Unix sockets demo

socket/socket.c

@@ -0,0 +1,73 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <sys/socket.h>
+#include <sys/un.h>
+
+#define SOCKET_PATH "/tmp/demosocket"
+#define BUF_SIZE 128
+
+int main(void) {
+    int server_fd, client_fd;
+    struct sockaddr_un addr;
+    char buf[BUF_SIZE];
+
+    // Clean up any leftover socket file
+    unlink(SOCKET_PATH);
+
+    // Create socket
+    server_fd = socket(AF_UNIX, SOCK_STREAM, 0);
+    if (server_fd == -1) {
+        perror("socket");
+        exit(EXIT_FAILURE);
+    }
+
+    // Zero out and set up the address structure
+    memset(&addr, 0, sizeof(addr));
+    addr.sun_family = AF_UNIX;
+    strncpy(addr.sun_path, SOCKET_PATH, sizeof(addr.sun_path) - 1);
+
+    // Bind the socket to the path
+    if (bind(server_fd, (struct sockaddr *)&addr, sizeof(addr)) == -1) {
+        perror("bind");
+        close(server_fd);
+        exit(EXIT_FAILURE);
+    }
+
+    // Listen for a connection
+    if (listen(server_fd, 1) == -1) {
+        perror("listen");
+        close(server_fd);
+        exit(EXIT_FAILURE);
+    }
+
+    printf("Server listening on %s...\n", SOCKET_PATH);
+
+    // Accept a connection
+    client_fd = accept(server_fd, NULL, NULL);
+    if (client_fd == -1) {
+        perror("accept");
+        close(server_fd);
+        exit(EXIT_FAILURE);
+    }
+
+    // Receive a message
+    ssize_t received = recv(client_fd, buf, BUF_SIZE - 1, 0);
+    if (received > 0) {
+        buf[received] = '\0';
+        printf("Received: %s", buf);
+
+        // Send a reply
+        const char *reply = "Got your message!\n";
+        send(client_fd, reply, strlen(reply), 0);
+    } else {
+        perror("recv");
+    }
+
+    // Clean up
+    close(client_fd);
+    close(server_fd);
+    unlink(SOCKET_PATH);
+    return 0;
+}