Signal Handling--ref

The return value and error conditions are the same as forpause.

sigsuspend,you can replace thepauseorsleeploop in the previous section with something completely reliable:

sigset_t mask,oldmask;
...
/ Set up the mask of signals to temporarily block. /

sigemptyset (&mask);

sigaddset (&mask,SIGUSR1);
...
                        
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