example-clients/wait.c

   1 #include <stdio.h>
   2 #include <stdlib.h>
   3 #include <unistd.h>
   4 #include <string.h>
   5 #include <getopt.h>
   6
   7 #include <time.h>
   8
   9 #include <jack/jack.h>
  10
  11 char * my_name;
  12
  13 void
  14 show_usage(void)
  15 {
  16         fprintf(stderr, "\nUsage: %s [options]\n", my_name);
  17         fprintf(stderr, "Check for jack existence, or wait, until it either quits, or gets started\n");
  18         fprintf(stderr, "options:\n");
  19         fprintf(stderr, "        -s, --server <name>   Connect to the jack server named <name>\n");
  20         fprintf(stderr, "        -n, --name <name>     Set client name to <name>\n");
  21         fprintf(stderr, "        -w, --wait            Wait for server to become available\n");
  22         fprintf(stderr, "        -q, --quit            Wait until server is quit\n");
  23         fprintf(stderr, "        -c, --check           Check whether server is running\n");
  24         fprintf(stderr, "        -t, --timeout         Wait timeout in seconds\n");
  25         fprintf(stderr, "        -h, --help            Display this help message\n");
  26         fprintf(stderr, "For more information see http://jackaudio.org/\n");
  27 }
  28
  29 int
  30 main(int argc, char *argv[])
  31 {
  32         jack_client_t *client;
  33         jack_status_t status;
  34         jack_options_t options = JackNoStartServer;
  35         int c;
  36         int option_index;
  37         char *server_name = NULL;
  38         char *client_name = NULL;
  39         int wait_for_start = 0;
  40         int wait_for_quit = 0;
  41         int just_check = 0;
  42         int wait_timeout = 0;
  43         time_t start_timestamp;
  44
  45
  46         struct option long_options[] = {
  47                 { "server", 1, 0, 's' },
  48                 { "wait", 0, 0, 'w' },
  49                 { "name", 1, 0, 'n'},
  50                 { "quit", 0, 0, 'q' },
  51                 { "check", 0, 0, 'c' },
  52                 { "timeout", 1, 0, 't' },
  53                 { "help", 0, 0, 'h' },
  54                 { 0, 0, 0, 0 }
  55         };
  56
  57         my_name = strrchr(argv[0], '/');
  58         if (my_name == 0) {
  59                 my_name = argv[0];
  60         } else {
  61                 my_name ++;
  62         }
  63
  64         while ((c = getopt_long (argc, argv, "s:n:wqct:hv", long_options, &option_index)) >= 0) {
  65                 switch (c) {
  66                 case 's':
  67                         server_name = (char *) malloc (sizeof (char) * (strlen(optarg) + 1));
  68                         strcpy (server_name, optarg);
  69                         options |= JackServerName;
  70                         break;
  71                 case 'n':
  72                         client_name = (char *) malloc (sizeof (char) * (strlen(optarg) + 1));
  73                         strcpy (client_name, optarg);
  74                         break;
  75                 case 'w':
  76                         wait_for_start = 1;
  77                         break;
  78                 case 'q':
  79                         wait_for_quit = 1;
  80                         break;
  81                 case 'c':
  82                         just_check = 1;
  83                         break;
  84                 case 't':
  85                         wait_timeout = atoi(optarg);
  86                         break;
  87                 case 'h':
  88                         show_usage();
  89                         return 1;
  90                         break;
  91                 default:
  92                         show_usage();
  93                         return 1;
  94                         break;
  95                 }
  96         }
  97
  98         /* try to open server in a loop. breaking under certein conditions */
  99
 100         start_timestamp = time(NULL);
 101
 102         while (1) {
 103                 if (client_name) {
 104                         client = jack_client_open (client_name, options, &status, server_name);
 105                 }
 106                 else {
 107                         client = jack_client_open ("wait", options, &status, server_name);
 108                 }
 109                 /* check for some real error and bail out */
 110                 if ((client == NULL) && !(status & JackServerFailed)) {
 111                         fprintf (stderr, "jack_client_open() failed, "
 112                                         "status = 0x%2.0x\n", status);
 113                         return 1;
 114                 }
 115
 116                 if (client == NULL) {
 117                         if (wait_for_quit) {
 118                                 fprintf(stdout, "server is gone\n");
 119                                 break;
 120                         }
 121                         if (just_check) {
 122                                 fprintf(stdout, "not running\n");
 123                                 break;
 124                         }
 125                 } else {
 126                         jack_client_close(client);
 127                         if (wait_for_start) {
 128                                 fprintf(stdout, "server is available\n");
 129                                 break;
 130                         }
 131                         if (just_check) {
 132                                 fprintf(stdout, "running\n");
 133                                 break;
 134                         }
 135                 }
 136                 if (wait_timeout) {
 137                         if ((time(NULL) - start_timestamp) > wait_timeout) {
 138                                 fprintf(stdout, "timeout\n");
 139                                 exit(EXIT_FAILURE);
 140                         }
 141                 }
 142
 143                 // Wait a second, and repeat
 144 #ifdef WIN32
 145                 Sleep(1*1000);
 146 #else
 147                 sleep(1);
 148 #endif
 149         }
 150
 151         exit(0);
 152 }