On Thu, May 14, 2020 at 07:21:35PM +0000, Kamil Rytarowski wrote: > Module Name: src > Committed By: kamil > Date: Thu May 14 19:21:35 UTC 2020 > > Modified Files: > src/tests/lib/libc/sys: t_ptrace_fork_wait.h > > Log Message: > Ignore interception of the SIGCHLD signals. > > SIGCHLD once blocked is discarded by the kernel as it has the > SA_IGNORE property. During the fork(2) operation all signals can be > shortly blocked and missed (unless there is a registered signal > handler in the traced child). This leads to a race in this test if > there would be an intention to catch SIGCHLD.
This doesn't sound right. sigprocmask and pthread_sigmask shouldn't affect whether the signal handler is called, only when. Temporarily masking a signal is different from setting it to SIG_IGN. Joerg
