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Add server support for "plugin" libraries that can be used for add-on tasks

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such as debugging and performance measurement.  This consists of two features:
a table of "rendezvous variables" that allows separately-loaded shared
libraries to communicate, and a new GUC setting "local_preload_libraries"
that allows libraries to be loaded into specific sessions without explicit
cooperation from the client application.  To make local_preload_libraries
as flexible as possible, we do not restrict its use to superusers; instead,
it is restricted to load only libraries stored in $libdir/plugins/.  The
existing LOAD command has also been modified to allow non-superusers to
LOAD libraries stored in this directory.

This patch also renames the existing GUC variable preload_libraries to
shared_preload_libraries (after a suggestion by Simon Riggs) and does some
code refactoring in dfmgr.c to improve clarity.

Korry Douglas, with a little help from Tom Lane.
This commit is contained in:
Tom Lane
2006-08-15 18:26:59 +00:00
parent 66541c5aa5
commit abc3120e9b
11 changed files with 353 additions and 113 deletions
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5
src/include/fmgr.h
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@@ -11,7 +11,7 @@
* Portions Copyright (c) 1996-2006, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/fmgr.h,v 1.45 2006/05/31 20:58:09 tgl Exp $
* $PostgreSQL: pgsql/src/include/fmgr.h,v 1.46 2006/08/15 18:26:59 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -488,7 +488,8 @@ extern char *Dynamic_library_path;
extern PGFunction load_external_function(char *filename, char *funcname,
bool signalNotFound, void **filehandle);
extern PGFunction lookup_external_function(void *filehandle, char *funcname);
extern void load_file(char *filename);
extern void load_file(const char *filename, bool restrict);
extern void **find_rendezvous_variable(const char *varName);
/*