完成了第 10 章 多进程服务器端

ch10/echo_mpclient.c

@@ -0,0 +1,74 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <arpa/inet.h>
+#include <sys/socket.h>
+
+#define BUF_SIZE 30
+void error_handling(char *message);
+void read_routine(int sock, char *buf);
+void write_routine(int sock, char *buf);
+
+int main(int argc, char *argv[])
+{
+    int sock;
+    pid_t pid;
+    char buf[BUF_SIZE];
+    struct sockaddr_in serv_adr;
+    if (argc != 3)
+    {
+        printf("Usage : %s <IP> <port>\n", argv[0]);
+        exit(1);
+    }
+    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 = inet_addr(argv[1]);
+    serv_adr.sin_port = htons(atoi(argv[2]));
+
+    if (connect(sock, (struct sockaddr *)&serv_adr, sizeof(serv_adr)) == -1)
+        error_handling("connect() error!");
+
+    pid = fork();
+    if (pid == 0)
+        write_routine(sock, buf);
+    else
+        read_routine(sock, buf);
+
+    close(sock);
+    return 0;
+}
+
+void read_routine(int sock, char *buf)
+{
+    while (1)
+    {
+        int str_len = read(sock, buf, BUF_SIZE);
+        if (str_len == 0)
+            return;
+
+        buf[str_len] = 0;
+        printf("Message from server: %s", buf);
+    }
+}
+void write_routine(int sock, char *buf)
+{
+    while (1)
+    {
+        fgets(buf, BUF_SIZE, stdin);
+        if (!strcmp(buf, "q\n") || !strcmp(buf, "Q\n"))
+        {
+            shutdown(sock, SHUT_WR); //向服务器端传递 EOF,因为fork函数复制了文件描述度，所以通过1次close调用不够
+            return;
+        }
+        write(sock, buf, strlen(buf));
+    }
+}
+
+void error_handling(char *message)
+{
+    fputs(message, stderr);
+    fputc('\n', stderr);
+    exit(1);
+}