Issue 18095: unable to invoke socket.connect with AF_UNSPEC

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This issue has been migrated to GitHub: https://github.com/python/cpython/issues/62295

classification

Title:	unable to invoke socket.connect with AF_UNSPEC
Type:	behavior	Stage:
Components:	IO	Versions:	Python 3.3

process

Status:	open	Resolution:
Dependencies:		Superseder:
Assigned To:		Nosy List:	Roman.Valov, giampaolo.rodola, marto1
Priority:	normal	Keywords:

Created on 2013-05-29 14:07 by Roman.Valov, last changed 2022-04-11 14:57 by admin.

Messages (2)
msg190308 - (view)	Author: Roman Valov (Roman.Valov)	Date: 2013-05-29 14:07
There is a way to "disconnect" UDP socket that was previously "connected" to specific remote endpoint in C: struct sockaddr_in sin; memset((char )&sin, 0, sizeof(sin)); sin.sin_family = AF_UNSPEC; connect(fd, (struct sockaddr )&sin, sizeof(sin)); However in this is not available in python, since connect accepts only (host, port) as a parameter for UDP socket. It's possible to drop "port" connection with port=0, however I can't find a way to drop "host" connection.
msg192479 - (view)	Author: Martin Gergov (marto1)	Date: 2013-07-06 18:34
--- a/Modules/socketmodule.c Tue Jul 02 09:07:53 2013 -0400 +++ b/Modules/socketmodule.c Sat Jul 06 21:08:40 2013 +0300 @@ -3673,6 +3673,15 @@ { int how; int res; + struct sockaddr_in sin; + if (s->sock_type == SOCK_DGRAM){ + memset((char )&sin, 0, sizeof(sin)); + sin.sin_family = AF_UNSPEC; + Py_BEGIN_ALLOW_THREADS + res = connect(s->sock_fd, (struct sockaddr )&sin, sizeof(sin)); + Py_END_ALLOW_THREADS + return Py_None; + } how = _PyLong_AsInt(arg); if (how == -1 && PyErr_Occurred()) The shutdown method seems a suitable candidate, but a disconnect() method(which is semantically more correct) could be introduced.