99 lines
2.1 KiB
C
99 lines
2.1 KiB
C
/*-------------------------------------------------------------------------
|
|
*
|
|
* dynloader.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) 1996-2000, PostgreSQL, Inc
|
|
* Portions Copyright (c) 1994, Regents of the University of California
|
|
*
|
|
*
|
|
* IDENTIFICATION
|
|
* /usr/local/devel/pglite/cvs/src/backend/port/linux/dynloader.c,v 1.1.1.1 1994/11/07 05:19:37 andrew Exp
|
|
*
|
|
*-------------------------------------------------------------------------
|
|
*/
|
|
#ifdef PRE_BSDI_2_1
|
|
#include "postgres.h"
|
|
|
|
extern char pg_pathname[];
|
|
|
|
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(pg_pathname)))
|
|
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(NOTICE, "dld: Cannot link C library!");
|
|
return NULL;
|
|
}
|
|
if (dld_undefined_sym_count > 0)
|
|
{
|
|
if (dld_link("/usr/lib/libm.a"))
|
|
{
|
|
elog(NOTICE, "dld: Cannot 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 */
|
|
elog(NOTICE, "dld: Undefined:");
|
|
do
|
|
{
|
|
elog(NOTICE, " %s", *list);
|
|
list++;
|
|
count--;
|
|
} while (count > 0);
|
|
|
|
dld_unlink_by_file(filename, 1);
|
|
return NULL;
|
|
}
|
|
}
|
|
}
|
|
|
|
return (void *) strdup(filename);
|
|
}
|
|
|
|
char *
|
|
pg_dlerror()
|
|
{
|
|
return dld_strerror(dld_errno);
|
|
}
|
|
|
|
#endif
|