4 files changed, 40 insertions, 0 deletions
diff --git a/source4/lib/socket/socket.c b/source4/lib/socket/socket.c
index 13d1640f51..dd3175468d 100644
--- a/source4/lib/socket/socket.c
+++ b/source4/lib/socket/socket.c
@@ -235,6 +235,22 @@ NTSTATUS socket_sendto(struct socket_context *sock,
 	return sock->ops->fn_sendto(sock, blob, sendlen, flags, dest_addr, dest_port);
 }
 
+
+/*
+  ask for the number of bytes in a pending incoming datagram
+*/
+NTSTATUS socket_pending(struct socket_context *sock, size_t *npending)
+{
+	if (sock->type != SOCKET_TYPE_DGRAM) {
+		return NT_STATUS_INVALID_PARAMETER;
+	}
+	if (!sock->ops->fn_pending) {
+		return NT_STATUS_NOT_IMPLEMENTED;
+	}
+	return sock->ops->fn_pending(sock, npending);
+}
+
+
 NTSTATUS socket_set_option(struct socket_context *sock, const char *option, const char *val)
 {
 	if (!sock->ops->fn_set_option) {
diff --git a/source4/lib/socket/socket.h b/source4/lib/socket/socket.h
index bce64f9f6c..e2879e5247 100644
--- a/source4/lib/socket/socket.h
+++ b/source4/lib/socket/socket.h
@@ -60,6 +60,7 @@ struct socket_ops {
 	NTSTATUS (*fn_recvfrom)(struct socket_context *sock, 
 				void *buf, size_t wantlen, size_t *nread, uint32_t flags,
 				const char **src_addr, int *src_port);
+	NTSTATUS (*fn_pending)(struct socket_context *sock, size_t *npending);      
 
 	void (*fn_close)(struct socket_context *sock);
 
@@ -124,6 +125,7 @@ NTSTATUS socket_send(struct socket_context *sock,
 NTSTATUS socket_sendto(struct socket_context *sock, 
 		       const DATA_BLOB *blob, size_t *sendlen, uint32_t flags,
 		       const char *dest_addr, int dest_port);
+NTSTATUS socket_pending(struct socket_context *sock, size_t *npending);
 NTSTATUS socket_set_option(struct socket_context *sock, const char *option, const char *val);
 char *socket_get_peer_name(struct socket_context *sock, TALLOC_CTX *mem_ctx);
 char *socket_get_peer_addr(struct socket_context *sock, TALLOC_CTX *mem_ctx);
diff --git a/source4/lib/socket/socket_ipv4.c b/source4/lib/socket/socket_ipv4.c
index 93ddf68046..0fc65698c4 100644
--- a/source4/lib/socket/socket_ipv4.c
+++ b/source4/lib/socket/socket_ipv4.c
@@ -435,6 +435,16 @@ static int ipv4_get_fd(struct socket_context *sock)
 	return sock->fd;
 }
 
+static NTSTATUS ipv4_pending(struct socket_context *sock, size_t *npending)
+{
+	int value = 0;
+	if (ioctl(sock->fd, FIONREAD, &value) == 0) {
+		*npending = value;
+		return NT_STATUS_OK;
+	}
+	return map_nt_error_from_unix(errno);
+}
+
 static const struct socket_ops ipv4_ops = {
 	.name			= "ipv4",
 	.fn_init		= ipv4_init,
@@ -446,6 +456,7 @@ static const struct socket_ops ipv4_ops = {
 	.fn_recvfrom		= ipv4_recvfrom,
 	.fn_send		= ipv4_send,
 	.fn_sendto		= ipv4_sendto,
+	.fn_pending		= ipv4_pending,
 	.fn_close		= ipv4_close,
 
 	.fn_set_option		= ipv4_set_option,
diff --git a/source4/lib/socket/socket_unix.c b/source4/lib/socket/socket_unix.c
index 04ba89578f..f27076b5d8 100644
--- a/source4/lib/socket/socket_unix.c
+++ b/source4/lib/socket/socket_unix.c
@@ -316,6 +316,16 @@ static int unixdom_get_fd(struct socket_context *sock)
 	return sock->fd;
 }
 
+static NTSTATUS unixdom_pending(struct socket_context *sock, size_t *npending)
+{
+	int value = 0;
+	if (ioctl(sock->fd, FIONREAD, &value) == 0) {
+		*npending = value;
+		return NT_STATUS_OK;
+	}
+	return map_nt_error_from_unix(errno);
+}
+
 static const struct socket_ops unixdom_ops = {
 	.name			= "unix",
 	.fn_init		= unixdom_init,
@@ -327,6 +337,7 @@ static const struct socket_ops unixdom_ops = {
 	.fn_send		= unixdom_send,
 	.fn_sendto		= unixdom_sendto,
 	.fn_close		= unixdom_close,
+	.fn_pending		= unixdom_pending,
 
 	.fn_set_option		= unixdom_set_option,