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<span style="font-size: 10pt"><a href="/plan9/">Plan 9 from Bell Labs</a>&rsquo;s /usr/web/sources/contrib/aiju/tput.c</span></p>
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Copyright © 2009 Alcatel-Lucent.<br />
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#include &lt;u.h&gt;
#include &lt;libc.h&gt;

enum {buflen = 4096};

void
main()
{
       int rc, cpid, fd;
       static char buf[buflen];
       static uvlong bc, sec;
       double speed;

       bc = 0;
       sec = 0;
       cpid = rfork(RFPROC | RFMEM);
       if(cpid == 0) {
               while(1) {
                       sleep(1000);
                       speed = bc / ++sec;
                       if(speed &gt;= 1073741824) fprint(2, "%.2f GB/s\n", speed / 1073741824);
                       else if(speed &gt;= 1048576) fprint(2, "%.2f MB/s\n", speed / 1048576);
                       else if(speed &gt;= 1024) fprint(2, "%.2f KB/s\n", speed / 1024);
                       else fprint(2, "%.2f B/s\n", speed);
               }
       }
       while(1) {
               rc = read(0, buf, buflen);
               if(rc &lt; 0) break;
               bc += rc;
       }
       sprint(buf, "/proc/%d/note", cpid);
       fd = open(buf, OWRITE);
       write(fd, "kill", 4);
       sysfatal("%r");
}
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