OBSOLETE Patch-ID# 101552-01
Keywords: kernel pty libc Dell DSA panic SCSI
Synopsis: OBSOLETED by 102022
Date: Mar/04/94

Solaris Release: 2.1 x86

SunOS Release: 5.1 x86

Unbundled Product:

Unbundled Release:

Relevant Architectures:

BugId's fixed with this patch: 1147603 1113208 1139830 1146857

Changes incorporated in this version:

Patches accumulated and obsoleted by this patch: 101375-02

Patches which conflict with this patch:

Patches required with this patch:

Obsoleted by: 102022 on Sep/15/94

Files included with this patch:

	kernel/unix
	usr/kernel/drv/ptc
	usr/kernel/drv/pts
	etc/lib/ld.so.1
	usr/lib/ld.so.1
	usr/lib/libc.a
	usr/lib/libc.so
	usr/lib/libc.so.1
	usr/lib/libp/libc.a
	usr/lib/pics/libc_pic.a


Problem Description:

1146857
Under heavy load, while returning from mutex_exit, T_DONTSWAP is
decremented in the assembly language function,
and then again in C code. Thus a thread holding a mutex
gets its T_DONTSWAP value set from 0 to 0xffffffff,
and is swapped out while holding a mutex.
In the Dell dsa driver, the thread holding the key
mutex in the dmult_strategy routine sleeps forever,
thus ending all disk and tape io on the system.

(From 101375-02)

1113208
SunOS 5.1 does not support more than 48 ptys, which limits
the number of rlogins and telnets.  The problem is rooted in two
places. The pseudo-tty driver (/usr/kernel/drv/pts) has a built-in
limit of 48.  The library routines getut() and getutx() have a
problem that prevents them from supporting more than 62 users.
This patch provides fixes to libc and pts that support both
problems.

1139830
Change the way nodes are named to allow for greater than 64 names.

1147603
The maximum number of pseudo terminal slaves is hardcoded to 48.  While it
is possible to change pt_cnt in /etc/system to any value, it is not used
as one would expect.


Patch Installation Instructions:
--------------------------------
Generic 'installpatch' and 'backoutpatch' scripts are provided
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Other specific or unique installation instructions may also be
necessary and should be described below.
 
Special Install Instructions:
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