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|
#!/usr/bin/perl
# Perl script to ease the use of gdb with valgrind.
#
# Invoke as: vdb.pl <command to run>
use strict;
use warnings;
use IPC::Open3;
use IO::Select;
# Global variables
my $gdbkilled = 0;
sub killgdb() {
if ($gdbkilled) {
return;
}
print GDBSTDIN " \nkill\ny\nquit\n";
$gdbkilled = 1;
}
# Store the args
my @args = @ARGV;
# Make the invocation args for valgrind
my @vgargs = (
"valgrind",
"--track-origins=yes",
"--vgdb=yes",
"--vgdb-error=0" );
push(@vgargs, @args);
# Make the invocation args for gdb
my @gdbargs = (
"gdb",
$args[0]);
# Fork the subprocesses
my $vgpid = open3(0, \*VGSTDOUT, 0, @vgargs);
my $gdbpid = open3(\*GDBSTDIN, \*GDBSTDOUT, 0, @gdbargs);
# Cope with Ctrl-C
sub my_sigint_handler() {
print "Caught a SIGINT...\n";
if ($gdbkilled) {
kill 9, $vgpid;
kill 9, $gdbpid;
exit(1);
}
killgdb();
}
$SIG{'INT'} = \&my_sigint_handler;
my $sel = new IO::Select();
$sel->add(*VGSTDOUT);
$sel->add(*GDBSTDOUT);
$sel->add(*STDIN);
*STDOUT->autoflush();
my $scanning = 1;
sub print_lines($)
{
my $buf=shift;
while (1) {
my $loc = index($buf, "\n");
if ($loc < 0) {
last;
}
my $line = substr($buf, 0, $loc+1);
print "$line";
$buf = substr($buf, $loc+1);
}
return $buf;
}
my $vgpartial = '';
my $gdbpartial = '';
my $last2print = 0; # 0 = VG, 1 = GDB
while (my @ready = $sel->can_read())
{
for my $fh (@ready) {
# If valgrind says anything, just print it.
if ($fh eq *VGSTDOUT) {
my $vgbuf= '';
if (sysread(VGSTDOUT, $vgbuf, 64*1024, length($vgbuf)) == 0) {
# When valgrind hits EOF, exit.
killgdb();
waitpid($vgpid,0);
waitpid($gdbpid,0);
exit(0);
}
if ($scanning) {
$vgbuf =~ m/(target remote \| .+ \-\-pid\=\d+)\s*/;
if ($1) {
print GDBSTDIN "$1\n";
$scanning = 0;
}
}
# It definitely read something, so print it.
if ($last2print == 1) { # Last to print was GDB
if ($gdbpartial ne "") { # We need a newline
print "\n";
}
# Better reprint any partial line we had
print "$vgpartial";
}
$vgpartial = print_lines($vgbuf);
print "$vgpartial";
$last2print = 0; # VG
}
# Don't say anything to or from gdb until after we've got the magic words from valgrind
if ($scanning == 0) {
# Anything the user says, should be parotted to gdb
if ($fh eq *STDIN) {
my $buf = '';
if (sysread(STDIN, $buf, 64*1024, length($buf)) == 0) {
# When the user hits EOF, start to kill stuff.
killgdb();
}
print GDBSTDIN "$buf";
}
# Anything gdb says, should be parotted out.
if ($fh eq *GDBSTDOUT) {
my $gdbbuf='';
if (sysread(GDBSTDOUT, $gdbbuf, 64*1024, length($gdbbuf)) == 0) {
# When gdb hits EOF start to kill stuff.
killgdb();
}
# It definite read something, so print it.
if ($last2print == 0) { # Last to print was VG
if ($vgpartial ne "") { # We need a newline
print "\n";
}
# Better reprint any partial line we had
print "$gdbpartial";
}
$gdbpartial = print_lines($gdbbuf);
print "$gdbpartial";
$last2print = 1; # GDB
}
}
}
}
|
