New subject: [Bug 59787] macos (socket): select malfunctioning when recv on closed socket (common HTTP usage)

May 24, 2026

      http://bugs.winehq.org/show_bug.cgi?id=59787

            Bug ID: 59787
           Summary: macos (socket): select malfunctioning when recv on
                    closed socket (common HTTP usage)
           Product: Wine
           Version: unspecified
          Hardware: x86-64
                OS: MacOS
            Status: UNCONFIRMED
          Severity: major
          Priority: P2
         Component: winsock
          Assignee: wine-bugs@list.winehq.org
          Reporter: kr4uzi@gmail.com

Created attachment 81010
  --> http://bugs.winehq.org/attachment.cgi?id=81010
patch, demo.c and Makefile

First discovered on macOS with Battlefield 2 online accounts (the login doesn't
proceed).
Underlying issue: If a ::select is done on a socket that can be ::recv'ed from,
but is already closed at that time, the socket will be part of the
except-fd_set.

This does *not* happen under linux (or windows). I have attached a patch for
the wineserver that fixes it under my machine and also a proof of concept to
show the deviation between wine, linux and native.

This being said: The Quality of this is "it works on my machine" and I do not
have sufficient knowledge of the macos/linux polling mechanism to evaluate it
properly.

--------------
Proof-Of-Concept (pseudo code):
--------------
s = socket(IPv4, TCP);
connect(s, "bf2web.gamespy.com")

select(s, null, &canwrite, &hasexception);
send(s, "GET /ASP/ge.....")

for i in 0..2:
select(s, &canread, null, &hasexception)
recv(s)
--------------
--------------
Results
--------------
--------------
Native:
--------------
select (write): res=1 write=1 except=1
send: res=147
select (read): res=1 read=1 except=0
recv: res=71
select (read): res=1 read=1 except=0
recv: res=0
--------------
--------------
wine:
--------------
select (write): res=1 write=1 except=1
send: res=147
select (read): res=2 read=1 except=1
recv: res=71
select (read): res=2 read=1 except=1
recv: res=0
--------------
--------------
wine (patched):
--------------
select (write): res=1 write=1 except=1
send: res=147
select (read): res=1 read=1 except=0
recv: res=71
select (read): res=1 read=1 except=0
recv: res=0

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[Bug 59787] New: macos (socket): select malfunctioning when recv on closed socket (common HTTP usage)

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