a9939e9a23
Putting libmemunreachable in the global C++ namespace was an oversight, move it into namespace android. Test: m -j checkbuild Change-Id: I0799906f6463178cb04a719bb4054cad33a50dbe
93 lines
2.3 KiB
C++
93 lines
2.3 KiB
C++
/*
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* Copyright (C) 2016 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* 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,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <errno.h>
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#include <string.h>
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#include "LeakPipe.h"
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#include "log.h"
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namespace android {
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bool LeakPipe::SendFd(int sock, int fd) {
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struct msghdr hdr {};
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struct iovec iov {};
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unsigned int data = 0xfdfdfdfd;
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alignas(struct cmsghdr) char cmsgbuf[CMSG_SPACE(sizeof(int))];
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hdr.msg_iov = &iov;
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hdr.msg_iovlen = 1;
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iov.iov_base = &data;
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iov.iov_len = sizeof(data);
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hdr.msg_control = cmsgbuf;
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hdr.msg_controllen = CMSG_LEN(sizeof(int));
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struct cmsghdr* cmsg = CMSG_FIRSTHDR(&hdr);
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cmsg->cmsg_len = CMSG_LEN(sizeof(int));
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cmsg->cmsg_level = SOL_SOCKET;
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cmsg->cmsg_type = SCM_RIGHTS;
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*(int*)CMSG_DATA(cmsg) = fd;
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int ret = sendmsg(sock, &hdr, 0);
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if (ret < 0) {
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MEM_ALOGE("failed to send fd: %s", strerror(errno));
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return false;
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}
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if (ret == 0) {
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MEM_ALOGE("eof when sending fd");
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return false;
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}
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return true;
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}
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int LeakPipe::ReceiveFd(int sock) {
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struct msghdr hdr {};
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struct iovec iov {};
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unsigned int data;
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alignas(struct cmsghdr) char cmsgbuf[CMSG_SPACE(sizeof(int))];
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hdr.msg_iov = &iov;
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hdr.msg_iovlen = 1;
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iov.iov_base = &data;
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iov.iov_len = sizeof(data);
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hdr.msg_control = cmsgbuf;
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hdr.msg_controllen = CMSG_LEN(sizeof(int));
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int ret = recvmsg(sock, &hdr, 0);
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if (ret < 0) {
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MEM_ALOGE("failed to receive fd: %s", strerror(errno));
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return -1;
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}
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if (ret == 0) {
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MEM_ALOGE("eof when receiving fd");
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return -1;
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}
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struct cmsghdr* cmsg = CMSG_FIRSTHDR(&hdr);
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if (cmsg == NULL || cmsg->cmsg_level != SOL_SOCKET || cmsg->cmsg_type != SCM_RIGHTS) {
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MEM_ALOGE("missing fd while receiving fd");
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return -1;
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}
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return *(int*)CMSG_DATA(cmsg);
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}
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} // namespace android
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