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Add a feature for automatic initialization and finalization of dynamically

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loaded libraries: call functions _PG_init() and _PG_fini() if the library
defines such symbols.  Hence we no longer need to specify an initialization
function in preload_libraries: we can assume that the library used the
_PG_init() convention, instead.  This removes one source of pilot error
in use of preloaded libraries.  Original patch by Ralf Engelschall,
preload_libraries changes by me.
This commit is contained in:
Tom Lane
2006-08-08 19:15:09 +00:00
parent e00664da48
commit b09bfcaa57
12 changed files with 179 additions and 239 deletions
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60
src/backend/utils/init/miscinit.c
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@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/utils/init/miscinit.c,v 1.155 2006/07/14 14:52:25 momjian Exp $
* $PostgreSQL: pgsql/src/backend/utils/init/miscinit.c,v 1.156 2006/08/08 19:15:08 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -1097,14 +1097,14 @@ ValidatePgVersion(const char *path)
*-------------------------------------------------------------------------
*/
typedef void (*func_ptr) ();
/* GUC variable: list of library names to be preloaded */
char *preload_libraries_string = NULL;
/*
* process any libraries that should be preloaded and
* optionally pre-initialized
* process any libraries that should be preloaded at postmaster start
*/
void
process_preload_libraries(char *preload_libraries_string)
process_preload_libraries(void)
{
char *rawstring;
List *elemlist;
@ -1131,54 +1131,14 @@ process_preload_libraries(char *preload_libraries_string)
foreach(l, elemlist)
{
char *tok = (char *) lfirst(l);
char *sep = strstr(tok, ":");
char *filename = NULL;
char *funcname = NULL;
func_ptr initfunc;
if (sep)
{
/*
* a colon separator implies there is an initialization function
* that we need to run in addition to loading the library
*/
size_t filename_len = sep - tok;
size_t funcname_len = strlen(tok) - filename_len - 1;
filename = (char *) palloc(filename_len + 1);
memcpy(filename, tok, filename_len);
filename[filename_len] = '\0';
funcname = (char *) palloc(funcname_len + 1);
strcpy(funcname, sep + 1);
}
else
{
/*
* no separator -- just load the library
*/
filename = pstrdup(tok);
funcname = NULL;
}
char *filename;
filename = pstrdup(tok);
canonicalize_path(filename);
initfunc = (func_ptr) load_external_function(filename, funcname,
true, NULL);
if (initfunc)
(*initfunc) ();
if (funcname)
ereport(LOG,
(errmsg("preloaded library \"%s\" with initialization function \"%s\"",
filename, funcname)));
else
ereport(LOG,
(errmsg("preloaded library \"%s\"",
filename)));
(void) load_external_function(filename, NULL, true, NULL);
ereport(LOG,
(errmsg("preloaded library \"%s\"", filename)));
pfree(filename);
if (funcname)
pfree(funcname);
}
pfree(rawstring);