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annotate mgw/main.c @ 127:f062c32a5116

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mgw: implement DTMF
author Mychaela Falconia <falcon@freecalypso.org>
date Sat, 01 Oct 2022 20:31:15 -0800
parents 815e4c59162e
children a6eb2de277f6
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1 /*
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2 * Main module for themwi-mgw.
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3 */
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4
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5 #include <sys/types.h>
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6 #include <sys/time.h>
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7 #include <sys/errno.h>
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8 #include <stdio.h>
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9 #include <stdint.h>
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10 #include <stdlib.h>
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11 #include <string.h>
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12 #include <strings.h>
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13 #include <signal.h>
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14 #include <syslog.h>
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15 #include <unistd.h>
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16
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17 extern int dtmf_timer_running;
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18 extern struct timeval dtmf_next_time;
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19
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20 fd_set select_for_read;
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21 void (*select_handlers[FD_SETSIZE])();
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22 void *select_data[FD_SETSIZE];
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23 struct timeval cur_event_time;
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24
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25 static int max_fd;
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26
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27 update_max_fd(newfd)
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28 {
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29 if (newfd >= FD_SETSIZE) {
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30 syslog(LOG_CRIT, "FATAL: file descriptor %d >= FD_SETSIZE",
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31 newfd);
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32 exit(1);
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33 }
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34 if (newfd > max_fd)
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35 max_fd = newfd;
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36 }
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37
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38 main(argc, argv)
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39 char **argv;
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40 {
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41 fd_set fds;
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42 struct timeval timeout;
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43 int cc, i;
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44
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45 openlog("themwi-mgw", 0, LOG_LOCAL5);
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46 read_config_file();
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47 dtmf_init_sample_arrays();
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48 if (create_ctrl_socket() < 0) {
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49 fprintf(stderr, "error creating TMGW control socket\n");
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50 exit(1);
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51 }
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52 signal(SIGPIPE, SIG_IGN);
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53 /* main select loop */
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54 for (;;) {
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55 bcopy(&select_for_read, &fds, sizeof(fd_set));
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56 if (dtmf_timer_running) {
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57 if (timercmp(&dtmf_next_time, &cur_event_time, >))
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58 timersub(&dtmf_next_time, &cur_event_time,
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59 &timeout);
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60 else
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61 timerclear(&timeout);
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62 cc = select(max_fd+1, &fds, 0, 0, &timeout);
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63 } else
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64 cc = select(max_fd+1, &fds, 0, 0, 0);
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65 if (cc < 0) {
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66 if (errno == EINTR)
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67 continue;
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68 syslog(LOG_CRIT, "select: %m");
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69 exit(1);
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70 }
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71 gettimeofday(&cur_event_time, 0);
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72 for (i = 0; cc && i <= max_fd; i++) {
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73 if (FD_ISSET(i, &fds)) {
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74 select_handlers[i](i, select_data[i]);
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75 cc--;
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76 }
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77 }
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78 if (dtmf_timer_running &&
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79 !timercmp(&cur_event_time, &dtmf_next_time, <))
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80 dtmf_timer_process();
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81 free_deleted_endpoints();
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82 }
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83 }