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