working commit

tcpclient.cpp

@@ -0,0 +1,84 @@
+extern "C" {
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>
+}
+
+#include <expected>
+#include <string>
+#include <vector>
+#include <span>
+#include <iostream>
+
+#include <tcpclient.hpp>
+
+TCPClient::TCPClient() {
+        sock = 0;
+}
+
+std::expected<void, std::string> TCPClient::conn(const std::string address, const int port) {
+        sock = socket(AF_INET, SOCK_STREAM, 0);
+        if (sock < 0) {
+                return std::unexpected("Error opening socket");
+        }
+        struct sockaddr_in serv_addr;
+        memset(&serv_addr, 0, sizeof(serv_addr));
+
+        serv_addr.sin_family = AF_INET;
+        serv_addr.sin_port = htons(port);
+        const char* addr = address.data();
+        if (inet_pton(AF_INET, addr, &serv_addr.sin_addr) <= 0) {
+                return std::unexpected("Invalid server IP address");
+        }
+
+        struct timeval timeout;
+        timeout.tv_sec = 3;
+        timeout.tv_usec = 0;
+
+        if (setsockopt(sock, SOL_SOCKET, SO_RCVTIMEO, &timeout, sizeof timeout) < 0) {
+                return std::unexpected("Set timeout error");
+        }
+        if (setsockopt(sock, SOL_SOCKET, SO_SNDTIMEO, &timeout, sizeof timeout) < 0) {
+                return std::unexpected("Set timeout error");
+        }
+        if (connect(sock, (struct sockaddr*)&serv_addr, sizeof(serv_addr)) < 0) {
+                return std::unexpected("Connecting error");
+        }
+        return {};
+}
+
+
+std::expected<int, std::string> TCPClient::writeBytes(std::span<const std::byte> payload) {
+        int n = 0;
+        if ((n = write(sock, payload.data(), payload.size())) < 0) {
+                return std::unexpected("Write error");
+        }
+        return n;
+}
+
+std::expected<int, std::string> TCPClient::writeBytes(std::string payload) {
+        int n = 0;
+        if ((n = write(sock, payload.data(), payload.size())) < 0) {
+                return std::unexpected("Write error");
+        }
+        return n;
+}
+
+std::expected<int, std::string> TCPClient::readBytes(std::vector<std::byte>* buffer) {
+        int n = 0;
+        if ((n = read(sock, buffer->data(), buffer->size())) < 0) {
+                return std::unexpected("Read error");
+        }
+        return n;
+}
+
+std::expected<int, std::string> TCPClient::readBytes(std::vector<uint8_t>* buffer) {
+        return read(sock, buffer->data(), buffer->size());
+}
+
+

tcpclient.hpp

@@ -0,0 +1,22 @@
+
+#include <expected>
+#include <string>
+#include <vector>
+#include <span>
+#include <iostream>
+
+class TCPClient {
+private:
+        int sock;
+public:
+        TCPClient();
+        std::expected<void, std::string> conn(std::string address, const int port);
+        std::expected<int, std::string> writeBytes(std::span<const std::byte> payload);
+        std::expected<int, std::string> writeBytes(std::string payload);
+        std::expected<int, std::string> readBytes(std::vector<std::byte>* buffer);
+        std::expected<int, std::string> readBytes(std::vector<uint8_t>* buffer);
+
+        ~TCPClient() {
+                close(sock);
+        }
+};

tcpclient_test.cpp

@@ -0,0 +1,34 @@
+
+#include <expected>
+#include <string>
+#include <vector>
+#include <span>
+#include <iostream>
+
+#include <tcpclient.hpp>
+
+int main( int argc, char** argv) {
+        TCPClient client;
+        auto res = client.conn("209.51.188.116", 80);
+        if (!res) {
+                std::cerr << res.error() << std::endl;
+                return 1;
+        }
+        auto wSize = client.writeBytes("GET /   HTTP/1.1\n\n\n");
+        if (!wSize) {
+                std::cerr << wSize.error() << std::endl;
+                return 1;
+        }
+
+        std::vector<uint8_t> buffer;
+        buffer.resize(2048);
+        auto rSize = client.readBytes(&buffer);
+        if (!rSize) {
+                std::cerr << rSize.error() << std::endl;
+                return 1;
+        }
+        std::cout << rSize.value() << std::endl;
+
+        std::string s(buffer.begin(), buffer.end());
+        std::cout << std::format("{}", s) << std::endl;
+}

tunclient.hpp

@@ -1,5 +1,4 @@
 
-
 #include <expected>
 #include <string>
 #include <cstring>

works/thrsema/thr.cpp

@@ -0,0 +1,41 @@
+
+#include <iostream>
+#include <semaphore>
+#include <thread>
+#include <chrono>
+
+using namespace std::chrono_literals;
+
+
+void worker(int id, std::binary_semaphore* wait, std::binary_semaphore* sign) {
+    for (int i = 0; i < 5; i++) {
+	std::cout << std::format("worker {}: working {}\n", id, i);
+        std::chrono::milliseconds timesleep(1s);
+        std::this_thread::sleep_for(timesleep);
+	if (sign->try_acquire()) {
+    	    std::cout << std::format("worker {}: break\n", id);
+	    break;
+	}
+    }
+    wait->release();
+}
+
+int main() {
+    std::binary_semaphore wait(0);
+    std::binary_semaphore sign(0);
+
+    std::thread t1(worker, 1, &wait, &sign);
+    t1.detach();
+
+    std::chrono::milliseconds timesleep(1s);
+    std::this_thread::sleep_for(timesleep);
+    sign.release();
+    std::cout << "main: wait worker\n";
+    wait.acquire();
+    std::cout << "main: worker finished\n";
+
+    std::this_thread::sleep_for(timesleep);
+
+    std::cout << "main: exit\n";
+}
+