mirror of
https://github.com/classilla/tenfourfox.git
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60 lines
1.7 KiB
C++
60 lines
1.7 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this file,
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* You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "SandboxLogging.h"
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#ifdef ANDROID
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#include <android/log.h>
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#endif
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#include <algorithm>
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#include <stdio.h>
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#include <sys/uio.h>
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#include <unistd.h>
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#include "base/posix/eintr_wrapper.h"
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namespace mozilla {
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// Alters an iovec array to remove the first `toDrop` bytes. This
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// complexity is necessary because writev can return a short write
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// (e.g., if stderr is a pipe and the buffer is almost full).
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static void
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IOVecDrop(struct iovec* iov, int iovcnt, size_t toDrop)
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{
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while (toDrop > 0 && iovcnt > 0) {
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size_t toDropHere = std::min(toDrop, iov->iov_len);
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iov->iov_base = static_cast<char*>(iov->iov_base) + toDropHere;
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iov->iov_len -= toDropHere;
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toDrop -= toDropHere;
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++iov;
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--iovcnt;
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}
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}
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void
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SandboxLogError(const char* message)
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{
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#ifdef ANDROID
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// This uses writev internally and appears to be async signal safe.
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__android_log_write(ANDROID_LOG_ERROR, "Sandbox", message);
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#endif
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static const char logPrefix[] = "Sandbox: ", logSuffix[] = "\n";
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struct iovec iovs[3] = {
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{ const_cast<char*>(logPrefix), sizeof(logPrefix) - 1 },
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{ const_cast<char*>(message), strlen(message) },
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{ const_cast<char*>(logSuffix), sizeof(logSuffix) - 1 },
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};
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while (iovs[2].iov_len > 0) {
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ssize_t written = HANDLE_EINTR(writev(STDERR_FILENO, iovs, 3));
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if (written <= 0) {
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break;
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}
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IOVecDrop(iovs, 3, static_cast<size_t>(written));
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}
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}
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}
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