df1d7dd480
Remove calls to the userspace API exit() from the kernel. The problem with doing such calls is that the exit functions are called with kernel mode privileges which is a big security no-no.
155 lines
4.9 KiB
C
155 lines
4.9 KiB
C
/****************************************************************************
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* libs/libc/stdlib/lib_exit.c
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <nuttx/atexit.h>
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#include <nuttx/compiler.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#ifndef __KERNEL__
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/****************************************************************************
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* Private Data
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****************************************************************************/
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/****************************************************************************
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* Public Data
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****************************************************************************/
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extern FAR void *__dso_handle weak_data;
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FAR void *__dso_handle = &__dso_handle;
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: exit
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*
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* Description:
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* The exit() function causes normal process termination and the
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* least significant byte of status (i.e., status & 0xFF) is
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* returned to the parent (see wait(2)).
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*
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* All functions registered with atexit(3) and on_exit(3) are
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* called, in the reverse order of their registration. (It is
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* possible for one of these functions to use atexit(3) or
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* on_exit(3) to register an additional function to be executed
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* during exit processing; the new registration is added to the
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* front of the list of functions that remain to be called.) If one
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* of these functions does not return (e.g., it calls _exit(2), or
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* kills itself with a signal), then none of the remaining functions
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* is called, and further exit processing (in particular, flushing
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* of stdio(3) streams) is abandoned. If a function has been
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* registered multiple times using atexit(3) or on_exit(3), then it
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* is called as many times as it was registered.
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*
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* All open stdio(3) streams are flushed and closed. Files created
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* by tmpfile(3) are removed.
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*
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* The C standard specifies two constants, EXIT_SUCCESS and
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* EXIT_FAILURE, that may be passed to exit() to indicate successful
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* or unsuccessful termination, respectively.
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*
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* Input Parameters:
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* status - Exit status code
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*
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* Returned Value:
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* Does not return.
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*
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****************************************************************************/
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void exit(int status)
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{
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/* Run the registered exit functions */
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atexit_call_exitfuncs(status, false);
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#ifdef CONFIG_FILE_STREAM
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/* Flush all streams */
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fflush(NULL);
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#endif
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/* Then perform the exit */
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_exit(status);
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}
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/****************************************************************************
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* Name: quick_exit
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*
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* Description:
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* The quick_exit() function exits the program quickly calling any cleanup
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* functions registered with at_quick_exit(3) but not any C++ destructors
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* or cleanup code registered with atexit(3). The stdio(3) file buffers
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* are not flushed.
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*
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* Input Parameters:
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* status - Exit status code
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*
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* Returned Value:
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* Does not return.
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*
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****************************************************************************/
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void quick_exit(int status)
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{
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/* Run the registered exit functions */
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atexit_call_exitfuncs(status, true);
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/* Then perform the exit */
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_exit(status);
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}
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/****************************************************************************
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* Name: _Exit
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*
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* Description:
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* The _Exit() functions shall not call functions registered with atexit()
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* nor any registered signal handlers. Open streams shall not be flushed.
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* Whether open streams are closed (without flushing) is implementation
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* defined.
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*
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* Input Parameters:
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* status - Exit status code
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*
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* Returned Value:
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* Does not return.
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*
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****************************************************************************/
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void _Exit(int status)
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{
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_exit(status);
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}
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#endif /* __KERNEL__ */
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