mirror of
https://github.com/riba2534/TCP-IP-NetworkNote.git
synced 2026-02-03 01:53:19 +08:00
74 lines
1.9 KiB
C
74 lines
1.9 KiB
C
#include <stdio.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <string.h>
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#include <signal.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <fcntl.h>
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#define BUF_SIZE 30
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void error_handling(char *message);
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void urg_handler(int signo);
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int acpt_sock;
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int recv_sock;
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int main(int argc, char *argv[])
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{
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struct sockaddr_in recv_adr, serv_adr;
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int str_len, state;
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socklen_t serv_adr_sz;
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struct sigaction act;
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char buf[BUF_SIZE];
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if (argc != 2)
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{
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printf("Usage : %s <port>\n", argv[0]);
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exit(1);
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}
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act.sa_handler = urg_handler;
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sigemptyset(&act.sa_mask);
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act.sa_flags = 0;
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acpt_sock = socket(PF_INET, SOCK_STREAM, 0);
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memset(&recv_adr, 0, sizeof(recv_adr));
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recv_adr.sin_family = AF_INET;
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recv_adr.sin_addr.s_addr = htonl(INADDR_ANY);
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recv_adr.sin_port = htons(atoi(argv[1]));
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if (bind(acpt_sock, (struct sockaddr *)&recv_adr, sizeof(recv_adr)) == -1)
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error_handling("bind() error");
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listen(acpt_sock, 5);
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serv_adr_sz = sizeof(serv_adr);
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recv_sock = accept(acpt_sock, (struct sockaddr *)&serv_adr, &serv_adr_sz);
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//将文件描述符 recv_sock 指向的套接字拥有者（F_SETOWN）改为把getpid函数返回值用做id的进程
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fcntl(recv_sock, F_SETOWN, getpid());
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state = sigaction(SIGURG, &act, 0); //SIGURG 是一个信号，当接收到 MSG_OOB 紧急消息时，系统产生SIGURG信号
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while ((str_len = recv(recv_sock, buf, sizeof(buf), 0)) != 0)
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{
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if (str_len == -1)
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continue;
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buf[str_len] = 0;
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puts(buf);
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}
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close(recv_sock);
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close(acpt_sock);
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return 0;
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}
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void urg_handler(int signo)
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{
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int str_len;
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char buf[BUF_SIZE];
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str_len = recv(recv_sock, buf, sizeof(buf) - 1, MSG_OOB);
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buf[str_len] = 0;
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printf("Urgent message: %s \n", buf);
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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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} |