Attention is currently required from: jolly, laforge.

pespin has posted comments on this change. ( 
https://gerrit.osmocom.org/c/libosmocore/+/35910?usp=email )

Change subject: osmo_io: Use poll/select to notify socket connection at 
osmo_io_uring.c
......................................................................


Patch Set 4:

(4 comments)

File src/core/osmo_io_uring.c:

https://gerrit.osmocom.org/c/libosmocore/+/35910/comment/62900f2c_f007201e
PS4, Line 327:  if (osmo_fd_is_registered(&iofd->u.uring.connect_ofd))
Again this is expensive! Should be removed (or conditionally enabled through 
ifdef).


https://gerrit.osmocom.org/c/libosmocore/+/35910/comment/0b38f7db_8c1db15b
PS4, Line 341:  if (osmo_fd_is_registered(&iofd->u.uring.connect_ofd))
Again this is expensive! Should be removed (or conditionally enabled through 
ifdef).


https://gerrit.osmocom.org/c/libosmocore/+/35910/comment/6ebeb0dc_70109e55
PS4, Line 398:  if (osmo_fd_is_registered(&iofd->u.uring.connect_ofd))
Again this is expensive! Should be removed (or conditionally enabled through 
ifdef).


https://gerrit.osmocom.org/c/libosmocore/+/35910/comment/cd75808a_4abffff4 
PS4, Line 498:          /* Use a temporary osmo_fd which we can use to notify 
us once the connection is established
I am not sure this is correct. According to man2 connect, the way to go is:
"""
             The  socket is nonblocking and the connection cannot be completed 
immediately.  (UNIX domain sockets failed with EAGAIN instead.)  It is pos‐
              sible to select(2) or poll(2) for completion by selecting the 
socket for writing.  After select(2) indicates writability,  use  getsockopt(2)
              to  read  the  SO_ERROR option at level SOL_SOCKET to determine 
whether connect() completed successfully (SO_ERROR is zero) or unsuccessfully
              (SO_ERROR is one of the usual error codes listed here, explaining 
the reason for the failure).
"""

I don't see anywhere the mention of "fd becoming readable" as you said.
Seems you should be checking the SO_ERROR instead?



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Gerrit-Project: libosmocore
Gerrit-Branch: master
Gerrit-Change-Id: I4eca9ea72beb0d6ea4d44cce81ed620033f07270
Gerrit-Change-Number: 35910
Gerrit-PatchSet: 4
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