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1.1 ! root 1: /* Program to produce output at regular intervals. */ ! 2: ! 3: #include <stdio.h> ! 4: #include <time.h> ! 5: ! 6: struct tm *localtime (); ! 7: ! 8: main (argc, argv) ! 9: int argc; ! 10: char **argv; ! 11: { ! 12: int period = 60; ! 13: long when; ! 14: struct tm *tp; ! 15: ! 16: if (argc > 1) ! 17: period = atoi (argv[1]); ! 18: ! 19: while (1) ! 20: { ! 21: /* Make sure wakeup stops when Emacs goes away. */ ! 22: if (getppid () == 1) ! 23: exit (0); ! 24: printf ("Wake up!\n"); ! 25: fflush (stdout); ! 26: /* If using a period of 60, produce the output when the minute ! 27: changes. */ ! 28: if (period == 60) ! 29: { ! 30: time (&when); ! 31: tp = localtime (&when); ! 32: sleep (60 - tp->tm_sec); ! 33: } ! 34: else ! 35: sleep (period); ! 36: } ! 37: }
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