I feel this misses a point or two. flock() came from BSD. F_SETLK came from system v (iirc). flock() was too limited (no fine granularity), and F_SETLK was broken by design. And Mand locking never worked properly on Linux (or anywhere(?)). F_OFD_SETLK attempts to improve on both.
the unix philosophy is about composing small orthogonal features in flexible ways, like lockf and flock and fcntl(F_SETLK) and fcntl(F_OFD_SETLCK) and "mandatory locking" but only if present in the kernel and the fs is mounted with "-o mand" or MS_MANDLOCK and SGID is set but not
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Yes it's the Unix philosophy that everything is a file lock.
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orthogonal means none of them are compatible with each other, right?
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In all fairness, this was implemented badly originally, and subsequent "improvements" were targeted at fixing local problems. "Polishing a turd" is really the right expression.
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does “this” refer to linux?
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File locking. The svr4 interface got fd behavior all wrong, almost everyone got it wrong over NFS (but not Solaris 7 and after iirc). BSD version was ok, but ignored NFS. Hard to use and error prone as a result.
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Yeah but then
@mkerrisk documents everything and teaches classes!Thanks. Twitter will use this to make your timeline better. UndoUndo
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That’s the difference between a philosophy and a discipline.
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i've been using git as my go-to example of the unix philosophy, this is as good
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useradd/adduser heh
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andy this is a very good tweet
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Luckily curse day only hit the brain this year. Could have been worse!
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don't forget MAP_DENYWRITE, which is present in all(?) linux kernels and effectively produces mandatory locking
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The joys of endless compatibility. Always be deprecating.
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Unix: LOCK ALL THE THINGS!
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There's a fairly common development philosophy that focusses on making the easy things easier while the hard things get harder. Unix style development may appear fragmented but at least there's a noticeable tendency toward making hard things easier.
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So you write some
#ifdefs which you hope will abstract the beastliness. Now it's your problem!Thanks. Twitter will use this to make your timeline better. UndoUndo
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Picky picky picky
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