Avoid an infinite loop (mga#35061)HEADmaster

When `waitpid` returns `-1` (which corresponds to `ECHILD` - no child process), here's what happens in the loop:
1. `$child_pid = waitpid(-1, POSIX::WNOHANG)` assigns `-1` to `$child_pid`
2. The condition `undef $pid if $pid == $child_pid` is evaluated, but it probably does nothing (unless `$pid` was already `-1`)
3. The condition `until $child_pid > 0` is tested: `-1 > 0` is **false**
**This is an infinite loop!**
until $child_pid <= 0;  # stop when there are no more children to reap

0 files changed, 0 insertions, 0 deletions