bin/72501: script(1) loops after EOF is read

[Michiel Boland]

>Number:         72501
>Category:       bin
>Synopsis:       script(1) loops after EOF is read
>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:   Mon Oct 11 07:30:27 GMT 2004
>Closed-Date:
>Last-Modified:
>Originator:     Michiel Boland
>Release:        FreeBSD 6.0-CURRENT i386
>Organization:
>Environment:
System: FreeBSD leefnet.office.internl.net 6.0-CURRENT FreeBSD 6.0-CURRENT #0: Sat Oct 9 15:53:21 CEST 2004 root at leefnet.office.internl.net:/usr/obj/usr/src/sys/LEEFNET i386


	
>Description:
The script(1) program loops and consumes all CPU after it reads EOF from
standard input.
>How-To-Repeat:
Start an xterm.
In the xterm, become another user (actually, 'su - $USER' is sufficient)
Type 'script'.
Delete the xterm window.
>Fix:
Quick fix: back out rev 1.24 of src/usr.bin/script/script.c.
Better: find out why writing zero-length bytes to a pty controller does not
generate EOF on the pty slave. (This is what the commit message for 1.24
of script.c claims will happen.)

>Release-Note:
>Audit-Trail:
>Unformatted: