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File Descriptors problem


From: Chris Robinson
Subject: File Descriptors problem
Date: Tue, 1 Apr 2003 15:14:49 +0200

From: address@hidden

To: address@hidden

Subject: Redirection: File Descriptor can't be closed/reopened.

Configuration Information [Automatically generated, do not change]:

Machine: i686

OS: linux-gnu

Compiler: gcc

Compilation
CFLAGS: -DPROGRAM='bash' -DCONF_HOSTTYPE='i686' -DCONF_OSTYPE='linux-gnu' -D
CONF_MACHTYPE='i686-pc-linux-gnu' -DCONF_VENDOR='pc' -DSHELL -DHAVE_CONFIG_H
 -I. -I. -I./include -I./lib -D_GNU_SOURCE -O2 -march=i386 -mcpu=i686

uname output: Linux develop.netpartner.co.za 2.4.18-14 #1 Wed Sep 4 12:13:11
EDT 2002 i686 athlon i386 GNU/Linux

Machine Type: i686-pc-linux-gnu

Bash Version: 2.05b

Patch Level: 0

Release Status: release

Description:

Given a file 'f' with the line 'aaa', the following code should display the
line

endlessly, but it only displays it once because the FD close/open statements
fail to

reopen the file at the beginning. I have tried using multiple FDs and
duplicating,

etc, but nothing will force a clean reopen of FD 3 on 'f':

Repeat-By:

3<f

while [ 1 ]; do

read x <&3

echo $x

if [ "$x" = "" ]; then

sleep 1

3<&-

3<f

fi

done






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