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Message-ID: <878q8k9m8u.fsf@alyssa.is>
Date: Fri, 12 Jun 2026 10:49:37 +0200
From: Alyssa Ross <hi@...ssa.is>
To: Thorsten Glaser <tg@...bsd.de>, musl@...ts.openwall.com
Subject: Re: Why do sendmmsg and recvmmsg take unsigned int flags?
Thorsten Glaser <tg@...bsd.de> writes:
> On Fri, 12 Jun 2026, Alyssa Ross wrote:
>
>>A little bit more research: it's int on OpenBSD, bionic and uClibc-ng as
>>well, but unsigned int on NetBSD. macOS has a different interface
>>entirely.
>
> Hmm.
>
> TFM says it takes the same flags as sendmsg(2).
>
> Is that unsigned on NetBSD? What does Mac OSX have for sendmsg?
> POSIX has:
> ssize_t sendmsg(int socket, const struct msghdr *message, int flags);
From what I can tell from online man pages, NetBSD and macOS use the standard
prototype for sendmsg.
One further peculiarity is that FreeBSD's and uClibc-ng's sendmmsg
implementations return ssize_t, while every other implementation returns int.
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