Hi, the socket.setsockopt(level, optname, value) method has two calling variants. When it is called with a buffer-like object as value, it calls the C API function setsockopt() with optval=buffer.buf and optlen=buffer.len. When value is an integer, setsockopt() packs it as int32 and sends it with optlen=4.
--- # example.py import socket sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM) sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, b'\x00\x00\x00\x00') sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1) --- $ strace -e setsockopt ./python example.py setsockopt(3, SOL_SOCKET, SO_REUSEADDR, [0], 4) = 0 setsockopt(3, SOL_SOCKET, SO_REUSEADDR, [1], 4) = 0 For AF_ALG (Linux Kernel crypto) I need a way to call the C API function setsockopt() with optval=NULL and optlen as any arbitrary number. I have been playing with multiple ideas. So far I liked the idea of value=(None, int) most. setsockopt(socket.SOL_ALG, socket.ALG_SET_AEAD_AUTHSIZE, (None, taglen)) What do you think? Christian _______________________________________________ Python-Dev mailing list Python-Dev@python.org https://mail.python.org/mailman/listinfo/python-dev Unsubscribe: https://mail.python.org/mailman/options/python-dev/archive%40mail-archive.com