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Date: Tue, 31 Jan 2017 12:50:25 -0600
From: William Pitcock <>
To: Harald Arnesen <>
Cc: alpine-dev <>,
Subject: Re: [alpine-devel] Non-standard C library


On Tue, Jan 31, 2017 at 12:22 PM, Harald Arnesen <> wrote:
> musl defines "IPPORT_RESERVED" in "netdb.h", while both GNU libc and BSD
> libc define it in "netinet/in.h". And I can't find an e-mail address for
> a musl developer without subscribing to their mailing list.
> This is from a conversation with Snobol maintainer Phil Budne:
>> > This one is from an old Asus EeePC 900, running AlpineLinux, which uses
>> > the musl libc instead of glibc. A compile error ('IPPORT_RESERVED'
>> > undeclared) in 'lib/auxil/bindresvport.c' was fixed by
>> > '#include <netdb.h>'
> Thanks!
> I'd report it as a bug in libc....  IPPORT_RESERVED is a property of
> on the wire protocol (or at least the local TCP stack), while
> <netdb.h> is the interface for hostname lookups.
> Linux and BSD agree the constant comes from netinet/in.h
> And charmingly, they refuse to define an ifdef so you can tell
> you're using their broken library (because they're never wrong):
> I've put this in after #include <errno.h>:
> #if !defined(IPPORT_RESERVED) && !defined(__GLIBC__)
> /*
>  * could be using broken musl libc!
>  * they refuse to identify themselves:
>  *
>  */
> #include <netdb.h>
> #endif

I checked on both a Debian and FreeBSD machine and indeed, they both
have it in netinet/in.h.

What shall we do?


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