/*

 * Copyright (c) 2012, 2013 SAP SE. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 *

 */

#include <stdio.h>

#include <sys/ldr.h>

#include <errno.h>

#include "porting_aix.h"

static unsigned char dladdr_buffer[0x4000];

static void fill_dll_info(void) {

  int rc = loadquery(L_GETINFO,dladdr_buffer, sizeof(dladdr_buffer));

  if (rc == -1) {

    fprintf(stderr, "loadquery failed (%d %s)", errno, strerror(errno));

    fflush(stderr);

  }

}

static int dladdr_dont_reload(void* addr, Dl_info* info) {

  const struct ld_info* p = (struct ld_info*) dladdr_buffer;

  info->dli_fbase = 0; info->dli_fname = 0;

  info->dli_sname = 0; info->dli_saddr = 0;

  for (;;) {

    if (addr >= p->ldinfo_textorg &&

        addr < (((char*)p->ldinfo_textorg) + p->ldinfo_textsize)) {

      info->dli_fname = p->ldinfo_filename;

      info->dli_fbase = p->ldinfo_textorg;

      return 1; /* [sic] */

    }

    if (!p->ldinfo_next) {

      break;

    }

    p = (struct ld_info*)(((char*)p) + p->ldinfo_next);

  }

  return 0; /* [sic] */

}

#ifdef __cplusplus

extern "C"

#endif

int dladdr(void *addr, Dl_info *info) {

  static int loaded = 0;

  if (!loaded) {

    fill_dll_info();

    loaded = 1;

  }

  if (!addr) {

    return 0;  /* [sic] */

  }

  /* Address could be AIX function descriptor? */

  void* const addr0 = *( (void**) addr );

  int rc = dladdr_dont_reload(addr, info);

  if (rc == 0) {

    rc = dladdr_dont_reload(addr0, info);

    if (rc == 0) { /* [sic] */

      fill_dll_info(); /* refill, maybe loadquery info is outdated */

      rc = dladdr_dont_reload(addr, info);

      if (rc == 0) {

        rc = dladdr_dont_reload(addr0, info);

      }

    }

  }

  return rc;

}