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From: Rich Felker <dalias@aerifal.cx>
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Subject: Re: openssh and sendmsg() problem
Date: Tue, 26 Jun 2012 17:13:19 -0400
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On Tue, Jun 26, 2012 at 10:40:16PM +0200, Szabolcs Nagy wrote:
> > And kernel too.
> > 
> > Both they define incompatible msghdr and cmsghdr structs.
> > The problem sits in cmsghdr struct, changing it's first member type to
> > 'size_t' solves openssh issue.
> 
> so the issue is that the kernel and glibc uses size_t for socklen_t
> in struct msghdr and struct cmsghdr as well
> 
> musl fixes msghdr but not cmsghdr
> (by using int + padding)
> 
> where is it specified in posix that socklen_t should be unsigned int?
> it seems using size_t would make things easier..

Yes it would be easier, but unfortunately it's part of the LSB types
ABI and presumably the Linux kernel ABI...

Rich