| 1 | /* |
| 2 | * Copyright (c) 1980 Regents of the University of California. |
| 3 | * All rights reserved. The Berkeley software License Agreement |
| 4 | * specifies the terms and conditions for redistribution. |
| 5 | * |
| 6 | * @(#)alarm_.c 5.1 %G% |
| 7 | */ |
| 8 | |
| 9 | /* |
| 10 | * set an alarm time, arrange for user specified action, and return. |
| 11 | * |
| 12 | * calling sequence: |
| 13 | * integer flag |
| 14 | * external alfunc |
| 15 | * lastiv = alarm (intval, alfunc) |
| 16 | * where: |
| 17 | * intval = the alarm interval in seconds; 0 turns off the alarm. |
| 18 | * alfunc = the function to be called after the alarm interval, |
| 19 | * |
| 20 | * The returned value will be the time remaining on the last alarm. |
| 21 | */ |
| 22 | |
| 23 | #include <signal.h> |
| 24 | |
| 25 | long alarm_(sec, proc) |
| 26 | long *sec; |
| 27 | int (* proc)(); |
| 28 | { |
| 29 | register long lt; |
| 30 | |
| 31 | lt = alarm(1000); /* time to maneuver */ |
| 32 | |
| 33 | if (*sec) |
| 34 | signal(SIGALRM, proc); |
| 35 | |
| 36 | alarm(*sec); |
| 37 | return(lt); |
| 38 | } |