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Re: SO_NOSIGPIPE option.
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Re: SO_NOSIGPIPE option.


  • Subject: Re: SO_NOSIGPIPE option.
  • From: Vincent Lubet <email@hidden>
  • Date: Wed, 7 Oct 2009 14:43:43 -0700


On Oct 7, 2009, at 2:27 PM, Glenn Anderson wrote:


One problem I ran in to with 10.5 is that setsockopt for SO_NOSIGPIPE changed from 10.4 and earlier and no longer works if the socket is already closed. This means that if the socket closes before your code gets a chance to call setsockopt, you don't check if setsockopt failed, and you write to the socket, that will generate a SIGPIPE.


As timing is usually involved to end up in a situation where the socket has closed before the call to setsockopt, this can result in hard to reproduce problems.

It is also possible the behavior of setsockopt for SO_NOSIGPIPE on a closed socket has changed back again under 10.6, I haven't tried it myself.

This is true and is a fall-out of the Unix conformance that specifies that the setsockopt(2) function shall fail with EINVAL the socket has been shut down"


To restore the old non-standard behavior, Mac OS X 10.6 SnowLeopard has a new socket option SO_NP_EXTENSIONS that allows to call setsockopt (2) after the connection is shutdown.

Vincent

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  • Follow-Ups:
    • Re: SO_NOSIGPIPE option.
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References: 
 >SO_NOSIGPIPE option. (From: Robert Bell <email@hidden>)
 >Re: SO_NOSIGPIPE option. (From: Glenn Anderson <email@hidden>)

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