On Thu, Jan 17, 2008, Yolanda Liu (liuyu) wrote: > Hi, all: > > Wondering if anybody has done something related this and give me some > suggestions. > > I am using OpenSsl library to do connection to a port. OpenSSL doesn't > provide a configurable timeout for BIO_do_connect. It is relying on the > underlying OS connection. If the port is unreachable, it will take about > 2.5 mins to timeout, just like what telnet does to a port. Looks like > the only way to do a non-blocking IO is to use select or poll. I made > read/write work after the connection is established. > Now the problem is before the connection is established. Select is based > on the file descriptor. Looks like I can't get the file descriptor > before the connect. FD_SET(BIO_get_fd(conn, &c), &rfds) BIO_get_fd > returns null. what did I do wrong? >
Call BIO_set_nbio() once after creating the BIO with BIO_new_connect(). Call BIO_do_connect() first and check its return value. If it indicates a retry is needed (see manual pages) then get the FD and select on it if necessary. If select returns before the timeout then loop round and call BIO_do_connect() again repeating until it times out or BIO_do_connect() indicates you shouldn't retry any more (success or faiure of connection). Steve. -- Dr Stephen N. Henson. Email, S/MIME and PGP keys: see homepage OpenSSL project core developer and freelance consultant. Homepage: http://www.drh-consultancy.demon.co.uk ______________________________________________________________________ OpenSSL Project http://www.openssl.org User Support Mailing List openssl-users@openssl.org Automated List Manager [EMAIL PROTECTED]
