#! perl

# restart server when certain resource limits are exceeded

# TODO, CONF framework?
our $MAX_VMSIZE = $cf::CFG{checkrusage}{vmsize} || 1_000_000_000;

$^O eq "linux" or die "only linux supported right now.\n";

our $STAT_FH;
our $TIMER;

cf::post_init {
   cf::async_ext {
      $STAT_FH = Coro::AIO::aio_open "/proc/self/stat", IO::AIO::O_RDONLY, 0
         or return;

      $TIMER = cf::periodic 10, sub {
         sysseek $STAT_FH, 0, 0;
         sysread $STAT_FH, my $stat, 4096; # only a single line
         my $vmsize = (split / /, $stat)[22];

         cf::cleanup "memory usage growing high ($vmsize > $MAX_VMSIZE), server would run out of memory soon", 0
            if $vmsize >= $MAX_VMSIZE;
      };
   };
};