getsockname/getpeername and semantic of the namelen parameter

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02-18-2008, 09:04 AM

Holger Freyther

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getsockname/getpeername and semantic of the namelen parameter

Hello,

I hope this is an appropriate place for the question, if not please
forgive me.

getsockname(int s, struct sockaddr *name, socklen_t *namelen);

namelen is a input and output parameter. The input case is pretty
obvious
and I'm going to skip it. For the output case I have seen two
different behaviours.

Linux and OpenSolaris copy the size of the actual in-kernel structure
into
namelen regardles of the input value of namelen.
The BSDs copy MIN(namelen,sa->sa_len) back into namelen.

The two questions I have are:
-Who is correct? OpenSolaris/Linux or XNU/OpenBSD/... POSIX.1, BSDi [1]
and others [2], [3] indicate (to me as non native speaker)
that the length
of the address as in the kernel should be set. My conclusion
is OpenSolaris
and Linux are correct.
-Is it worth fixing the BSDs to set sa_len as namelen

if you have some input on this question, can point me to a FAQ I have
missed I
would really appreciate it.

kind regards
holger

[1] BSDI getsockname man page http://www.brno.cas.cz/cgi-bin/bsdi-man?
proto=1.1&query=getsockname&msection=2&apropos=0
[2] linux man page http://www.die.net/doc/linux/man/man2/getsockname.
2.html
[3] OSX man page http://developer.apple.com/documentation/Darwin/
Reference/ManPages/man2/getsockname.2.html

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getsockname/getpeername and semantic of the namelen parameter