Date: Fri, 14 Jun 2002 16:36:57 +0300 From: Giorgos Keramidas <keramida@ceid.upatras.gr> To: Mario Sergio Fujikawa Ferreira <lioux@FreeBSD.org> Cc: Garance A Drosihn <drosih@rpi.edu>, FreeBSD-arch@FreeBSD.org, msmith@FreeBSD.org Subject: Re: Adding SO_NOSIGPIPE to -STABLE/-CURRENT Message-ID: <20020614133656.GB9021@hades.hell.gr> In-Reply-To: <20020614054920.1254.qmail@exxodus.fedaykin.here> References: <20020614022304.94570.qmail@exxodus.fedaykin.here> <p05111775b92f06977bcb@[128.113.24.47]> <20020614054920.1254.qmail@exxodus.fedaykin.here>
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On 2002-06-14 02:48 -0300, Mario Sergio Fujikawa Ferreira wrote:
> Darwin call it SOF_NOSIGPIPE because they use it as socket
> flag as opposed to a socket option such as either SO_DONTTRUNC or
> SO_WANTMORE.
>
> Well, Linux has it as a socket option, it looks okay
> as a socket option so the name begins with SO_. SO_NOSIGPIPE
> because it describes well its use as it does in Darwin.
>
> However, that's my opinion. I am all open to suggestions.
The example you mentioned above (threaded programs that want to
disable the signal for some of the threads, but not all of them) can
probably be implemented in userland with:
void
sigpipe_handler (int signo)
{
if (we are a thread that needs sigpipe) {
do something;
}
}
One might argue that an option like SO_NOSIGPIPE will be faster and
save all the threads from checking the same thing though, and I will
agree with that. If you give a name to this option though, please
don't make its use depend on a 'double negative'. It would be a lot
better to have this option enabled by default, and call it SO_SIGPIPE.
Then you don't have to "disable a NO_FOO" option, to "enable FOO".
The only option that uses a similar negative meaning right now is
SO_DONTROUTE, while all the rest are of the style "set SO_FOO to
enable behavior bar".
- Giorgos
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