> Come down to the details, I am having trouble using select() a
> read/write file descriptor to make BIO_do_connect a non-blocking call,
> before BIO_do_connect() returns, BIO_get_fd() will return -1. Without a
> file descriptor, how can I use select()?
Now that I think about, maybe your misunderstanding is elsewhere. You talk
about "using select()" to "make BIO_do_connect a non-blocking call". The
'select' function has no effect on whether an operation blocks or not and
cannot make a blocking function non-blocking. In the usual context, you use
'fcntl' or 'setsockopt' to do this. For SSL BIOs, you can use BIO_set_nbio
for this purpose.
My man pages say:
BIO_set_nbio() sets the non blocking I/O flag to n. If n is zero then
blocking I/O is set. If n is 1 then non blocking I/O is set. Blocking
I/O is the default. The call to BIO_set_nbio() should be made before
the connection is established because non blocking I/O is set during
the connect process.
...
BIO_do_connect() attempts to connect the supplied BIO. It returns 1
if
the connection was established successfully. A zero or negative value
is returned if the connection could not be established, the call
BIO_should_retry() should be used for non blocking connect BIOs to
determine if the call should be retried.
As I said previously, you must not call 'select' until directed to do so.
For example, 'BIO_should_retry' can direct you to do so.
DS
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