MEDIUM: connection: remove conn_{data,sock}_poll_{recv,send}

We simply remove these functions and replace their calls with the
appropriate ones :

  - if we're in the data phase, we can simply report wait on the FD
  - if we're in the socket phase, we may also have to signal the
    desire to read/write on the socket because it might not be
    active yet.
diff --git a/src/connection.c b/src/connection.c
index 0056ec0..2538cc5 100644
--- a/src/connection.c
+++ b/src/connection.c
@@ -261,7 +261,7 @@
 			if (errno == EINTR)
 				continue;
 			if (errno == EAGAIN) {
-				__conn_sock_poll_recv(conn);
+				fd_cant_recv(conn->t.sock.fd);
 				return 0;
 			}
 			goto recv_abort;
diff --git a/src/proto_tcp.c b/src/proto_tcp.c
index 4460bb4..cb10661 100644
--- a/src/proto_tcp.c
+++ b/src/proto_tcp.c
@@ -657,7 +657,7 @@
 	if (connect(fd, (struct sockaddr *)&conn->addr.to, get_addr_len(&conn->addr.to)) < 0) {
 		if (errno == EALREADY || errno == EINPROGRESS) {
 			__conn_sock_stop_recv(conn);
-			__conn_sock_poll_send(conn);
+			fd_cant_send(fd);
 			return 0;
 		}
 
diff --git a/src/raw_sock.c b/src/raw_sock.c
index 2e3a0cb..3d42781 100644
--- a/src/raw_sock.c
+++ b/src/raw_sock.c
@@ -145,7 +145,7 @@
 #ifndef ASSUME_SPLICE_WORKS
 				if (splice_detects_close)
 #endif
-					__conn_data_poll_recv(conn); /* we know for sure that it's EAGAIN */
+					fd_cant_recv(conn->t.sock.fd); /* we know for sure that it's EAGAIN */
 				break;
 			}
 			else if (errno == ENOSYS || errno == EINVAL || errno == EBADF) {
@@ -203,7 +203,7 @@
 
 		if (ret <= 0) {
 			if (ret == 0 || errno == EAGAIN) {
-				__conn_data_poll_send(conn);
+				fd_cant_send(conn->t.sock.fd);
 				break;
 			}
 			else if (errno == EINTR)
@@ -298,7 +298,7 @@
 			goto read0;
 		}
 		else if (errno == EAGAIN) {
-			__conn_data_poll_recv(conn);
+			fd_cant_recv(conn->t.sock.fd);
 			break;
 		}
 		else if (errno != EINTR) {
@@ -376,7 +376,7 @@
 		}
 		else if (ret == 0 || errno == EAGAIN || errno == ENOTCONN) {
 			/* nothing written, we need to poll for write first */
-			__conn_data_poll_send(conn);
+			fd_cant_send(conn->t.sock.fd);
 			break;
 		}
 		else if (errno != EINTR) {
diff --git a/src/ssl_sock.c b/src/ssl_sock.c
index 0cfcca7..d30a8eb 100644
--- a/src/ssl_sock.c
+++ b/src/ssl_sock.c
@@ -1191,7 +1191,8 @@
 			if (ret == SSL_ERROR_WANT_WRITE) {
 				/* SSL handshake needs to write, L4 connection may not be ready */
 				__conn_sock_stop_recv(conn);
-				__conn_sock_poll_send(conn);
+				__conn_sock_want_send(conn);
+				fd_cant_send(conn->t.sock.fd);
 				return 0;
 			}
 			else if (ret == SSL_ERROR_WANT_READ) {
@@ -1206,7 +1207,8 @@
 				if (conn->flags & CO_FL_WAIT_L4_CONN)
 					conn->flags &= ~CO_FL_WAIT_L4_CONN;
 				__conn_sock_stop_send(conn);
-				__conn_sock_poll_recv(conn);
+				__conn_sock_want_recv(conn);
+				fd_cant_recv(conn->t.sock.fd);
 				return 0;
 			}
 			else if (ret == SSL_ERROR_SYSCALL) {
@@ -1249,7 +1251,8 @@
 		if (ret == SSL_ERROR_WANT_WRITE) {
 			/* SSL handshake needs to write, L4 connection may not be ready */
 			__conn_sock_stop_recv(conn);
-			__conn_sock_poll_send(conn);
+			__conn_sock_want_send(conn);
+			fd_cant_send(conn->t.sock.fd);
 			return 0;
 		}
 		else if (ret == SSL_ERROR_WANT_READ) {
@@ -1257,7 +1260,8 @@
 			if (conn->flags & CO_FL_WAIT_L4_CONN)
 				conn->flags &= ~CO_FL_WAIT_L4_CONN;
 			__conn_sock_stop_send(conn);
-			__conn_sock_poll_recv(conn);
+			__conn_sock_want_recv(conn);
+			fd_cant_recv(conn->t.sock.fd);
 			return 0;
 		}
 		else if (ret == SSL_ERROR_SYSCALL) {
@@ -1404,7 +1408,7 @@
 					break;
 				}
 				/* we need to poll for retry a read later */
-				__conn_data_poll_recv(conn);
+				fd_cant_recv(conn->t.sock.fd);
 				break;
 			}
 			/* otherwise it's a real error */
@@ -1485,7 +1489,7 @@
 					break;
 				}
 				/* we need to poll to retry a write later */
-				__conn_data_poll_send(conn);
+				fd_cant_send(conn->t.sock.fd);
 				break;
 			}
 			else if (ret == SSL_ERROR_WANT_READ) {
diff --git a/src/stream_interface.c b/src/stream_interface.c
index 063c173..6096dd7 100644
--- a/src/stream_interface.c
+++ b/src/stream_interface.c
@@ -487,7 +487,7 @@
 
  out_wait:
 	__conn_sock_stop_recv(conn);
-	__conn_sock_poll_send(conn);
+	fd_cant_send(conn->t.sock.fd);
 	return 0;
 }