>From 666dec6b34e1204b173672f9bad47f34cd8bad3f Mon Sep 17 00:00:00 2001
From: Paul Eggert <address@hidden>
Date: Fri, 27 Mar 2015 15:01:35 -0700
Subject: [PATCH] nohup: clarify stdin redirection

Problem reported by Isaac Schwabacher in:
http://bugs.gnu.org/20214
* doc/coreutils.texi (nohup invocation): Clarify that when nohup's
stdin gets redirected, it's unreadable.
* doc/coreutils.texi (nohup invocation):
* src/nohup.c (usage): Don't promise /dev/null.
---
 doc/coreutils.texi | 13 +++++++------
 src/nohup.c        |  2 +-
 2 files changed, 8 insertions(+), 7 deletions(-)

diff --git a/doc/coreutils.texi b/doc/coreutils.texi
index 6110cec..3cbce63 100644
--- a/doc/coreutils.texi
+++ b/doc/coreutils.texi
@@ -16714,12 +16714,13 @@ out.  Synopsis:
 nohup @var{command} address@hidden@dots{}
 @end example
 
-If standard input is a terminal, it is redirected from
address@hidden/dev/null} so that terminal sessions do not mistakenly consider
-the terminal to be used by the command.  This is a GNU
-extension; programs intended to be portable to non-GNU hosts
-should use @samp{nohup @var{command} address@hidden@dots{} </dev/null}
-instead.
+If standard input is a terminal, redirect it so that terminal sessions
+do not mistakenly consider the terminal to be used by the command.
+Make the substitute file descriptor unreadable, so that commands that
+mistakenly attempt to read from standard input can report an error.
+This redirection is a GNU extension; programs intended to be portable
+to non-GNU hosts can use @samp{nohup @var{command} address@hidden@dots{}
+0>/dev/null} instead.
 
 @flindex nohup.out
 If standard output is a terminal, the command's standard output is appended
diff --git a/src/nohup.c b/src/nohup.c
index 9bc8686..8cdaced 100644
--- a/src/nohup.c
+++ b/src/nohup.c
@@ -63,7 +63,7 @@ Run COMMAND, ignoring hangup signals.\n\
       fputs (HELP_OPTION_DESCRIPTION, stdout);
       fputs (VERSION_OPTION_DESCRIPTION, stdout);
       printf (_("\n\
-If standard input is a terminal, redirect it from /dev/null.\n\
+If standard input is a terminal, redirect it from an unreadable file.\n\
 If standard output is a terminal, append output to 'nohup.out' if possible,\n\
 '$HOME/nohup.out' otherwise.\n\
 If standard error is a terminal, redirect it to standard output.\n\
-- 
2.1.0