我已经开始使用SOCK_STREAM类型的UNIX域套接字实现服务器 - 客户端模型。
提前致谢
答案 0 :(得分:0)
如果您的套接字已经连接,您需要避免再次连接,您可以在客户端代码中保留一些标志,表明您的客户端套接字已经连接,基于该跳过再次连接。
我已经在下面编辑了你的服务器代码,以显示我想在评论中说的内容(你需要将已接受的fd放入选择的阅读集中,以便你可以检查任何客户发布的任何数据,你也有多个客户端连接到你所以你必须在数组中保持接受的套接字):
int cltfdlen = 0;
int cltfds[FD_SETSIZE];
int maxFD = sockfd;
int sun_path_size = sizeof(client_address.sun_path);
client_address.sun_family = AF_UNIX;
strncpy(client_address.sun_path, SOCKET_NAME, sun_path_size);
client_len = sizeof(client_address);
cli_interval.tv_sec = 60;
cli_interval.tv_usec = 0;
while (1) {
FD_ZERO(&read_fds);
FD_SET(sockfd, &read_fds);
for(i=0;i<cltfdlen;cltfdlen++)
FD_SET(cltfds[i], &read_fds);
int activity = select(maxFD + 1, &read_fds, NULL, NULL, &cli_interval);
if ((activity < 0) && (errno !=EINTR)) {
printf("socket select failed errno %d\n", errno);
return 1;
}
if (FD_ISSET(sockfd, &read_fds)) {
cli_sockfd = accept(sockfd,
(struct sockaddr *)&client_address,
&client_len);
if(cli_sockfd < 0) {
printf("accept from IPC socket failed");
return 1;
}
else
{
cltfds[cltfdlen++] = cli_sockfd;
if(maxFD < cli_sockfd)
maxFD = cli_sockfd
continue;
}
}
msg = (msg_t *) malloc(sizeof(msg_t));
if (msg == NULL) {
printf("Memory allocation failed for msg");
close(ipc_sockfd);
ipc_sockfd = -1;
return 1;
}
memset(msg, 0, sizeof(msg));
for(i=0;i<cltfdlen;i++)
{
if(FD_ISSET(cltfds[i], &read_fds))
{
if (read(cltfds[i], (void *)msg, sizeof(msg_t)) == -1) {
printf("Read from IPC socket failed");
return 1;
}
}
}
close(cli_sockfd);
cli_sockfd = -1;
}