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#!/usr/bin/perl -w
#
# findrfuncs: find reentrant variants of functions used in an executable.
# Requires a functional "nm -u". Searches headers in /usr/include
# to find available *_r functions and looks for non-reentrant
# variants used in the supplied executable.
#
# Gurusamy Sarathy
# gsar@ActiveState.com
#
# Hacked to automatically find the executable and shared objects.
# --jhi
use strict;
use File::Find;
my @EXES;
my $NMU = 'nm -u';
my @INCDIRS = qw(/usr/include);
my $SO = 'so';
my $EXE = '';
if (open(CONFIG, "config.sh")) {
local $/;
my $CONFIG = <CONFIG>;
$SO = $1 if $CONFIG =~ /^so='(\w+)'/m;
$EXE = $1 if $CONFIG =~ /^_exe='\.(\w+)'/m;
}
push @EXES, "perl$EXE";
find(sub {push @EXES, $File::Find::name if /.$SO$/}, '.' );
push @EXES, @ARGV;
if ($^O eq 'dec_osf') {
$NMU = 'nm -Bu';
}
my %rfuncs;
my @syms;
find(sub {
return unless -f $File::Find::name;
open my $F, "<$File::Find::name"
or die "Can't open $File::Find::name: $!";
my $line;
while (defined ($line = <$F>)) {
if ($line =~ /\b(\w+_r)\b/) {
#warn "$1 => $File::Find::name\n";
$rfuncs{$1} = $File::Find::name;
}
}
close $F;
}, @INCDIRS);
# delete bogus symbols grepped out of comments and such
delete $rfuncs{setlocale_r} if $^O eq 'linux';
for my $exe (@EXES) {
for my $sym (`$NMU $exe`) {
chomp $sym;
$sym =~ s/^\s+[Uu]\s+//;
$sym =~ s/^\s+//;
next if /\s/;
$sym =~ s/\@.*\z//; # remove @@GLIBC_2.0 etc
# warn "#### $sym\n";
if (exists $rfuncs{"${sym}_r"}) {
push @syms, $sym;
}
}
if (@syms) {
print "\nFollowing symbols in $exe have reentrant versions:\n";
for my $sym (@syms) {
print "$sym => $sym" . "_r (in file " . $rfuncs{"${sym}_r"} . ")\n";
}
}
@syms = ();
}
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