From 49f7ea16756dd7f341edeecd2dee45083ab38945 Mon Sep 17 00:00:00 2001
From: Christopher Faylor <me@cgf.cx>
Date: Sat, 9 Nov 2002 03:17:40 +0000
Subject: [PATCH] * fhandler.h (class fhandler_pipe): New ioctl() method. *
 pipe.cc (fhandler_pipe::ioctl): New.

---
 winsup/cygwin/ChangeLog  |  5 +++++
 winsup/cygwin/fhandler.h |  1 +
 winsup/cygwin/pipe.cc    | 28 ++++++++++++++++++++++++++++
 3 files changed, 34 insertions(+)

diff --git a/winsup/cygwin/ChangeLog b/winsup/cygwin/ChangeLog
index 95735e1f0..e69c47880 100644
--- a/winsup/cygwin/ChangeLog
+++ b/winsup/cygwin/ChangeLog
@@ -1,3 +1,8 @@
+2002-11-06  Sergey Okhapkin  <sos@prospect.com.ru>
+
+	* fhandler.h (class fhandler_pipe): New ioctl() method.
+	* pipe.cc (fhandler_pipe::ioctl): New.
+
 2002-11-07  Christopher Faylor  <cgf@redhat.com>
 
 	* fhandler_serial.cc (fhandler_serial::ioctl): Fix typo.
diff --git a/winsup/cygwin/fhandler.h b/winsup/cygwin/fhandler.h
index 273475110..0e4267013 100644
--- a/winsup/cygwin/fhandler.h
+++ b/winsup/cygwin/fhandler.h
@@ -459,6 +459,7 @@ class fhandler_pipe: public fhandler_base
   int close ();
   void create_guard (SECURITY_ATTRIBUTES *sa) {guard = CreateMutex (sa, FALSE, NULL);}
   int dup (fhandler_base *child);
+  int ioctl (unsigned int cmd, void *);
   void fixup_after_fork (HANDLE);
   bool hit_eof ();
   void set_eof () {broken_pipe = true;}
diff --git a/winsup/cygwin/pipe.cc b/winsup/cygwin/pipe.cc
index b37a7751e..fe712e25e 100644
--- a/winsup/cygwin/pipe.cc
+++ b/winsup/cygwin/pipe.cc
@@ -13,6 +13,7 @@ details. */
 #include "winsup.h"
 #include <unistd.h>
 #include <errno.h>
+#include <sys/socket.h>
 #include "cygerrno.h"
 #include "security.h"
 #include "fhandler.h"
@@ -179,6 +180,33 @@ make_pipe (int fildes[2], unsigned int psize, int mode)
   return res;
 }
 
+int
+fhandler_pipe::ioctl (unsigned int cmd, void *p)
+{
+  int n;
+
+  switch (cmd)
+    {
+    case FIONREAD:
+      if (get_device () == FH_PIPEW)
+	{
+	  set_errno (EINVAL);
+	  return -1;
+	}
+      if (!PeekNamedPipe (get_handle (), NULL, 0, NULL, (DWORD *) &n, NULL))
+	{
+	  __seterrno ();
+	  return -1;
+	}
+      break;
+    default:
+      return fhandler_base::ioctl (cmd, p);
+      break;
+    }
+  *(int *) p = n;
+  return 0;
+}
+
 extern "C" int
 pipe (int filedes[2])
 {