mirror of
https://github.com/riba2534/TCP-IP-NetworkNote.git
synced 2026-02-03 01:53:19 +08:00
74 lines
1.7 KiB
C
74 lines
1.7 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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#define BUF_SIZE 30
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void error_handling(char *message);
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void read_routine(int sock, char *buf);
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void write_routine(int sock, char *buf);
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int main(int argc, char *argv[])
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{
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int sock;
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pid_t pid;
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char buf[BUF_SIZE];
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struct sockaddr_in serv_adr;
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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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sock = socket(PF_INET, SOCK_STREAM, 0);
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memset(&serv_adr, 0, sizeof(serv_adr));
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serv_adr.sin_family = AF_INET;
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serv_adr.sin_addr.s_addr = inet_addr(argv[1]);
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serv_adr.sin_port = htons(atoi(argv[2]));
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if (connect(sock, (struct sockaddr *)&serv_adr, sizeof(serv_adr)) == -1)
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error_handling("connect() error!");
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pid = fork();
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if (pid == 0)
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write_routine(sock, buf);
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else
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read_routine(sock, buf);
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close(sock);
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return 0;
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}
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void read_routine(int sock, char *buf)
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{
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while (1)
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{
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int str_len = read(sock, buf, BUF_SIZE);
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if (str_len == 0)
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return;
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buf[str_len] = 0;
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printf("Message from server: %s", buf);
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}
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}
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void write_routine(int sock, char *buf)
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{
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while (1)
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{
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fgets(buf, BUF_SIZE, stdin);
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if (!strcmp(buf, "q\n") || !strcmp(buf, "Q\n"))
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{
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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
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return;
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}
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write(sock, buf, strlen(buf));
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}
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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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} |