Experimental Physics and
Industrial Control System

Benjamin Franksen <[email protected]> · Fri, 18 Nov 2005 15:25:58 +0100

Jeff,

I discovered a problem. I wrongly claimed that I successfully tested a 
soft ioc runnign on HP-UX. I must have missed something -- in fact it 
doesn't even work in (unchanged) R3.14.7. The symptom is:

iocLogInit
log client: Unable to connect to "193.149.12.184:7004" because 
0="Operation now in progress"

Note: the text in this message corresponds to errno=EINPROGRESS, whereas 
the reported errno is 0. 

I am stupefied as to how this is possible.

The code that gives this message is in logClientConnect(). It connects 
and in case of a negatie return value, makes a copy of errno. Then it 
checks the errno copy for various values and on SOCK_EISCONN decides 
that we are connected.

A 'fix' that seems to work (on vxWorks-68040, linux-x86 and HP-UX) is to 
check if errno is 0 (zero) (even if the return code is negative) and 
assume a successful connect in this case. That is, treat errno==zero 
the same as errno==EISCONN.

Any thoughts, comments, suggestions?

Cheers,
Ben

PS: I attached the latest version.

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System