Re^5: Why can't I write to a custom log from a Catalyst application on SELinux/CentOS

so yes, autoflush is not default, but you don't need to close after explicitly setting it

#!/usr/bin/perl
use strict;
use warnings;
use feature qw{ say };

unlink "./log.txt" or warn "$!";         # in case


open OUT, '>>', 'log.txt' or die $!;

{
    my $previous_default = select(OUT);  # save previous default
    $|++;                                # autoflush OUT
    select($previous_default);           # restore previous default
}

print OUT "before close";

open IN, '<', 'log.txt' or die $!;

my $read;

$read = <IN>;
chomp $read;
say "Before close: <$read>";

close OUT;
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Before close: <before close>

Cheers Rolf
_{(addicted to the Perl Programming Language :)

Wikisyntax for the Monastery}

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Re^6: Why can't I write to a custom log from a Catalyst application on SELinux/CentOS by LanX (Saint) on Feb 12, 2021 at 01:26 UTC
even easier is using method autoflush directly. Got it from HaukeX' recent post. I should have read the FAQ: https://perldoc.perl.org/perlfaq5#How-do-I-flush/unbuffer-an-output-filehandle?-Why-must-I-do-this? more carefully :) `#!/usr/bin/perl use strict; use warnings; use feature qw{ say }; unlink "./log.txt" or warn "$!"; open OUT, '>>', 'log.txt' or die $!; if (0){ # as you like my $previous_default = select(OUT); # save previous default $\|++; # autoflush OUT select($previous_default); # restore previous default } else { #use PerlIO; # needed for Perl <5.14 OUT->autoflush(); } print OUT "before close"; open IN, '<', 'log.txt' or die $!; my $read; $read = <IN>; chomp $read; say "Before close: <$read>"; close OUT;` [download] `-- mode: compilation; default-directory: "d:/tmp/pm/" -- Compilation started at Fri Feb 12 02:23:56 C:/Perl_524/bin\perl.exe -w d:/tmp/pm/auto_flush.pl Before close: <before close> Compilation finished at Fri Feb 12 02:23:56` [download] Cheers Rolf _{(addicted to the Perl Programming Language :) Wikisyntax for the Monastery}	[reply] [d/l] [select]

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Re^6: Why can't I write to a custom log from a Catalyst application on SELinux/CentOS
by LanX (Saint) on Feb 12, 2021 at 01:26 UTC

Got it from HaukeX' recent post.

I should have read the FAQ: https://perldoc.perl.org/perlfaq5#How-do-I-flush/unbuffer-an-output-filehandle?-Why-must-I-do-this? more carefully :)

#!/usr/bin/perl
use strict;
use warnings;
use feature qw{ say };

unlink "./log.txt" or warn "$!";



open OUT, '>>', 'log.txt' or die $!;



if (0){                                 # as you like
    my $previous_default = select(OUT); # save previous default
    $|++;                               # autoflush OUT
    select($previous_default);          # restore previous default
} else {
    #use PerlIO;                         # needed for Perl <5.14
    OUT->autoflush();
}


print OUT "before close";

open IN, '<', 'log.txt' or die $!;

my $read;

$read = <IN>;
chomp $read;
say "Before close: <$read>";

close OUT;
[download]

-*- mode: compilation; default-directory: "d:/tmp/pm/" -*- Compilation started at Fri Feb 12 02:23:56 C:/Perl_524/bin\perl.exe -w d:/tmp/pm/auto_flush.pl Before close: <before close> Compilation finished at Fri Feb 12 02:23:56
[download]

Cheers Rolf
_{(addicted to the Perl Programming Language :)

Wikisyntax for the Monastery}

[reply]
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[select]