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102 lines
2.1 KiB
C
102 lines
2.1 KiB
C
/*-------------------------------------------------------------------------
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*
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* dynloader.c--
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* Dynamic Loader for Postgres for DG/UX, generated from those for
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* Linux.
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*
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* Copyright (c) 1994, Regents of the University of California
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*
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*
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* IDENTIFICATION
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* $Header: /cvsroot/pgsql/src/backend/port/dynloader/dgux.c,v 1.1 1997/12/20 04:48:02 scrappy Exp $
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*
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*-------------------------------------------------------------------------
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*/
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#include <stdio.h>
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#include <dld.h>
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#include "postgres.h"
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#include "port-protos.h"
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#include "utils/elog.h"
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#include "fmgr.h"
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extern char pg_pathname[];
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void *
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pg_dlopen(char *filename)
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{
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static int dl_initialized = 0;
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/*
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* initializes the dynamic loader with the executable's pathname.
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* (only needs to do this the first time pg_dlopen is called.)
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*/
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if (!dl_initialized)
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{
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if (dld_init(dld_find_executable(pg_pathname)))
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{
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return NULL;
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}
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/*
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* if there are undefined symbols, we want dl to search from the
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* following libraries also.
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*/
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dl_initialized = 1;
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}
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/*
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* link the file, then check for undefined symbols!
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*/
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if (dld_link(filename))
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{
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return NULL;
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}
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/*
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* If undefined symbols: try to link with the C and math libraries!
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* This could be smarter, if the dynamic linker was able to handle
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* shared libs!
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*/
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if (dld_undefined_sym_count > 0)
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{
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if (dld_link("/usr/lib/libc.a"))
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{
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elog(NOTICE, "dld: Cannot link C library!");
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return NULL;
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}
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if (dld_undefined_sym_count > 0)
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{
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if (dld_link("/usr/lib/libm.a"))
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{
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elog(NOTICE, "dld: Cannot link math library!");
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return NULL;
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}
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if (dld_undefined_sym_count > 0)
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{
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int count = dld_undefined_sym_count;
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char **list = dld_list_undefined_sym();
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/* list the undefined symbols, if any */
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elog(NOTICE, "dld: Undefined:");
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do
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{
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elog(NOTICE, " %s", *list);
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list++;
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count--;
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} while (count > 0);
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dld_unlink_by_file(filename, 1);
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return NULL;
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}
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}
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}
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return (void *) strdup(filename);
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}
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char *
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pg_dlerror()
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{
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return dld_strerror(dld_errno);
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}
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