IABSD.fr/src/lib/libc/stdlib/thread_atexit.c

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• Author : guenther
  Date : 2019-06-02 01:03:01
  Hash : 5c7d06e5
  Message : Complete the ld.so boot cleanup: move most libc initialization from _csu_finish() to _libc_preinit(), which is an .init_array function in shared libc (and mark it INITFIRST) or a .preinit_array function in static libc, grabbing the _dl_cb callback there from ld.so. Then in _csu_finish(), invoke the dl_clean_boot() callback to free ld.so's startup bits before main() gets control. Other cleanups this permits: - move various startup structures into .data.rel.ro - the dl* stubs in libc can be strong and call the callbacks provided via _dl_cb - no longer need to conditionalize dlctl() calls on presence of _DYNAMIC original concept and full diff ok kettenis@ ok deraadt@

• lib/libc/stdlib/thread_atexit.c

• /*	$OpenBSD: thread_atexit.c,v 1.2 2019/06/02 01:03:01 guenther Exp $ */
  /*
   * Copyright (c) 2017 Mark Kettenis <kettenis@openbsd.org>
   *
   * Permission to use, copy, modify, and distribute this software for any
   * purpose with or without fee is hereby granted, provided that the above
   * copyright notice and this permission notice appear in all copies.
   *
   * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
   * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
   * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
   * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
   * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
   * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
   * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
   */
  
  #include <dlfcn.h>
  #include <stdlib.h>
  #include <tib.h>
  
  #include "atexit.h"
  
  __weak_alias(__cxa_thread_atexit, __cxa_thread_atexit_impl);
  
  int
  __cxa_thread_atexit_impl(void (*func)(void *), void *arg, void *dso)
  {
  	struct thread_atexit_fn *fnp;
  	struct tib *tib = TIB_GET();
  
  	fnp = calloc(1, sizeof(struct thread_atexit_fn));
  	if (fnp == NULL)
  		return -1;
  
  	dlctl(NULL, DL_REFERENCE, dso);
  
  	fnp->func = func;
  	fnp->arg = arg;
  	fnp->next = tib->tib_atexit;
  	tib->tib_atexit = fnp;
  
  	return 0;
  }