[src/trunk]: src/bin/sh When opening a file descritor with "exec n>/file" (an...

[kre <kre%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/b7d07bec1cac
branches:  trunk
changeset: 823927:b7d07bec1cac
user:      kre <kre%NetBSD.org@localhost>
date:      Sun May 14 17:27:05 2017 +0000

description:
When opening a file descritor with "exec n>/file" (and similar) only
set the close-on-exec bit when not in posix mode (to comply with posix...)
OK: christos@

diffstat:

 bin/sh/redir.c |   6 +++---
 bin/sh/sh.1    |  23 ++++++++++++++++++-----
 2 files changed, 21 insertions(+), 8 deletions(-)

diffs (85 lines):

diff -r f0228e548a98 -r b7d07bec1cac bin/sh/redir.c
--- a/bin/sh/redir.c    Sun May 14 15:36:45 2017 +0000
+++ b/bin/sh/redir.c    Sun May 14 17:27:05 2017 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: redir.c,v 1.54 2017/04/29 15:14:28 kre Exp $   */
+/*     $NetBSD: redir.c,v 1.55 2017/05/14 17:27:05 kre Exp $   */
 
 /*-
  * Copyright (c) 1991, 1993
@@ -37,7 +37,7 @@
 #if 0
 static char sccsid[] = "@(#)redir.c    8.2 (Berkeley) 5/4/95";
 #else
-__RCSID("$NetBSD: redir.c,v 1.54 2017/04/29 15:14:28 kre Exp $");
+__RCSID("$NetBSD: redir.c,v 1.55 2017/05/14 17:27:05 kre Exp $");
 #endif
 #endif /* not lint */
 
@@ -338,7 +338,7 @@
                abort();
        }
 
-       cloexec = fd > 2 && (flags & REDIR_KEEP) == 0;
+       cloexec = fd > 2 && (flags & REDIR_KEEP) == 0 && !posix;
        if (f != fd) {
                if (copyfd(f, fd, cloexec) < 0) {
                        int e = errno;
diff -r f0228e548a98 -r b7d07bec1cac bin/sh/sh.1
--- a/bin/sh/sh.1       Sun May 14 15:36:45 2017 +0000
+++ b/bin/sh/sh.1       Sun May 14 17:27:05 2017 +0000
@@ -1,4 +1,4 @@
-.\"    $NetBSD: sh.1,v 1.140 2017/05/14 14:14:39 kre Exp $
+.\"    $NetBSD: sh.1,v 1.141 2017/05/14 17:27:05 kre Exp $
 .\" Copyright (c) 1991, 1993
 .\"    The Regents of the University of California.  All rights reserved.
 .\"
@@ -382,7 +382,11 @@
 the file given by the
 .Ev ENV
 variable is read at startup by a non-interactive shell.
-It also controls whether the shell treats
+It also controls whether file descriptors greater than 2
+opened using the
+.Ic exec
+built-in command are passed on to utilities executed,
+and whether the shell treats
 an empty compound statement as a syntax error (required
 by posix) or permits it.
 Empty compound statements
@@ -1769,7 +1773,10 @@
 command are marked as permanent, so that they are not undone when the
 .Ic exec
 command finishes.
-File descriptors created via such redirections are marked close-on-exec
+When the
+.Ic posix
+option is not set,
+file descriptors created via such redirections are marked close-on-exec
 (see
 .Xr open 2
 .Dv O_CLOEXEC
@@ -1783,7 +1790,12 @@
 (except
 .Xr ksh 1 ) ,
 made those file descriptors available to exec'ed processes.
-To turn off the close-on-exec mark,
+This behavior is required by the
+.Tn POSIX
+standard, so when the
+.Ic posix
+option is set, this shell also acts that way.
+To be assured the close-on-exec setting is off,
 redirect the descriptor to (or from) itself,
 either when invoking a command for which the descriptor is wanted open,
 or by using
@@ -1795,7 +1807,8 @@
 and pass it to all commands invoked subsequently.
 Alternatively, see the
 .Ic fdflags
-command below.
+command below, which can set, or clear, this, and other,
+file descriptor flags.
 .It exit Op Ar exitstatus
 Terminate the shell process.
 If