在C語言中,使用socket處理網絡中斷通常涉及到以下幾個方面:
send()
函數發送一個數據包,并使用recv()
函數等待接收響應。如果在規定的時間內沒有收到響應,可以認為網絡已經中斷。#include <sys/socket.h>
#include <arpa/inet.h>
#include <unistd.h>
#include <errno.h>
int check_network_interrupt(int sockfd, struct sockaddr_in *server_addr, int timeout) {
fd_set readfds;
struct timeval tv;
int ret;
FD_ZERO(&readfds);
FD_SET(sockfd, &readfds);
tv.tv_sec = timeout;
tv.tv_usec = 0;
ret = select(sockfd + 1, &readfds, NULL, NULL, &tv);
if (ret == -1) {
perror("select error");
return -1;
} else if (ret == 0) {
fprintf(stderr, "select timeout\n");
return -1;
} else {
if (FD_ISSET(sockfd, &readfds)) {
char buffer[1024];
ssize_t recv_len = recv(sockfd, buffer, sizeof(buffer) - 1, 0);
if (recv_len == -1) {
perror("recv error");
return -1;
} else if (recv_len == 0) {
fprintf(stderr, "server closed connection\n");
return -1;
} else {
buffer[recv_len] = '\0';
fprintf(stderr, "Received data: %s\n", buffer);
}
}
}
return 0;
}
void handle_network_interrupt(int sockfd) {
if (check_network_interrupt(sockfd, NULL, 5) == -1) {
fprintf(stderr, "Network interrupt detected, reconnecting...\n");
// 重新連接邏輯
}
}
int reconnect(const char *ip, int port) {
int sockfd = socket(AF_INET, SOCK_STREAM, 0);
if (sockfd == -1) {
perror("socket error");
return -1;
}
struct sockaddr_in server_addr;
memset(&server_addr, 0, sizeof(server_addr));
server_addr.sin_family = AF_INET;
server_addr.sin_port = htons(port);
if (inet_pton(AF_INET, ip, &server_addr.sin_addr) <= 0) {
perror("inet_pton error");
close(sockfd);
return -1;
}
if (connect(sockfd, (struct sockaddr *)&server_addr, sizeof(server_addr)) == -1) {
perror("connect error");
close(sockfd);
return -1;
}
return sockfd;
}
請注意,這些示例代碼僅用于演示目的,實際應用中可能需要根據具體需求進行調整。在實際編程中,還需要考慮線程安全、錯誤處理、資源釋放等問題。