From 85e6f449590eeb6e09f7547733adf4c7137470d0 Mon Sep 17 00:00:00 2001
From: Michael R Sweet <michael.r.sweet@gmail.com>
Date: Wed, 6 Jan 1999 21:20:01 +0000
Subject: Added support for FD's under WIN32.

git-svn-id: file:///fltk/svn/fltk/trunk@186 ea41ed52-d2ee-0310-a9c1-e6b18d33e121
---
 src/Fl_win32.cxx | 96 ++++++++++++++++++++++++++++++++++++++++++++++++++------
 1 file changed, 87 insertions(+), 9 deletions(-)

(limited to 'src')

diff --git a/src/Fl_win32.cxx b/src/Fl_win32.cxx
index 2ac90f890..c2cff8897 100644
--- a/src/Fl_win32.cxx
+++ b/src/Fl_win32.cxx
@@ -1,5 +1,5 @@
 //
-// "$Id: Fl_win32.cxx,v 1.20 1999/01/04 19:25:02 mike Exp $"
+// "$Id: Fl_win32.cxx,v 1.21 1999/01/06 21:20:01 mike Exp $"
 //
 // WIN32-specific code for the Fast Light Tool Kit (FLTK).
 //
@@ -34,35 +34,111 @@
 #include <string.h>
 #include <stdio.h>
 #include <stdlib.h>
+#include <sys/types.h>
+#include <time.h>
+#include <winsock.h>
 
 ////////////////////////////////////////////////////////////////
 // interface to poll/select call:
 
-// fd's are not yet implemented.
-// On NT these are probably only used for network stuff, so this may
-// talk to a package that Wonko has proposed writing to make the network
-// interface system independent.
+// fd's are only implemented for sockets.  Microsoft Windows does not
+// have a unified IO system, so it doesn't support select() on files,
+// devices, or pipes...
 
 #define POLLIN 1
 #define POLLOUT 4
 #define POLLERR 8
 
-void Fl::add_fd(int n, int events, void (*cb)(int, void*), void *v) {}
+#define MAXFD 8
+#if !HAVE_POLL
+static fd_set fdsets[3];
+static int maxfd;
+#endif
+static int nfds;
+static struct pollfd fds[MAXFD];
+static struct {
+  void (*cb)(int, void*);
+  void* arg;
+} fd[MAXFD];
+
+void Fl::add_fd(int n, int events, void (*cb)(int, void*), void *v) {
+  int i;
+  if (nfds < MAXFD) {i = nfds; nfds++;} else {i = MAXFD-1;}
+  fds[i].fd = n;
+  fds[i].events = events;
+#if !HAVE_POLL
+  if (events & POLLIN) FD_SET(n, &fdsets[0]);
+  if (events & POLLOUT) FD_SET(n, &fdsets[1]);
+  if (events & POLLERR) FD_SET(n, &fdsets[2]);
+  if (n > maxfd) maxfd = n;
+#endif
+  fd[i].cb = cb;
+  fd[i].arg = v;
+}
 
 void Fl::add_fd(int fd, void (*cb)(int, void*), void* v) {
   Fl::add_fd(fd,POLLIN,cb,v);
 }
 
-void Fl::remove_fd(int n) {}
+void Fl::remove_fd(int n) {
+  int i,j;
+  for (i=j=0; i<nfds; i++) {
+    if (fds[i].fd == n);
+    else {if (j<i) {fd[j]=fd[i]; fds[j]=fds[i];} j++;}
+  }
+  nfds = j;
+#if !HAVE_POLL
+  FD_CLR(n, &fdsets[0]);
+  FD_CLR(n, &fdsets[1]);
+  FD_CLR(n, &fdsets[2]);
+  if (n == maxfd) maxfd--;
+#endif
+}
 
 MSG fl_msg;
 
 int fl_ready() {
-  return PeekMessage(&fl_msg, NULL, 0, 0, PM_NOREMOVE);
+  if (PeekMessage(&fl_msg, NULL, 0, 0, PM_NOREMOVE)) return 1;
+
+  timeval t;
+  t.tv_sec = 0;
+  t.tv_usec = 0;
+  fd_set fdt[3];
+  fdt[0] = fdsets[0];
+  fdt[1] = fdsets[1];
+  fdt[2] = fdsets[2];
+  return ::select(maxfd+1,&fdt[0],&fdt[1],&fdt[2],&t);
 }
 
 double fl_wait(int timeout_flag, double time) {
   int have_message;
+  timeval t;
+  fd_set fdt[3];
+  int n;
+
+
+  // For WIN32 we need to poll for socket input FIRST, since
+  // the event queue is not something we can select() on...
+
+  t.tv_sec = 0;
+  t.tv_usec = 0;
+
+  fdt[0] = fdsets[0];
+  fdt[1] = fdsets[1];
+  fdt[2] = fdsets[2];
+
+  if (::select(maxfd+1,&fdt[0],&fdt[1],&fdt[2],&t)) {
+    // We got something - do the callback!
+    for (int i = 0; i < nfds; i ++) {
+      int f = fds[i].fd;
+      short revents = 0;
+      if (FD_ISSET(f,&fdt[0])) revents |= POLLIN;
+      if (FD_ISSET(f,&fdt[1])) revents |= POLLOUT;
+      if (FD_ISSET(f,&fdt[2])) revents |= POLLERR;
+      if (fds[i].events & revents) fd[i].cb(f, fd[i].arg);
+    }
+  }
+
   // get the first message by waiting the correct amount of time:
   if (!timeout_flag) {
     GetMessage(&fl_msg, NULL, 0, 0);
@@ -77,11 +153,13 @@ double fl_wait(int timeout_flag, double time) {
       have_message = PeekMessage(&fl_msg, NULL, 0, 0, PM_REMOVE);
     }
   }
+
   // execute it, them execute any other messages that become ready during it:
   while (have_message) {
     DispatchMessage(&fl_msg);
     have_message = PeekMessage(&fl_msg, NULL, 0, 0, PM_REMOVE);
   }
+
   return time;
 }
 
@@ -797,5 +875,5 @@ void Fl_Window::make_current() {
 }
 
 //
-// End of "$Id: Fl_win32.cxx,v 1.20 1999/01/04 19:25:02 mike Exp $".
+// End of "$Id: Fl_win32.cxx,v 1.21 1999/01/06 21:20:01 mike Exp $".
 //
-- 
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