Two of the "domain error" cases described on this page are treated in
the same way on Linux, but POSIX.1 specifies some optional differences
for the two cases. Make life easier for future page reviewers/editors
by adding some comments explaining that POSIX.1-2001 distinguishes
the two cases.
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
Reported-by: Nicolas Franois <nicolas.francois@centraliens.net>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
In recent changes to the man page, mtk accidentally cganged
the description of the return value range to -pi/2..pi/2;
the corect range is -pi..pi.
Make it clear that the POSIX.1 revision that is likely
to affect the feature test macro requirements for futimens() is
POSIX.1-2008.
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
Reported-by: Nicolas Franois <nicolas.francois@centraliens.net>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
The times argument point to *an array of* structures, and the
man-page should say that consistently.
(The '&' before sop in the semop() call is unneeded.)
Signed-off-by: Kirill A. Shutemov <kirill@shutemov.name>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
Describe use of tm_isdst for input to mktime();
explain how mktime() modifies this field.
(This field is left unchanged in case of error.)
Reported-by: Eugene V. Lyubimkin <jackyf.devel@gmail.com>
Debian bug 500178
Summary from mtk: recent work on mlock caused Maxin to notice that
the EAGAIN error was not documented. KOSAKI Motohiro noted
that this behavior is longstanding.
=====
Dear Michael,
As per the mlock(2) implementation bugfix which is present in
Linux 2.6.27-rc2 git commit,
(http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=a477097d9c37c1cf289c7f0257dffcfa42d50197),
the mlock(2) man page should be modified to reflect the latest changes
in the kernel.
See the LKML thread regarding this commit :
http://www.nabble.com/mlock()-return-value-issue-in-kernel-2.6.23.17-td18751601.html
This patch modifies the mlock(2) behaviour as per the SUSv3 specification.
[ENOMEM]
Some or all of the address range specified by the addr and
len arguments does not correspond to valid mapped pages
in the address space of the process.
[EAGAIN]
Some or all of the memory identified by the operation could not
be locked when the call was made.
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
Signed-off-by: Maxin B. John <maxin.john@ap.sony.com>
=====
From: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
To: "Maxin John" <maxin.john@gmail.com>
Subject: Re: mlock(2) man page modifications
Cc: kosaki.motohiro@jp.fujitsu.com,
"Michael Kerrisk" <mtk.manpages@googlemail.com>, man@vger.kernel.org
Date: Thu, 25 Sep 2008 15:04:49 +0900 (JST)
Hi Maxin,
Thank you for your attention.
I think your point and your patch are right.
However, my patch is trivial regression fix, not behavior change.
An older kernel can return EAGAIN at memory stavation.
my patch has following hunk.
> +++ b/mm/mlock.c
> @@ -78,8 +78,6 @@ success:
>
> mm->locked_vm -= pages;
> out:
> - if (ret == -ENOMEM)
> - ret = -EAGAIN;
In addition, 2.6.11 (oldest code of git repository) has following code.
static int mlock_fixup(struct vm_area_struct * vma,
unsigned long start, unsigned long end, unsigned int newflags)
{
(snip)
vma->vm_mm->locked_vm -= pages;
out:
if (ret == -ENOMEM)
ret = -EAGAIN;
return ret;
}
that behavior is linux mlock's behavior for long long time.
Thanks!
When we use 'strncpy(buf, str, n)', strncpy() will fill chars from 0..(n - 1).
As we force the character at position 'n - 1' to be '\0' anyway, don't fill
it in strncpy() before.
Signed-off-by: André Goddard Rosa <andre.goddard@gmail.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
Michael Kerrisk