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Programming
Is there a system call other than 'open' for opening very large files?
Post 302344370 by dariyoosh on Sunday 16th of August 2009 08:10:59 AM
08-16-2009
Dear jim mcnamara and achenle
Thank you very much both of you for your help.
I tried with GCC command line option -D_FILE_OFFSET_BITS=64
and it worked.
currently I'm using ubuntu 9.0.4 32-bit
but I think I'm going to switch to Fedora Core 11 (64-bit)
which according to what I read in forums it is better
configured for application development (please correct
me if I'm wrong)
Just one more question about what achenle mentioned.
Is there any specification written particularly for 64 bit?
I mean, If I install a 64bit Linux, will I have linux man pages
specially for 64bit or there will be the same 32bit linux manual
pages when I type man <section> <command>?
Because currently the only official specification that I use
which is also available on the web is the last version of POSIX:
The Open Group Base Specifications Issue 7
It seems that in the case where everything fully conforms to this
specification, the application will be portable (which seems that it is
not the case in my problem, because neither 'fopen64' nor
-D_FILE_OFFSET_BITS=64 is POSIX compliant).
Kind Regards,
Dariyoosh
Thank you very much both of you for your help.
I tried with GCC command line option -D_FILE_OFFSET_BITS=64
and it worked.
currently I'm using ubuntu 9.0.4 32-bit
but I think I'm going to switch to Fedora Core 11 (64-bit)
which according to what I read in forums it is better
configured for application development (please correct
me if I'm wrong)
Just one more question about what achenle mentioned.
Quote:
... Or you can just compile everything as a 64-bit binary
if you're running on a 64-bit OS. If you go that route
it's usually a lot simpler. But you have to actually read specifications ...
if you're running on a 64-bit OS. If you go that route
it's usually a lot simpler. But you have to actually read specifications ...
I mean, If I install a 64bit Linux, will I have linux man pages
specially for 64bit or there will be the same 32bit linux manual
pages when I type man <section> <command>?
Because currently the only official specification that I use
which is also available on the web is the last version of POSIX:
The Open Group Base Specifications Issue 7
It seems that in the case where everything fully conforms to this
specification, the application will be portable (which seems that it is
not the case in my problem, because neither 'fopen64' nor
-D_FILE_OFFSET_BITS=64 is POSIX compliant).
Kind Regards,
Dariyoosh
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LEARN ABOUT CENTOS
isascii
ISASCII(3P) POSIX Programmer's Manual ISASCII(3P) PROLOG
This manual page is part of the POSIX Programmer's Manual. The Linux implementation of this interface may differ (consult the correspond- ing Linux manual page for details of Linux behavior), or the interface may not be implemented on Linux. NAME
isascii - test for a 7-bit US-ASCII character SYNOPSIS
#include <ctype.h> int isascii(int c); DESCRIPTION
The isascii() function shall test whether c is a 7-bit US-ASCII character code. The isascii() function is defined on all integer values. RETURN VALUE
The isascii() function shall return non-zero if c is a 7-bit US-ASCII character code between 0 and octal 0177 inclusive; otherwise, it shall return 0. ERRORS
No errors are defined. The following sections are informative. EXAMPLES
None. APPLICATION USAGE
None. RATIONALE
None. FUTURE DIRECTIONS
None. SEE ALSO
The Base Definitions volume of IEEE Std 1003.1-2001, <ctype.h> COPYRIGHT
Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2003 Edition, Standard for Information Technol- ogy -- Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 6, Copyright (C) 2001-2003 by the Institute of Electrical and Electronics Engineers, Inc and The Open Group. In the event of any discrepancy between this version and the original IEEE and The Open Group Standard, the original IEEE and The Open Group Standard is the referee document. The original Standard can be obtained online at http://www.opengroup.org/unix/online.html . IEEE
/The Open Group 2003 ISASCII(3P)