diff options
Diffstat (limited to 'doc/src')
| -rw-r--r-- | doc/src/sgml/pltcl.sgml | 22 |
1 files changed, 14 insertions, 8 deletions
diff --git a/doc/src/sgml/pltcl.sgml b/doc/src/sgml/pltcl.sgml index b5f286bd1e5..d72e275ae77 100644 --- a/doc/src/sgml/pltcl.sgml +++ b/doc/src/sgml/pltcl.sgml @@ -1,5 +1,5 @@ <!-- -$Header: /cvsroot/pgsql/doc/src/sgml/pltcl.sgml,v 2.26.2.2 2004/01/24 23:06:41 tgl Exp $ +$Header: /cvsroot/pgsql/doc/src/sgml/pltcl.sgml,v 2.26.2.3 2010/05/13 18:29:54 tgl Exp $ --> <chapter id="pltcl"> @@ -646,11 +646,13 @@ CREATE TRIGGER trig_mytab_modcount BEFORE INSERT OR UPDATE ON mytab It recognizes a special table, <literal>pltcl_modules</>, which is presumed to contain modules of Tcl code. If this table exists, the module <literal>unknown</> is fetched from the table - and loaded into the Tcl interpreter immediately after creating - the interpreter. + and loaded into the Tcl interpreter immediately before the first + execution of a PL/Tcl function in a database session. (This + happens separately for PL/Tcl and PL/TclU, if both are used, + because separate interpreters are used for the two languages.) </para> <para> - While the <literal>unknown</> module could actually contain any + While the <literal>unknown</> module could actually contain any initialization script you need, it normally defines a Tcl <function>unknown</> procedure that is invoked whenever Tcl does not recognize an invoked procedure name. <application>PL/Tcl</>'s standard version @@ -663,18 +665,22 @@ CREATE TRIGGER trig_mytab_modcount BEFORE INSERT OR UPDATE ON mytab is reasonably quick. </para> <para> - The <productname>PostgreSQL</productname> distribution includes + The <productname>PostgreSQL</productname> distribution includes support scripts to maintain these tables: <command>pltcl_loadmod</>, <command>pltcl_listmod</>, <command>pltcl_delmod</>, as well as source for the standard - <literal>unknown</> module in <filename>share/unknown.pltcl</>. This module + <literal>unknown</> module in <filename>share/unknown.pltcl</>. This module must be loaded into each database initially to support the autoloading mechanism. </para> <para> - The tables <literal>pltcl_modules</> and <literal>pltcl_modfuncs</> + The tables <literal>pltcl_modules</> and <literal>pltcl_modfuncs</> must be readable by all, but it is wise to make them owned and - writable only by the database administrator. + writable only by the database administrator. As a security + precaution, PL/Tcl will ignore <literal>pltcl_modules</> (and thus, + not attempt to load the <literal>unknown</> module) unless it is + owned by a superuser. But update privileges on this table can be + granted to other users, if you trust them sufficiently. </para> </sect1> |