Examples of simple sync tcp server and client.

Author: Anton Yarkov

networking/00 Basic blocked network interaction/client.c

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+#include <stdio.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <unistd.h>
+
+int main(int argc, char **argv)
+{
+    int Socket = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
+
+    struct sockaddr_in SockAddr;
+    SockAddr.sin_family = AF_INET;
+    SockAddr.sin_port = htons(12345);
+    SockAddr.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
+
+    connect(Socket, (struct sockaddr *)(&SockAddr), sizeof(SockAddr));
+
+    char Buffer[] = "PING";
+    send(Socket, Buffer, 4, MSG_NOSIGNAL);
+    recv(Socket, Buffer, 4, MSG_NOSIGNAL);
+
+    shutdown(Socket, SHUT_RDWR);
+    close(Socket);
+
+    printf("%c\n", Buffer);
+
+    return 0;
+}

networking/00 Basic blocked network interaction/server.c

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+#include <stdio.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <unistd.h>
+
+int main(int argc, char **argv)
+{
+    int MasterSocket = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
+
+    struct sockaddr_in SockAddr;
+    SockAddr.sin_family = AF_INET;
+    SockAddr.sin_port = htons(12345);
+    SockAddr.sin_addr.s_addr = htonl(INADDR_ANY); // 0.0.0.0
+
+    bind(MasterSocket, (struct sockaddr *)(&SockAddr), sizeof(SockAddr));
+
+    listen(MasterSocket, SOMAXCONN);
+
+    while (1)
+    {
+        int SlaveSocket = accept(MasterSocket, 0, 0);
+        int Buffer[5] = { 0, 0, 0, 0, 0 };
+        recv(SlaveSocket, Buffer, 4, MSG_NOSIGNAL);
+        shutdown(SlaveSocket, SHUT_RDWR);
+        close(SlaveSocket);
+        printf("%s\n", Buffer);
+    }
+
+    return 0;
+}