11-01-2001
SAM file
I am having a problem on an HP box, where I am being told that there are too many open files. I am also being told I need to change a SAM file. Could some help me understand what a SAM files is and what it is used for.
Thanks.
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On running ‘Disk Devices’ tools under ‘Disks and File Systems’ option of System Administration Manager (SAM) in our UNIX Server (HP 9000 running HPUX B.11.11 U) a warning message appeared. The message that appeared reads as follows
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LEARN ABOUT REDHAT
apr::perlio
PERLIO(1) User Contributed Perl Documentation PERLIO(1)
NAME
APR:PerlIO -- An APR Perl IO layer
SYNOPSIS
use APR::PerlIO ();
sub handler {
my $r = shift;
open my $fh, ">:APR", $filename, $r or die $!;
# work with $fh as normal $fh
close $fh;
return Apache::OK;
}
DESCRIPTION
"APR::PerlIO" implements a Perl IO layer using APR's file manipulation as its internals.
Why do you want to use this? Normally you shouldn't, probably it won't be faster than Perl's default layer. It's only useful when you need
to manipulate a filehandle opened at the APR side, while using Perl.
Normally you won't call open() with APR layer attribute, but some mod_perl functions will return a filehandle which is internally hooked to
APR. But you can use APR Perl IO directly if you want.
METHODS
Perl Interface:
open()
To use APR Perl IO to open a file the four arguments open() should be used. For example:
open my $fh, ">:APR", $filename, $r or die $!;
where:
the second argument is the mode to open the file, constructed from two sections separated by the ":" character: the first section is
the mode to open the file under (>, <, etc) and the second section must be a string APR.
the fourth argument can be a "Apache::RequestRec" or "Apache::ServerRec" object.
the rest of the arguments are the same as described by the open() manpage.
seek()
seek($fh, $offset, $whence);
If $offset is zero, "seek()" works normally.
However if $offset is non-zero and Perl has been compiled with with large files support ("-Duselargefiles"), whereas APR wasn't, this
function will croak. This is because largefile size "Off_t" simply cannot fit into a non-largefile size "apr_off_t".
To solve the problem, rebuild Perl with "-Uuselargefiles". Currently there is no way to force APR to build with large files support.
The C interface provides functions to convert between Perl IO and APR Perl IO filehandles.
SEE ALSO
The perliol(1), perlapio(1) and perl(1) manpages.
perl v5.8.0 2002-06-05 PERLIO(1)