On Wed, Mar 19, 2014 at 06:29:01PM +0100, Michal Privoznik wrote:
Currently, we use pthread_sigmask(SIG_BLOCK, ...) prior to calling poll(). This is okay, as we don't want poll() to be interrupted. However, then - immediately as we fall out from the poll() - we try to restore the original sigmask - again using SIG_BLOCK. But as the man page says, SIG_BLOCK adds signals to the signal mask:
SIG_BLOCK The set of blocked signals is the union of the current set and the set argument.
Therefore, when restoring the original mask, we need to completely overwrite the one we set earlier and hence we should be using:
SIG_SETMASK The set of blocked signals is set to the argument set.
And indeed we do that on all other places.
Signed-off-by: Michal Privoznik <mprivozn@redhat.com> ---
ACK.
Notes: This is a very old bug. It's worth backporting onto all maint branches we have.
Go ahead (but only the active ones ;-) ) Martin