|
|
|
// Copyright 2017 The Abseil 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
|
|
|
|
//
|
|
|
|
// https://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 "absl/base/internal/raw_logging.h"
|
|
|
|
|
|
|
|
#include <cstdarg>
|
|
|
|
#include <cstddef>
|
|
|
|
#include <cstdio>
|
|
|
|
#include <cstdlib>
|
|
|
|
#include <cstring>
|
|
|
|
#include <string>
|
|
|
|
|
|
|
|
#include "absl/base/attributes.h"
|
|
|
|
#include "absl/base/config.h"
|
|
|
|
#include "absl/base/internal/atomic_hook.h"
|
|
|
|
#include "absl/base/internal/errno_saver.h"
|
|
|
|
#include "absl/base/log_severity.h"
|
|
|
|
|
|
|
|
// We know how to perform low-level writes to stderr in POSIX and Windows. For
|
|
|
|
// these platforms, we define the token ABSL_LOW_LEVEL_WRITE_SUPPORTED.
|
|
|
|
// Much of raw_logging.cc becomes a no-op when we can't output messages,
|
|
|
|
// although a FATAL ABSL_RAW_LOG message will still abort the process.
|
|
|
|
|
|
|
|
// ABSL_HAVE_POSIX_WRITE is defined when the platform provides posix write()
|
|
|
|
// (as from unistd.h)
|
|
|
|
//
|
|
|
|
// This preprocessor token is also defined in raw_io.cc. If you need to copy
|
|
|
|
// this, consider moving both to config.h instead.
|
|
|
|
#if defined(__linux__) || defined(__APPLE__) || defined(__FreeBSD__) || \
|
|
|
|
defined(__Fuchsia__) || defined(__native_client__) || \
|
|
|
|
defined(__OpenBSD__) || defined(__EMSCRIPTEN__) || defined(__ASYLO__)
|
|
|
|
|
|
|
|
#include <unistd.h>
|
|
|
|
|
|
|
|
#define ABSL_HAVE_POSIX_WRITE 1
|
|
|
|
#define ABSL_LOW_LEVEL_WRITE_SUPPORTED 1
|
|
|
|
#else
|
|
|
|
#undef ABSL_HAVE_POSIX_WRITE
|
|
|
|
#endif
|
|
|
|
|
|
|
|
// ABSL_HAVE_SYSCALL_WRITE is defined when the platform provides the syscall
|
|
|
|
// syscall(SYS_write, /*int*/ fd, /*char* */ buf, /*size_t*/ len);
|
|
|
|
// for low level operations that want to avoid libc.
|
|
|
|
#if (defined(__linux__) || defined(__FreeBSD__) || defined(__OpenBSD__)) && \
|
|
|
|
!defined(__ANDROID__)
|
|
|
|
#include <sys/syscall.h>
|
|
|
|
#define ABSL_HAVE_SYSCALL_WRITE 1
|
|
|
|
#define ABSL_LOW_LEVEL_WRITE_SUPPORTED 1
|
|
|
|
#else
|
|
|
|
#undef ABSL_HAVE_SYSCALL_WRITE
|
|
|
|
#endif
|
|
|
|
|
|
|
|
#ifdef _WIN32
|
|
|
|
#include <io.h>
|
|
|
|
|
|
|
|
#define ABSL_HAVE_RAW_IO 1
|
|
|
|
#define ABSL_LOW_LEVEL_WRITE_SUPPORTED 1
|
|
|
|
#else
|
|
|
|
#undef ABSL_HAVE_RAW_IO
|
|
|
|
#endif
|
|
|
|
|
|
|
|
namespace absl {
|
|
|
|
ABSL_NAMESPACE_BEGIN
|
|
|
|
namespace raw_logging_internal {
|
|
|
|
namespace {
|
|
|
|
|
|
|
|
// TODO(gfalcon): We want raw-logging to work on as many platforms as possible.
|
|
|
|
// Explicitly `#error` out when not `ABSL_LOW_LEVEL_WRITE_SUPPORTED`, except for
|
|
|
|
// a selected set of platforms for which we expect not to be able to raw log.
|
|
|
|
|
|
|
|
#ifdef ABSL_LOW_LEVEL_WRITE_SUPPORTED
|
|
|
|
constexpr char kTruncated[] = " ... (message truncated)\n";
|
|
|
|
|
|
|
|
// sprintf the format to the buffer, adjusting *buf and *size to reflect the
|
|
|
|
// consumed bytes, and return whether the message fit without truncation. If
|
|
|
|
// truncation occurred, if possible leave room in the buffer for the message
|
|
|
|
// kTruncated[].
|
|
|
|
bool VADoRawLog(char** buf, int* size, const char* format, va_list ap)
|
|
|
|
ABSL_PRINTF_ATTRIBUTE(3, 0);
|
|
|
|
bool VADoRawLog(char** buf, int* size, const char* format, va_list ap) {
|
|
|
|
int n = vsnprintf(*buf, *size, format, ap);
|
|
|
|
bool result = true;
|
|
|
|
if (n < 0 || n > *size) {
|
|
|
|
result = false;
|
|
|
|
if (static_cast<size_t>(*size) > sizeof(kTruncated)) {
|
|
|
|
n = *size - sizeof(kTruncated); // room for truncation message
|
|
|
|
} else {
|
|
|
|
n = 0; // no room for truncation message
|
|
|
|
}
|
|
|
|
}
|
|
|
|
*size -= n;
|
|
|
|
*buf += n;
|
|
|
|
return result;
|
|
|
|
}
|
|
|
|
#endif // ABSL_LOW_LEVEL_WRITE_SUPPORTED
|
|
|
|
|
|
|
|
constexpr int kLogBufSize = 3000;
|
|
|
|
|
|
|
|
// CAVEAT: vsnprintf called from *DoRawLog below has some (exotic) code paths
|
|
|
|
// that invoke malloc() and getenv() that might acquire some locks.
|
|
|
|
|
|
|
|
// Helper for RawLog below.
|
|
|
|
// *DoRawLog writes to *buf of *size and move them past the written portion.
|
|
|
|
// It returns true iff there was no overflow or error.
|
|
|
|
bool DoRawLog(char** buf, int* size, const char* format, ...)
|
|
|
|
ABSL_PRINTF_ATTRIBUTE(3, 4);
|
|
|
|
bool DoRawLog(char** buf, int* size, const char* format, ...) {
|
|
|
|
va_list ap;
|
|
|
|
va_start(ap, format);
|
|
|
|
int n = vsnprintf(*buf, *size, format, ap);
|
|
|
|
va_end(ap);
|
|
|
|
if (n < 0 || n > *size) return false;
|
|
|
|
*size -= n;
|
|
|
|
*buf += n;
|
|
|
|
return true;
|
|
|
|
}
|
|
|
|
|
|
|
|
bool DefaultLogFilterAndPrefix(absl::LogSeverity, const char* file, int line,
|
|
|
|
char** buf, int* buf_size) {
|
|
|
|
DoRawLog(buf, buf_size, "[%s : %d] RAW: ", file, line);
|
|
|
|
return true;
|
|
|
|
}
|
|
|
|
|
|
|
|
ABSL_INTERNAL_ATOMIC_HOOK_ATTRIBUTES
|
|
|
|
absl::base_internal::AtomicHook<LogFilterAndPrefixHook>
|
|
|
|
log_filter_and_prefix_hook(DefaultLogFilterAndPrefix);
|
|
|
|
ABSL_INTERNAL_ATOMIC_HOOK_ATTRIBUTES
|
|
|
|
absl::base_internal::AtomicHook<AbortHook> abort_hook;
|
|
|
|
|
|
|
|
void RawLogVA(absl::LogSeverity severity, const char* file, int line,
|
|
|
|
const char* format, va_list ap) ABSL_PRINTF_ATTRIBUTE(4, 0);
|
|
|
|
void RawLogVA(absl::LogSeverity severity, const char* file, int line,
|
|
|
|
const char* format, va_list ap) {
|
|
|
|
char buffer[kLogBufSize];
|
|
|
|
char* buf = buffer;
|
|
|
|
int size = sizeof(buffer);
|
|
|
|
#ifdef ABSL_LOW_LEVEL_WRITE_SUPPORTED
|
|
|
|
bool enabled = true;
|
|
|
|
#else
|
|
|
|
bool enabled = false;
|
|
|
|
#endif
|
|
|
|
|
|
|
|
#ifdef ABSL_MIN_LOG_LEVEL
|
|
|
|
if (severity < static_cast<absl::LogSeverity>(ABSL_MIN_LOG_LEVEL) &&
|
|
|
|
severity < absl::LogSeverity::kFatal) {
|
|
|
|
enabled = false;
|
|
|
|
}
|
|
|
|
#endif
|
|
|
|
|
|
|
|
enabled = log_filter_and_prefix_hook(severity, file, line, &buf, &size);
|
|
|
|
const char* const prefix_end = buf;
|
|
|
|
|
|
|
|
#ifdef ABSL_LOW_LEVEL_WRITE_SUPPORTED
|
|
|
|
if (enabled) {
|
|
|
|
bool no_chop = VADoRawLog(&buf, &size, format, ap);
|
|
|
|
if (no_chop) {
|
|
|
|
DoRawLog(&buf, &size, "\n");
|
|
|
|
} else {
|
|
|
|
DoRawLog(&buf, &size, "%s", kTruncated);
|
|
|
|
}
|
|
|
|
AsyncSignalSafeWriteToStderr(buffer, strlen(buffer));
|
|
|
|
}
|
|
|
|
#else
|
|
|
|
static_cast<void>(format);
|
|
|
|
static_cast<void>(ap);
|
|
|
|
#endif
|
|
|
|
|
|
|
|
// Abort the process after logging a FATAL message, even if the output itself
|
|
|
|
// was suppressed.
|
|
|
|
if (severity == absl::LogSeverity::kFatal) {
|
|
|
|
abort_hook(file, line, buffer, prefix_end, buffer + kLogBufSize);
|
|
|
|
abort();
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
// Non-formatting version of RawLog().
|
|
|
|
//
|
|
|
|
// TODO(gfalcon): When string_view no longer depends on base, change this
|
|
|
|
// interface to take its message as a string_view instead.
|
|
|
|
void DefaultInternalLog(absl::LogSeverity severity, const char* file, int line,
|
|
|
|
const std::string& message) {
|
|
|
|
RawLog(severity, file, line, "%.*s", static_cast<int>(message.size()),
|
|
|
|
message.data());
|
|
|
|
}
|
|
|
|
|
|
|
|
} // namespace
|
|
|
|
|
|
|
|
void AsyncSignalSafeWriteToStderr(const char* s, size_t len) {
|
|
|
|
absl::base_internal::ErrnoSaver errno_saver;
|
|
|
|
#if defined(ABSL_HAVE_SYSCALL_WRITE)
|
|
|
|
// We prefer calling write via `syscall` to minimize the risk of libc doing
|
|
|
|
// something "helpful".
|
|
|
|
syscall(SYS_write, STDERR_FILENO, s, len);
|
|
|
|
#elif defined(ABSL_HAVE_POSIX_WRITE)
|
|
|
|
write(STDERR_FILENO, s, len);
|
|
|
|
#elif defined(ABSL_HAVE_RAW_IO)
|
|
|
|
_write(/* stderr */ 2, s, len);
|
|
|
|
#else
|
|
|
|
// stderr logging unsupported on this platform
|
|
|
|
(void) s;
|
|
|
|
(void) len;
|
|
|
|
#endif
|
|
|
|
}
|
|
|
|
|
|
|
|
void RawLog(absl::LogSeverity severity, const char* file, int line,
|
|
|
|
const char* format, ...) {
|
|
|
|
va_list ap;
|
|
|
|
va_start(ap, format);
|
|
|
|
RawLogVA(severity, file, line, format, ap);
|
|
|
|
va_end(ap);
|
|
|
|
}
|
|
|
|
|
|
|
|
bool RawLoggingFullySupported() {
|
|
|
|
#ifdef ABSL_LOW_LEVEL_WRITE_SUPPORTED
|
|
|
|
return true;
|
|
|
|
#else // !ABSL_LOW_LEVEL_WRITE_SUPPORTED
|
|
|
|
return false;
|
|
|
|
#endif // !ABSL_LOW_LEVEL_WRITE_SUPPORTED
|
|
|
|
}
|
|
|
|
|
|
|
|
ABSL_INTERNAL_ATOMIC_HOOK_ATTRIBUTES ABSL_DLL
|
|
|
|
absl::base_internal::AtomicHook<InternalLogFunction>
|
|
|
|
internal_log_function(DefaultInternalLog);
|
|
|
|
|
|
|
|
void RegisterLogFilterAndPrefixHook(LogFilterAndPrefixHook func) {
|
|
|
|
log_filter_and_prefix_hook.Store(func);
|
|
|
|
}
|
|
|
|
|
|
|
|
void RegisterAbortHook(AbortHook func) { abort_hook.Store(func); }
|
|
|
|
|
|
|
|
void RegisterInternalLogFunction(InternalLogFunction func) {
|
|
|
|
internal_log_function.Store(func);
|
|
|
|
}
|
|
|
|
|
|
|
|
} // namespace raw_logging_internal
|
|
|
|
ABSL_NAMESPACE_END
|
|
|
|
} // namespace absl
|