* utimes/futimes/lutimes syscalls
@ 2003-07-12 5:22 Ulrich Drepper
2003-07-12 5:37 ` Ulrich Drepper
2003-07-12 5:42 ` Andrew Morton
0 siblings, 2 replies; 8+ messages in thread
From: Ulrich Drepper @ 2003-07-12 5:22 UTC (permalink / raw)
To: Linus Torvalds, Andrew Morton; +Cc: Linux Kernel
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With the introduction of the nanosecond fields in struct stat the
utime() syscall is kind of obsolete. It's not possible anymore to
restore the exact access/modification time of a file.
Unix defines the utimes() function for this. It is currently
implementated in glibc on top of the utime() syscall which used to be OK
but isn't anymore today. In addition some systems provide the futimes()
and lutimes() functions which appropriate semantics.
The question: would a patch introducing these syscalls be accepted? If
there are filesystems which store the sub-seconds on disk I think this
is necessary since otherwise all kinds of programs (including archives)
cannot be written correctly. If the sub-seconds only live in memory I
still think it would be good to have the syscalls but it would not be
that urgent.
- --
- --------------. ,-. 444 Castro Street
Ulrich Drepper \ ,-----------------' \ Mountain View, CA 94041 USA
Red Hat `--' drepper at redhat.com `---------------------------
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^ permalink raw reply [flat|nested] 8+ messages in thread
* Re: utimes/futimes/lutimes syscalls
2003-07-12 5:22 utimes/futimes/lutimes syscalls Ulrich Drepper
@ 2003-07-12 5:37 ` Ulrich Drepper
2003-07-12 5:57 ` David Mosberger
2003-07-12 5:42 ` Andrew Morton
1 sibling, 1 reply; 8+ messages in thread
From: Ulrich Drepper @ 2003-07-12 5:37 UTC (permalink / raw)
To: Linus Torvalds, Andrew Morton; +Cc: Linux Kernel
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Ulrich Drepper wrote:
> With the introduction of the nanosecond fields in struct stat the
> utime() syscall is kind of obsolete. It's not possible anymore to
> restore the exact access/modification time of a file.
Replying to myself: utimes() is already available, on some
architectures. The question is why not for archs != alpha, ia64, PA, SPARC?
And of course the question of futimes/lutimes remains.
- --
- --------------. ,-. 444 Castro Street
Ulrich Drepper \ ,-----------------' \ Mountain View, CA 94041 USA
Red Hat `--' drepper at redhat.com `---------------------------
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^ permalink raw reply [flat|nested] 8+ messages in thread
* Re: utimes/futimes/lutimes syscalls
2003-07-12 5:37 ` Ulrich Drepper
@ 2003-07-12 5:57 ` David Mosberger
2003-07-12 6:38 ` Ulrich Drepper
0 siblings, 1 reply; 8+ messages in thread
From: David Mosberger @ 2003-07-12 5:57 UTC (permalink / raw)
To: Ulrich Drepper; +Cc: Linus Torvalds, Andrew Morton, Linux Kernel
>>>>> On Fri, 11 Jul 2003 22:37:30 -0700, Ulrich Drepper <drepper@redhat.com> said:
Uli> Replying to myself: utimes() is already available, on some
Uli> architectures. The question is why not for archs != alpha,
Uli> ia64, PA, SPARC?
Do you have this backwards? ia64 has utimes(), but not utime(). The
same should be true for Alpha.
--david
^ permalink raw reply [flat|nested] 8+ messages in thread
* Re: utimes/futimes/lutimes syscalls
2003-07-12 5:57 ` David Mosberger
@ 2003-07-12 6:38 ` Ulrich Drepper
0 siblings, 0 replies; 8+ messages in thread
From: Ulrich Drepper @ 2003-07-12 6:38 UTC (permalink / raw)
To: davidm; +Cc: Linus Torvalds, Andrew Morton, Linux Kernel
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David Mosberger wrote:
> Do you have this backwards? ia64 has utimes(), but not utime(). The
> same should be true for Alpha.
Yes, it was meant to say "why not for archs *other than* ...".
I attach the x86 version of the change.
- --
- --------------. ,-. 444 Castro Street
Ulrich Drepper \ ,-----------------' \ Mountain View, CA 94041 USA
Red Hat `--' drepper at redhat.com `---------------------------
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[-- Attachment #2: d-kernel-utimes --]
[-- Type: text/plain, Size: 799 bytes --]
--- linux-2.5/arch/i386/kernel/entry.S-old 2003-07-07 15:56:22.000000000 -0700
+++ linux-2.5/arch/i386/kernel/entry.S 2003-07-11 22:46:02.000000000 -0700
@@ -876,6 +876,7 @@ ENTRY(sys_call_table)
.long sys_clock_nanosleep
.long sys_statfs64
.long sys_fstatfs64
- .long sys_tgkill
+ .long sys_tgkill /* 270 */
+ .long sys_utimes
nr_syscalls=(.-sys_call_table)/4
--- linux-2.5/include/asm-i386/unistd.h-old 2003-07-07 15:56:22.000000000 -0700
+++ linux-2.5/include/asm-i386/unistd.h 2003-07-11 22:45:21.000000000 -0700
@@ -276,8 +276,9 @@
#define __NR_statfs64 268
#define __NR_fstatfs64 269
#define __NR_tgkill 270
+#define __NR_utimes 271
-#define NR_syscalls 271
+#define NR_syscalls 272
/* user-visible error numbers are in the range -1 - -124: see <asm-i386/errno.h> */
^ permalink raw reply [flat|nested] 8+ messages in thread
* Re: utimes/futimes/lutimes syscalls
2003-07-12 5:22 utimes/futimes/lutimes syscalls Ulrich Drepper
2003-07-12 5:37 ` Ulrich Drepper
@ 2003-07-12 5:42 ` Andrew Morton
2003-07-14 7:45 ` Nikita Danilov
1 sibling, 1 reply; 8+ messages in thread
From: Andrew Morton @ 2003-07-12 5:42 UTC (permalink / raw)
To: Ulrich Drepper; +Cc: torvalds, linux-kernel
Ulrich Drepper <drepper@redhat.com> wrote:
>
> If
> there are filesystems which store the sub-seconds on disk I think this
> is necessary since otherwise all kinds of programs (including archives)
> cannot be written correctly. If the sub-seconds only live in memory I
> still think it would be good to have the syscalls but it would not be
> that urgent.
XFS (at least) stores nanoseconds on disk. So yes, I think we should make
this change.
^ permalink raw reply [flat|nested] 8+ messages in thread
* Re: utimes/futimes/lutimes syscalls
2003-07-12 5:42 ` Andrew Morton
@ 2003-07-14 7:45 ` Nikita Danilov
2003-07-14 12:16 ` Tomas Szepe
0 siblings, 1 reply; 8+ messages in thread
From: Nikita Danilov @ 2003-07-14 7:45 UTC (permalink / raw)
To: Ulrich Drepper; +Cc: Andrew Morton, torvalds, linux-kernel
Andrew Morton writes:
> Ulrich Drepper <drepper@redhat.com> wrote:
> >
> > If
> > there are filesystems which store the sub-seconds on disk I think this
> > is necessary since otherwise all kinds of programs (including archives)
> > cannot be written correctly. If the sub-seconds only live in memory I
> > still think it would be good to have the syscalls but it would not be
> > that urgent.
>
> XFS (at least) stores nanoseconds on disk. So yes, I think we should make
> this change.
so does reiser4.
> -
Nikita.
^ permalink raw reply [flat|nested] 8+ messages in thread
end of thread, other threads:[~2003-07-15 18:17 UTC | newest]
Thread overview: 8+ messages (download: mbox.gz / follow: Atom feed)
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2003-07-12 5:22 utimes/futimes/lutimes syscalls Ulrich Drepper
2003-07-12 5:37 ` Ulrich Drepper
2003-07-12 5:57 ` David Mosberger
2003-07-12 6:38 ` Ulrich Drepper
2003-07-12 5:42 ` Andrew Morton
2003-07-14 7:45 ` Nikita Danilov
2003-07-14 12:16 ` Tomas Szepe
2003-07-15 18:31 ` Nikita Danilov
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