I tried your script and used every combination I found mentioned in perlipc (i.e. without posix) and couldn't get it to work either. It seems definitely broken.

A trace shows this difference between a successful handling and an unsuccessful:

#ok:
write(1, "got signal.\n", 12got signal.
)           = 12
wait4(-1, 0x7fff97d3635c, WNOHANG, NULL) = -1 ECHILD (No child process
+es)
rt_sigprocmask(SIG_BLOCK, [USR1], [USR1], 8) = 0
rt_sigaction(SIGUSR1, {0x4ba320, [], SA_RESTORER, 0x7ff73ec382e0}, {0x
+4ba320, [], SA_RESTORER, 0x7ff73ec382e0}, 8) = 0
rt_sigprocmask(SIG_SETMASK, [USR1], NULL, 8) = 0
rt_sigprocmask(SIG_UNBLOCK, [USR1], NULL, 8) = 0
rt_sigprocmask(SIG_BLOCK, [CHLD], [], 8) = 0

#not ok:
write(1, "got signal.\n", 12got signal.
)           = 12
wait4(-1, 0x7fff97d3635c, WNOHANG, NULL) = -1 ECHILD (No child process
+es)
rt_sigprocmask(SIG_BLOCK, [USR1], [USR1], 8) = 0
rt_sigaction(SIGUSR1, {0x4ba320, [], SA_RESTORER, 0x7ff73ec382e0}, {0x
+4ba320, [], SA_RESTORER, 0x7ff73ec382e0}, 8) = 0
rt_sigprocmask(SIG_SETMASK, [USR1], NULL, 8) = 0
rt_sigprocmask(SIG_UNBLOCK, [USR1], NULL, 8) = 0
rt_sigaction(SIG_0, NULL, {0x8ab3b8, [], SA_NOCLDSTOP}, 8) = -1 EINVAL
+ (Invalid argument)

[download]

The difference is the call to rt_sigaction instead of a third rt_sigprocmask, seemingly unprovoked by any return values from the operating system. So my guess is the problem is in the perl code. It seems a case for a debugger now

In reply to Re: How to prevent Perl from exit when SIGUSR1 recieved? by jethro
in thread How to prevent Perl from exit when SIGUSR1 recieved? by cmyker

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