50080a29f7
Plain __ for generated syscalls didn't mean it was a hidden symbol, it just meant "please don't use this". We added ___ to signify that a hidden symbol should be generated, but then we added the map files anyway so you now have to explicitly export symbols. Given that, this convention serves no particular purpose so we may as well just use the nicer names have everything look the same. Test: treehugger Change-Id: If424e17a49c36f4be545f5d283c4561a6ea9c7ea
60 lines
2.5 KiB
C++
60 lines
2.5 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 <fcntl.h>
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#include <unistd.h>
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#include <errno.h>
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extern "C" int __faccessat(int, const char*, int);
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int faccessat(int dirfd, const char* pathname, int mode, int flags) {
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// "The mode specifies the accessibility check(s) to be performed,
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// and is either the value F_OK, or a mask consisting of the
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// bitwise OR of one or more of R_OK, W_OK, and X_OK."
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if ((mode != F_OK) && ((mode & ~(R_OK | W_OK | X_OK)) != 0) &&
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((mode & (R_OK | W_OK | X_OK)) == 0)) {
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errno = EINVAL;
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return -1;
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}
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if (flags != 0) {
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// We deliberately don't support AT_SYMLINK_NOFOLLOW, a glibc
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// only feature which is error prone and dangerous.
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// More details at http://permalink.gmane.org/gmane.linux.lib.musl.general/6952
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//
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// AT_EACCESS isn't supported either. Android doesn't have setuid
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// programs, and never runs code with euid!=uid. It could be
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// implemented in an expensive way, following the model at
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// https://gitlab.com/bminor/musl/commit/0a05eace163cee9b08571d2ff9d90f5e82d9c228
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// but not worth it.
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errno = EINVAL;
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return -1;
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}
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return __faccessat(dirfd, pathname, mode);
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}
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