651f1fa509
Technically, std::atomic does not have an operator(). Previously, this code was relying on an implicit behavior of our C++ standard library in order to compile. When compiling this code against a different C++ standard library, I encountered a compiler error on these lines. This CL makes the std::atomic load() operation explicit, makes it clearer what this code is actually doing and makes it conform better to the C++ standard library spec rather than a particular implmentation. Change-Id: I7f255dffc0a3d8e07c973c18e9ba4098c4b5843e
87 lines
3 KiB
C++
87 lines
3 KiB
C++
/*
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* Copyright (C) 2019 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 <string.h>
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#include <sys/socket.h>
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#include <async_safe/log.h>
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#include "private/bionic_fdtrack.h"
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extern "C" ssize_t __recvmsg(int __fd, struct msghdr* __msg, int __flags);
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extern "C" int __recvmmsg(int __fd, struct mmsghdr* __msgs, unsigned int __msg_count, int __flags,
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const struct timespec* __timeout);
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static inline __attribute__((artificial)) __attribute__((always_inline)) void track_fds(
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struct msghdr* msg, const char* function_name) {
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if (!atomic_load(&__android_fdtrack_hook)) {
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return;
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}
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for (struct cmsghdr* cmsg = CMSG_FIRSTHDR(msg); cmsg; cmsg = CMSG_NXTHDR(msg, cmsg)) {
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if (cmsg->cmsg_type != SCM_RIGHTS) {
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continue;
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}
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if (cmsg->cmsg_len <= sizeof(struct cmsghdr)) {
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continue;
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}
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size_t data_length = cmsg->cmsg_len - sizeof(struct cmsghdr);
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if (data_length % sizeof(int) != 0) {
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async_safe_fatal("invalid cmsg length: %zu", data_length);
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}
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for (size_t offset = 0; offset < data_length; offset += sizeof(int)) {
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int fd;
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memcpy(&fd, CMSG_DATA(cmsg) + offset, sizeof(int));
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FDTRACK_CREATE_NAME(function_name, fd);
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}
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}
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}
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ssize_t recvmsg(int __fd, struct msghdr* __msg, int __flags) {
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ssize_t rc = __recvmsg(__fd, __msg, __flags);
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if (rc == -1) {
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return -1;
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}
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track_fds(__msg, "recvmsg");
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return rc;
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}
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int recvmmsg(int __fd, struct mmsghdr* __msgs, unsigned int __msg_count, int __flags,
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const struct timespec* __timeout) {
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int rc = __recvmmsg(__fd, __msgs, __msg_count, __flags, __timeout);
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if (rc == -1) {
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return -1;
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}
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for (int i = 0; i < rc; ++i) {
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track_fds(&__msgs[i].msg_hdr, "recvmmsg");
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}
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return rc;
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}
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