SIGALRM can't be delivered after longjmp from handler?

[Sriranga Veeraraghavan]

For other signals like SEGV and BUS and INTR, I had to re-enable the
signal by calling signal() after longjmp as specified in the signal(2)
manpage for Linux:

"Unlike on BSD systems, signals under Linux are reset to their default
behavior when raised.  However, if you include <bsd/signal.h> instead
of <signal.h> then signal is redefined as __bsd_signal and signal has
the BSD semantics.  Both versions of signal are library routines built
on top of sigaction(2)."

I changed your example program to restore the signal handler routine
once the signal is raised and it worked as you described. I did not
try using <bsd/signal.h>. You may wish to try that. I prefer just
restoring the signal handler, since this avoid #ifdefs for different
platorms.

----ranga <ranga at soda.berkeley.edu>

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