/* 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, see <http://www.gnu.org/licenses/>. */ /* Hacked up for uClibc by Erik Andersen */ #include <features.h> #include <stdio.h> #include <stdlib.h> #include <string.h> #include <unistd.h> #include <signal.h> #include <errno.h> /* Defeat compiler optimization which assumes function addresses are never NULL */ static __always_inline int not_null_ptr(const void *p) { const void *q; __asm__ ("" : "=r" (q) /* output */ : "0" (p) /* input */ ); return q != 0; } /* Our last ditch effort to commit suicide */ #ifdef __UCLIBC_ABORT_INSTRUCTION__ # define ABORT_INSTRUCTION __asm__(__UCLIBC_ABORT_INSTRUCTION__) #else # define ABORT_INSTRUCTION # warning "no abort instruction defined for your arch" #endif static smallint been_there_done_that = 0; /* Be prepared in case multiple threads try to abort() */ #include <bits/uClibc_mutex.h> __UCLIBC_MUTEX_STATIC(mylock, PTHREAD_RECURSIVE_MUTEX_INITIALIZER_NP); /* Cause an abnormal program termination with core-dump */ void abort(void) { sigset_t sigs; /* Make sure we acquire the lock before proceeding */ __UCLIBC_MUTEX_LOCK_CANCEL_UNSAFE(mylock); /* Unmask SIGABRT to be sure we can get it */ __sigemptyset(&sigs); __sigaddset(&sigs, SIGABRT); sigprocmask(SIG_UNBLOCK, &sigs, NULL); while (1) { /* Try to suicide with a SIGABRT */ if (been_there_done_that == 0) { been_there_done_that++; #ifdef __UCLIBC_HAS_STDIO_SHUTDOWN_ON_ABORT__ /* If we are using stdio, try to shut it down. At the very least, * this will attempt to commit all buffered writes. It may also * unbuffer all writable files, or close them outright. * Check the stdio routines for details. */ if (not_null_ptr(_stdio_term)) { _stdio_term(); } #endif abort_it: __UCLIBC_MUTEX_UNLOCK_CANCEL_UNSAFE(mylock); raise(SIGABRT); __UCLIBC_MUTEX_LOCK_CANCEL_UNSAFE(mylock); } /* Still here? Try to remove any signal handlers */ if (been_there_done_that == 1) { struct sigaction act; been_there_done_that++; memset(&act, '\0', sizeof(struct sigaction)); if (SIG_DFL) /* if it's constant zero, already done */ act.sa_handler = SIG_DFL; __sigfillset(&act.sa_mask); sigaction(SIGABRT, &act, NULL); goto abort_it; } /* Still here? Try to suicide with an illegal instruction */ if (been_there_done_that == 2) { been_there_done_that++; ABORT_INSTRUCTION; } /* Still here? Try to at least exit */ if (been_there_done_that == 3) { been_there_done_that++; _exit(127); } /* Still here? We're screwed. Sleepy time. Good night. */ while (1) /* Try for ever and ever */ ABORT_INSTRUCTION; } } libc_hidden_def(abort)