From: "Clément Pit-Claudel" <cpitclaudel@gmail.com>
To: emacs-devel@gnu.org
Subject: Re: Rename, delete and move current buffer and file
Date: Fri, 11 May 2018 12:06:17 -0400 [thread overview]
Message-ID: <e639bc25-1ae6-0a6b-00d1-4bd2a32c0e0e@gmail.com> (raw)
In-Reply-To: <069aa767-6d25-c281-6edd-bd45a522ae30@cs.ucla.edu>
On 2018-05-11 11:45, Paul Eggert wrote:
> On 05/11/2018 08:33 AM, Stefan Monnier wrote:
>>> That method has been obsolete for decades. POSIX requires rename
>>> to be atomic.
>> Even when moving from one directory to another?
>
> Yes, that requirement has been in POSIX ever since POSIX was
> introduced; I just now checked my printed copy of IEEE Std
> 1003.1-1988.
I don't know much about this, so sorry if the following is silly. Hopefully someone can clarify. The glibc implementation of rename in glibc/sysdeps/posix/rename.c is this:
/* Rename the file OLD to NEW. */
int
rename (const char *old, const char *new)
{
int save = errno;
if (__link (old, new) < 0)
{
if (errno == EEXIST)
{
__set_errno (save);
/* Race condition, required for 1003.1 conformance. */
if (__unlink (new) < 0 ||
__link (old, new) < 0)
return -1;
}
else
return -1;
}
if (__unlink (old) < 0)
{
save = errno;
if (__unlink (new) == 0)
__set_errno (save);
return -1;
}
return 0;
}
Is this just a fallback implementation (the "obsolete for decades" method that Andreas referred to?), unused on most platforms?
Thanks!
Clément.
next prev parent reply other threads:[~2018-05-11 16:06 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-05-07 13:58 Rename, delete and move current buffer and file Jarosław Rzeszótko
2018-05-07 14:53 ` Stefan Monnier
2018-05-07 16:20 ` Jarosław Rzeszótko
2018-05-07 17:01 ` Stefan Monnier
2018-05-07 17:47 ` Jarosław Rzeszótko
2018-05-08 1:28 ` Stefan Monnier
2018-05-08 7:05 ` Jarosław Rzeszótko
2018-05-09 12:28 ` Stefan Monnier
2018-05-09 18:12 ` Radon Rosborough
2018-05-09 22:44 ` Stefan Monnier
2018-05-10 17:01 ` Radon Rosborough
2018-05-10 21:49 ` Stefan Monnier
2018-05-11 7:31 ` Andreas Schwab
2018-05-11 15:33 ` Stefan Monnier
2018-05-11 15:45 ` Paul Eggert
2018-05-11 16:06 ` Clément Pit-Claudel [this message]
2018-05-11 16:14 ` Stefan Monnier
2018-05-09 23:50 ` Van L
2018-05-10 5:37 ` Jarosław Rzeszótko
2018-05-10 13:18 ` Van L
2018-05-10 8:20 ` Amit Ramon
2018-05-10 8:59 ` Phil Sainty
2018-05-10 16:04 ` Eli Zaretskii
2018-05-07 18:20 ` Andreas Schwab
2018-05-08 1:28 ` Stefan Monnier
2018-05-07 15:28 ` Yuri Khan
2018-05-07 16:20 ` Jarosław Rzeszótko
2018-05-09 11:46 ` Tino Calancha
2018-05-07 15:29 ` Andreas Röhler
2018-05-07 15:38 ` Andreas Röhler
2018-05-10 0:46 ` net june
2018-05-11 6:26 ` Andreas Röhler
2018-05-11 16:10 ` net june
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