From b83c5ead168645fdae578bc3484d32183ef4af34 Mon Sep 17 00:00:00 2001
From: Eric Pouech <eric.pouech@wanadoo.fr>
Date: Mon, 6 Feb 2006 11:36:19 +0100
Subject: [PATCH] ntdll: Implemented IOCTL purge for serial objects.

---
 dlls/kernel/comm.c  | 34 ++++++++--------------------------
 dlls/ntdll/serial.c | 20 ++++++++++++++++++++
 2 files changed, 28 insertions(+), 26 deletions(-)

diff --git a/dlls/kernel/comm.c b/dlls/kernel/comm.c
index de959de7336..41ae7909699 100644
--- a/dlls/kernel/comm.c
+++ b/dlls/kernel/comm.c
@@ -848,37 +848,19 @@ BOOL WINAPI EscapeCommFunction(
  *  Terminates pending operations and/or discards buffers on a
  *  communication resource.
  *
+ * PARAMS
+ *
+ *      handle  [in] The communication resource to be purged
+ *      flags   [in] Flags for clear pending/buffer on input/output
+ *
  * RETURNS
  *
  *  True on success and false if the communications handle is bad.
  */
-BOOL WINAPI PurgeComm(
-    HANDLE handle, /* [in] The communication resource to be purged. */
-    DWORD  flags)  /* [in] Flags for clear pending/buffer on input/output. */
+BOOL WINAPI PurgeComm(HANDLE handle, DWORD flags)
 {
-     int fd;
-
-     TRACE("handle %p, flags %lx\n", handle, flags);
-
-     fd = get_comm_fd( handle, FILE_READ_DATA );
-     if(fd<0) return FALSE;
-
-     /*
-     ** not exactly sure how these are different
-     ** Perhaps if we had our own internal queues, one flushes them
-     ** and the other flushes the kernel's buffers.
-     */
-     if(flags&PURGE_TXABORT)
-         tcflush(fd,TCOFLUSH);
-     if(flags&PURGE_RXABORT)
-         tcflush(fd,TCIFLUSH);
-     if(flags&PURGE_TXCLEAR)
-         tcflush(fd,TCOFLUSH);
-     if(flags&PURGE_RXCLEAR)
-         tcflush(fd,TCIFLUSH);
-     release_comm_fd( handle, fd );
-
-     return 1;
+    return DeviceIoControl(handle, IOCTL_SERIAL_PURGE, &flags, sizeof(flags),
+                           NULL, 0, NULL, NULL);
 }
 
 /*****************************************************************************
diff --git a/dlls/ntdll/serial.c b/dlls/ntdll/serial.c
index 0b15f6e1908..ecf025c719a 100644
--- a/dlls/ntdll/serial.c
+++ b/dlls/ntdll/serial.c
@@ -129,6 +129,20 @@ static const char* iocode2str(DWORD ioc)
     }
 }
 
+static NTSTATUS purge(int fd, DWORD flags)
+{
+    /*
+    ** not exactly sure how these are different
+    ** Perhaps if we had our own internal queues, one flushes them
+    ** and the other flushes the kernel's buffers.
+    */
+    if (flags & PURGE_TXABORT) tcflush(fd, TCOFLUSH);
+    if (flags & PURGE_RXABORT) tcflush(fd, TCIFLUSH);
+    if (flags & PURGE_TXCLEAR) tcflush(fd, TCOFLUSH);
+    if (flags & PURGE_RXCLEAR) tcflush(fd, TCIFLUSH);
+    return STATUS_SUCCESS;
+}
+
 /******************************************************************
  *		COMM_DeviceIoControl
  *
@@ -156,6 +170,12 @@ NTSTATUS COMM_DeviceIoControl(HANDLE hDevice,
 
     switch (dwIoControlCode)
     {
+    case IOCTL_SERIAL_PURGE:
+        if (lpInBuffer && nInBufferSize == sizeof(DWORD))
+            status = purge(fd, *(DWORD*)lpInBuffer);
+        else
+            status = STATUS_INVALID_PARAMETER;
+        break;
     case IOCTL_SERIAL_SET_BREAK_OFF:
 #if defined(TIOCSBRK) && defined(TIOCCBRK) /* check if available for compilation */
 	if (ioctl(fd, TIOCCBRK, 0) == -1)