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Full Discussion: Basic signal and alarm usage
Top Forums Programming Basic signal and alarm usage Post 302119369 by porter on Tuesday 29th of May 2007 01:18:34 PM
Old 05-29-2007
Quote:
Originally Posted by Perderabo
prototypes are a good idea but are never required in c.
Not true, they *are* required if the function has not already been seen and returns anything other than an int. This is true even in K&R C.

Two examples why....

1. if the function returns a double some architectures require an FPU pop even if the value is not used.

2. if the function returns a struct it requires a certain amount of extra stackspace to be allocated in addition to an extra hidden pointer.

Finally,

If using GNU C use the options -Wall and -Werror, they actually help.
 

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LEARN ABOUT REDHAT

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 process in seconds seconds.

       If seconds is zero, no new alarm is scheduled.

       In any event any previously set alarm is cancelled.

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 previ-
       ously scheduled alarm.

NOTES

       alarm and setitimer share the same timer; calls to one will interfere with use of the other.

       sleep() may be implemented using SIGALRM; mixing calls to alarm() and sleep() is a bad idea.

       Scheduling delays can, as ever, cause the execution of the process to be delayed by an arbitrary amount of time.

CONFORMING TO

       SVr4, SVID, POSIX, X/OPEN, BSD 4.3

SEE ALSO

       setitimer(2), signal(2), sigaction(2), gettimeofday(2), select(2), pause(2), sleep(3)

Linux								    1993-07-21								  ALARM(2)
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