added sock20

TMP/Practice/sock20.10.23/c3.c

@@ -0,0 +1,91 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <errno.h>
+#include <error.h>
+#include <string.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <sys/un.h>
+#include <unistd.h>
+#include <time.h>
+
+#define SERVER_PATH "/tmp/unix_sock.server"
+#define CLIENT_PATH "unix_sock.client"
+#define DATA "Hello from client"
+#define BUF 128
+
+int main(int argc,char *argv[]){
+
+    int client_sock, rc, len;
+    struct sockaddr_un server_sockaddr; 
+    struct sockaddr_un client_sockaddr; 
+    char buf[BUF];
+    size_t bs=BUF;
+    char cpath[22];
+
+    srand(time(NULL));
+    sprintf(cpath,"%03d-%s",rand()%1000,CLIENT_PATH); 
+    len = sizeof(client_sockaddr);
+    memset(&server_sockaddr, 0, sizeof(struct sockaddr_un));
+    memset(&client_sockaddr, 0, sizeof(struct sockaddr_un));
+     
+    client_sock = socket(AF_UNIX, SOCK_STREAM, 0);
+    if (client_sock == -1) {
+        perror("socket");
+        exit(1);
+    }
+
+
+    client_sockaddr.sun_family = AF_UNIX;   
+    strcpy(client_sockaddr.sun_path, cpath); 
+    
+    unlink(cpath);
+    rc = bind(client_sock, (struct sockaddr *) &client_sockaddr, len);
+    if (rc == -1){
+        perror("bind");
+        close(client_sock);
+        exit(1);
+    }
+        
+    server_sockaddr.sun_family = AF_UNIX;
+    strcpy(server_sockaddr.sun_path, SERVER_PATH);
+    rc = connect(client_sock, (struct sockaddr *) &server_sockaddr, len);
+    if(rc == -1){
+        perror("connect");
+        close(client_sock);
+        exit(1);
+    }
+    
+    if (argc > 1) 
+       strcpy(buf, argv[1]);
+    else    
+       strcpy(buf, DATA);                 
+
+    printf("Sending data...\n");
+    rc = send(client_sock, buf, strlen(buf), 0);
+    if (rc == -1) {
+        perror("send");
+        close(client_sock);
+        exit(1);
+    }   
+    else {
+        printf("Data sent!\n");
+    }
+
+    printf("Waiting to recieve data...\n");
+    memset(buf, 0, sizeof(buf));
+    rc = recv(client_sock, buf, bs,0);
+    if (rc == -1) {
+        perror("recv");
+        close(client_sock);
+        exit(1);
+    }   
+    else {
+        printf("DATA RECEIVED = %s\n", buf);
+    }
+    
+    close(client_sock);
+    unlink(cpath);
+    
+    return 0;
+}