Checking in trout files

exercises/ex04/trout/main.c

@@ -0,0 +1,45 @@
+#include "trout.h"
+
+int main (int argc, char **argv)
+{
+  int c;
+  struct addrinfo *ai;
+  char *host;
+
+  opterr = 0;
+  while ( (c = getopt (argc, argv, "m:")) != -1) {
+    switch (c) {
+    case 'm':
+      if ( (max_ttl = atoi(optarg)) <= 1) {
+	      err_quit ("invalid -m value");
+      }
+      break;
+    default:
+      err_quit ("unrecognizd option: %c", c);
+    }
+  }
+
+  if (optind != argc - 1) {
+    err_quit ("usage: trout [ -m <maxttl>] <hostname>");
+  }
+  host = argv[optind];
+  ai = Host_serv (host, NULL, 0, 0);
+
+  printf ("trout to %s (%s): %d hops max, %d data bytes\n",
+	  ai->ai_canonname,
+	  Sock_ntop_host (ai->ai_addr, ai->ai_addrlen),
+	  max_ttl, datalen);
+
+  if (ai->ai_family != AF_INET) {
+    err_quit ("unknown address family %d", ai->ai_family);
+  }
+
+  sasend = ai->ai_addr;
+  salen = ai->ai_addrlen;
+  sarecv = Calloc (1, salen);
+  salast = Calloc (1, salen);
+  sabind = Calloc (1, salen);
+
+  loop_ttl ();
+  exit (0);
+}