// Copyright 2021 The Crashpad Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include "util/ios/raw_logging.h"
#include <atomic>
#include <string.h>
#include <sys/types.h>
#include <unistd.h>
#include "base/posix/eintr_wrapper.h"
namespace crashpad {
namespace internal {
namespace {
static_assert(std::atomic<FileHandle>::is_always_lock_free,
"std::atomic<FileHandle> may not be signal-safe");
std::atomic<FileHandle> g_file_handle = STDERR_FILENO;
} // namespace
void SetFileHandleForTesting(FileHandle file_handle) {
g_file_handle = file_handle;
}
void RawLogString(const char* message) {
const size_t message_len = strlen(message);
size_t bytes_written = 0;
while (bytes_written < message_len) {
int rv = HANDLE_EINTR(write(
g_file_handle, message + bytes_written, message_len - bytes_written));
if (rv < 0) {
// Give up, nothing we can do now.
break;
}
bytes_written += rv;
}
}
void RawLogInt(unsigned int number) {
char buffer[20];
char* digit = &buffer[sizeof(buffer) - 1];
*digit = '\0';
do {
*(--digit) = (number % 10) + '0';
number /= 10;
} while (number != 0);
RawLogString(digit);
}
// Prints `path:linenum message:error` (with optional `:error`).
void RawLog(const char* file, int line, const char* message, int error) {
RawLogString(file);
HANDLE_EINTR(write(g_file_handle, ":", 1));
RawLogInt(line);
HANDLE_EINTR(write(g_file_handle, " ", 1));
RawLogString(message);
if (error) {
RawLogString(": ");
RawLogInt(error);
}
HANDLE_EINTR(write(g_file_handle, "\n", 1));
}
} // namespace internal
} // namespace crashpad