Date: Sun, 6 May 2001 14:39:24 -0700 (PDT) From: Jin Guojun (DSD staff) <jin@iss-p1.lbl.gov> To: FreeBSD-gnats-submit@freebsd.org Subject: bin/27163: sh trap TSTP () deadly hangs Message-ID: <200105062139.f46LdO606527@iss-p1.lbl.gov>
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>Number: 27163
>Category: bin
>Synopsis: sh trap TSTP () deadly hangs
>Confidential: no
>Severity: non-critical
>Priority: medium
>Responsible: freebsd-bugs
>State: open
>Quarter:
>Keywords:
>Date-Required:
>Class: sw-bug
>Submitter-Id: current-users
>Arrival-Date: Sun May 06 14:40:01 PDT 2001
>Closed-Date:
>Last-Modified:
>Originator:
>Release: FreeBSD 4.3-RELEASE i386
>Organization:
>Environment:
System: FreeBSD iss-p1.lbl.gov 4.3-RELEASE FreeBSD 4.3-RELEASE #0: Wed May 2 11:12:43 PDT 2001 root@iss-p1.lbl.gov:/usr/src/sys/compile/MinMax i386
FreeBSD 4.3-RELEASE
>Description:
According to the signal manpage:
Except for the SIGKILL and SIGSTOP signals, the
signal() function allows for a signal to be caught, to be ignored, or to
generate an interrupt. These signals are defined in the file <signal.h>:
Name Default Action Description
...
Would this imply that /bin/sh can trap (catch) the SIGTSTP ?
However, it is not. Try the following script, it deadly hangs
if "" pressed.
>How-To-Repeat:
---------- sh script -----
trap "echo do not try this; exit" TSTP
while [ 1 ] ; do
date
sleep 2
done
---------- end of sh script -----
sh script
Sun May 6 13:26:05 PDT 2001
Sun May 6 13:26:07 PDT 2001
>Fix:
>Release-Note:
>Audit-Trail:
>Unformatted:
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