Counting files in a given directory Post: 302472142

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Top Forums UNIX for Advanced & Expert Users Counting files in a given directory Post 302472142 by Corona688 on Tuesday 16th of November 2010 11:30:09 AM

11-16-2010

Registered User

Anything that counts files will have to do so the same way: checking directory entries. So there's no special "faster ls". (If there was, why wouldn't we use it for everything?)

If you can compile on this machine, this program can provide a running total, updated once a second:

Code:

#include <stdio.h>
#include <time.h>

int lines=0;

int main(void)
{
	time_t timer=time(NULL);
	char buf[16384];
	while(fgets(buf, 16384, stdin) != NULL)
	{
		lines++;

		if((time(NULL)-timer) > 1)
		{
			fprintf(stderr, "\r%d", lines);
			timer=time(NULL);
		}
	}

	printf("%d\n", lines);

	return(0);
}

It only reads from stdin.

---------- Post updated at 10:30 AM ---------- Previous update was at 10:26 AM ----------

Quote:

Originally Posted by verdepollo

I'm still trying to figure out how to count those files. It would be enough for me if I could find out an approximate value, and not the exact number.

Very approximate since it includes directory entries as well, but since counting 4 million files is going to be hard, it might have to do.

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sdl_addtimer

SDL_AddTimer(3) 						 SDL API Reference						   SDL_AddTimer(3)

NAME

       SDL_AddTimer - Add a timer which will call a callback after the specified number of milliseconds has elapsed.

SYNOPSIS

       #include "SDL.h"

       SDL_TimerID SDL_AddTimer(Uint32 interval, SDL_NewTimerCallback callback, void *param);

CALLBACK

       /* type definition for the "new" timer callback function */
       typedef Uint32 (*SDL_NewTimerCallback)(Uint32 interval, void *param);

DESCRIPTION

       Adds  a	callback  function  to	be run after the specified number of milliseconds has elapsed. The callback function is passed the current
       timer interval and the user supplied parameter from the SDL_AddTimer call and returns the next timer interval. If the returned  value  from
       the callback is the same as the one passed in, the periodic alarm continues, otherwise a new alarm is scheduled.

       To cancel a currently running timer call SDL_RemoveTimer with the timer ID returned from SDL_AddTimer.

       The  timer  callback function may run in a different thread than your main program, and so shouldn't call any functions from within itself.
       You may always call SDL_PushEvent, however.

       The granularity of the timer is platform-dependent, but you should count on it being at least 10 ms as this is the most common number. This
       means  that  if	you  request a 16 ms timer, your callback will run approximately 20 ms later on an unloaded system. If you wanted to set a
       flag signaling a frame update at 30 frames per second (every 33 ms), you might set a timer for 30 ms (see example below). If you  use  this
       function, you need to pass SDL_INIT_TIMER to SDL_Init.

RETURN VALUE

       Returns an ID value for the added timer or NULL if there was an error.

EXAMPLES

       my_timer_id = SDL_AddTimer((33/10)*10, my_callbackfunc, my_callback_param);

SEE ALSO

       SDL_RemoveTimer, SDL_PushEvent

SDL
							      Tue 11 Sep 2001, 23:01						   SDL_AddTimer(3)