1 /* $OpenBSD: thread_atexit.c,v 1.1 2017/12/16 20:06:56 guenther Exp $ */ 2 /* 3 * Copyright (c) 2017 Mark Kettenis <kettenis@openbsd.org> 4 * 5 * Permission to use, copy, modify, and distribute this software for any 6 * purpose with or without fee is hereby granted, provided that the above 7 * copyright notice and this permission notice appear in all copies. 8 * 9 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 10 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 11 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 12 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 13 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 14 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 15 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 16 */ 17 18 #include <dlfcn.h> 19 #include <elf.h> 20 #pragma weak _DYNAMIC 21 #include <stdlib.h> 22 #include <tib.h> 23 24 #include "atexit.h" 25 26 typeof(dlctl) dlctl asm("_dlctl") __attribute__((weak)); 27 28 __weak_alias(__cxa_thread_atexit, __cxa_thread_atexit_impl); 29 30 int 31 __cxa_thread_atexit_impl(void (*func)(void *), void *arg, void *dso) 32 { 33 struct thread_atexit_fn *fnp; 34 struct tib *tib = TIB_GET(); 35 36 fnp = calloc(1, sizeof(struct thread_atexit_fn)); 37 if (fnp == NULL) 38 return -1; 39 40 if (_DYNAMIC) 41 dlctl(NULL, DL_REFERENCE, dso); 42 43 fnp->func = func; 44 fnp->arg = arg; 45 fnp->next = tib->tib_atexit; 46 tib->tib_atexit = fnp; 47 48 return 0; 49 } 50