NIDebuggingTools.m

//
// Copyright 2011-2014 NimbusKit
// Copyright 2009-2011 Facebook
//
// 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.
//

#import "NIDebuggingTools.h"

#if !defined(__has_feature) || !__has_feature(objc_arc)
#error "Nimbus requires ARC support."
#endif

NSInteger NIMaxLogLevel = NILOGLEVEL_WARNING;
BOOL NIDebugAssertionsShouldBreak = YES;

#if defined(DEBUG) || defined(NI_DEBUG)

#import <unistd.h>
#import <sys/sysctl.h>

// From: http://developer.apple.com/mac/library/qa/qa2004/qa1361.html
int NIIsInDebugger(void) {
  int                 mib[4];
  struct kinfo_proc   info;
  size_t              size;

  // Initialize the flags so that, if sysctl fails for some bizarre
  // reason, we get a predictable result.

  info.kp_proc.p_flag = 0;

  // Initialize mib, which tells sysctl the info we want, in this case
  // we're looking for information about a specific process ID.

  mib[0] = CTL_KERN;
  mib[1] = KERN_PROC;
  mib[2] = KERN_PROC_PID;
  mib[3] = getpid();

  // Call sysctl.

  size = sizeof(info);
  sysctl(mib, sizeof(mib) / sizeof(*mib), &info, &size, NULL, 0);

  // We're being debugged if the P_TRACED flag is set.

  return (info.kp_proc.p_flag & P_TRACED) != 0;
}

#endif // #if defined(DEBUG) || defined(NI_DEBUG)