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Re: [Bug-wget] flock is not available on solaris 10 (at least sparc)


From: Dagobert Michelsen
Subject: Re: [Bug-wget] flock is not available on solaris 10 (at least sparc)
Date: Wed, 16 Dec 2015 10:54:44 +0100

Hi Tim,

Am 16.12.2015 um 10:52 schrieb Tim Ruehsen <address@hidden>:
> On Wednesday 16 December 2015 10:31:33 Giuseppe Scrivano wrote:
>> the gnulib documentation for flock says:
>> 
>>  Portability problems not fixed by Gnulib:
>> 
>>    This function is missing on some platforms:
>>    AIX 5.1, HP-UX 11.23, Solaris 11 2011-11, BeOS.
>> 
>> This can either be because nobody cared before, or because there is no
>> way to emulate it on these platforms.
>> 
>> Couldn't we replace the flock part with a write to a tmp file+atomic
>> rename?  In the remote case of two wget processes trying to write the
>> same file, at least we won't get garbage there.  What do you think?
> 
> There is no atomic rename for all OSes, AFAIK.
> 
> How about using fcntl() for locking ? The gnulib emulation might be better and
> it is a POSIX function.

This is the suggested workaround on Solaris and also more POSIX-compliant:
  http://www.perkin.org.uk/posts/solaris-portability-flock.html


Best regards

  — Dago

--
"You don't become great by trying to be great, you become great by wanting to 
do something,
and then doing it so hard that you become great in the process." - xkcd #896

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