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    <p>I wrote a quick program that takes one argument, how many <code>A</code> characters to print to standard output per second (negative argument means no rate limiting). Hope this helps! :-) (On GNU libc, you will need to link your program with <code>-lrt</code>.)</p> <p>Edit: revised to print dot by default, unless a second argument is specified, in which case the first character of that is used. (And that means, if you want to print the NUL character, just specify an empty string as the second argument. :-))</p> <pre><code>#include &lt;math.h&gt; #include &lt;stdio.h&gt; #include &lt;stdlib.h&gt; #include &lt;time.h&gt; #include &lt;unistd.h&gt; int sleeptill(const struct timespec *when) { struct timespec now, diff; clock_gettime(CLOCK_REALTIME, &amp;now); diff.tv_sec = when-&gt;tv_sec - now.tv_sec; diff.tv_nsec = when-&gt;tv_nsec - now.tv_nsec; while (diff.tv_nsec &lt; 0) { diff.tv_nsec += 1000000000; --diff.tv_sec; } if (diff.tv_sec &lt; 0) return 0; return nanosleep(&amp;diff, 0); } int main(int argc, char **argv) { double rate = 0.0; char *endp; struct timespec start; double offset; if (argc &gt;= 2) { rate = strtod(argv[1], &amp;endp); if (endp == argv[1] || *endp) rate = 0.0; else rate = 1 / rate; if (!argv[2]) argv[2] = "."; } if (!rate) { fprintf(stderr, "usage: %s rate [char]\n", argv[0]); return 1; } clock_gettime(CLOCK_REALTIME, &amp;start); offset = start.tv_nsec / 1000000000.0; while (1) { struct timespec till = start; double frac; double whole; frac = modf(offset += rate, &amp;whole); till.tv_sec += whole; till.tv_nsec = frac * 1000000000.0; sleeptill(&amp;till); write(STDOUT_FILENO, argv[2], 1); } } </code></pre>
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    1. POdo stdout output with specific speed
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    1. USChris Jester-Young
    1. USChris Jester-Young
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    1. COWith the latest revision, you can now specify 0 as the rate. Technically, it doesn't wait "forever" (as it should, mathematically); rather, it waits until the end of time_t (January 2038, on platforms with a 32-bit time_t). That's still quite a while to wait, though. :-D
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    2. CONice stuff - thanks! How about putting it up on some revision control site (github, launchpad, sourceforge...) so people can add changes? Also, I think for performance it would be useful to write() a whole block of data at once.
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    3. COI deliberately used write() with no buffering so the data is guaranteed to come at a constant rate. To use buffering, change the write() call to putchar(*argv[2]). :-) I'll see what I can do about public revision control....
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