Signal Handling--ref

while (1)
{
/ Check if a signal has arrived; if so,reset the flag. /
sigprocmask (SIG_BLOCK,&block_alarm,NULL);
if (flag)
{
actions-if-not-arrived
flag = 0;
}
sigprocmask (SIG_UNBLOCK,NULL);

  ...
}

}

SIGTSTP,for instance,then the arrival of that signal forces furtherSIGTSTPsignals to wait during the execution of the handler.

sa_maskmember of thesigactionstructure.

#include 
#include 
void catch_stop ();
void

install_handler (void)

{

struct sigaction setup_action;

sigset_t block_mask;
                        
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