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Test Your Knowledge in Computers #877
Difficulty: Medium
A real-time operating system (RTOS) is an operating system (OS) intended to serve real-time applications that process data as it comes in, typically without buffer delays.
True or False?
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alarm(3f) [bsd man page]

ALARM(3F)																 ALARM(3F)

NAME
alarm - execute a subroutine after a specified time SYNOPSIS
integer function alarm (time, proc) integer time external proc DESCRIPTION
This routine arranges for subroutine proc to be called after time seconds. If time is ``0'', the alarm is turned off and no routine will be called. The returned value will be the time remaining on the last alarm. FILES
/usr/lib/libU77.a SEE ALSO
alarm(3C), sleep(3F), signal(3F) BUGS
Alarm and sleep interact. If sleep is called after alarm, the alarm process will never be called. SIGALRM will occur at the lesser of the remaining alarm time or the sleep time. 4.2 Berkeley Distribution May 15, 1985 ALARM(3F)

Check Out this Related Man Page

ALARM(2)						     Linux Programmer's Manual							  ALARM(2)

NAME
alarm - set an alarm clock for delivery of a signal SYNOPSIS
#include <unistd.h> unsigned int alarm(unsigned int seconds); DESCRIPTION
alarm() arranges for a SIGALRM signal to be delivered to the calling process in seconds seconds. If seconds is zero, no new alarm() is scheduled. In any event any previously set alarm() is canceled. RETURN VALUE
alarm() returns the number of seconds remaining until any previously scheduled alarm was due to be delivered, or zero if there was no pre- viously scheduled alarm. CONFORMING TO
SVr4, POSIX.1-2001, 4.3BSD. NOTES
alarm() and setitimer(2) share the same timer; calls to one will interfere with use of the other. sleep(3) may be implemented using SIGALRM; mixing calls to alarm() and sleep(3) is a bad idea. Scheduling delays can, as ever, cause the execution of the process to be delayed by an arbitrary amount of time. SEE ALSO
gettimeofday(2), pause(2), select(2), setitimer(2), sigaction(2), signal(2), sleep(3), time(7) COLOPHON
This page is part of release 3.27 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/. Linux 2008-06-12 ALARM(2)

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