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[unix-history] / usr / src / usr.bin / window / wwiomux.c

#ifndef lint
static  char *sccsid = "@(#)wwiomux.c   1.5 83/07/22";
#endif

#include "ww.h"

extern int _wwdtablesize;

wwforce(imask)
register int *imask;
{
       register struct ww *w;
       char buf[512];
       register int n;

       for (w = wwhead; w; w = w->ww_next)
               if (w->ww_pty >= 0)
                       *imask |= 1 << w->ww_pty;
       n = select(_wwdtablesize, imask,
               (int *)0, (int *)0, (struct timeval *)0);
       if (n <= 0)
               return -1;
       for (w = wwhead; w; w = w->ww_next) {
               if (*imask & 1<<w->ww_pty) {
                       n = read(w->ww_pty, buf, sizeof buf);
                       if (n > 0)
                               wwwrite(w, buf, n);
               }
       }
       return 0;
}