27dca4d857
首先，POSIX规范规定文件描述符需要支持close-on-exec属性，修改前的vfs不支持close-on-exec，当exec系列函数执行时，进程所有的文件将会被关闭（0，1，2也重新被打开）。但是，系统有些时候是不能在exec时关闭全部文件的，例如在执行exec之前，就需要重定向进程的某些文件描述符时（使用dup2），就希望该文件不被关闭，继续保持重定向属性，shell执行进程并重定向其标准输出到文件，这是我们经常做的事情。 BREAKING CHANGE: 执行exec类函数后，进程拥有的文件描述符情况发生变化：修改前，默认关闭所有的进程文件描述符，0，1，2重新打开；修改后，除非文件描述符拥有FD_CLOEXEC标记，否则该描述符不会被关闭。 re #I3U81W Change-Id: I54e841ac88e9835ec23e97de0cbc906c4e11f5a4 Signed-off-by: Guangyao Ma <guangyao.ma@outlook.com>
104 lines
3.4 KiB
C
104 lines
3.4 KiB
C
/*
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* Copyright (c) 2013-2019 Huawei Technologies Co., Ltd. All rights reserved.
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* Copyright (c) 2020-2021 Huawei Device Co., Ltd. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without modification,
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* are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this list of
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* conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice, this list
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* of conditions and the following disclaimer in the documentation and/or other materials
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* provided with the distribution.
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*
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* 3. Neither the name of the copyright holder nor the names of its contributors may be used
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* to endorse or promote products derived from this software without specific prior written
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* permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
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* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include "capability_api.h"
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#include "errno.h"
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#include "fs/fs_operation.h"
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#include "fs/file.h"
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#include "string.h"
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#include "stdlib.h"
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#include "sys/stat.h"
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#include "vnode.h"
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#include "fs/mount.h"
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#include <fcntl.h>
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/****************************************************************************
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* Static Functions
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****************************************************************************/
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/****************************************************************************
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* Name: chattr
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*
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* Returned Value:
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* Zero on success; -1 on failure with errno set:
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*
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****************************************************************************/
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int chattr(const char *pathname, struct IATTR *attr)
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{
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struct Vnode *vnode = NULL;
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int ret;
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if (pathname == NULL || attr == NULL) {
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set_errno(EINVAL);
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return VFS_ERROR;
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}
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VnodeHold();
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ret = VnodeLookup(pathname, &vnode, 0);
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if (ret != LOS_OK) {
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goto errout_with_lock;
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}
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if ((vnode->originMount) && (vnode->originMount->mountFlags & MS_RDONLY)) {
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ret = -EROFS;
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goto errout_with_lock;
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}
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/* The way we handle the stat depends on the type of vnode that we
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* are dealing with.
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*/
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if (vnode->vop != NULL && vnode->vop->Chattr != NULL) {
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ret = vnode->vop->Chattr(vnode, attr);
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} else {
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ret = -ENOSYS;
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}
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VnodeDrop();
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if (ret < 0) {
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goto errout;
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}
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return OK;
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/* Failure conditions always set the errno appropriately */
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errout_with_lock:
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VnodeDrop();
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errout:
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set_errno(-ret);
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return VFS_ERROR;
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}
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