Socket.sock invalid value

[wrobell]

According to nn_socket man page, the function returns file descriptor, so Socket.sock attribute should reflect this.

If we run

import nnpy 

sub = nnpy.Socket(nnpy.AF_SP, nnpy.PUB)
sub.bind('tcp://*:5555')
print(sub.sock)

The 0 will be printed.

strace gives the following in its output for above script

$ grep -e ^socket -e ^bind log           
socket(AF_INET, SOCK_STREAM|SOCK_CLOEXEC, IPPROTO_IP) = 7
bind(7, {sa_family=AF_INET, sin_port=htons(5555), sin_addr=inet_addr("0.0.0.0")}, 16) = 0

So Socket.sock should be 7, not 0.

[wrobell]

I have just read the nn_socket man page more carefully

Note that file descriptors returned by nn_socket function are not standard file descriptors and will exhibit undefined behaviour when used with system functions. Moreover, it may happen that a system file descriptor and file descriptor of an SP socket will incidentally collide (be equal).

http://nanomsg.org/v1.0.0/nn_socket.3.html

This issue is invalid.