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trap documentation does not match trap behavior
From: |
John Gatewood Ham |
Subject: |
trap documentation does not match trap behavior |
Date: |
Thu, 11 May 2006 01:10:56 +0700 (ICT) |
Configuration Information [Automatically generated, do not change]:
Machine: i586
OS: linux-gnu
Compiler: gcc
Compilation CFLAGS: -DPROGRAM='bash' -DCONF_HOSTTYPE='i586'
-DCONF_OSTYPE='linux-gnu' -DCONF_MACHTYPE='i586-pc-linux-gnu'
-DCONF_VENDOR='pc' -DLOCALEDIR='/usr/share/locale' -DPACKAGE='bash' -DSHELL
-DHAVE_CONFIG_H -I. -I. -I./include -I./lib -g -O2
uname output: Linux www.buraphalinux.org 2.6.16.15 #1 Wed May 10 16:48:09 ICT
2006 i686 pentium4 i386 GNU/Linux
Machine Type: i586-pc-linux-gnu
Bash Version: 3.1
Patch Level: 17
Release Status: release
Description:
The info file says "Trapped signals are reset to their original
values in a child process when it is created." but this is not
true for me with crond and smartd for the SIGTERM signal.
Repeat-By:
crond is Dillon's cron with many patches; I get the same
problem with smartmontools' smartd daemon. Source for
our crond package if you need to see the source code
is in:
http://www.buraphalinux.org/download/bls1.0/sourcecd/source/1/base/dcron
#!/sbin/bash
# this launches a crond that will NOT get the SIGTERM
# from killall crond and does not shutdown
trap '' TERM
/usr/sbin/crond -l8
exit 0
#!/sbin/bash
# this launches a crond that will get the SIGTERM
# from killall crond and shutdown
doit() {
trap - TERM
/usr/sbin/crond -l8
trap '' TERM
}
trap '' TERM
doit
exit 0
Fix:
Remove that sentence from the documentation? Maybe
add a description in the same place in the info file
of what 'set -o ???' needed to control whether signals
get inherited or not?
- trap documentation does not match trap behavior,
John Gatewood Ham <=