[SimpleDiskAndNetworkTest] use *AndWait() or waitAndSetErrno() and correct types

errno was never set on error and thus the DIE_MSG_ERRNO did not properly
report what happened.

Found during changing Future member types.

tests/io/SimpleDiskAndNetworkTest.cpp

@@ -26,9 +26,8 @@
 static void server_func(int sockfd) {
 	struct sockaddr_in clientaddr;
 	socklen_t clientaddr_len = sizeof(clientaddr);
-	auto client_fd =
-			emper::io::accept(sockfd, reinterpret_cast<struct sockaddr*>(&clientaddr), &clientaddr_len)
-					->wait();
+	auto client_fd = emper::io::acceptAndWait(sockfd, reinterpret_cast<struct sockaddr*>(&clientaddr),
+																						&clientaddr_len);
 
 	if (client_fd < 0) {
 		DIE_MSG_ERRNO("accept failed");
@@ -40,7 +39,7 @@ static void server_func(int sockfd) {
 	char read_buf[MAX];
 
 	for (;;) {
-		int received = emper::io::recv(client_fd, recv_buf, sizeof(recv_buf), 0)->wait();
+		ssize_t received = emper::io::recvAndWait(client_fd, recv_buf, sizeof(recv_buf), 0);
 		if (received == 0) {
 			exit(EXIT_SUCCESS);
 		}
@@ -57,7 +56,7 @@ static void server_func(int sockfd) {
 			DIE_MSG_ERRNO("mkstemp failed");
 		}
 
-		int written = emper::io::writeFile(file_fd, recv_buf, received)->wait();
+		ssize_t written = emper::io::writeFileAndWait(file_fd, recv_buf, received);
 		if (written < 0) {
 			DIE_MSG_ERRNO("write failed");
 		}
@@ -68,7 +67,7 @@ static void server_func(int sockfd) {
 			DIE_MSG_ERRNO("open failed");
 		}
 
-		int bytes_read = emper::io::readFile(file_fd, read_buf, written)->wait();
+		ssize_t bytes_read = emper::io::readFileAndWait(file_fd, read_buf, written);
 		if (bytes_read == 0) {
 			DIE_MSG("nothing to read");
 		}
@@ -78,7 +77,7 @@ static void server_func(int sockfd) {
 		}
 		close(file_fd);
 
-		int sent = emper::io::send(client_fd, read_buf, bytes_read, 0)->wait();
+		ssize_t sent = emper::io::sendAndWait(client_fd, read_buf, bytes_read, 0);
 		if (sent == 0) {
 			DIE_MSG("client socket unexpected shutdown");
 		}
@@ -107,7 +106,7 @@ static void server_func(int sockfd) {
 		iov[1].iov_len = s2.length();
 
 		auto writevFuture = emper::io::writev(file_fd, &iov[0], iovcnt);
-		written = writevFuture->wait();
+		written = writevFuture->waitAndSetErrno();
 		if (written < 0) {
 			DIE_MSG_ERRNO("wrtev failed");
 		}
@@ -119,7 +118,7 @@ static void server_func(int sockfd) {
 		}
 
 		auto readFuture = emper::io::readFile(file_fd, read_buf, written, 0, true);
-		bytes_read = readFuture->wait();
+		bytes_read = readFuture->waitAndSetErrno();
 		if (bytes_read == 0) {
 			DIE_MSG("nothing to read");
 		}