Updated: 24-SEP-2003 (Use your browsers' Reload button to ensure you're viewing the most recent version)
VMS712_ACRTL-V0200 Alpha V7.1-2 DEC C RTL ECO Summary
/DATE=(AUTHOR="15-AUG-2001",ENTER="15-AUG-2001",-
EXPIRE="16-AUG-2003",FLASH="15-AUG-2001",MODIFY="17-NOV-1858",-
EDITORIAL_REVIEW="15-AUG-2001",TECHNICAL_REVIEW="15-AUG-2001")-
/GEOGRAPHY="USA"/SITE="EIRS"/OWNER="TIM"-
/FLAGS=(USA_CUSTOMER_READABLE,NOPOST_MESSAGE_DISPLAY,NOLOCAL,-
EUR_CUSTOMER_READABLE,GIA_CUSTOMER_READABLE,NOINIT_MESSAGE_DISPLAY,-
EDITORIAL_REVIEWED,FIELD_READABLE,FLASH,TECHNICAL_REVIEWED,READY)
Copyright (c) Compaq Computer Corporation 1999, 2001. All rights reserved.
New Kit Date : 16-AUG-2001
Modification Date: Not Applicable
Modification Type: Updated Kit Supersedes VMS712_ACRTL-V0100
OP/SYS: OpenVMS Alpha
COMPONENT: DEC C RTL
SOURCE: Compaq Computer Corporation
ECO INFORMATION:
ECO Kit Name: VMS712_ACRTL-V0200
DEC-AXPVMS-VMS712_ACRTL-V0200--4.PCSI
ECO Kits Superseded by This ECO Kit: VMS712_ACRTL-V0100
ECO Kit Approximate Size: 15,568 Blocks
Kit Applies To: OpenVMS Alpha V7.1-2
System/Cluster Reboot Necessary: Yes
Rolling Re-boot Supported: Yes
Installation Rating: INSTALL_3
3 - To be installed on all systems running
the listed versions of OpenVMS which
are experiencing the problems described.
Kit Dependencies:
The following remedial kit(s) (or later) must be installed BEFORE
installation of this kit:
o VMS712_UPDATE-V0300.
o VMS62TO71U2_PCSI-V0200.
In order to receive all the corrections listed in this
kit, the following remedial kits should also be installed:
None
ECO KIT SUMMARY:
An ECO kit exists for the DEC C RTL on OpenVMS Alpha V7.1-2. This
kit addresses the following problems:
PROBLEMS ADDRESSED IN KIT VMS712_ACRTL-V0200:
o Several problems in function mmap() and munmap() were
addressed.
- Calling function mmap() could result in memory corruption,
when specifying specific addresses in parameter addr.
Under complex conditions the CRTL sometimes allocated
internal memory needed by the CRTL for mmap() related
routines in the address space mapped, which could result
in memory corruption.
- Function mmap(), with parameter addr set to 0, now returns
the first available chunk of memory from the freelist (if
any). It previously returned a "best fit" chunk from the
freelist.
o After installation of previous CRTL ECO kits, user sees:
%LINK-I-DATMISMCH, creation date of <date> <time> in shareable
image SYS$COMMON:[SYSLIB]DECC$SHR.EXE;1
differs from date of <date> <time> in shareable image library
SYS$COMMON:[SYSLIB]IMAGELIB.OLB
Previous ECO kits did not correctly replace DECC$SHR.EXE in
the system IMAGELIB.OLB, which resulted in this message.
This change is Alpha only.
o The linker reported multiple definitions when linking programs
referencing the following symbols.
This was because C$ERRNO was not inserted in STARLET.OLB for
Selective search.
o C$_SIG0
o C$_SIGN
o C$_SIGPIPE
o C$_SIGCHLD
o C$_HOST_NOT_FOUND
o C$_TRY_AGAIN
o C$_NO_RECOVERY
o C$_NO_DATA
o C$_NO_ADDRESS
o C$_NO_TCP
o C$_NOSYSSHR
o C$_EXIT1
o C$_EXIT255
o C$_ILLSYSTDF
o C$_QSORT2BIG
This was a problem with previous CRTL ECO kits.
This change is Alpha only.
o Function mktime()'s algorithm locked thread specific data,
which didn't need to be done. This change uses stack
allocated data, and improves performance.
o Function open() had unnecessary calls to SYS$GETJPI. These
were removed.
o Several problems in function mmap() and munmap() were
addressed.
- Function munmap() would sometimes fail when releasing
memory allocated with MAP_ANON. This is because it
wrongly tried to deassign a file channel that was not
associated with the memory range.
- Function mmap() was incorrectly specifying global memory
when MAP_ANON is specified.
Change will only do this with flag MAP_SHARED specified.
o Function gettimeofday() now sets errno and vaxc$errno
appropriately if UTC time functions fail because of a system
service failure.
o The file creation functions (fopen, open, creat) have been
corrected to not inherit file attributes if a directory by the
same name exists for the file being created. For example,
creating a file named "foo." in a directory which contained a
"foo.dir" would incorrectly inherit file attributes from this
directory file.
o The stat function no longer puts the wrong values into
st_?time members of the stat structure. More precisely,
during daylight savings time the values of st_?time are no
longer one hour ahead from file creation/modification time
reported by the $DIRECTORY command.
o The time functions time, ftime, gettimeofday and getclock
would fail for a TDF (time differential factor) of -13 hours,
the value required in New Zealand. According to the U.S.
Naval Observatory information the valid range for the TDF is
-13.75 to +13, inclusive. The C RTL now allows this full
range.
o In the previous ECO kit, a change was introduced to the
function strptime() for XPG5-compatibility to handle
expressions for the 2-digit year format %y when the century
was not specified. The requirement is for 2-digit years in
the range 0-68 to be treated as 21st century and years in the
range 69-99 as 20th century. The 2-digit years in the range
69-99 were incorrectly being treated as 21st century.
o The execlp and execvp functions were unconditionally prefixing
the file specification of the image to be run in the child
process with "VAXC$PATH:" string. When passed a fully
qualified file specification, this would result in an invalid
file specification.
o The behavior of lseek() and fseek() at positions beyond the
end of data in a file were not conforming to the POSIX/ANSI
standard. The file was being physically null padded on disk
even though the standard only requires this null padding if
data is actually written at this point. In the case reported
by the user, seeking to the end of a file by using a large
offset would take a long time and may exhaust available disk
space. To get the POSIX behavior, you must define
DECC$POSIX_SEEK_STREAM_FILE as "ENABLE". The default behavior
is unchanged.
o The Compaq C RTL was enhanced to open all files for shared
access as if the "shr=del,get,put,upd" option was specified in
the open* or creat call. To enable this feature, define the
logical name DECC$FILE_SHARING to the value "ENABLE". The
value is case-insensitive and is checked only once per image
activation, not on a file-by-file basis.
o The Compaq C RTL was failing when the amount of data written
to a pipe exceeded the buffer size of that pipe. The RTL now
breaks the large write into a sequence of writes whose size is
the size of the underlying mailbox used to implement pipes.
o A problem was reported that the RTL could hang if exit were
called while threads were continuing to do I/O. Analysis
showed that the hang was caused by a thread holding the lock
necessary to close the file and the exit handler blocking on
this lock. The change implemented was to not attempt to close
files whose locks were currently in use.
o When a stream file is extended using ftruncate() it is
documented that the extended area will be filled with zeroes.
This is now done correctly. Prior to this change, the file
was not extended.
o The documentation of the select function states that it
returns either when a socket is ready to be read or written,
when the timeout period expires, or when exceptions occur. It
was not properly terminating when an exception occurred. This
problem was corrected by dynamically linking to and calling an
abort function in the socket library. A complete correction
to interrupting the select function will also require an ECO
kit from the Compaq TCP/IP product which includes this new
abort function.
o The fstat function was corrected to not access violate when
called with stdin, stdout, stderr, or a directory
specification.
o The chdir function was not well behaved when the calling
program passed an argument which was a search list logical.
The chdir function was unconditionally changing the logical
sys$disk to the first member of the search list and was
effectively dropping the remaining members. More work may be
done in this area in future releases of the C RTL.
PROBLEMS ADDRESSED IN KIT VMS712_ACRTL-V0100:
o The getenv() function has been corrected to check for a
Command Line Interpreter (CLI) symbol only when called
in user access mode. While DEC C RTL is a user-mode run
time library, a decision was made to correct getenv() in
order to make the library more robust. The reason for this
change is because calling the CLI from within exec or kernel
mode may result in an access violation.
With this fix, when called from inner access mode, the
getenv() function will search only the C environment list
and OpenVMS logical names.
This fix does not mean however that the user-mode only
restriction was lifted. It is still unsupported to call
the DEC C RTL functions, including getenv(), in any access
mode other than in user-mode.
o The strptime() function has been modified to comply with
X/Open CAE Specification System Interfaces and Headers
Issue 5 (commonly known as XPG5). In XPG5, how the
strptime() function processes the "%y" directive was changed
for a two-digit year within the century, if no century is
specified.
According to XPG5, for the "%y" directive, when a century is
not otherwise specified, values in the range 69-99 refer to
years in the twentieth century (1969 to 1999 inclusive), while
values in the range 00-68 refer to years in the twenty-first
century (2000 to 2068 inclusive). Essentially, for the "%y"
directive, strptime() became a "pivoting" function with 69
being a pivoting year.
Before this change, the strptime() function was always
interpreting a two-digit year with no century as a year
within the twentieth century.
With the current ECO kit, XPG5-compliant strptime() becomes
a default strptime() function in the DEC C RTL. However,
for compatibility reasons, the previous "non-pivoting"
XPG4-compliant strptime() function was retained.
The "pivoting" is controlled by the DECC$XPG4_STRPTIME logical
name. Defining this logical name prior to invoking the
application (any equivalence string) will cause the DEC C RTL
to use the "non-pivoting" flavor of strptime(). Also,
"non-pivoting" strptime() can be called directly as the
decc$strptime_xpg4() function.
While there is an easy way to disable "pivoting" by just
defining a logical name, you should be aware that if the
application ceases to work correctly due to the change in
the strptime() function, it almost certainly means that
there is a Y2K problem in the application. Y2K-safe
applications should not be affected by the change in strptime().
o The stat() function has been corrected to process file
specifications such as "foo:[000000]", where foo is defined
as a concealed device like the following:
$ define/trans=(conc) foo device:[bar.]
Prior to this fix, the stat() function would fail for such a
file specification with errno set to ENOENT (No such file or
directory).
o Both flavors of the system() function were corrected to ensure
that the function always returns the correct status.
The POSIX-compliant system() function has been corrected to
always return a status corresponding to the signal, which
terminated the child process if the child process was
terminated due to receiving a signal.
Prior to this fix, there was a small timing window when the
function could return the status corresponding to the child
process completion code, even in the case when the child
process was terminated by a signal.
The Non-POSIX system() function has been corrected to always
return the OpenVMS completion code of the child process.
Prior to this fix, there was a small timing window when the
function could return the status from LIB$SPAWN(), instead of
the completion code of the child process.
o The opendir() and readdir() functions have been corrected to
process directories on a remote node specified using the
following DECnet file specification:
nodename"username password"::device:[directory]
Prior to this fix, opendir() could fail with errno set to
ENOTDIR (Not a directory). In the case when opendir() could
successfully open the directory, the readdir() function could
return incorrect file names.
o The times() and clock() functions have been modified to be
both thread-safe and AST-reentrant.
Prior to this change, these functions belonged to the class of
functions which are thread safe, but not AST-reentrant (see
section 1.7.2 Multithread Restrictions in the DEC C RTL
Reference Manual).
The change in the reentrancy status of the times() and clock()
functions will be reflected in the next release of the Manual.
o The stat() function no longer fails due to the failure of the
mktime() function.
It was reported that the stat() function fails for a file
created on April 4th 1999 at 2:04 a.m. EST, which is the
"missing hour" in the transition from standard to daylight
saving time in the Eastern time zone.
The problem was due to the failure of the mktime() function to
process the "missing hour" (stat() calls mktime() to fill
st_?time members of the stat structure with the UTC time).
While the mktime() function was not fixed, the stat() function
was corrected to handle the failure of mktime() and set
st_?time fields correctly, even if mktime() fails.
Note, that, strictly speaking, "missing hour" is an invalid
input for mktime(): there is no such time as "April 4th 1999
2:04 a.m.", for example, in the Eastern time zone. Given the
possibility of calling mktime() with an invalid time, the
stat() function probably should not have used mktime() in the
first place or at least should have been prepared for an
mktime() failure.
o The select() function has been corrected to return a failure
status if either an invalid file descriptor or file descriptor
not associated with a socket is found in one of the specified
file descriptor sets. In the case of an invalid file
descriptor, the select() function sets errno to EBADF. In
case of a file descriptor not associated with a socket, the
function sets errno to ENOTSOCK.
Failure with errno set to EBADF is the standard requirement
for the select() function. Failure with errno set to ENOTSOCK
occurs because the select() function can currently operate
only on sockets.
Prior to this fix, the function was setting errno as described
above, but otherwise was ignoring invalid file descriptors and
file descriptors not associated with sockets.
The old behavior can be requested by defining the logical name
DECC$SELECT_IGNORES_INVALID_FD prior to invoking the
application (any equivalence string).
o The bug in the printf() "engine" introduced in the
ALPACRT07_071 kit has been fixed. The bug was that when
the minimal field width or precision specified in the
format directive was greater than 1024, the "engine"
could write beyond the end of allocated internal conversion
buffer. It could happen only in X_FLOAT floating point mode
(/L_DOUBLE_SIZE=128, which is the default on Alpha). The bug
affected all functions from the printf() family of functions.
o The problem commonly known as the "Y2038 bug" has been fixed.
The C run-time library time functions, which access the
current time using the OpenVMS time functions, have been
corrected to handle times after 19-Jan-2038 3:14:07. Data
type time_t is defined on OpenVMS as an unsigned 32-bit
integer. However, some of the functions which retrieve
current time from the system and convert it to time_t format
were using signed arithmetic.
This fix affects the functions:
o decc$fix_time()
o time()
o ftime()
o gettimeofday()
o getclock()
With this fix, DEC C RTL time functions will handle times
successfully until 07-Feb-2106 06:28:15.
o The printf() family of functions have been enhanced to perform
better when the calling application has exhausted available
memory.
o The file access functions have been corrected to process
file names on UNIX systems over DECnet. The file name for
a file on a UNIX system accessed over DECnet was being
converted to uppercase, even when the name was enclosed in
double quotes. This problem was introduced on OpenVMS V7.2
and also affects OpenVMS V7.1-2 and OpenVMS V7.2-1. File
names of the form node::"dir/name" are now processed correctly.
RELATED ARTICLES:
Detailed articles describing the problems listed above may exist in
the OPENVMS database. To view these articles, open the appropriate
product database and perform a query using either of the following
search strings: 'VMS712_ACRTL-V0200' or 'VMS712_ACRTL'.
ECO KIT ORDERING INSTRUCTIONS:
If after an evaluation you wish to obtain this kit, request it
electronically using the appropriate Advanced Electronic Services
(AES) Service Tool. If you are not familiar with how to request
kits electronically, open the DIA, WIS or DSNLINK database and
review the article entitled:
[AES] How To Electronically Request ECO Kits Using Service Tools
INSTALLATION NOTES:
Since the images in this kit will not take effect until the system
is rebooted, you must reboot the system after installing this kit.
If you have other nodes in your OpenVMS cluster, they must also be
rebooted in order to make use of the new image(s). If it is not
possible or convenient to reboot the entire cluster at this time, a
rolling re-boot may be performed.
During installation you may see the following message:
%INSTALL-E-NODELSHRADR, unable to delete image with shareable address
data
-INSTALL-I-PLSREBOOT, please reboot to install a new version of this
image
This is not a cause for concern. It simply means that DECC$SHR.EXE
was installed as a resident image, which is the standard
configuration for OpenVMS Alpha systems. The new image will not
take effect until the system is rebooted.
INSTALLATION INSTRUCTIONS:
Install this kit with the POLYCENTER Software Installation Utility
by logging into the SYSTEM account, and typing the following at the
DCL prompt:
PRODUCT INSTALL VMS712_ACRTL-V0200 /SOURCE=[kit location]
The kit location may be a tape drive, CD, or a disk directory that
contains the kit. If /SOURCE is not specified, the utility
searches in the location defined by the logical name PCSI$SOURCE.
If PCSI$SOURCE is not defined, and the /SOURCE qualifier is not
specified, the POLYCENTER Software Installation utility searches
the current default directory.
==========================================================================
| Table of Kit Image Information |
+----------------------------+----------+-----------------+--------------+
| | Overall | Image File | Image Link |
| Image Name | Checksum | Identification | Date/Time |
+----------------------------+----------+-----------------+--------------+
| DECC$SHR.EXE | E8EB9382 | V7.1-006 | 9-MAY-2001 |
| | | 17:06:33.76 |
+----------------------------+----------+-----------------+--------------+
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