#include <sys/cdefs.h>
#ifndef lint
#if 0
static char sccsid[] = "@(#)wwiomux.c 8.1 (Berkeley) 6/6/93";
#else
__RCSID("$NetBSD: wwiomux.c,v 1.6 1997/11/21 08:37:30 lukem Exp $");
#endif
#endif
#include <sys/types.h>
#if !defined(OLD_TTY) && !defined(TIOCPKT_DATA)
#include <sys/ioctl.h>
#endif
#include <sys/time.h>
#include <fcntl.h>
#include <string.h>
#include <unistd.h>
#include "ww.h"
void
wwiomux()
{
struct ww *w;
fd_set imask;
volatile int n;
char *p;
char c;
struct timeval tv;
char noblock = 0;
for (;;) {
if (wwinterrupt()) {
wwclrintr();
return;
}
FD_ZERO(&imask);
n = -1;
for (w = wwhead.ww_forw; w != &wwhead; w = w->ww_forw) {
if (w->ww_pty < 0)
continue;
if (w->ww_obq < w->ww_obe) {
if (w->ww_pty > n)
n = w->ww_pty + 1;
FD_SET(w->ww_pty, &imask);
}
if (w->ww_obq > w->ww_obp &&
!ISSET(w->ww_pflags, WWP_STOPPED))
noblock = 1;
}
if (wwibq < wwibe) {
if (0 > n)
n = 0 + 1;
FD_SET(0, &imask);
}
if (!noblock) {
if (wwcurwin != 0)
wwcurtowin(wwcurwin);
wwupdate();
wwflush();
(void) setjmp(wwjmpbuf);
wwsetjmp = 1;
if (wwinterrupt()) {
wwsetjmp = 0;
wwclrintr();
return;
}
tv.tv_sec = 30;
tv.tv_usec = 0;
} else {
tv.tv_sec = 0;
tv.tv_usec = 10000;
}
wwnselect++;
n = select(n + 1, &imask, (fd_set *)0, (fd_set *)0, &tv);
wwsetjmp = 0;
noblock = 0;
if (n < 0)
wwnselecte++;
else if (n == 0)
wwnselectz++;
else {
if (FD_ISSET(0, &imask))
wwrint();
for (w = wwhead.ww_forw; w != &wwhead; w = w->ww_forw) {
if (w->ww_pty < 0 ||
!FD_ISSET(w->ww_pty, &imask))
continue;
wwnwread++;
p = w->ww_obq;
if (w->ww_type == WWT_PTY) {
if (p == w->ww_ob) {
w->ww_obp++;
w->ww_obq++;
} else
p--;
c = *p;
}
n = read(w->ww_pty, p, w->ww_obe - p);
if (n < 0) {
wwnwreade++;
(void) close(w->ww_pty);
w->ww_pty = -1;
} else if (n == 0) {
wwnwreadz++;
(void) close(w->ww_pty);
w->ww_pty = -1;
} else if (w->ww_type != WWT_PTY) {
wwnwreadd++;
wwnwreadc += n;
w->ww_obq += n;
} else if (*p == TIOCPKT_DATA) {
n--;
wwnwreadd++;
wwnwreadc += n;
w->ww_obq += n;
} else {
wwnwreadp++;
if (*p & TIOCPKT_STOP)
SET(w->ww_pflags, WWP_STOPPED);
if (*p & TIOCPKT_START)
CLR(w->ww_pflags, WWP_STOPPED);
if (*p & TIOCPKT_FLUSHWRITE) {
CLR(w->ww_pflags, WWP_STOPPED);
w->ww_obq = w->ww_obp =
w->ww_ob;
}
}
}
}
if ((w = wwcurwin) != 0 && w->ww_pty >= 0 &&
w->ww_obq > w->ww_obp &&
!ISSET(w->ww_pflags, WWP_STOPPED)) {
n = wwwrite(w, w->ww_obp, w->ww_obq - w->ww_obp);
if ((w->ww_obp += n) == w->ww_obq)
w->ww_obq = w->ww_obp = w->ww_ob;
noblock = 1;
continue;
}
for (w = wwhead.ww_forw; w != &wwhead; w = w->ww_forw)
if (w->ww_pty >= 0 && w->ww_obq > w->ww_obp &&
!ISSET(w->ww_pflags, WWP_STOPPED)) {
n = wwwrite(w, w->ww_obp,
w->ww_obq - w->ww_obp);
if ((w->ww_obp += n) == w->ww_obq)
w->ww_obq = w->ww_obp = w->ww_ob;
if (wwinterrupt())
break;
}
}
}