ntdll: Add a configure check for the tcdrain function.

Also remove the tcgetattr check that is no longer used.

configure

@@ -13436,7 +13436,7 @@ for ac_func in \
 	strtoll \
 	strtoull \
 	symlink \
-	tcgetattr \
+	tcdrain \
 	thr_kill2 \
 	timegm \
 	usleep \

configure.ac

@@ -2063,7 +2063,7 @@ AC_CHECK_FUNCS(\
 	strtoll \
 	strtoull \
 	symlink \
-	tcgetattr \
+	tcdrain \
 	thr_kill2 \
 	timegm \
 	usleep \

dlls/ntdll/file.c

@@ -2777,14 +2777,7 @@ NTSTATUS WINAPI NtFlushBuffersFile( HANDLE hFile, IO_STATUS_BLOCK* IoStatusBlock
 
     if (!ret && type == FD_TYPE_SERIAL)
     {
-        while (tcdrain( fd ) == -1)
-        {
-            if (errno != EINTR)
-            {
-                ret = FILE_GetNtStatus();
-                break;
-            }
-        }
+        ret = COMM_FlushBuffersFile( fd );
     }
     else
     {

dlls/ntdll/ntdll_misc.h

@@ -142,6 +142,7 @@ extern NTSTATUS TAPE_DeviceIoControl(HANDLE hDevice,
                                      ULONG IoControlCode,
                                      LPVOID lpInBuffer, DWORD nInBufferSize,
                                      LPVOID lpOutBuffer, DWORD nOutBufferSize) DECLSPEC_HIDDEN;
+extern NTSTATUS COMM_FlushBuffersFile( int fd ) DECLSPEC_HIDDEN;
 
 /* file I/O */
 struct stat;

dlls/ntdll/serial.c

@@ -1342,3 +1342,29 @@ NTSTATUS COMM_DeviceIoControl(HANDLE hDevice,
                              lpOutBuffer, nOutBufferSize);
     return status;
 }
+
+NTSTATUS COMM_FlushBuffersFile( int fd )
+{
+#ifdef HAVE_TCDRAIN
+    while (tcdrain( fd ) == -1)
+    {
+        if (errno != EINTR) return FILE_GetNtStatus();
+    }
+    return STATUS_SUCCESS;
+#elif defined(TIOCDRAIN)
+    while (ioctl( fd, TIOCDRAIN ) == -1)
+    {
+        if (errno != EINTR) return FILE_GetNtStatus();
+    }
+    return STATUS_SUCCESS;
+#elif defined(TCSBRK)
+    while (ioctl( fd, TCSBRK, 1 ) == -1)
+    {
+        if (errno != EINTR) return FILE_GetNtStatus();
+    }
+    return STATUS_SUCCESS;
+#else
+    ERR( "not supported\n" );
+    return STATUS_NOT_IMPLEMENTED;
+#endif
+}

include/config.h.in

@@ -1068,8 +1068,8 @@
 /* Define to 1 if you have the <sys/wait.h> header file. */
 #undef HAVE_SYS_WAIT_H
 
-/* Define to 1 if you have the `tcgetattr' function. */
-#undef HAVE_TCGETATTR
+/* Define to 1 if you have the `tcdrain' function. */
+#undef HAVE_TCDRAIN
 
 /* Define to 1 if you have the <termios.h> header file. */
 #undef HAVE_TERMIOS_H