sock options

sock-options/getsockopt.c

@@ -0,0 +1,41 @@
+#include <stdlib.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <stdio.h>
+
+main()
+{
+   int optlen, gs, socktype, s;
+
+      /* Create a datagram socket. */
+   s = socket(AF_INET, SOCK_DGRAM, 0);
+   if (s == -1) {
+      perror("Socket not created");
+      return EXIT_FAILURE;
+   }
+
+      /* Ask for the socket type. */
+   optlen = sizeof(socktype);
+   gs = getsockopt (s, SOL_SOCKET, SO_TYPE, &socktype, &optlen);
+   if (gs == -1) {
+      perror("getsockopt failed");
+      return EXIT_FAILURE;
+   }
+      /* Print socket type. */
+   switch (socktype)
+   {
+   case SOCK_STREAM:
+      puts("Stream socket.\n");
+      break;
+   case SOCK_DGRAM:
+      puts("Datagram socket.\n");
+      break;
+   case SOCK_RAW:
+      puts("Raw socket.\n");
+      break;
+   default:
+      puts("Unknown socket type.\n");
+      break;
+   }
+   return EXIT_SUCCESS;
+}