From 122a69f715acfe73963a2347cbb335e41bce944c Mon Sep 17 00:00:00 2001
From: Guangxiong Lin <hi@gxlin.org>
Date: Thu, 1 Dec 2022 16:08:38 +0800
Subject: Implement echo server with error handling

Implement echo server with error handling

Fix gitignore

Implement an echo server with error handling
---
 client.c | 33 ++++++++++++++++++++++++++++++++-
 1 file changed, 32 insertions(+), 1 deletion(-)

(limited to 'client.c')

diff --git a/client.c b/client.c
index 82c35a6..9e3a421 100644
--- a/client.c
+++ b/client.c
@@ -1,11 +1,19 @@
 #include <sys/socket.h>
 #include <arpa/inet.h>
 #include <strings.h>
+#include <sys/types.h>
+#include <unistd.h>
+#include <stdbool.h>
+#include <stdio.h>
+
+#include "common.h"
 
 int
 main()
 {
     int sockfd = socket(AF_INET, SOCK_STREAM, 0);
+    if (sockfd == -1)
+        panic("socket creation error");
 
     struct sockaddr_in serv_addr;
     bzero(&serv_addr, sizeof(serv_addr));
@@ -13,5 +21,28 @@ main()
     serv_addr.sin_addr.s_addr = inet_addr("127.0.0.1");
     serv_addr.sin_port = htons(8888);
 
-    connect(sockfd, (struct sockaddr *)&serv_addr, sizeof(serv_addr));
+    if (connect(sockfd, (struct sockaddr *)&serv_addr, sizeof(serv_addr)) == -1)
+        panic("socket connect error");
+
+    while (true) {
+        char buf[1024];
+        bzero(&buf, sizeof(buf));
+        scanf("%s", buf);
+        ssize_t n_write_bytes = write(sockfd, buf, sizeof(buf));
+        if (n_write_bytes == -1) {
+            printf("socket already disconnected, cannot write any more!\n");
+            break;
+        }
+
+        ssize_t n_read_bytes = read(sockfd, buf, sizeof(buf));
+        if (n_read_bytes > 0) {
+            printf("message from server: %s\n", buf);
+        } else if (n_read_bytes == 0) {
+            printf("server socket disconnected!\n");
+            break;
+        } else if (n_read_bytes == -1) {
+            close(sockfd);
+            panic("socket read error");
+        }
+    }
 }
-- 
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