Signal Handling--ref

Remember,too,that blocking program error signals such asSIGFPEleads to undesirable results for signals generated by an actual program error (as opposed to signals sent withraiseorkill). This is because your program may be too broken to be able to continue executing to a point where the signal is unblocked again. See section.

SIGALRMsignals that sets a flag whenever a signal arrives,and your main program checks this flag from time to time and then resets it. You can prevent additionalSIGALRMsignals from arriving in the meantime by wrapping the critical part of the code with calls tosigprocmask,like this:

/* This variable is set by the SIGALRM signal handler. */
volatile sig_atomic_t flag = 0;
int

main (void)

{

sigset_t block_alarm;
...
/ Initialize the signal mask. /

sigemptyset (&block_alarm);

sigaddset (&block_alarm,SIGALRM);
                        
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