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, "        -w, --wait            Wait for server to become available\n");
  21         fprintf(stderr, "        -q, --quit            Wait until server is quit\n");
  22         fprintf(stderr, "        -c, --check           Check wether server is running\n");
  23         fprintf(stderr, "        -t, --timeout         Wait timeout in seconds\n");
  24         fprintf(stderr, "        -h, --help            Display this help message\n");
  25         fprintf(stderr, "For more information see http://jackaudio.org/\n");
  26 }
  27
  28 int
  29 main(int argc, char *argv[])
  30 {
  31         jack_client_t *client;
  32         jack_status_t status;
  33         jack_options_t options = JackNoStartServer;
  34         int c;
  35         int option_index;
  36         char *server_name = NULL;
  37         int wait_for_start = 0;
  38         int wait_for_quit = 0;
  39         int just_check = 0;
  40         int wait_timeout = 0;
  41         time_t start_timestamp;
  42
  43
  44         struct option long_options[] = {
  45                 { "server", 1, 0, 's' },
  46                 { "wait", 0, 0, 'w' },
  47                 { "quit", 0, 0, 'q' },
  48                 { "check", 0, 0, 'c' },
  49                 { "timeout", 1, 0, 't' },
  50                 { "help", 0, 0, 'h' },
  51                 { 0, 0, 0, 0 }
  52         };
  53
  54         my_name = strrchr(argv[0], '/');
  55         if (my_name == 0) {
  56                 my_name = argv[0];
  57         } else {
  58                 my_name ++;
  59         }
  60
  61         while ((c = getopt_long (argc, argv, "s:wqct:hv", long_options, &option_index)) >= 0) {
  62                 switch (c) {
  63                 case 's':
  64                         server_name = (char *) malloc (sizeof (char) * strlen(optarg));
  65                         strcpy (server_name, optarg);
  66                         options |= JackServerName;
  67                         break;
  68                 case 'w':
  69                         wait_for_start = 1;
  70                         break;
  71                 case 'q':
  72                         wait_for_quit = 1;
  73                         break;
  74                 case 'c':
  75                         just_check = 1;
  76                         break;
  77                 case 't':
  78                         wait_timeout = atoi(optarg);
  79                         break;
  80                 case 'h':
  81                         show_usage();
  82                         return 1;
  83                         break;
  84                 default:
  85                         show_usage();
  86                         return 1;
  87                         break;
  88                 }
  89         }
  90
  91         /* try to open server in a loop. breaking under certein conditions */
  92
  93         start_timestamp = time(NULL);
  94
  95         while (1) {
  96                 client = jack_client_open ("wait", options, &status, server_name);
  97                 /* check for some real error and bail out */
  98                 if ((client == NULL) && !(status & JackServerFailed)) {
  99                         fprintf (stderr, "jack_client_open() failed, "
 100                                         "status = 0x%2.0x\n", status);
 101                         return 1;
 102                 }
 103
 104                 if (client == NULL) {
 105                         if (wait_for_quit) {
 106                                 fprintf(stdout, "server is gone\n");
 107                                 break;
 108                         }
 109                         if (just_check) {
 110                                 fprintf(stdout, "not running\n");
 111                                 break;
 112                         }
 113                 } else {
 114                         jack_client_close(client);
 115                         if (wait_for_start) {
 116                                 fprintf(stdout, "server is available\n");
 117                                 break;
 118                         }
 119                         if (just_check) {
 120                                 fprintf(stdout, "running\n");
 121                                 break;
 122                         }
 123                 }
 124                 if (wait_timeout) {
 125                        if ((time(NULL) - start_timestamp) > wait_timeout) {
 126                                fprintf(stdout, "timeout\n");
 127                                break;
 128                        }
 129                 }
 130
 131                 // Wait a second, and repeat
 132                 sleep(1);
 133         }
 134
 135         exit(0);
 136 }