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Full Discussion: Basic signal and alarm usage
Top Forums Programming Basic signal and alarm usage Post 302119133 by matrixmadhan on Monday 28th of May 2007 06:40:40 AM
Old 05-28-2007
Modified your code,

alarm prototype is not correct!

Check this,

Code:
#include <curses.h>
#include <signal.h>
#include <stdlib.h>
#include <stdio.h>

void handler(void);

void handler( void )
{
clear();
mvprintw(10, 10, "The ALARM is going off now!\n" );
refresh();
signal( SIGALRM, handler );
alarm( 5 );
}

int main( void )
{
initscr();
clear();
signal( SIGALRM, handler );
alarm( 5 );
mvprintw( 10, 10, "Snoozing now..zzzzzz\n");
getch();
refresh();
endwin();
return 0;
}

 

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LEARN ABOUT LINUX

sleep

SLEEP(3)						     Linux Programmer's Manual							  SLEEP(3)

NAME

       sleep - Sleep for the specified number of seconds

SYNOPSIS

       #include <unistd.h>

       unsigned int sleep(unsigned int seconds);

DESCRIPTION

       sleep() makes the calling thread sleep until seconds seconds have elapsed or a signal arrives which is not ignored.

RETURN VALUE

       Zero if the requested time has elapsed, or the number of seconds left to sleep, if the call was interrupted by a signal handler.

CONFORMING TO

       POSIX.1-2001.

BUGS

       sleep() may be implemented using SIGALRM; mixing calls to alarm(2) and sleep() is a bad idea.

       Using longjmp(3) from a signal handler or modifying the handling of SIGALRM while sleeping will cause undefined results.

SEE ALSO

       alarm(2), nanosleep(2), signal(2), signal(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/.

GNU
								    2010-02-03								  SLEEP(3)
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