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/*-------------------------------------------------------------------------
*
* linux.c
* Dynamic Loader for Postgres for Linux, generated from those for
* Ultrix.
*
* You need to install the dld library on your Linux system!
*
* Portions Copyright (c) 1996-2005, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/port/dynloader/linux.c,v 1.30 2004-12-31 22:00:32 pgsql Exp $
*
*-------------------------------------------------------------------------
*/
#include "postgres.h"
#ifdef HAVE_DLD_H
#include <dld.h>
#endif
#include "dynloader.h"
#include "miscadmin.h"
#ifndef HAVE_DLOPEN
void *
pg_dlopen(char *filename)
{
#ifndef HAVE_DLD_H
elog(ERROR, "dynamic load not supported");
return NULL;
#else
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);
#endif
}
PGFunction
pg_dlsym(void *handle, char *funcname)
{
#ifndef HAVE_DLD_H
return NULL;
#else
return (PGFunction) dld_get_func((funcname));
#endif
}
void
pg_dlclose(void *handle)
{
#ifndef HAVE_DLD_H
#else
dld_unlink_by_file(handle, 1);
free(handle);
#endif
}
char *
pg_dlerror(void)
{
#ifndef HAVE_DLD_H
return "dynaloader unspported";
#else
return dld_strerror(dld_errno);
#endif
}
#endif /* !HAVE_DLOPEN */
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