From: Oleg Nesterov
Sent: 06 June 2019 12:05 On 06/06, David Laight wrote:
If a signal handler is called, I presume that the trampoline calls back into the kernel to get further handlers called and to finally restore the original signal mask?
See sigmask_to_save(), this is what the kernel records in uc.uc_sigmask before the signal handler runs, after that current->saved_sigmask has no meaning.
Some of this code is hard to grep through :-)
When signal handler returns it does sys_rt_sigreturn() which restores the original mask saved in uc_sigmask.
Does that mean that if 2 signals interrupt epoll_wait() only one of the signal handlers is run?
David
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