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Sourcecode: postgresql-8.4 version File versions

ultrix4.c

/*-------------------------------------------------------------------------
 *
 * ultrix4.c
 *      This dynamic loader uses Andrew Yu's libdl-1.0 package for Ultrix 4.x.
 *
 * Portions Copyright (c) 1996-2009, PostgreSQL Global Development Group
 * Portions Copyright (c) 1994, Regents of the University of California
 *
 *
 * IDENTIFICATION
 *      $PostgreSQL$
 *
 *-------------------------------------------------------------------------
 */
#include "postgres.h"

#include "dl.h"
#include "utils/dynamic_loader.h"

extern char my_exec_path[];

void *
pg_dlopen(char *filename)
{
      static int  dl_initialized = 0;
      void     *handle;

      /*
       * 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 (!dl_init(my_exec_path))
                  return NULL;

            /*
             * if there are undefined symbols, we want dl to search from the
             * following libraries also.
             */
            dl_setLibraries("/usr/lib/libm_G0.a:/usr/lib/libc_G0.a");
            dl_initialized = 1;
      }

      /*
       * open the file. We do the symbol resolution right away so that we will
       * know if there are undefined symbols. (This is in fact the same
       * semantics as "ld -A". ie. you cannot have undefined symbols.
       */
      if ((handle = dl_open(filename, DL_NOW)) == NULL)
      {
            int               count;
            char    **list = dl_undefinedSymbols(&count);

            /* list the undefined symbols, if any */
            if (count)
            {
                  while (*list)
                  {
                        elog(WARNING, "\"%s\" is undefined", *list);
                        list++;
                  }
            }
      }

      return (void *) handle;
}

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