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Re: [gpsd-dev] regression test puzling non-failure which should probably
From: |
Eric S. Raymond |
Subject: |
Re: [gpsd-dev] regression test puzling non-failure which should probably fail |
Date: |
Sat, 31 Jan 2015 13:28:27 -0500 |
User-agent: |
Mutt/1.5.23 (2014-03-12) |
Hal Murray <address@hidden>:
>
> address@hidden said:
> >> Isn't there a way of asking the system to pick an unused port
> >> number and then getting it to tell you the one it assigned?
>
> > If there is, I don't know of it.
>
> If you specify a port number of 0, it assigns one for you.
>
> >From the man page for bind:
> EADDRINUSE
> (Internet domain sockets) The port number was specified as zero
> in the socket address structure, but, upon attempting to bind to
> an ephemeral port, it was determined that all port numbers in
> the ephemeral port range are currently in use. See the
> discusâ
> sion of /proc/sys/net/ipv4/ip_local_port_range ip(7).
>
> >From the man page for ip:
> When listen(2) is called on an
> unbound socket, the socket is automatically bound to a random free port
> with the local address set to INADDR_ANY.
>
> I think getsockname can be used to retrieve the local address.
>
> -------
>
> >From the NetBSD man page for getsockname:
>
> Common uses of this function are as follows:
>
> o When bind(2) is called with a port number of 0 (indicating the kernel
> should pick an ephemeral port) getsockname() is used to retrieve the
> kernel-assigned port number.
Thanks. Remains to be seen how to use this in a Python context.
--
<a href="http://www.catb.org/~esr/">Eric S. Raymond</a>
- Re: [gpsd-dev] regression test puzling non-failure which should probably fail, (continued)
- Re: [gpsd-dev] regression test puzling non-failure which should probably fail, Greg Troxel, 2015/01/29
- Re: [gpsd-dev] regression test puzling non-failure which should probably fail, Hal Murray, 2015/01/29
- Re: [gpsd-dev] regression test puzling non-failure which should probably fail, Eric S. Raymond, 2015/01/29
- Re: [gpsd-dev] regression test puzling non-failure which should probably fail, Greg Troxel, 2015/01/30
- Re: [gpsd-dev] regression test puzling non-failure which should probably fail, Eric S. Raymond, 2015/01/30
- Re: [gpsd-dev] regression test puzling non-failure which should probably fail, Greg Troxel, 2015/01/30
- Re: [gpsd-dev] regression test puzling non-failure which should probably fail, Eric S. Raymond, 2015/01/30
- Re: [gpsd-dev] regression test puzling non-failure which should probably fail, Hal Murray, 2015/01/30
- Re: [gpsd-dev] regression test puzling non-failure which should probably fail, Eric S. Raymond, 2015/01/30
- Re: [gpsd-dev] regression test puzling non-failure which should probably fail, Hal Murray, 2015/01/30
- Re: [gpsd-dev] regression test puzling non-failure which should probably fail,
Eric S. Raymond <=