Socket library

lib/ip/setsockopt.c

@@ -0,0 +1,70 @@
+#include <assert.h>
+#include <errno.h>
+#include <stdio.h>
+#include <sys/ioctl.h>
+#include <sys/socket.h>
+#include <sys/types.h>
+
+#include <net/gen/in.h>
+#include <net/gen/tcp.h>
+#include <net/gen/tcp_io.h>
+
+#define DEBUG 0
+
+static int _tcp_setsockopt(int socket, int level, int option_name,
+	const void *option_value, socklen_t option_len);
+
+int setsockopt(int socket, int level, int option_name,
+        const void *option_value, socklen_t option_len)
+{
+	int r;
+	nwio_tcpopt_t tcpopt;
+
+	r= ioctl(socket, NWIOGTCPOPT, &tcpopt);
+	if (r != -1 || errno != ENOTTY)
+	{
+		if (r == -1)
+		{
+			/* Bad file descriptor */
+			return -1;
+		}
+		return _tcp_setsockopt(socket, level, option_name,
+			option_value, option_len);
+	}
+
+#if DEBUG
+	fprintf(stderr, "setsockopt: not implemented for fd %d\n", socket);
+#endif
+	errno= ENOSYS;
+	return -1;
+}
+
+static int _tcp_setsockopt(int socket, int level, int option_name,
+	const void *option_value, socklen_t option_len)
+{
+	int i;
+
+	if (level == SOL_SOCKET && option_name == SO_KEEPALIVE)
+	{
+		if (option_len != sizeof(i))
+		{
+			errno= EINVAL;
+			return -1;
+		}
+		i= *(int *)option_value;
+		if (!i)
+		{
+			/* At the moment there is no way to turn off 
+			 * keepalives.
+			 */
+			errno= ENOSYS;
+			return -1;
+		}
+		return 0;
+	}
+	fprintf(stderr, "_tcp_setsocketopt: level %d, name %d\n",
+		level, option_name);
+
+	assert(0);
+}
+