Patch Name: PHSS_23672

Patch Description: s700_800 10.20 HP DCE/9000 1.5 libcma patch

Creation Date: 01/05/24

Post Date:  01/05/30

Hardware Platforms - OS Releases:
	s700: 10.20
	s800: 10.20

Products: N/A

Filesets:
	DCE-Core.DCE-CORE-SHLIB,B.10.20
	DCE-CoreTools.DCE-BPRG,B.10.20

Automatic Reboot?: No

Status: General Release

Critical: No

Path Name: /hp-ux_patches/s700_800/10.X/PHSS_23672

Symptoms:
	PHSS_23672:
	1.JAGad53376 : When vfork() is called in threaded
	  environment in some cases the application aborts due
	  to lack of memory.

	PHSS_20608:
	1.  JAGab84972  :  cma_poll() hogs CPU

Defect Description:
	PHSS_23672:
	1.JAGad53376 : The expected behavior of vfork is that the
	  child process does not inherit the parent data but only
	  shares it. But in the case of a threaded application each
	  time that the vfork is used, the required memory doubles
	  even though the forked process will not use it. This is
	  because in the threaded environment vfork() is wrapped to
	  cma_fork() which just calls fork().
	Resolution:
	  A new environment variable called '_VFORK_NO_CMA' needs
	  to be set by the user which would be used by libc. If
	  this variable is set, then the vfork() stub in libc will
	  directly call the actual vfork system call and won't go
	  through the cma wrapper 'cma_fork'. We retained the
	  default(previous) behavior as it is in order, to avoid the
	  risk of breaking any existing customer applications that
	  assume fork semantics for vfork. So, the applications
	  will get the new behavior for vfork() only if they set
	  this environment variable. The exec() wrapper in libcma
	  has been changed not to modify any data, if the child was
	  created as a result of vfork(). This is needed as both
	  parent & child share the same data segment and we could
	  possibly corrupt the parent data space.

	PHSS_20608:
	1.  JAGab84972  :  With  PHSS_19739/40
	     the  behavior  of cma_poll()  has  changed  which
	     results in  threaded applications hogging CPU, when
	     poll()  is called under following conditions:
	     - pthread.h is included by the application and
	     - cma_init() is not called and
	     - The application is not multithreaded yet.
	     (i.e. there are no threads created)
	Resolution:
	     The  polling  interval  is  now initialized  before
	     the application goes multithreaded.

SR:
	8606184167 8606112629

Patch Files:
	/usr/lib/libcma.1
	/opt/dce/lib/libcma.a
	/opt/dce/include/dce/cma_ux.h

what(1) Output:
	/usr/lib/libcma.1:
		HP DCE/9000 1.5 PHSS_23672 Module: libcma.1 (Export)
			 Date: Apr  9 2001 10:01:06
	/opt/dce/lib/libcma.a:
		HP DCE/9000 1.5 PHSS_23672 Module: libcma.a (Export)
			 Date: Apr  9 2001 10:01:10
	/opt/dce/include/dce/cma_ux.h:
		HP DCE/9000 1.5

cksum(1) Output:
	1569563128 528384 /usr/lib/libcma.1
	335112710 612064 /opt/dce/lib/libcma.a
	1292313645 10356 /opt/dce/include/dce/cma_ux.h

Patch Conflicts: None

Patch Dependencies:
	s700: 10.20: PHSS_19739 PHCO_23684
	s800: 10.20: PHSS_19739 PHCO_23684

Hardware Dependencies: None

Other Dependencies: None

Supersedes:
	PHSS_20608

Equivalent Patches: None

Patch Package Size: 1240 KBytes

Installation Instructions:
	Please review all instructions and the Hewlett-Packard
	SupportLine User Guide or your Hewlett-Packard support terms
	and conditions for precautions, scope of license,
	restrictions, and, limitation of liability and warranties,
	before installing this patch.
	------------------------------------------------------------
	1. Back up your system before installing a patch.

	2. Login as root.

	3. Copy the patch to the /tmp directory.

	4. Move to the /tmp directory and unshar the patch:

		cd /tmp
		sh PHSS_23672

	5a. For a standalone system, run swinstall to install the
	    patch:

		swinstall -x autoreboot=true -x match_target=true \
			-s /tmp/PHSS_23672.depot

	By default swinstall will archive the original software in
	/var/adm/sw/patch/PHSS_23672.  If you do not wish to retain a
	copy of the original software, you can create an empty file
	named /var/adm/sw/patch/PATCH_NOSAVE.

	WARNING: If this file exists when a patch is installed, the
	         patch cannot be deinstalled.  Please be careful
		 when using this feature.

	It is recommended that you move the PHSS_23672.text file to
	/var/adm/sw/patch for future reference.

	To put this patch on a magnetic tape and install from the
	tape drive, use the command:

		dd if=/tmp/PHSS_23672.depot of=/dev/rmt/0m bs=2k

Special Installation Instructions:
	This patch becomes effective only if the following
	environment variable "_VFORK_NO_CMA" is set.
	*****IMPORTANT NOTE*****  -- Oracle 7.3.3 and above will
	need to be relinked. This patch contains changes to  the
	libcma library.  Applications such  as Oracle  that  use
	this  library  and  are   built  static  will need to be
	relinked. For  information  and  help  for  the  rebuild
	please contact your Oracle support personnel.