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iopause.c (736B)

      1 /* Public domain. */
      2 
      3 #include "taia.h"
      4 #include <sys/select.h>
      5 #include <poll.h>
      6 
      7 #include "iopause.h"
      8 
      9 void iopause(struct pollfd *x,unsigned int len,struct taia *deadline,struct taia *stamp)
     10 {
     11   struct taia t;
     12   int millisecs;
     13   double d;
     14   int i;
     15 
     16   if (taia_less(deadline,stamp))
     17     millisecs = 0;
     18   else {
     19     t = *stamp;
     20     taia_sub(&t,deadline,&t);
     21     d = taia_approx(&t);
     22     if (d > 1000.0) d = 1000.0;
     23     millisecs = (int)( d * 1000.0 + 20.0 );
     24   }
     25 
     26   for (i = 0;i < len;++i)
     27     x[i].revents = 0;
     28 
     29   poll(x,len,millisecs);
     30   /* XXX: some kernels apparently need x[0] even if len is 0 */
     31   /* XXX: how to handle EAGAIN? are kernels really this dumb? */
     32   /* XXX: how to handle EINVAL? when exactly can this happen? */
     33 
     34 }