服务器,如果出错返回-1,否则返回socket处理代码 * server:服务器地址(域名或者IP),serverport:端口 * ***/ int connect_socket(char * server,int serverPort){ int sockfd=0; struct sockaddr_in addr; struct hostent * phost; //向系统注册,通知系统建立一个通信端口 //AF_INET表示使用IPv4协议 //SOCK...
Socket Programming之select非阻塞(C语言) codingcyx关注IP属地: 陕西 0.0632018.04.01 23:15:13字数6阅读1,612 server.c: #include <stdio.h> #include <stdlib.h> #include <netinet/in.h> #include <sys/socket.h> #include <arpa/inet.h> #include <string.h> #include <unistd.h> #define BACK...
ThefunctionofSelectformat(thatistheUnixsystemunder thesocketprogrammingunderWindowsBerkeley,andthereisthe differencebetweenadescription): Intselect(intmaxfdp,fd_set*readfds,fd_set*writefds, fd_set*errorfds,structtimeval*timeout); Thefirstdescriptionofthetwostructures: First,structfd_setcanbeunderstoodasase...
printf("Close client socket.\n"); } } } /* Sit back and wait for all child processes to exit */ while (waitpid(-1, NULL, 0) > 0); /* Close up our socket */ close(sockfd); printf("Close server socket.\n"); return 0; } /** * Simple utility function that reads a line ...
Also do not forget that those arrays are passed by reference and will be modified after socket_select() returns. 注意: Due a limitation in the current Zend Engine it is not possible to pass a constant modifier like null directly as a parameter to a function which expects this parameter ...
If the socket or file descriptor number is greater that FD_SETSIZE, the FD_* macros will produce unpredictable results. For more information, see "getdtablesize" in Chapter 18, "Socket Function Reference" of SAS/C Library Reference, Volume 2.It...
The select function allows us to monitormultiple sockets simultaneously without blocking on each socket individually. It is commonly used in network programming to handle multiple client connections efficiently. 中文回答: lwIP(轻量级IP)堆栈中的select函数用于在多个文件描述符上进行I/O操作的多路复用。它允许...
All select does is wait for one of the argument file descriptors to become readable and/or writable -- which is exactly what you need if you are waiting on a socket. May 30, 2022 at 12:09am tonic (28) Im sorry i meant the FD_SET & SELECT, that was my bad May 30, 2022 ...
max_sd=master_socket;//add child sockets to setfor(i=0;i<max_clients;i++){//socket descriptorsd=client_socket[i];//if valid socket descriptor then add to read listif(sd>0)FD_SET(sd,&readfds);//highest file descriptor number, need it for the select functionif(sd>max_sd)max_sd...
Assign socket handles to each of thefd_setsets of interest by using theFD_SETmacro. Call theselectfunction and wait until I/O activity sets one or more of the socket handles in eachfd_setset provided. Whenselectcompletes, it returns the total number of socket handles that are set in all...