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From: =?utf-8?Q?Dag-Erling_Sm=C3=B8rgrav?= <des@des.no>
To: Bruce Evans <brde@optusnet.com.au>
References: <44640.1268676905@critter.freebsd.dk>
	<20100317041500.V26092@delplex.bde.org>
Date: Wed, 17 Mar 2010 17:33:10 +0100
In-Reply-To: <20100317041500.V26092@delplex.bde.org> (Bruce Evans's message of
	"Wed, 17 Mar 2010 04:55:01 +1100 (EST)")
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Cc: svn-src-head@FreeBSD.org, Poul-Henning Kamp <phk@phk.freebsd.dk>,
	src-committers@FreeBSD.org, svn-src-all@FreeBSD.org
Subject: Re: svn commit: r205165 - head/lib/libc/gen
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Bruce Evans <brde@optusnet.com.au> writes:
> Even if the child causes the flush, the content of stdout and stderr
> is not flushed normally since it is redirected to /dev/null.  Unflushed
> input in stdin is handled more brokenly: although stdin is redirected
> to /dev/null, input on it can still be read via stdin's buffer.
> Inheriting unflushed input on other streams is a feature (unless these
> streams are open on fd's 0-2; then these streams will have the same
> corruption as std* streams open on their normal fd's 0-2).

how about

Index: gen/daemon.c
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
--- gen/daemon.c	(revision 204870)
+++ gen/daemon.c	(working copy)
@@ -37,6 +37,7 @@
 #include <errno.h>
 #include <fcntl.h>
 #include <paths.h>
+#include <stdio.h>
 #include <stdlib.h>
 #include <signal.h>
 #include <unistd.h>
@@ -81,6 +82,9 @@
 		(void)chdir("/");
=20
 	if (!noclose && (fd =3D _open(_PATH_DEVNULL, O_RDWR, 0)) !=3D -1) {
+		fpurge(stdin);
+		fflush(stdout);
+		fflush(stderr);
 		(void)_dup2(fd, STDIN_FILENO);
 		(void)_dup2(fd, STDOUT_FILENO);
 		(void)_dup2(fd, STDERR_FILENO);

?

DES
--=20
Dag-Erling Sm=C3=B8rgrav - des@des.no