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#!/usr/local/cpanel/3rdparty/bin/perl
# cpanel - scripts/patchfdsetsize Copyright 2022 cPanel, L.L.C.
# All rights reserved.
# copyright@cpanel.net http://cpanel.net
# This code is subject to the cPanel license. Unauthorized copying is prohibited
use strict;
use warnings;
use Cpanel::FileUtils::TouchFile ();
use Getopt::Long;
use Pod::Usage;
my $force = 0;
my $help = 0;
my $default = 0;
GetOptions( 'help' => \$help, 'force' => \$force, 'default' => \$default );
pod2usage(1) if $help;
my @fd_setsize_files = qw(/usr/include/linux/posix_types.h /usr/include/bits/types.h /usr/include/bits/typesizes.h /usr/include/sys/select.h);
my $fd_setsize_skip_file = '/var/cpanel/disable_patchfdsetsize';
if ( -e $fd_setsize_skip_file ) {
if ($force) {
unlink $fd_setsize_skip_file;
}
elsif ($default) {
print qq{FD_SETSIZE has already been reset to default value.\n};
print qq{Use "$0 --default --force" to force reverification.\n};
exit 0;
}
else {
print "FD_SETSIZE will not be changed because ${fd_setsize_skip_file} exists.\n";
print qq{Use "$0 --force" to remove this file and update anyway.\n};
exit 0;
}
}
Cpanel::FileUtils::TouchFile::touchfile($fd_setsize_skip_file) if $default;
my $target_fd_setsize = $default ? 1024 : 16384;
my $bad_fd_setsize = $default ? 16384 : 1024;
foreach my $header_file (@fd_setsize_files) {
next unless ( -e $header_file );
if ( open my $header_fh, '<', $header_file ) {
my @contents = ();
my $has_bad_fdsetsize = 0;
while ( my $line = readline($header_fh) ) {
if ( $line =~ s/(\s*\#define\s+_*FD_SETSIZE\s+)${bad_fd_setsize}/$1${target_fd_setsize}/ ) {
$has_bad_fdsetsize = 1;
}
push @contents, $line;
}
close $header_fh;
next unless $has_bad_fdsetsize;
if ( open $header_fh, '>', $header_file ) {
print $header_fh @contents;
close $header_fh;
print "Updated FD_SETSIZE in $header_file to $target_fd_setsize\n";
}
else {
print "Couldn't open $header_file for writing: $!\n";
}
}
else {
print "Couldn't open $header_file for reading: $!\n";
}
}
exit 0;
__END__
=head1 NAME
patchfdsetsize - Update FD_SETSIZE definitions in system header files to 16384
=head1 SYNOPSIS
patchfdsetsize [options]
Options:
--help Brief help message
--force Rerun configuration routines when /var/cpanel/disable_patchfdsetsize exists
--default Switch back to default FD_SETSIZE value of 1024
=cut