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Sourcecode: postgresql-8.4 version File versions

bsdi.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) 1996-2009, PostgreSQL Global Development Group
 * Portions Copyright (c) 1994, Regents of the University of California
 *
 *
 * IDENTIFICATION
 *      $PostgreSQL: pgsql/src/backend/port/dynloader/bsdi.c,v 1.31 2009/01/01 17:23:46 momjian Exp $
 *
 *-------------------------------------------------------------------------
 */
#include "postgres.h"
#ifndef HAVE_DLOPEN

extern char my_exec_path[];

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);
}

char *
pg_dlerror()
{
      return dld_strerror(dld_errno);
}

#endif   /* not HAVE_DLOPEN */

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