval) fprintf(stderr, "Try -trust to force esd to start.\n");
        return esd_trustval;
      }
      return 0;
    }
  }
  /* In all other cases, fail */
  return -1;
}

/*******************************************************************/
/* returns the listening socket descriptor */
int open_listen_socket(const char *hostname, int port )
{
    /*********************/
    /* socket test setup */
    struct sockaddr_in socket_addr;
    struct sockaddr_un socket_unix;
    int socket_listen = -1;
    struct linger lin;

        struct hostent *resolved;


    /* create the socket, and set for non-blocking */
    if (esd_use_tcpip)
      socket_listen=socket(AF_INET, SOCK_STREAM, 0);
    else
    {
      if (safe_mksocketdir())
        {
          fprintf(stderr,
                  "esd: Esound sound daemon unable to create unix domain socket:\n"
                  "%s\n"
                  "The socket is not accessible by esd.\n"
                  "Exiting...\n", ESD_UNIX_SOCKET_NAME);
          exit(1);
        }
      else
        {
          if (esd_connect_unix() >= 0)
            {
              /* not allowed access */
              fprintf(stderr,
                      "esd: Esound sound daemon already running or stale UNIX socket\n"
                      "%s\n"
                      "This socket already exists indicating esd is already running.\n"
                      "Exiting...\n", ESD_UNIX_SOCKET_NAME);
              exit(1);
            }
        }
      unlink(ESD_UNIX_SOCKET_NAME);
      socket_listen=socket(AF_UNIX, SOCK_STREAM, 0);
    }
    if (socket_listen < 0)
    {
        fprintf(stderr,"Unable to create socket\n");
        return( -1 );
    }
    if (fcntl(socket_listen, F_SETFL, O_NONBLOCK) < 0)
    {
        fprintf(stderr,"Unable to set socket to non-blocking\n");
        return( -1 );
    }

    /* set socket for linger? */
    lin.l_onoff=1;      /* block a closing socket for 1 second */
    lin.l_linger=100;   /* if data is waiting to be sent */
    if ( setsockopt( socket_listen, SOL_SOCKET, SO_LINGER,
                     &lin, sizeof(struct linger) ) < 0 )
    {
        fprintf(stderr,"Unable to set socket linger value to %d\n",
                lin.l_linger);
        return( -1 );
    }
    {
      int n = 1;
      setsockopt(socket_listen, SOL_SOCKET, SO_REUSEADDR, &n, sizeof(n));
      /* if it fails, so what */
    }

    if (esd_use_tcpip)
    {
      /* set the listening information */
      memset(&socket_addr, 0, sizeof(struct sockaddr_in));
      socket_addr.sin_family = AF_INET;
      socket_addr.sin_port = htons( port );

        /* if hostname is set, bind to its first address */
        if (hostname)
        {
                if (!(resolved=gethostbyname2(hostname, AF_INET)))
                {
                        herror(programname);
                        return -1;
                }
                memcpy(&(socket_addr.sin_addr), resolved->h_addr_list[0], resolved->h_length);
        } else if (esd_public)
                socket_addr.sin_addr.s_addr = htonl( INADDR_ANY );
        else
                socket_addr.sin_addr.s_addr = htonl( INADDR_LOOPBACK );

      if ( bind( socket_listen,
                (struct sockaddr *) &socket_addr,
                sizeof(struct sockaddr_in) ) < 0 )
        {
          fprintf(stderr,"Unable to bind port %d\n", port );
          exit(1);
        }
    }
    else
    {
      mode_t old_umask;

      old_umask = umask(0);
      socket_unix.sun_family=AF_UNIX;
      strncpy(socket_unix.sun_path, ESD_UNIX_SOCKET_NAME, sizeof(socket_unix.sun_path));
      if ( bind( socket_listen,
                (struct sockaddr *) &socket_unix, SUN_LEN(&socket_unix) ) < 0 )
        {
          fprintf(stderr,"Unable to connect to UNIX socket %s\n", ESD_UNIX_SOCKET_NAME);
          if (!esd_use_tcpip)
            {
              unlink(ESD_UNIX_SOCKET_NAME);
              rmdir(ESD_UNIX_SOCKET_DIR);
            }
          exit(1);
        }
      umask(old_umask);
    }
    if (listen(socket_listen,16)<0)
    {
      fprintf(stderr,"Unable to set socket listen buffer length\n");
      if (!esd_use_tcpip)
        {
          unlink(ESD_UNIX_SOCKET_NAME);
          rmdir(ESD_UNIX_SOCKET_DIR);
        }
      exit(1);
    }

    return socket_listen;
}

/*******************************************************************/
/* daemon eats sound data, without playing anything, return boolean ok */
int esd_server_standby(void)
{
    int ok = 1;

    /* only bother if we're not already on standby */
    if ( !esd_on_standby ) {
        ESDBG_TRACE( printf( "setting sound daemon to standby\n" ); );
        
        /* TODO: close down any recorders, too */
        esd_on_standby = 1;
        esd_audio_close();
    }   

    return ok;
}

/*******************************************************************/
/* daemon goes back to playing sound data, returns boolean ok */
int esd_server_resume(void)
{
    int ok = 1;

    /* only bother if we're already on standby */
    if ( esd_on_standby ) {
        
        ESDBG_TRACE( printf( "resuming sound daemon\n" ); );
        
        /* reclaim the audio device */
        if ( esd_audio_open() < 0 ) {
            /* device was busy or something, return error, try  later */
            ok = 0;
        } else {
            /* turn ourselves back on */
            esd_on_standby = 0;
            esd_on_autostandby = 0;
            esd_forced_standby = 0;
        }
    }

    return ok;
}

/*******************************************************************/
int main ( int argc, char *argv[] )
{
    /***************************/
    /* Enlightened sound Daemon */

    int esd_port = ESD_DEFAULT_PORT;
    int length = 0;
    int arg = 0;
    int itmp;

    void *output_buffer = NULL;

    char *hostname=NULL;

    /* begin test scaffolding parameters */
    /* int format = AFMT_U8; AFMT_S16_LE; */
    /* int stereo = 0; */     /* 0=mono, 1=stereo */
    int default_rate = ESD_DEFAULT_RATE, default_buf_size = ESD_BUF_SIZE;
    int i, j, freq=440;
    int magl, magr;

    int first = 1;

    int default_format = ESD_BITS16 | ESD_STEREO;
    /* end test scaffolding parameters */

    programname = *argv;

    /* parse the command line args */
    for ( arg = 1 ; arg < argc ; arg++ ) {
        if ( !strcmp( argv[ arg ], "-d" ) ) {
            if ( ++arg != argc ) {
                esd_audio_device = argv[ arg ];
                if ( !esd_audio_device ) {
                    esd_port = ESD_DEFAULT_PORT;
                    fprintf( stderr, "- could not read device: %s\n",
                             argv[ arg ] );
                }
                fprintf( stderr, "- using device %s\n",
                         esd_audio_device );
            }
        } else if ( !strcmp( argv[ arg ], "-port" ) ) {
            if ( ++arg != argc ) {
                esd_port = atoi( argv[ arg ] );
                if ( !esd_port ) {
                    esd_port = ESD_DEFAULT_PORT;
                    fprintf( stderr, "- could not read port: %s\n",
                             argv[ arg ] );
                }
                fprintf( stderr, "- accepting connections on port %d\n",
                         esd_port );
            }

        } else if ( !strcmp( argv[ arg ], "-bind" ) ) {
            if ( ++arg != argc )
                {
                        hostname = argv[ arg ];
                }
                fprintf( stderr, "- accepting connections on port %d\n",
                         esd_port );
        } else if ( !strcmp( argv[ arg ], "-b" ) ) {
            fprintf( stderr, "- server format: 8 bit samples\n" );
            default_format &= ~ESD_MASK_BITS; default_format |= ESD_BITS8;
        } else if ( !strcmp( argv[ arg ], "-r" ) ) {
            if ( ++arg != argc ) {
                default_rate = atoi( argv[ arg ] );
                if ( !default_rate ) {
                    default_rate = ESD_DEFAULT_RATE;
                    fprintf( stderr, "- could not read rate: %s\n",
                             argv[ arg ] );
                }
                fprintf( stderr, "- server format: sample rate = %d Hz\n",
                         default_rate );
            }
        } else if ( !strcmp( argv[ arg ], "-as" ) ) {
            if ( ++arg != argc ) {
                esd_autostandby_secs = atoi( argv[ arg ] );
                if ( !esd_autostandby_secs ) {
                    esd_autostandby_secs = ESD_DEFAULT_AUTOSTANDBY_SECS;
                    fprintf( stderr, "- could not read autostandby timeout: %s\n",
                             argv[ arg ] );
                }
/*              fprintf( stderr, "- autostandby timeout: %d seconds\n",
                         esd_autostandby_secs );*/
            }
#ifdef ESDBG
        } else if ( !strcmp( argv[ arg ], "-vt" ) ) {
            esdbg_trace = 1;
            fprintf( stderr, "- enabling trace diagnostic info\n" );
        } else if ( !strcmp( argv[ arg ], "-vc" ) ) {
            esdbg_comms = 1;
            fprintf( stderr, "- enabling comms diagnostic info\n" );
        } else if ( !strcmp( argv[ arg ], "-vm" ) ) {
            esdbg_mixer = 1;
            fprintf( stderr, "- enabling mixer diagnostic info\n" );
#endif
        } else if ( !strcmp( argv[ arg ], "-nobeeps" ) ) {
            esd_beeps = 0;
/*          fprintf( stderr, "- disabling startup beeps\n" );*/
        } else if ( !strcmp( argv[ arg ], "-unix" ) ) {
            esd_use_tcpip = 0;
        } else if ( !strcmp( argv[ arg ], "-tcp" ) ) {
            esd_use_tcpip = 1;
        } else if ( !strcmp( argv[ arg ], "-public" ) ) {
            esd_public = 1;
        } else if ( !strcmp( argv[ arg ], "-promiscuous" ) ) {
            esd_is_owned = 1;
            esd_is_locked = 0;
        } else if ( !strcmp( argv[ arg ], "-terminate" ) ) {
            esd_terminate = 1;
        } else if ( !strcmp( argv[ arg ], "-spawnpid" ) ) {
            if ( ++arg < argc )
                esd_spawnpid = atoi( argv[ arg ] );
        } else if ( !strcmp( argv[ arg ], "-spawnfd" ) ) {
            if ( ++arg < argc )
                esd_spawnfd = atoi( argv[ arg ] );
        } else if ( !strcmp( argv[ arg ], "-trust" ) ) {
            esd_trustval = 0;
        } else if ( !strcmp( argv[ arg ], "-v" ) || !strcmp( argv[ arg ], "--version" ) ) {
                fprintf(stderr, "Esound version " VERSION "\n");
                exit (0);
        } else if ( !strcmp( argv[ arg ], "-h" ) || !strcmp( argv[ arg ], "--help" ) ) {
            fprintf( stderr, "Esound version " VERSION "\n\n");
            fprintf( stderr, "Usage: esd [options]\n\n" );
            fprintf( stderr, "  -v --version  print version information\n" );
            fprintf( stderr, "  -d DEVICE     force esd to use sound device DEVICE\n" );
            fprintf( stderr, "  -b            run server in 8 bit sound mode\n" );
            fprintf( stderr, "  -r RATE       run server at sample rate of RATE\n" );
            fprintf( stderr, "  -as SECS      free audio device after SECS of inactivity\n" );
            fprintf( stderr, "  -unix         use unix domain sockets instead of tcp/ip\n" );
            fprintf( stderr, "  -tcp          use tcp/ip sockets instead of unix domain\n" );
            fprintf( stderr, "  -public       make tcp/ip access public (other than localhost)\n" );
            fprintf( stderr, "  -promiscuous  start unlocked and owned (disable authenticaton) NOT RECOMMENDED\n" );
            fprintf( stderr, "  -terminate    terminate esd daemone after last client exits\n" );
            fprintf( stderr, "  -nobeeps      disable startup beeps\n" );
            fprintf( stderr, "  -trust        start esd even if use of %s can be insecure\n",
                     ESD_UNIX_SOCKET_DIR );
#ifdef ESDBG
            fprintf( stderr, "  -vt           enable trace diagnostic info\n" );
            fprintf( stderr, "  -vc           enable comms diagnostic info\n" );
            fprintf( stderr, "  -vm           enable mixer diagnostic info\n" );
#endif
            fprintf( stderr, "  -port PORT   listen for connections at PORT (only for tcp/ip)\n" );
            fprintf( stderr, "  -bind ADDRESS binds to ADDRESS (only for tcp/ip)\n" );
            fprintf( stderr, "\nPossible devices are:  %s\n", esd_audio_devices() );
            exit( 0 );
        } else {
            fprintf( stderr, "unrecognized option: %s\n", argv[ arg ] );
        }
    }

    /* open the listening socket */
  listen_socket = open_listen_socket(hostname, esd_port );
  if ( listen_socket < 0 ) {
    fprintf( stderr, "fatal error opening socket\n" );
    if (!esd_use_tcpip)
      {
        unlink(ESD_UNIX_SOCKET_NAME);
        rmdir(ESD_UNIX_SOCKET_DIR);
      }
    exit( 1 );  
  }

#define ESD_AUDIO_STUFF \
    esd_sample_size = ( (esd_audio_format & ESD_MASK_BITS) == ESD_BITS16 ) \
        ? sizeof(signed short) : sizeof(unsigned char); \
    esd_buf_size_samples = default_buf_size / 2; \
    esd_buf_size_octets = esd_buf_size_samples * esd_sample_size;

    /* start the initializatin process */
/*    printf( "ESound ESD daemon initializing...\n" );*/

    /* set the data size parameters */
    esd_audio_format = default_format;
    esd_audio_rate = default_rate;
    ESD_AUDIO_STUFF;

  /* open and initialize the audio device, /dev/dsp */
  itmp = esd_audio_open();
  if (itmp == -2) { /* Special return value indicates open of device failed, don't bother
                       trying */
    if(esd_spawnpid)
      kill(esd_spawnpid, SIGALRM); /* Startup failed */
    
    if(esd_spawnfd) {
        char c = 0; /* Startup failed */
        write (esd_spawnfd, &c, 1);
    }

    if (!esd_use_tcpip) {
        unlink(ESD_UNIX_SOCKET_NAME);
        rmdir(ESD_UNIX_SOCKET_DIR);
      }
    exit (2);
  } else if ( itmp < 0 ) {
    fprintf(stderr, "Audio device open for 44.1Khz, stereo, 16bit failed\n"
            "Trying 44.1Khz, 8bit stereo.\n");
    /* cant do defaults ... try 44.1 kkz 8bit stereo */
    esd_audio_format = ESD_BITS8 | ESD_STEREO;
    esd_audio_rate = 44100;
    ESD_AUDIO_STUFF;
    if ( esd_audio_open() < 0 ) {
      fprintf(stderr, "Audio device open for 44.1Khz, stereo, 8bit failed\n"

            "Trying 48Khz, 16bit stereo.\n");
    /* cant do defaults ... try 48 kkz 16bit stereo */
    esd_audio_format = ESD_BITS16 | ESD_STEREO;
    esd_audio_rate = 48000;
    ESD_AUDIO_STUFF;
    if ( esd_audio_open() < 0 ) {
      fprintf(stderr, "Audio device open for 48Khz, stereo,16bit failed\n"
              "Trying 22.05Khz, 8bit stereo.\n");
      /* cant do defaults ... try 22.05 kkz 8bit stereo */
      esd_audio_format = ESD_BITS8 | ESD_STEREO;
      esd_audio_rate = 22050;
      ESD_AUDIO_STUFF;
      if ( esd_audio_open() < 0 ) {
        fprintf(stderr, "Audio device open for 22.05Khz, stereo, 8bit failed\n"
                "Trying 44.1Khz, 16bit mono.\n");
        /* cant do defaults ... try 44.1Khz kkz 16bit mono */
        esd_audio_format = ESD_BITS16;
        esd_audio_rate = 44100;
        ESD_AUDIO_STUFF;
        if ( esd_audio_open() < 0 ) {
          fprintf(stderr, "Audio device open for 44.1Khz, mono, 8bit failed\n"
                  "Trying 22.05Khz, 8bit mono.\n");
          /* cant do defaults ... try 22.05 kkz 8bit mono */
          esd_audio_format = ESD_BITS8;
          esd_audio_rate = 22050;
          ESD_AUDIO_STUFF;
          if ( esd_audio_open() < 0 ) {
            fprintf(stderr, "Audio device open for 22.05Khz, mono, 8bit failed\n"
                    "Trying 11.025Khz, 8bit stereo.\n");
            /* cant to defaults ... try 11.025 kkz 8bit stereo */
            esd_audio_format = ESD_BITS8 | ESD_STEREO;
            esd_audio_rate = 11025;
            ESD_AUDIO_STUFF;
            if ( esd_audio_open() < 0 ) {
              fprintf(stderr, "Audio device open for 11.025Khz, stereo, 8bit failed\n"
                      "Trying 11.025Khz, 8bit mono.\n");
              /* cant to defaults ... try 11.025 kkz 8bit mono */
              esd_audio_format = ESD_BITS8;
              esd_audio_rate = 11025;
              ESD_AUDIO_STUFF;
              if ( esd_audio_open() < 0 ) {
                fprintf(stderr, "Audio device open for 11.025Khz, mono, 8bit failed\n"
                        "Trying 8.192Khz, 8bit mono.\n");
                /* cant to defaults ... try 8.192 kkz 8bit mono */
                esd_audio_format = ESD_BITS8;
                esd_audio_rate = 8192;
                ESD_AUDIO_STUFF;
                if ( esd_audio_open() < 0 ) {
                  fprintf(stderr, "Audio device open for 8.192Khz, mono, 8bit failed\n"
                          "Trying 8Khz, 8bit mono.\n");
                  /* cant to defaults ... try 8 kkz 8bit mono */
                  esd_audio_format = ESD_BITS8;
                  esd_audio_rate = 8000;
                  ESD_AUDIO_STUFF;
                  if ( esd_audio_open() < 0 ) {
                    fprintf(stderr, "Sound device inadequate for Esound. Fatal.\n");
                    if (!esd_use_tcpip)
                      {
                        unlink(ESD_UNIX_SOCKET_NAME);
                        rmdir(ESD_UNIX_SOCKET_DIR);
                      }
                    if(esd_spawnpid)
                      kill(esd_spawnpid, SIGALRM); /* Startup failed */

                    if(esd_spawnfd) {
                        char c = 0; /* Startup failed */
                        write (esd_spawnfd, &c, 1);
                    }
                    
                    exit( 1 );
                  }
                }
              }
            }
          }
        }
      }
    }
   }
  }

    /* allocate and zero out buffer */
    output_buffer = (void *) malloc( esd_buf_size_octets );
    memset( output_buffer, 0, esd_buf_size_octets );


    /* install signal handlers for program integrity */
    signal( SIGINT, clean_exit );       /* for ^C */
    signal( SIGTERM, clean_exit );      /* for default kill */
    signal( SIGPIPE, reset_signal );    /* for closed rec/mon clients */
    signal( SIGHUP, reset_daemon );     /* kill -HUP clear ownership */

    /* send some sine waves just to check the sound connection */
    i = 0;
    if ( esd_beeps ) {
        magl = magr = ( (esd_audio_format & ESD_MASK_BITS) == ESD_BITS16)
            ? 30000 : 100;

        for ( freq = 55 ; freq < esd_audio_rate/2 ; freq *= 2, i++ ) {
            /* repeat the freq for a few buffer lengths */
            for ( j = 0 ; j < esd_audio_rate / 4 / esd_buf_size_samples ; j++ ) {
                set_audio_buffer( output_buffer, esd_audio_format,
                                  ( (i%2) ? magl : 0 ),  ( (i%2) ? 0 : magr ),
                                  freq, esd_audio_rate, esd_buf_size_samples,
                                  j * esd_buf_size_samples );
                esd_audio_write( output_buffer, esd_buf_size_octets );
            }
        }
    }

    /* put some stuff in sound driver before pausing */
    esd_audio_write( NULL, 0);

    /* pause the sound output */
    esd_audio_pause();

    /* Startup succeeded */
    if(esd_spawnpid)
      kill(esd_spawnpid, SIGUSR1);

    if(esd_spawnfd) {
        char c = 1; /* Startup succeeded */
        write (esd_spawnfd, &c, 1);
    }

    /* until we kill the daemon */
    while ( 1 )
    {
        /* block while waiting for more clients and new data */
        wait_for_clients_and_data( listen_socket );

        /* accept new connections */
        get_new_clients( listen_socket );


        if ((esd_clients_list == NULL) && (!first) && (esd_terminate)) {
/*        fprintf(stderr, "No clients!\n");*/
          clean_exit(0);
          exit(0);
        }

        /* check for new protocol requests */
        poll_client_requests();
        first = 0;

        /* mix new requests, and output to device */
        refresh_mix_funcs(); /* TODO: set a flag to cue when to do this */
        length = mix_players( output_buffer, esd_buf_size_octets );
        
        /* awaken if on autostandby and doing anything */
        if ( esd_on_autostandby && length && !esd_forced_standby ) {
            ESDBG_TRACE( printf( "stuff to play, waking up.\n" ); );
            esd_server_resume();
        }

        /* we handle this even when length == 0 because a filter could have
         * closed, and we don't want to eat the processor if one did.. */
        if ( esd_filter_list && !esd_on_standby ) {
            length = filter_write( output_buffer, length,
                                   esd_audio_format, esd_audio_rate );
        }
        
        if ( length > 0 /* || esd_monitor */ ) {
            /* do_sleep = 0; */
            if ( !esd_on_standby ) {
                /* standby check goes in here, so esd will eat sound data */
                /* TODO: eat a round of data with a better algorithm */
                /*        this will cause guaranteed timing issues */
                /* TODO: on monitor, why isn't this a buffer of zeroes? */
                /* esd_audio_write( output_buffer, esd_buf_size_octets ); */
                esd_audio_write( output_buffer, length );
                /* esd_audio_flush(); */ /* this is overkill */
                esd_last_activity = time( NULL );
            }
        } else {
            /* should be pausing just fine within wait_for_clients_and_data */
            /* if so, this isn't really needed */

            /* be very quiet, and wait for a wabbit to come along */
#if 0
            if ( !do_sleep ) { ESDBG_TRACE( printf( "pausing in esd.c\n" ); ); }
            do_sleep = 1;
            esd_audio_pause();
#endif
        }

        /* if someone's monitoring the sound stream, send them data */
        /* mix_players, above, forces buffer to zero if no players */
        /* this clears out any leftovers from recording, below */
        if ( esd_monitor_list && !esd_on_standby && length ) {
        /* if ( esd_monitor_list && !esd_on_standby ) {  */
            monitor_write( output_buffer, length );
        }

        /* if someone's recording the sound stream, send them data */
        if ( esd_recorder_list && !esd_on_standby ) {
            length = esd_audio_read( output_buffer, esd_buf_size_octets );
            if ( length ) {
                length = recorder_write( output_buffer, length );
                esd_last_activity = time( NULL );
            }
        }

        if ( esd_on_standby ) {
#ifdef HAVE_NANOSLEEP
            struct timespec restrain;
            restrain.tv_sec = 0;
            /* funky math to make sure a long can hold it all, calulate in ms */
            restrain.tv_nsec = (long) esd_buf_size_samples * 1000L
                / (long) esd_audio_rate / 4L;   /* divide by two for stereo */
            restrain.tv_nsec *= 1000000L;       /* convert to nanoseconds */
            nanosleep( &restrain, NULL );
#else
            struct timeval restrain;
            restrain.tv_sec = 0;
            /* funky math to make sure a long can hold it all, calulate in ms */
            restrain.tv_usec = (long) esd_buf_size_samples * 1000L
                / (long) esd_audio_rate / 4L;   /* divide by two for stereo */
            restrain.tv_usec *= 1000L;          /* convert to microseconds */
            select( 0, 0, 0, 0, &restrain );
#endif
        }
    } /* while ( 1 ) */

    /* how we'd get here, i have no idea, should only exit on signal */
    clean_exit( -1 );
    exit( 0 );
}