1 /* Copyright (C) 1991-2022 Free Software Foundation, Inc. 2 This file is part of the GNU C Library. 3 4 The GNU C Library is free software; you can redistribute it and/or 5 modify it under the terms of the GNU Lesser General Public 6 License as published by the Free Software Foundation; either 7 version 2.1 of the License, or (at your option) any later version. 8 9 The GNU C Library is distributed in the hope that it will be useful, 10 but WITHOUT ANY WARRANTY; without even the implied warranty of 11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 12 Lesser General Public License for more details. 13 14 You should have received a copy of the GNU Lesser General Public 15 License along with the GNU C Library; if not, see 16 <https://www.gnu.org/licenses/>. */ 17 18 #include <assert.h> 19 #include <stdlib.h> 20 #include "exit.h" 21 #include <sysdep.h> 22 23 /* Register a function to be called by exit. */ 24 int __on_exit(void (* func)(int status,void * arg),void * arg)25__on_exit (void (*func) (int status, void *arg), void *arg) 26 { 27 struct exit_function *new; 28 29 /* As a QoI issue we detect NULL early with an assertion instead 30 of a SIGSEGV at program exit when the handler is run (bug 20544). */ 31 assert (func != NULL); 32 33 __libc_lock_lock (__exit_funcs_lock); 34 new = __new_exitfn (&__exit_funcs); 35 36 if (new == NULL) 37 { 38 __libc_lock_unlock (__exit_funcs_lock); 39 return -1; 40 } 41 42 #ifdef PTR_MANGLE 43 PTR_MANGLE (func); 44 #endif 45 new->func.on.fn = func; 46 new->func.on.arg = arg; 47 new->flavor = ef_on; 48 __libc_lock_unlock (__exit_funcs_lock); 49 return 0; 50 } 51 weak_alias (__on_exit, on_exit) 52