lldb/tools/debugserver/source/MacOSX/OsLogger.cpp

   1 //===-- OsLogger.cpp --------------------------------------------*- C++ -*-===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8
   9 #include "OsLogger.h"
  10 #include <Availability.h>
  11
  12 #if (LLDB_USE_OS_LOG) && (__MAC_OS_X_VERSION_MAX_ALLOWED >= 101200)
  13
  14 #include <os/log.h>
  15
  16 #include "DNBDefs.h"
  17 #include "DNBLog.h"
  18
  19 #define LLDB_OS_LOG_MAX_BUFFER_LENGTH 256
  20
  21 namespace {
  22 // Darwin os_log logging callback that can be registered with
  23 // DNBLogSetLogCallback
  24 void DarwinLogCallback(void *baton, uint32_t flags, const char *format,
  25                        va_list args) {
  26   if (format == nullptr)
  27     return;
  28
  29   static os_log_t g_logger;
  30   if (!g_logger) {
  31     g_logger = os_log_create("com.apple.dt.lldb", "debugserver");
  32     if (!g_logger)
  33       return;
  34   }
  35
  36   os_log_type_t log_type;
  37   if (flags & DNBLOG_FLAG_FATAL)
  38     log_type = OS_LOG_TYPE_FAULT;
  39   else if (flags & DNBLOG_FLAG_ERROR)
  40     log_type = OS_LOG_TYPE_ERROR;
  41   else if (flags & DNBLOG_FLAG_WARNING)
  42     log_type = OS_LOG_TYPE_DEFAULT;
  43   else if (flags & DNBLOG_FLAG_VERBOSE)
  44     log_type = OS_LOG_TYPE_DEBUG;
  45   else
  46     log_type = OS_LOG_TYPE_DEFAULT;
  47
  48   // This code is unfortunate.  os_log* only takes static strings, but
  49   // our current log API isn't set up to make use of that style.
  50   char buffer[LLDB_OS_LOG_MAX_BUFFER_LENGTH];
  51   vsnprintf(buffer, sizeof(buffer), format, args);
  52   os_log_with_type(g_logger, log_type, "%{public}s", buffer);
  53 }
  54 }
  55
  56 DNBCallbackLog OsLogger::GetLogFunction() { return DarwinLogCallback; }
  57
  58 #else
  59
  60 DNBCallbackLog OsLogger::GetLogFunction() { return nullptr; }
  61
  62 #endif
  63