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Full Discussion: Basic signal and alarm usage
Top Forums Programming Basic signal and alarm usage Post 302119406 by Perderabo on Tuesday 29th of May 2007 06:50:32 PM
Old 05-29-2007
Quote:
Originally Posted by porter
so what will the following do?
I guess it demonstrates that you are able to generate an incorrect program that doesn't use function prototypes. This suggests that you think this is proof that function prototypes are required and possibly even that the original K&R C supported or required function prototypes. It must at least be true that you think the addition of a function prototype is the only way to fix the program. (I remain convinced that a function definition would fix it as well.) Oh well, at least you finally contributed some code to this thread.

A quote for anyone who is interested...

Quote:
A note of history: The biggest change between ANSI C and earlier versions is how functions are declared and defined.
...
The new syntax of function prototypes makes it much easier for a compiler to detect errors in the number of arguments or their types. The old style of declaration and definition still works in ANSI C, at least for a transition period, but we strongly recommend that you use the new form when you have a compiler that supports it.
From The C Programming Language Second Edition by Brian Kernighan and Dennis Ritchie

porter, you and I will simply have to agree to disagree on whether or not function prototypes are currently required as well as whether or not function prototypes were supported (or required) by the original K&R C. I am closing this thread.
 

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LEARN ABOUT CENTOS

alarm

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, any pending alarm is canceled.

       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 3.53 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								    2013-04-18								  ALARM(2)
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