From: Chris Hanson <org/chris-hanson/cph>
Date: Fri, 6 Jan 1995 00:02:36 +0000 (+0000)
Subject: Set the NOINHERIT bit in all channels, so that the handles associated
X-Git-Tag: 20090517-FFI~6822
X-Git-Url: https://birchwood-abbey.net/git?a=commitdiff_plain;h=fb4b5424835170d1437ac187038e07b4ed6f0199;p=mit-scheme.git

Set the NOINHERIT bit in all channels, so that the handles associated
with those channels will not be inherited by subprocesses.  The
subprocess support will disable the bit in those channels that want to
be inherited.
---

diff --git a/v7/src/microcode/os2io.c b/v7/src/microcode/os2io.c
index 25ab024be..946623ea4 100644
--- a/v7/src/microcode/os2io.c
+++ b/v7/src/microcode/os2io.c
@@ -1,8 +1,8 @@
 /* -*-C-*-
 
-$Id: os2io.c,v 1.2 1994/12/19 22:31:30 cph Exp $
+$Id: os2io.c,v 1.3 1995/01/06 00:02:36 cph Exp $
 
-Copyright (c) 1994 Massachusetts Institute of Technology
+Copyright (c) 1994-95 Massachusetts Institute of Technology
 
 This material was developed by the Scheme project at the Massachusetts
 Institute of Technology, Department of Electrical Engineering and
@@ -39,6 +39,7 @@ extern void OS2_initialize_console_channel (Tchannel);
 extern void OS2_initialize_pipe_channel (Tchannel);
 
 static enum channel_type handle_channel_type (LHANDLE);
+static void handle_noinherit (LHANDLE);
 
 size_t OS_channel_table_size;
 struct channel * OS2_channel_table;
@@ -97,6 +98,7 @@ OS2_make_channel (LHANDLE handle, unsigned int mode)
       channel += 1;
     }
   type = (handle_channel_type (handle));
+  handle_noinherit (handle);
   (CHANNEL_HANDLE (channel)) = handle;
   (CHANNEL_TYPE (channel)) = type;
   (CHANNEL_OPEN (channel)) = 1;
@@ -158,6 +160,20 @@ handle_channel_type (LHANDLE handle)
   OS2_error_anonymous ();
   return (channel_type_unknown);
 }
+
+static void
+handle_noinherit (LHANDLE handle)
+{
+  ULONG state;
+  STD_API_CALL (dos_query_fh_state, (handle, (& state)));
+  /* Magic mask 0xFF88 zeroes out high bits and two fields
+     required to be zero by the spec.  When testing, the high
+     bits were not zero, and this caused the system call to
+     complain.  */
+  state &= 0xFF88;
+  STD_API_CALL
+    (dos_set_fh_state, (handle, (state | OPEN_FLAGS_NOINHERIT)));
+}
 
 void
 OS_channel_close (Tchannel channel)