完成了第 15 章 套接字和标准I/O

ch15/echo_stdserv.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 1024
+void error_handling(char *message);
+
+int main(int argc, char *argv[])
+{
+    int serv_sock, clnt_sock;
+    char message[BUF_SIZE];
+    int str_len, i;
+
+    struct sockaddr_in serv_adr, clnt_adr;
+    socklen_t clnt_adr_sz;
+    FILE *readfp;
+    FILE *writefp;
+
+    if (argc != 2)
+    {
+        printf("Usage : %s <port>\n", argv[0]);
+        exit(1);
+    }
+
+    serv_sock = socket(PF_INET, SOCK_STREAM, 0);
+    if (serv_sock == -1)
+        error_handling("socket() error");
+
+    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");
+
+    clnt_adr_sz = sizeof(clnt_adr);
+    //调用 5 次 accept 函数，共为 5 个客户端提供服务
+    for (i = 0; i < 5; i++)
+    {
+        clnt_sock = accept(serv_sock, (struct sockaddr *)&clnt_adr, &clnt_adr_sz);
+        if (clnt_sock == -1)
+            error_handling("accept() error");
+        else
+            printf("Connect client %d \n", i + 1);
+
+        readfp = fdopen(clnt_sock, "r");
+        writefp = fdopen(clnt_sock, "w");
+        while (!feof(readfp))
+        {
+            fgets(message, BUF_SIZE, readfp);
+            fputs(message, writefp);
+            fflush(writefp);
+        }
+
+        fclose(readfp);
+        fclose(writefp);
+    }
+    close(serv_sock);
+    return 0;
+}
+
+void error_handling(char *message)
+{
+    fputs(message, stderr);
+    fputc('\n', stderr);
+    exit(1);
+}