gri3-wm/testcases/lib/StartXDummy.pm

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Perl
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package StartXDummy;
# vim:ts=4:sw=4:expandtab
use strict;
use warnings;
use Exporter 'import';
use Time::HiRes qw(sleep);
use v5.10;
our @EXPORT = qw(start_xdummy);
my @pids;
my $x_socketpath = '/tmp/.X11-unix/X';
# reads in a whole file
sub slurp {
open(my $fh, '<', shift) or return '';
local $/;
<$fh>;
}
# forks an Xdummy or Xdmx process
sub fork_xserver {
my $keep_xdummy_output = shift;
my $displaynum = shift;
my $pid = fork();
die "Could not fork: $!" unless defined($pid);
if ($pid == 0) {
# Child, close stdout/stderr, then start Xdummy.
if (!$keep_xdummy_output) {
close STDOUT;
close STDERR;
}
exec @_;
exit 1;
}
push(@complete_run::CLEANUP, sub {
kill(15, $pid);
# Unlink the X11 socket, Xdmx seems to leave it there.
unlink($x_socketpath . $displaynum);
});
push @pids, $pid;
return $x_socketpath . $displaynum;
}
# Blocks until the socket paths specified in the given array reference actually
# exist.
sub wait_for_x {
my ($sockets_waiting) = @_;
# Wait until Xdmx actually runs. Pretty ugly solution, but as long as we
# cant socket-activate X11…
while (1) {
@$sockets_waiting = grep { ! -S $_ } @$sockets_waiting;
last unless @$sockets_waiting;
sleep 0.1;
}
}
=head2 start_xdummy($parallel)
Starts C<$parallel> (or number of cores * 2 if undef) Xdummy processes (see
the file ./Xdummy) and returns two arrayrefs: a list of X11 display numbers to
the Xdummy processes and a list of PIDs of the processes.
=cut
sub start_xdummy {
my ($parallel, $numtests, $keep_xdummy_output) = @_;
my @displays = ();
my @childpids = ();
$SIG{CHLD} = sub {
my $child = waitpid -1, POSIX::WNOHANG;
@pids = grep { $_ != $child } @pids;
return unless @pids == 0;
print STDERR "All Xdummy processes died.\n";
print STDERR "Use ./complete-run.pl --parallel 1 --keep-xdummy-output\n";
print STDERR "";
print STDERR "A frequent cause for this is missing the DUMMY Xorg module,\n";
print STDERR "package xserver-xorg-video-dummy on Debian.\n";
exit 1;
};
# Yeah, I know its non-standard, but Perls POSIX module doesnt have
# _SC_NPROCESSORS_CONF.
my $cpuinfo = slurp('/proc/cpuinfo');
my $num_cores = scalar grep { /model name/ } split("\n", $cpuinfo);
# If /proc/cpuinfo does not exist, we fall back to 2 cores.
$num_cores ||= 2;
# If unset, we use num_cores * 2.
$parallel ||= ($num_cores * 2);
# If we are running a small number of tests, dont over-parallelize.
$parallel = $numtests if $numtests < $parallel;
# First get the last used display number, then increment it by one.
# Effectively falls back to 1 if no X server is running.
my ($displaynum) = map { /(\d+)$/ } reverse sort glob($x_socketpath . '*');
$displaynum++;
say "Starting $parallel Xdummy instances, starting at :$displaynum...";
my @sockets_waiting;
for (1 .. $parallel) {
# We use -config /dev/null to prevent Xdummy from using the system
# Xorg configuration. The tests should be independant from the
# actual system X configuration.
my $socket = fork_xserver($keep_xdummy_output, $displaynum,
'./Xdummy', ":$displaynum", '-config', '/dev/null',
'-nolisten', 'tcp');
push(@displays, ":$displaynum");
push(@sockets_waiting, $socket);
$displaynum++;
}
wait_for_x(\@sockets_waiting);
return @displays;
}
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