mirror of
https://github.com/riba2534/TCP-IP-NetworkNote.git
synced 2026-02-03 01:53:19 +08:00
54 lines
1.6 KiB
C
54 lines
1.6 KiB
C
#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <arpa/inet.h>
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#include <sys/socket.h>
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void error_handling(char *message);
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int main(int argc, char *argv[])
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{
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int sock;
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struct sockaddr_in serv_addr;
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char message[30];
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int str_len = 0;
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int idx = 0, read_len = 0;
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if (argc != 3)
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{
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printf("Usage : %s <IP> <port>\n", argv[0]);
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exit(1);
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}
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//创建套接字，此时套接字并不马上分为服务端和客户端。如果紧接着调用 bind,listen 函数，将成为服务器套接字
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//如果调用 connect 函数，将成为客户端套接字
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//若前两个参数使用PF_INET 和 SOCK_STREAM，则可以省略第三个参数 IPPROTO_TCP
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sock = socket(PF_INET, SOCK_STREAM, 0);
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if (sock == -1)
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error_handling("socket() error");
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memset(&serv_addr, 0, sizeof(serv_addr));
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serv_addr.sin_family = AF_INET;
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serv_addr.sin_addr.s_addr = inet_addr(argv[1]);
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serv_addr.sin_port = htons(atoi(argv[2]));
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//调用 connect 函数向服务器发送连接请求
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if (connect(sock, (struct sockaddr *)&serv_addr, sizeof(serv_addr)) == -1)
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error_handling("connect() error!");
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//当read函数返回0的时候条件为假，跳出循环。
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while (read_len = read(sock, &message[idx++], 1))
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{
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if (read_len == -1)
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error_handling("read() error!");
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str_len += read_len;
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}
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printf("Message from server : %s \n", message);
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printf("Function read call count: %d \n", str_len);
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close(sock);
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return 0;
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}
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void error_handling(char *message)
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{
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fputs(message, stderr);
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fputc('\n', stderr);
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exit(1);
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} |