在linux的socket编程中，经常会遇到超时设置的问题，例如请求方如果在Ks内不发送数据则服务器要断开连接停止服务。这里我使用select的io复用实现超时5s设置，具体代码片段如下：
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fd_set fs;timeval tv;tv.tv_sec = 5;tv.tv_usec = 0;FD_ZERO(&fs);FD_SET(socket_fd,&fs);int ret = select(socket_fd+1,&fs,NULL,NULL,&tv);if(ret == -1){ fprintf(stderr, "socket_job:run:error.\n");}else
if(ret == 0){ fprintf(stderr, "socket_job:run:time out.\n");}else{ if(FD_ISSET(socket_fd,&fs)){ int
length = 1024*1024; char* buffer = new
char[length]; memset(buffer,0,sizeof(char)*length); int
n = recv(socket_fd,buffer,sizeof(char)*length,0); if(n > 0){ //deal msg buffer[length] = ‘\0‘; search_collector* searcher = new
search_collector(); string result(""); searcher->search(buffer,10,result); //send result,result must be end with \n int
result_length = strlen(result.c_str()); ret = send(socket_fd,result.c_str(),result_length,0); int
all_send = 0; while(ret > 0 && ret < result_length){ result_length -= ret; all_send += ret; ret = send(socket_fd,result.c_str()+all_send,result_length,0); } } delete[] buffer;} } |
使用select io复用实现超时设置,布布扣,bubuko.com
原文：http://www.cnblogs.com/clyskyblue/p/3572379.html