Several problems Socket Programming A socket procedures, recently found a rather strange question : 1. As a server, the client is connected to select acceptable mistake to withdraw from the process at this time errno to EBADF [code] 4003rd set up multi-select IO wait time Select_time.tv_sec = 1; Select_time.tv_usec = 0 4003rd installed select a mistake waiting time Sleeptime.tv_sec = 1; Sleeptime.tv_usec = 0 FD_ZERO (&rfds); FD_SET (port_fd, &rfds); Int nfds port_fd + = 1; 4003rd I/O multiplexing, waiting to be ready for any descriptors Rc = select (nfds, &rfds, NULL, NULL, &select_time); If (rc ====== 1) { Switch (errno)         { EBADF case : 4003rd from the mistakes Break; EINTR case : Continue;                 ... Default : Continue;         } }[/code] 2. As a client to connect to a certain address, a port success and then withdraw from (close to the corresponding socket descriptor), but not able to successfully connect calls to the socket The close link, I used to check the pfiles process, finding the corresponding address and port are still in use. We do not know whether the prawn encountered similar situations? [ Closed window ]