[Discuss] Making read() non-restartable

[noel at natnix.com]

Interesting question!  What are you reading from?  A file?  socket?  How
do you know that read doesn't get interrupted?  You will only get EINTR
if read was interrupted before it read anything.  If read() gets n bytes
before an interrupt, it will return n.

If you're using perl, are you using read() or sysread()?

--Noel



On Tue, Dec 05, 2006 at 10:41:45AM -0800, Peter Scott wrote:
> I may be a bit out of my depth here, but I have at least (tried to) 
> read Stevens on the subject.  It appears that read() is restartable by 
> default.  I want it to not be restarted after SIGALRM.  How/can I do 
> that?  It's getting restarted even though SA_RESTART was not specified 
> in sigaction().  And SA_INTERRUPT is a no-op according to 
> bits/sigaction.h.  (Yeah, I'm doing it in Perl, but I straced it so I 
> could see the system calls and that's where I see read() returning 
> ERESTARTSYS.)
> -- 
> Peter Scott
> Pacific Systems Design Technologies
> http://www.perldebugged.com/
> http://www.perlmedic.com/
> 
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