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/************************************************************************
* beat.c - cheap little metronome to run in the background and use
* system beep so as not to tie up /dev/sequencer.
*
* This code was written by by Nathan Laredo (laredo@gnu.ai.mit.edu)
* Source code may be freely distributed in unmodified form.
*************************************************************************/
#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
int main(argc, argv)
int argc;
char **argv;
{
unsigned long i, j;
if (argc != 2) {
fprintf(stderr, "usage: %s tempo in beats per minute\n", argv[0]);
exit(1);
}
i = atoi(argv[1]);
if (i < 48 || i > 384) {
fprintf(stderr, "error: tempo should be between 48 and 384 bpm\n");
exit(-1);
}
j = 60000000 / i; /* get usec per beat */
while (fprintf(stderr, "\7"))
usleep(j);
exit(0);
}
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