120 lines
3.2 KiB
Perl
120 lines
3.2 KiB
Perl
package StartXServer;
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# vim:ts=4:sw=4:expandtab
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use strict;
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use warnings;
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use Exporter 'import';
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use Time::HiRes qw(sleep);
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use i3test::Util qw(slurp);
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use v5.10;
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our @EXPORT = qw(start_xserver);
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my @pids;
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my $x_socketpath = '/tmp/.X11-unix/X';
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# forks an X server process
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sub fork_xserver {
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my $keep_xserver_output = shift;
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my $displaynum = shift;
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my $pid = fork();
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die "Could not fork: $!" unless defined($pid);
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if ($pid == 0) {
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# Child, close stdout/stderr, then start Xephyr
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if (!$keep_xserver_output) {
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close STDOUT;
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close STDERR;
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}
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exec @_;
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exit 1;
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}
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push(@complete_run::CLEANUP, sub {
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kill(15, $pid);
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# Unlink the X11 socket, Xdmx seems to leave it there.
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unlink($x_socketpath . $displaynum);
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});
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push @pids, $pid;
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return $x_socketpath . $displaynum;
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}
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# Blocks until the socket paths specified in the given array reference actually
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# exist.
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sub wait_for_x {
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my ($sockets_waiting) = @_;
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# Wait until Xdmx actually runs. Pretty ugly solution, but as long as we
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# can’t socket-activate X11…
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while (1) {
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@$sockets_waiting = grep { ! -S $_ } @$sockets_waiting;
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last unless @$sockets_waiting;
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sleep 0.1;
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}
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}
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=head2 start_xserver($parallel)
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Starts C<$parallel> (or number of cores * 2 if undef) Xephyr processes (see
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https://www.freedesktop.org/wiki/Software/Xephyr/) and returns two arrayrefs: a
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list of X11 display numbers to the Xephyr processes and a list of PIDs of the
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processes.
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=cut
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sub start_xserver {
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my ($parallel, $numtests, $keep_xserver_output) = @_;
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my @displays = ();
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my @childpids = ();
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# Yeah, I know it’s non-standard, but Perl’s POSIX module doesn’t have
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# _SC_NPROCESSORS_CONF.
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my $num_cores;
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if (-e '/proc/cpuinfo') {
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my $cpuinfo = slurp('/proc/cpuinfo');
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$num_cores = scalar grep { /model name/ } split("\n", $cpuinfo);
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}
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# If /proc/cpuinfo does not exist, we fall back to 2 cores.
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$num_cores ||= 2;
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# If unset, we use num_cores * 2.
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$parallel ||= ($num_cores * 2);
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# If we are running a small number of tests, don’t over-parallelize.
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$parallel = $numtests if $numtests < $parallel;
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# First get the last used display number, then increment it by one.
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# Effectively falls back to 1 if no X server is running.
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my ($displaynum) = map { /(\d+)$/ } reverse sort glob($x_socketpath . '*');
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$displaynum++;
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say "Starting $parallel Xephyr instances, starting at :$displaynum...";
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$SIG{CHLD} = sub {
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my $child = waitpid -1, POSIX::WNOHANG;
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@pids = grep { $_ != $child } @pids;
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return unless @pids == 0;
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print STDERR "All X server processes died.\n";
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print STDERR "Use ./complete-run.pl --parallel 1 --keep-xserver-output\n";
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exit 1;
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};
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my @sockets_waiting;
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for (1 .. $parallel) {
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my $socket = fork_xserver($keep_xserver_output, $displaynum,
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'Xephyr', ":$displaynum", '-screen', '1280x800',
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'-nolisten', 'tcp');
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push(@displays, ":$displaynum");
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push(@sockets_waiting, $socket);
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$displaynum++;
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}
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wait_for_x(\@sockets_waiting);
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return @displays;
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}
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1
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