--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/sip-in/main.c	Tue Sep 06 20:33:56 2022 -0800
@@ -0,0 +1,72 @@
+/*
+ * Main module for themwi-sip-in.
+ */
+
+#include <sys/types.h>
+#include <sys/time.h>
+#include <sys/errno.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <strings.h>
+#include <signal.h>
+#include <syslog.h>
+#include <unistd.h>
+
+extern int mgw_socket, sip_socket;
+
+static int max_fd;
+
+struct timeval cur_event_time;
+
+update_max_fd(newfd)
+{
+	if (newfd > max_fd)
+		max_fd = newfd;
+}
+
+main(argc, argv)
+	char **argv;
+{
+	fd_set fds;
+	int rc;
+
+	openlog("themwi-sip-in", 0, LOG_LOCAL5);
+	read_config_file();
+	if (read_number_db() < 0) {
+		fprintf(stderr, "error reading number database\n");
+		exit(1);
+	}
+	if (open_tmgw_socket() < 0) {
+		fprintf(stderr, "error connecting to themwi-mgw socket\n");
+		exit(1);
+	}
+	if (open_sip_udp_socket() < 0) {
+		fprintf(stderr, "error opening SIP UDP socket\n");
+		exit(1);
+	}
+	if (argv[1]) {
+		rc = open_sip_log_file(argv[1]);
+		if (rc < 0)
+			exit(1);	/* error msg already printed */
+	}
+	signal(SIGPIPE, SIG_IGN);
+	/* main select loop */
+	for (;;) {
+		FD_ZERO(&fds);
+		FD_SET(mgw_socket, &fds);
+		FD_SET(sip_socket, &fds);
+		rc = select(max_fd+1, &fds, 0, 0, 0);
+		if (rc < 0) {
+			if (errno == EINTR)
+				continue;
+			syslog(LOG_CRIT, "select: %m");
+			exit(1);
+		}
+		gettimeofday(&cur_event_time, 0);
+		if (FD_ISSET(mgw_socket, &fds))
+			mgw_socket_select();
+		if (FD_ISSET(sip_socket, &fds))
+			sip_socket_select();
+	}
+}