Обсуждение: Embedded SQL library bug

============================================================================
                        POSTGRESQL BUG REPORT TEMPLATE
============================================================================


Your name        :    David Flater
Your email address    :       dflater@nist.gov


System Configuration
---------------------
  Architecture (example: Intel Pentium)      :  Sun Ultrasparc 60

  Operating System (example: Linux 2.4.18)     :  SunOS 5.8

  PostgreSQL version (example: PostgreSQL-7.4.2):   PostgreSQL-7.4.2

  Compiler used (example:  gcc 2.95.2)        :  gcc 3.2


Please enter a FULL description of your problem:
------------------------------------------------

In Embedded SQL, sometimes get segmentation faults on selecting part
or all of a float8[] array into a char array.

(gdb) where
#0  0xff233da0 in strncpy () from /usr/lib/libc.so.1
#1  0xff376780 in ECPGget_data () from /private/pgsql/lib/libecpg.so.4
#2  0xff37345c in ECPGstore_result () from /private/pgsql/lib/libecpg.so.4
#3  0xff374cc8 in ECPGexecute () from /private/pgsql/lib/libecpg.so.4
#4  0xff3751dc in ECPGdo () from /private/pgsql/lib/libecpg.so.4
#5  0x00010a58 in main (argc=1, argv=0xffbef384) at crashme.pgc:45

The attached example reproduces the failure on PostgreSQL 7.4.2 under
Solaris.  The problem was also experienced by a colleague who was
using Linux but I haven't tested the example under Linux.



Please describe a way to repeat the problem.   Please try to provide a
concise reproducible example, if at all possible:
----------------------------------------------------------------------

I have attached a tar file containing a program, makefile, and log of
my results.

Do this:

createdb crashme
make
./crashme




If you know how this problem might be fixed, list the solution below:
---------------------------------------------------------------------

N/A

--
David Flater, National Institute of Standards and Technology, U.S.A.

On Fri, May 21, 2004 at 05:03:40PM -0400, David Flater wrote:
> In Embedded SQL, sometimes get segmentation faults on selecting part
> or all of a float8[] array into a char array.

Thanks for the report. The problem is that ecpg does not know that it
gets an array of floats but expects a character string since the
variable is char[]. Seeing that it gets more than one value it tries to
bulk load the data into an array of strings which obviously doesn't
exist.

I will have to see what solution is best for this.

Michael

--
Michael Meskes
Email: Michael at Fam-Meskes dot De
ICQ: 179140304, AIM/Yahoo: michaelmeskes, Jabber: meskes@jabber.org
Go SF 49ers! Go Rhein Fire! Use Debian GNU/Linux! Use PostgreSQL!

On Fri, May 21, 2004 at 05:03:40PM -0400, David Flater wrote:
> In Embedded SQL, sometimes get segmentation faults on selecting part
> or all of a float8[] array into a char array.

I just committed a patch to cvs HEAD that should fix your problem.
Please try it and tell me if it works correctly.

Michael
--
Michael Meskes
Email: Michael at Fam-Meskes dot De
ICQ: 179140304, AIM/Yahoo: michaelmeskes, Jabber: meskes@jabber.org
Go SF 49ers! Go Rhein Fire! Use Debian GNU/Linux! Use PostgreSQL!