void
pg_dlclose(void *handle)
{
#ifndef HAVE_DLD_H
#else
dld_unlink_by_file(handle, 1);
free(handle);
#endif
}
/* A function called through the vtable when a particular module
should be unloaded. */
static int
vm_close (lt_user_data loader_data LT__UNUSED, lt_module module)
{
int errors = 0;
if (dld_unlink_by_file ((char*)(module), 1) != 0)
{
LT__SETERROR (CANNOT_CLOSE);
++errors;
}
else
{
FREE (module);
}
return errors;
}
void *
pg_dlopen(char *filename)
{
static int dl_initialized = 0;
/*
* initializes the dynamic loader with the executable's pathname. (only
* needs to do this the first time pg_dlopen is called.)
*/
if (!dl_initialized)
{
if (dld_init(dld_find_executable(my_exec_path)))
return NULL;
/*
* if there are undefined symbols, we want dl to search from the
* following libraries also.
*/
dl_initialized = 1;
}
/*
* link the file, then check for undefined symbols!
*/
if (dld_link(filename))
return NULL;
/*
* If undefined symbols: try to link with the C and math libraries! This
* could be smarter, if the dynamic linker was able to handle shared libs!
*/
if (dld_undefined_sym_count > 0)
{
if (dld_link("/usr/lib/libc.a"))
{
elog(WARNING, "could not link C library");
return NULL;
}
if (dld_undefined_sym_count > 0)
{
if (dld_link("/usr/lib/libm.a"))
{
elog(WARNING, "could not link math library");
return NULL;
}
if (dld_undefined_sym_count > 0)
{
int count = dld_undefined_sym_count;
char **list = dld_list_undefined_sym();
/* list the undefined symbols, if any */
do
{
elog(WARNING, "\"%s\" is undefined", *list);
list++;
count--;
} while (count > 0);
dld_unlink_by_file(filename, 1);
return NULL;
}
}
}
return (void *) strdup(filename);
}
static void *dlclose(void *module)
{
if(!module) return;
dld_unlink_by_file((char *)module);
free(module);
}
