Antoine Pitrou <[email protected]> added the comment:
Looking at it again, there's the question of accept() behaviour. In the
original code, it will call internal_setblocking() on the new fd if the
listening socket is non-blocking. In the new code, if SOCK_NONBLOCK is defined
it will not call any OS function to set the new fd in non-blocking mode.
Here is what the man page has to say:
On Linux, the new socket returned by accept() does not inherit file
status flags such as
O_NONBLOCK and O_ASYNC from the listening socket. This behavior differs
from the canonical
BSD sockets implementation. Portable programs should not rely on
inheritance or non-inher‐
itance of file status flags and always explicitly set all required
flags on the socket
returned from accept().
Linux has defined accept4() precisely for this purpose:
If flags is 0, then accept4() is the same as accept(). The following
values can be bitwise
ORed in flags to obtain different behavior:
SOCK_NONBLOCK Set the O_NONBLOCK file status flag on the new open
file description.
Using this flag saves extra calls to fcntl(2) to achieve
the same result.
SOCK_CLOEXEC Set the close-on-exec (FD_CLOEXEC) flag on the new
file descriptor. See
the description of the O_CLOEXEC flag in open(2) for
reasons why this may
be useful.
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<http://bugs.python.org/issue7523>
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