add socket for linux

Author: DataEraserC

c/socket/linux/client.c

@@ -0,0 +1,36 @@
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <stdio.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>
+#include <unistd.h>
+#define PORT 3339
+int main()
+{
+    int sockfd;
+    int len;
+    struct sockaddr_in addr;
+    int newsockfd;
+    char *buf = "come on";
+    int len2;
+    char rebuf[40];
+    sockfd = socket(AF_INET, SOCK_STREAM, 0);
+    addr.sin_family = AF_INET;
+    addr.sin_addr.s_addr = htonl(INADDR_ANY);
+    addr.sin_port = PORT;
+    len = sizeof(addr);
+    newsockfd =connect(sockfd, (struct sockaddr *)&addr, len);
+    if (newsockfd = -1)
+    {
+        perror("connect failed");
+        return 1;
+    }
+    len2 = sizeof(rebuf);
+    send(sockfd, buf, sizeof(buf), 0);
+    sleep(10);
+    recv(sockfd,rebuf,len2,0);
+    rebuf[sizeof(rebuf)+1] = '\0';
+    printf("receive message: %s\n", rebuf);
+    close(sockfd);
+    return 0;
+}

c/socket/linux/server.c

@@ -0,0 +1,34 @@
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <stdio.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>
+#include <unistd.h>
+#define PORT 3339
+int main()
+{
+    char *sendbuf = "thanks";
+    char buf[256];
+    int s_fd, c_fd;
+    int s_len, c_len;
+    struct sockaddr_in s_addr;
+    struct sockaddr_in c_addr;
+    s_fd = socket(AF_INET, SOCK_STREAM, 0);
+    s_addr.sin_family = AF_INET;
+    s_addr.sin_addr.s_addr = htonl(INADDR_ANY);
+    s_addr.sin_port = PORT;
+    s_len = sizeof(s_addr);
+    bind(s_fd, (struct sockaddr *)&s_addr, s_len);
+    listen(s_fd, 10);
+    while (1)
+    {
+        printf("please wait a moment\n");
+        c_len = sizeof(c_addr);
+        c_fd = accept(s_fd, (struct sockaddr *)&c_addr, &c_len);
+        recv(c_fd, buf, sizeof(buf), 0);
+        printf("receive message: %s\n", buf);
+        send(c_fd, sendbuf, sizeof(sendbuf), 0);
+        close(c_fd);
+    }
+    return 0;
+}