Limit user programs to one process

diff --git a/gruntmaster-exec b/gruntmaster-exec
index e7d7363d4c44308c0622a32e4ecbb7565682c88c..319671e2aa8153e5aa88bca254618616ed2bf491 100755 (executable)
--- a/gruntmaster-exec
+++ b/gruntmaster-exec
@@ -22,7 +22,7 @@ use constant +{
 use constant USER => 65534;
 use constant GROUP => 65534;
 
-use BSD::Resource qw/setrlimit RLIMIT_AS RLIMIT_FSIZE/;
+use BSD::Resource qw/setrlimit RLIMIT_AS RLIMIT_FSIZE RLIMIT_NPROC/;
 use IPC::Signal qw/sig_name sig_num/;
 use sigtrap qw/XFSZ/;
 
@@ -73,6 +73,7 @@ if ($ret) {
        %ENV = (ONLINE_JUDGE => 1, PATH => $ENV{PATH}, HOME => $ENV{HOME});
        setrlimit RLIMIT_AS, $mlimit, $mlimit or die $! if $mlimit;
        setrlimit RLIMIT_FSIZE, $olimit, $olimit or die $! if $olimit;
+       setrlimit RLIMIT_NPROC, 1, 1 or die $! if $nobody;
        POSIX::setgid $nobody ? 65534 : USER;
        POSIX::setuid $nobody ? 65534 : GROUP;
        exec @ARGV;