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Viewing changes to src/backend/port/dynloader/ultrix4.c

  • Committer: alvherre
  • Date: 2005-12-16 21:24:52 UTC
  • Revision ID: svn-v4:db760fc0-0f08-0410-9d63-cc6633f64896:trunk:1
Initial import of the REL8_0_3 sources from the Pgsql CVS repository.

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src/backend/port/dynloader/ultrix4.c
 
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/*-------------------------------------------------------------------------
 
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 *
 
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 * ultrix4.c
 
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 *        This dynamic loader uses Andrew Yu's libdl-1.0 package for Ultrix 4.x.
 
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 *
 
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 * Portions Copyright (c) 1996-2005, PostgreSQL Global Development Group
 
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 * Portions 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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 *        $PostgreSQL: pgsql/src/backend/port/dynloader/ultrix4.c,v 1.22 2004-12-31 22:00:32 pgsql Exp $
 
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 *
 
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 *-------------------------------------------------------------------------
 
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 */
 
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#include "postgres.h"
 
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#include "dl.h"
 
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#include "utils/dynamic_loader.h"
 
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extern char my_exec_path[];
 
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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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        void       *handle;
 
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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 (!dl_init(my_exec_path))
 
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                        return NULL;
 
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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_setLibraries("/usr/lib/libm_G0.a:/usr/lib/libc_G0.a");
 
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                dl_initialized = 1;
 
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        }
 
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        /*
 
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         * open the file. We do the symbol resolution right away so that we
 
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         * will know if there are undefined symbols. (This is in fact the same
 
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         * semantics as "ld -A". ie. you cannot have undefined symbols.
 
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         */
 
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        if ((handle = dl_open(filename, DL_NOW)) == NULL)
 
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        {
 
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                int                     count;
 
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                char      **list = dl_undefinedSymbols(&count);
 
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                /* list the undefined symbols, if any */
 
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                if (count)
 
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                {
 
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                        while (*list)
 
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                        {
 
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                                elog(WARNING, "\"%s\" is undefined", *list);
 
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                                list++;
 
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                        }
 
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                }
 
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        }
 
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        return (void *) handle;
 
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}