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Edit: patchfdsetsize
#!/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