pespin has posted comments on this change. ( 
https://gerrit.osmocom.org/c/libosmocore/+/31808 )

Change subject: select: Optimize osmo_fd_get_by_fd
......................................................................


Patch Set 1:

(1 comment)

File src/core/select.c:

https://gerrit.osmocom.org/c/libosmocore/+/31808/comment/cd9f53ae_52bfc27f
PS1, Line 223:  if (fd->fd >= 0)
Here I'd like to have an OSMO_ASSERT(fd->fd >=0) instead, but that made one 
unit test in osmo-mgw hit the assert: 
https://gerrit.osmocom.org/c/osmo-mgw/+/31806
Other projects are running fine so far (A previous patch for libosmocore also 
fixes one related issue heating this assert).

Even if that makes older osmo-mgw assert, I think it is still acceptable 
because it is actually detecting a bug in osmo-mgw.
Users of the osmo_fd API shouldn't change the fd value while the osmo_fd is 
registered, that's calling for a potential mess.
This actually even causes bugs inside libosmocore before this patch, see call 
to osmo_stats_tcp_osmo_fd_unregister(fd) just below, which will probably leak 
due to not finding the fd because it has been set to -1 prior to unregistering.

So, do others agree I should use an OSMO_ASSERT there? this will help in 
finding bugs during development time by hitting the assert, rather than ending 
up with fucked up silently at production time.



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Gerrit-Project: libosmocore
Gerrit-Branch: master
Gerrit-Change-Id: I8b71547df8bed84192cb160479fa3debf9b7eade
Gerrit-Change-Number: 31808
Gerrit-PatchSet: 1
Gerrit-Owner: pespin <[email protected]>
Gerrit-Reviewer: Jenkins Builder
Gerrit-Comment-Date: Thu, 09 Mar 2023 17:50:03 +0000
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