From e6e81ff8b3af3d1c38ce54365a810c7c1ebdb201 Mon Sep 17 00:00:00 2001
From: David du Colombier <0intro@gmail.com>
Date: Thu, 6 Jan 1994 00:00:00 +0000
Subject: [PATCH] Plan 9 from Bell Labs 1994-01-06

---
 port/portdat.h |  3 ++-
 port/sysproc.c | 10 +++++++++-
 2 files changed, 11 insertions(+), 2 deletions(-)

diff --git a/port/portdat.h b/port/portdat.h
index cdbe7a9e698f4563b4db17ab4caa213a4e8792fc..7e5051153c99cdee23be9d8d0f4bc9905c2b44f3 100644
--- a/port/portdat.h
+++ b/port/portdat.h
@@ -315,7 +315,8 @@ enum
 	SG_PHYSICAL	= 05,
 	SG_SHDATA	= 06,
 
-	SG_RONLY	= 040,		/* Segment is read only */
+	SG_RONLY	= 0040,		/* Segment is read only */
+	SG_CEXEC	= 0100,		/* Detach at exec */
 };
 
 #define PG_ONSWAP	1
diff --git a/port/sysproc.c b/port/sysproc.c
index 07ff2582fd36e9fc723865422ee13c2cd1d0945e..cb6cc607867fdadfcc8f47dd8a617826ce86f4b3 100644
--- a/port/sysproc.c
+++ b/port/sysproc.c
@@ -330,7 +330,15 @@ sysexec(ulong *arg)
 	 */
 	for(i = SSEG; i <= BSEG; i++) {
 		putseg(up->seg[i]);
-		up->seg[i] = 0;	    /* prevent a second free if we have an error */
+		/* prevent a second free if we have an error */
+		up->seg[i] = 0;
+	}
+	for(i = BSEG+1; i < NSEG; i++) {
+		s = up->seg[i];
+		if(s != 0 && (s->type&SG_CEXEC)) {
+			putseg(s);
+			up->seg[i] = 0;
+		}
 	}
 
 	/*