* 64 bit I/O functions (such as stat/ftruncate)
@ 2007-12-06 19:51 John Gateley
2007-12-06 20:15 ` Brian Dessent
2007-12-06 20:29 ` John (Eljay) Love-Jensen
0 siblings, 2 replies; 4+ messages in thread
From: John Gateley @ 2007-12-06 19:51 UTC (permalink / raw)
To: gcc-help
I'm looking for 64 bit I/O functions, such as ftruncate or
stat/fstat/lstat. Some functions exist in 64 bit versions
(such as lseek64), but for others I couldn't find anything.
This is using g++ on linux.
Sorry if this isn't the appropriate venue for this question.
I couldn't find a better one. Please direct me on if it isn't.
j
--
John Gateley <gateley@jriver.com>
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: 64 bit I/O functions (such as stat/ftruncate)
2007-12-06 19:51 64 bit I/O functions (such as stat/ftruncate) John Gateley
@ 2007-12-06 20:15 ` Brian Dessent
2007-12-06 21:32 ` John Gateley
2007-12-06 20:29 ` John (Eljay) Love-Jensen
1 sibling, 1 reply; 4+ messages in thread
From: Brian Dessent @ 2007-12-06 20:15 UTC (permalink / raw)
To: John Gateley; +Cc: gcc-help
John Gateley wrote:
> I'm looking for 64 bit I/O functions, such as ftruncate or
> stat/fstat/lstat. Some functions exist in 64 bit versions
> (such as lseek64), but for others I couldn't find anything.
> This is using g++ on linux.
Normally you don't call the 64 bit versions explicitly, you just add
-D_FILE_OFFSET_BITS=64 to CPPFLAGS and you get the large-file aware
version of all interfaces without the 64 suffix. If you really want to
call them by name then you instead define _LARGEFILE64_SOURCE and you
get the interfaces with the 64 suffix, but that was only added as a
crutch for the transition period where some programs weren't LFS aware.
Those days should hopefully be in the past, so don't uglify your code
unnecessarily.
> Sorry if this isn't the appropriate venue for this question.
> I couldn't find a better one. Please direct me on if it isn't.
These functions are provided by the libc, which is not a part of gcc, so
it's technically off topic here. See the glibc manual for details:
<http://www.gnu.org/software/libc/manual/html_node/Feature-Test-Macros.html>.
Brian
^ permalink raw reply [flat|nested] 4+ messages in thread
* RE: 64 bit I/O functions (such as stat/ftruncate)
2007-12-06 19:51 64 bit I/O functions (such as stat/ftruncate) John Gateley
2007-12-06 20:15 ` Brian Dessent
@ 2007-12-06 20:29 ` John (Eljay) Love-Jensen
1 sibling, 0 replies; 4+ messages in thread
From: John (Eljay) Love-Jensen @ 2007-12-06 20:29 UTC (permalink / raw)
To: John Gateley, gcc-help
Hi John,
Those questions are Linux related, not GCC related.
I'm sure GCC will support the Linux 64-bit I/O API routines without a hitch. But whether or not your particular Linux supports 64-bit I/O API routines and what those APIs are... well, that's Linux issue.
Note: I'd expect the standard routines like lseek to be 64-bit savvy if the OS supports 64-bit file systems, without having special 64-bit one-offs, like lseek64, and things like off_t being typedef'd to a 64-bit integer (probably a signed long long).
--Eljay
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: 64 bit I/O functions (such as stat/ftruncate)
2007-12-06 20:15 ` Brian Dessent
@ 2007-12-06 21:32 ` John Gateley
0 siblings, 0 replies; 4+ messages in thread
From: John Gateley @ 2007-12-06 21:32 UTC (permalink / raw)
To: gcc-help; +Cc: Brian Dessent
On Thu, 06 Dec 2007 12:15:45 -0800
Brian Dessent <brian@dessent.net> wrote:
> John Gateley wrote:
>
> > I'm looking for 64 bit I/O functions, such as ftruncate or
> > stat/fstat/lstat. Some functions exist in 64 bit versions
> > (such as lseek64), but for others I couldn't find anything.
> > This is using g++ on linux.
>
> Normally you don't call the 64 bit versions explicitly, you just add
> -D_FILE_OFFSET_BITS=64 to CPPFLAGS and you get the large-file aware
> version of all interfaces without the 64 suffix.
> ...
Thanks very much...
j
--
John Gateley <gateley@jriver.com>
^ permalink raw reply [flat|nested] 4+ messages in thread
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