Patch-ID# 100399-02
Keywords: csh while loop memory leak echo EOF tty
Synopsis:  SunOS 4.1;4.1.1: csh memory leak tty gets EOF condition
Date: 10-Oct-91
 
SunOS release: 4.1 4.1.1
 
Topic: csh memory leak, tty gets EOF condition
 
BugId's fixed with this patch: 1066556 1062988 1009620 1035458 
			       1056394 1014273 1070306 1048065

Architectures for which this patch is available: sun3, sun3x, sun4, sun4c

Patches which may conflict with this patch:

Obsoleted by: SVR4

Problem Description: 

Bugid 1066556 -
Memory leak results in Memory Fault error

Bugid 1062998 -
Csh allocates memory and doesn't release it anymore.
After csh is invoked, and falls into a command 
execution mode, csh eats up all initial free memory it
had. Then it uses sbrk() through malloc() to expand its
data segment. (4096 bytes will be added to its data segments.)
But these 4096 be eaten up and eventually, csh eats up
all memory it can get.

Bugid 1009620 -
The 'foreach' command in csh increases process sizes

Bugid 1035458 -
The data and stack segment size (the SZ info in ps aux) of the csh in which
a while(1) loop is running increases in size by 4kB every 35 passes.  SZ
for the csh reaches several megabytes in just a few hours!

Bugid 1056394 -
there appears to be a memory leak in the c-shell when calling a program

Bugid 1014273 -
The source option that's built into the cshell doesn't relinquish
allocated memory.

Bugid 1070306 -
csh built-in command, 'echo',  not working correctly

Bugid 1048065 -
In csh, set the "filec" option.
Type "vi /usr/dict/words<return>ZZ<return>" quickly.  Vi starts up and
exits, and the shell sees an end-of-file condition on the tty when vi
is finished.  If ignoreeof isn't set, the shell exits, logging the user
out or closing his window.

INSTALL: 

	As root:

	Save the original copy of csh:
		mv /bin/csh /bin/csh.FCS
	Install the new copy of csh
		cp -p `arch`/{4,1,4.1.1}/csh /bin/csh
		chmod 0755 /bin/csh