Experimental Physics and
Industrial Control System

On 7/8/19 8:05 PM, Michael Davidsaver wrote:
> Sorry for the stream of consciousness (aka ramble).  I've been digging into
> this all day.  I thought I'd see if anyone else has run across
> this situation before.

part 2?


I did an experiment on interrupting recvfrom() on a UDP socket.
Also accept() or recv() with a TCP socket.  Used travis-ci VM for Linux
and OSX.  Appveyor VM for windows.


TCP recv()

Linux - shutdown(SHUT_RDWR) returns 0 and interrupts.  recv() returns 0.

OSX - same as Linux

Windows - shutdown(SHUT_RDWR) returns 0 and interrupts!  recv() returns WinError 10038 (not a socket)


So for the case which really matters, shutdown() appears to work on all three.  (also RTEMS and presumably vxworks)
bye bye epicsSocketSystemCallInterruptMechanismQuery() ?


TCP accept()

Linux - shutdown(SHUT_RDWR) returns 0 and interrupts.  accept() returns EINVAL

OSX - shutdown() errors and does not interrupt.  close() interrupts.  accept() returns EBADR

Windows - shutdown() errors and does not interrupt.  close() interrupts.  accept() returns WinError 10038 (not a socket)


UDP recvfrom()

Linux - shutdown(SHUT_RDWR) returns 0 and interrupts.  recvfrom() returns 0 (ambiguous w/ valid UDP zero length packet)

OSX - shutdown() errors and does not interrupt.  close() interrupts, and recvfrom() returns EBADF

Windows - shutdown() succeeds and interrupts.  recvfrom() returns WinError 10022 (invalid argument)

References:

socket shutdown races? Michael Davidsaver via Core-talk

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