From 28f540f45bbacd939bfd07f213bcad2bf730b1bf Mon Sep 17 00:00:00 2001 From: Roland McGrath Date: Sat, 18 Feb 1995 01:27:10 +0000 Subject: initial import --- stdlib/atexit.c | 65 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 65 insertions(+) create mode 100644 stdlib/atexit.c (limited to 'stdlib/atexit.c') diff --git a/stdlib/atexit.c b/stdlib/atexit.c new file mode 100644 index 0000000000..a2ab453576 --- /dev/null +++ b/stdlib/atexit.c @@ -0,0 +1,65 @@ +/* Copyright (C) 1991 Free Software Foundation, Inc. +This file is part of the GNU C Library. + +The GNU C Library is free software; you can redistribute it and/or +modify it under the terms of the GNU Library General Public License as +published by the Free Software Foundation; either version 2 of the +License, or (at your option) any later version. + +The GNU C Library 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 +Library General Public License for more details. + +You should have received a copy of the GNU Library General Public +License along with the GNU C Library; see the file COPYING.LIB. If +not, write to the Free Software Foundation, Inc., 675 Mass Ave, +Cambridge, MA 02139, USA. */ + +#include +#include +#include "exit.h" + + +/* Register FUNC to be executed by `exit'. */ +int +DEFUN(atexit, (func), void EXFUN((*func), (NOARGS))) +{ + struct exit_function *new = __new_exitfn(); + + if (new == NULL) + return -1; + + new->flavor = ef_at; + new->func.at = func; + return 0; +} + + +static struct exit_function_list fnlist = { NULL, 0, }; +struct exit_function_list *__exit_funcs = &fnlist; + +struct exit_function * +DEFUN_VOID(__new_exitfn) +{ + register struct exit_function_list *l; + + for (l = __exit_funcs; l != NULL; l = l->next) + { + register size_t i; + for (i = 0; i < l->idx; ++i) + if (l->fns[i].flavor == ef_free) + return &l->fns[i]; + if (l->idx < sizeof(l->fns) / sizeof(l->fns[0])) + return &l->fns[l->idx++]; + } + + l = (struct exit_function_list *) malloc(sizeof(struct exit_function_list)); + if (l == NULL) + return NULL; + l->next = __exit_funcs; + __exit_funcs = l; + + l->idx = 1; + return &l->fns[0]; +} -- cgit v1.2.3