From: jnc@mercury.lcs.mit.edu (Noel Chiappa)
To: tuhs@tuhs.org
Cc: jnc@mercury.lcs.mit.edu
Subject: Re: [TUHS] Unix APIs: elegant or not?
Date: Sun, 4 Nov 2018 17:37:46 -0500 (EST) [thread overview]
Message-ID: <20181104223746.4B8D018C0B6@mercury.lcs.mit.edu> (raw)
> From: Chris Hanson
> you should virtually never use read(2), only ever something like this:
> ...
> And do this for every classic system call, since virtually no client
> code should ever have to care about EINTR.
"Virtually". Maybe there are places that want to know if their read call was
interrupted; if you don't make this version available to them, how can they
tell? Leaving the user as much choice as possible is the only way to go, IMO;
why force them to do it the way _you_ think is best?
And it makes the OS simpler; any time you can move functionality out of the
OS, to the user, that's a Good Thing, IMO. There's nothing stopping people
from using the EINTR-hiding wrapper. (Does the Standard I/O library do this,
does anyone know?)
Noel
PS: Only system calls that can block can return EINTR; there are quite a few
that don't, not sure what the counts are in modern Unix.
next reply other threads:[~2018-11-04 23:08 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-11-04 22:37 Noel Chiappa [this message]
2018-11-05 4:04 ` Dave Horsfall
-- strict thread matches above, loose matches on Subject: below --
2018-11-04 22:29 Theodore Y. Ts'o
2018-11-01 15:39 Noel Chiappa
2018-10-31 4:38 Warren Toomey
2018-10-31 15:47 ` Paul Winalski
2018-10-31 17:22 ` Clem Cole
2018-10-31 19:33 ` Lawrence Stewart
2018-10-31 20:57 ` G. Branden Robinson
2018-10-31 21:31 ` Dave Horsfall
2018-11-01 7:42 ` Pierre DAVID
2018-11-01 10:20 ` Dave Horsfall
2018-11-01 12:57 ` Clem Cole
2018-11-01 14:19 ` ron minnich
2018-11-01 14:41 ` Clem Cole
2018-11-01 16:43 ` Warner Losh
2018-11-01 16:48 ` ron minnich
2018-11-01 16:56 ` Warner Losh
2018-11-02 5:24 ` Bakul Shah
2018-11-04 10:53 ` Chris Hanson
2018-11-04 15:34 ` ron minnich
2018-11-04 17:06 ` Warner Losh
2018-11-04 20:00 ` ron minnich
2018-11-04 18:52 ` Bakul Shah
2018-11-04 10:49 ` Chris Hanson
2018-11-04 12:28 ` arnold
2018-11-04 21:34 ` Chris Hanson
2018-11-05 14:11 ` Donald ODona
2018-11-04 13:35 ` Warner Losh
2018-11-04 19:47 ` Dave Horsfall
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