补充课后作业

ch18/homework/echo_client.c

@@ -0,0 +1,58 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <arpa/inet.h>
+#include <sys/socket.h>
+
+#define BUF_SIZE 1024
+void error_handling(char* message);
+
+int main(int argc, char* argv[])
+{
+    int sock;
+    char message[BUF_SIZE];
+    int str_len;
+    struct sockaddr_in serv_adr;
+
+    if(argc != 3) {
+        printf("Usage : %s <IP> <port>\n", argv[0]);
+        exit(1);
+    }
+    /*创建tcp套接字*/
+    sock = socket(PF_INET, SOCK_STREAM, 0);
+    if(sock == -1)
+        error_handling("socket() error");
+    /*初始化*/
+    memset(&serv_adr, 0, sizeof(serv_adr));
+    serv_adr.sin_family = AF_INET;
+    serv_adr.sin_addr.s_addr = inet_addr(argv[1]);//string转大端序整型
+    serv_adr.sin_port = htons(atoi(argv[2]));
+    /*建立连接*/
+    if(connect(sock, (struct sockaddr*)&serv_adr, sizeof(serv_adr)) == -1)
+        error_handling("connect() error");
+    else
+        puts("Connected...........");
+
+    while(1)
+    {
+        fputs("Input message(Q to quit): ", stdout);
+        fgets(message, BUF_SIZE, stdin);
+        //实现按q或者Q退出
+        if(!strcmp(message, "q\n") || !strcmp(message, "Q\n"))
+            break;
+        
+        write(sock, message, strlen(message));
+        str_len = read(sock, message, BUF_SIZE - 1);
+        message[str_len] = 0;
+        printf("Message from server: %s", message);
+    }
+    close(sock);
+    return 0;
+}
+
+void error_handling(char* message)
+{
+    fputs(message, stderr);
+    fputc('\n',stderr);
+    exit(1);
+}

ch18/homework/echo_threadserv.c

@@ -0,0 +1,78 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <arpa/inet.h>
+#include <sys/socket.h>
+#include <sys/select.h>
+#include <pthread.h>
+
+#define BUF_SIZE 100
+void * handle_clnt(void * arg);
+void error_handling(char *buf);
+
+char buf[BUF_SIZE];
+pthread_mutex_t mutx;
+
+int main(int argc, char *argv[])
+{
+	int serv_sock, clnt_sock;
+	struct sockaddr_in serv_adr, clnt_adr;
+	int clnt_adr_sz;
+	pthread_t t_id;
+
+	if(argc != 2) {
+		printf("Usage : %s <port>\n", argv[0]);
+		exit(1);
+	}
+
+	pthread_mutex_init(&mutx, NULL);
+	serv_sock = socket(PF_INET, SOCK_STREAM, 0);
+	memset(&serv_adr, 0, sizeof(serv_adr));
+	serv_adr.sin_family = AF_INET;
+	serv_adr.sin_addr.s_addr = htonl(INADDR_ANY);
+	serv_adr.sin_port = htons(atoi(argv[1]));
+	
+	if(bind(serv_sock, (struct sockaddr*) &serv_adr, sizeof(serv_adr)) == -1)
+		error_handling("bind() error");
+	if(listen(serv_sock, 5) == -1)
+		error_handling("listen() error");
+
+	while(1)
+	{
+		clnt_adr_sz = sizeof(clnt_adr);
+		clnt_sock = accept(serv_sock, (struct sockaddr*)&clnt_adr,&clnt_adr_sz);
+		pthread_create(&t_id, NULL, handle_clnt, (void*)&clnt_sock);
+		pthread_detach(t_id);
+		printf("Connected client IP: %s \n", inet_ntoa(clnt_adr.sin_addr));
+	}
+
+	close(serv_sock);
+	return 0;
+}
+
+void * handle_clnt(void * arg)
+{
+	int clnt_sock = *((int*)arg);
+	int str_len = 0;
+	
+	while(1)
+	{
+		pthread_mutex_lock(&mutx);
+		str_len = read(clnt_sock, buf, sizeof(buf));
+		if(str_len <= 0)
+			break;
+		else
+			write(clnt_sock, buf, str_len);
+		pthread_mutex_unlock(&mutx);
+	}
+	
+	close(clnt_sock);
+	return NULL;
+}
+void error_handling(char *buf)
+{
+	fputs(buf, stderr);
+	fputc('\n', stderr);
+	exit(1);
+}