Signal Handling--ref

void
fatal_error_signal (int sig)
{
/ Since this handler is established for more than one kind of signal,it might still get invoked recursively by delivery of some other kind
of signal. Use a static variable to keep track of that. /
if (fatal_error_in_progress)
raise (sig);
fatal_error_in_progress = 1;

/* Now do the clean up actions:

• reset terminal modes
• kill child processes
• remove lock files */
  ...

/ Now reraise the signal. Since the signal is blocked,it will receive its default handling,which is
to terminate the process. We could just call
exit or abort,but reraising the signal
sets the return status from the process correctly. /
raise (sig);
}

setjmpandlongjmpfacilities (see section).

#include 
#include 
jmp_buf return_to_top_level;
volatile sig_atomic_t waiting_for_input;
                        
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