4d215aad85
I'm skeptical about the usefulness of this, but it's in POSIX, it's in glibc (but not iOS), and it is used in some internal source (test runners and container code). Bug: N/A Test: ran tests Change-Id: I92c5398f2a679b21a33fba92bc8e67e3ae2eb76f
59 lines
2.2 KiB
C++
59 lines
2.2 KiB
C++
/*
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* Copyright (C) 2015 The Android Open Source Project
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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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
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <sys/xattr.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include "private/FdPath.h"
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extern "C" ssize_t ___fgetxattr(int, const char*, void*, size_t);
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ssize_t fgetxattr(int fd, const char *name, void *value, size_t size) {
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int saved_errno = errno;
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ssize_t result = ___fgetxattr(fd, name, value, size);
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if (result != -1 || errno != EBADF) {
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return result;
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}
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// fd could be an O_PATH file descriptor, and the kernel
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// may not directly support fgetxattr() on such a file descriptor.
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// Use /proc/self/fd instead to emulate this support.
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int fd_flag = fcntl(fd, F_GETFL);
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if (fd_flag == -1 || (fd_flag & O_PATH) == 0) {
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errno = EBADF;
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return -1;
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}
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errno = saved_errno;
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return getxattr(FdPath(fd).c_str(), name, value, size);
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}
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