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Allocating new fds through redirection


From: Christian Ullrich
Subject: Allocating new fds through redirection
Date: Wed, 20 Jul 2011 11:52:28 +0200 (CEST)

Configuration Information [Automatically generated, do not change]:
Machine: i386
OS: freebsd8.1
Compiler: cc
Compilation CFLAGS:  -DPROGRAM='bash' -DCONF_HOSTTYPE='i386' 
-DCONF_OSTYPE='freebsd8.1' -DCONF_MACHTYPE='i386-portbld-freebsd8.1' 
-DCONF_VENDOR='portbld' -DLOCALEDIR='/usr/local/share/locale' -DPACKAGE='bash' 
-DSHELL  -DHAVE_CONFIG_H   -I.  -I. -I./include -I./lib  -I/usr/local/include 
-O -pipe -march=prescott
uname output: FreeBSD infra-build.traditionsa.lu 8.1-20101216-SNAP FreeBSD 
8.1-20101216-SNAP #0: Thu Dec 16 09:27:37 UTC 2010     
address@hidden:/usr/obj/usr/src/sys/GENERIC  i386
Machine Type: i386-portbld-freebsd8.1

Bash Version: 4.1
Patch Level: 10
Release Status: release

Description:
        bash's actual behavior differs from what the manual says regarding
        the allocation of new file descriptors by redirection:

                Each redirection that may be preceded by a file descriptor
                number may instead be preceded by a word of the form
                {varname}. In this case, for each redirection operator
                except >&- and <&-, the shell will allocate a file
                descriptor greater than 10 and assign it to {varname}.
                If >&- or <&- is preceded by {varname}, the value of
                varname defines the file descriptor to close.

        On this system, the first fd created by this procedure is
        number 10, which is not greater than 10.

        This is probably more of a documentation bug than a bash bug.


Repeat-By:
        exec {NEW}>&1
        echo $NEW

Fix:
        If it's a documentation bug, "greater than 9".

        If it's a bash bug,

--- bash-4.1/redir.c.orig       2011-07-20 11:48:56.000000000 +0200
+++ bash-4.1/redir.c    2011-07-20 11:49:05.000000000 +0200
@@ -57,7 +57,7 @@
 #  include "input.h"
 #endif

-#define SHELL_FD_BASE  10
+#define SHELL_FD_BASE  11

 int expanding_redir;


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