Toggle to turn on/off checking for descriptor leaks at exit (default: off)
Fraction of maximum number of descriptors considered critical. Default: 0.9
report_open_files ()
prints a dump of open file descriptors to stderr
in two formats, one using the proc file system, the other by executing
/usr/sbin/lsof
in a child process.
report_on_exn exn
calls report_open_files iff exn
indicates a file
descriptor leak (Unix error with code EMFILE or ENFILE).