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Full Discussion: C program to display a busy symbol while processing
Top Forums Programming C program to display a busy symbol while processing Post 302634471 by Corona688 on Thursday 3rd of May 2012 11:37:15 AM
Old 05-03-2012
Here's an extremely simple way:

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

void showspin(void)     // Shows a different charcter every time its called
{
        static char *spin="-/|\\", pos=0;
        if(!spin[++pos]) pos=0; // If we hit the NULL terminator, skip to beginning of string
        // We have to use stderr, so it doesn't buffer, since we're not printing a newline
        fprintf(stderr,"%c\r",spin[pos]); // Show character at position 'pos' in string
}

void dospin(int sig)    // Starts showing spinner repeatedly
{
        showspin();
        signal(SIGALRM, dospin); // Register this function to be called on SIGALRM
        alarm(1); // Cause SIGALRM to happen 1 second later
}

void nospin()           // Cancels the spinner
{
        alarm(0);
        fprintf(stderr," \r"); // Erase the spinner
}

int main(void)
{
        int n;
        dospin(SIGALRM);
        for(n=1; n<(1000*1000*2000); n++);
        nospin();
}

This User Gave Thanks to Corona688 For This Post:
rakeshkumar
 

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LEARN ABOUT MOJAVE

alarm

ALARM(3)						   BSD Library Functions Manual 						  ALARM(3)

NAME

     alarm -- set signal timer alarm

LIBRARY

     Standard C Library (libc, -lc)

SYNOPSIS

     #include <unistd.h>

     unsigned
     alarm(unsigned seconds);

DESCRIPTION

     This interface is made obsolete by setitimer(2).

     The alarm() function sets a timer to deliver the signal SIGALRM to the calling process after the specified number of seconds.  If an alarm
     has already been set with alarm() but has not been delivered, another call to alarm() will supersede the prior call.  The request alarm(0)
     voids the current alarm and the signal SIGALRM will not be delivered.

     Due to setitimer(2) restriction the maximum number of seconds allowed is 100000000.

RETURN VALUES

     The return value of alarm() is the amount of time left on the timer from a previous call to alarm().  If no alarm is currently set, the
     return value is 0.

SEE ALSO

     setitimer(2), sigaction(2), sigpause(2), sigvec(2), signal(3), sleep(3), ualarm(3), usleep(3)

HISTORY

     An alarm() function appeared in Version 7 AT&T UNIX.

BSD
								  April 19, 1994							       BSD
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