ROOT signal handler should ignore SIGPIPE (or ignore it while it is handling it)

When a process using ROOT gets a SIGPIPE, it enters an infinite loop if the SIGPIPE is both on stdout and stderr (e.g. for a redirection).

This one liner (sh) exposes the problem:

python -c 'import ROOT; print "hello"' |& true

The process get stuck trying to handle the SIGPIPE it gets while handling the SIGPIPE...

My suggestion would be to either ignore SIGPIPE or to mask a signal while handling it.