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glibc, at least, is capable of returning "???" instead of anything useful
if it doesn't like the setting of LC_CTYPE. If this happens, or in the
previously-known case of strerror() returning an empty string, try to
print the C macro name for the error code ("EACCES" etc). Only if we
don't have the error code in our compiled-in list of popular error codes
(which covers most though not quite all of what's called out in the POSIX
spec) will we fall back to printing a numeric error code. This should
simplify debugging.
Note that this functionality is currently only provided for %m in backend
ereport/elog messages. That may be sufficient, since we don't fool with the
locale environment in frontend clients, but it's foreseeable that we might
want similar code in libpq for instance.
There was some talk of back-patching this, but let's see how the buildfarm
likes it first. It seems likely that at least some of the POSIX-defined
error code symbols don't exist on all platforms. I don't want to clutter
the entire list with #ifdefs, but we may need more than are here now.
MauMau, edited by me
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| README.git | ||
PostgreSQL Database Management System ===================================== This directory contains the source code distribution of the PostgreSQL database management system. PostgreSQL is an advanced object-relational database management system that supports an extended subset of the SQL standard, including transactions, foreign keys, subqueries, triggers, user-defined types and functions. This distribution also contains C language bindings. PostgreSQL has many language interfaces, many of which are listed here: http://www.postgresql.org/download See the file INSTALL for instructions on how to build and install PostgreSQL. That file also lists supported operating systems and hardware platforms and contains information regarding any other software packages that are required to build or run the PostgreSQL system. Changes between all PostgreSQL releases are recorded in the file HISTORY. Copyright and license information can be found in the file COPYRIGHT. A comprehensive documentation set is included in this distribution; it can be read as described in the installation instructions. The latest version of this software may be obtained at http://www.postgresql.org/download/. For more information look at our web site located at http://www.postgresql.org/.