comphelper/source/misc/debuggerinfo.cxx

   1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
   2 /*
   3  * This file is part of the LibreOffice project.
   4  *
   5  * This Source Code Form is subject to the terms of the Mozilla Public
   6  * License, v. 2.0. If a copy of the MPL was not distributed with this
   7  * file, You can obtain one at http://mozilla.org/MPL/2.0/.
   8  */
   9
  10 #include <comphelper/debuggerinfo.hxx>
  11
  12 #include <cassert>
  13 #include <cstring>
  14 #include <ctype.h>
  15
  16 #if defined(_WIN32)
  17 #define WIN32_LEAN_AND_MEAN
  18 #include <windows.h>
  19 #elif defined MACOSX
  20 #include <unistd.h>
  21 #include <sys/types.h>
  22 #include <sys/sysctl.h>
  23 #elif defined UNX
  24 #include <unistd.h>
  25 #include <fcntl.h>
  26 #endif
  27
  28 namespace comphelper
  29 {
  30 #if defined DBG_UTIL
  31 bool isDebuggerAttached()
  32 {
  33 #if defined(_WIN32)
  34     return IsDebuggerPresent();
  35 #elif defined MACOSX
  36     // https://developer.apple.com/library/archive/qa/qa1361/_index.html
  37     int junk;
  38     int mib[4];
  39     struct kinfo_proc info;
  40     size_t size;
  41
  42     // Initialize the flags so that, if sysctl fails for some bizarre
  43     // reason, we get a predictable result.
  44
  45     info.kp_proc.p_flag = 0;
  46
  47     // Initialize mib, which tells sysctl the info we want, in this case
  48     // we're looking for information about a specific process ID.
  49
  50     mib[0] = CTL_KERN;
  51     mib[1] = KERN_PROC;
  52     mib[2] = KERN_PROC_PID;
  53     mib[3] = getpid();
  54
  55     // Call sysctl.
  56
  57     size = sizeof(info);
  58     junk = sysctl(mib, sizeof(mib) / sizeof(*mib), &info, &size, nullptr, 0);
  59     assert(junk == 0);
  60
  61     // We're being debugged if the P_TRACED flag is set.
  62
  63     return ((info.kp_proc.p_flag & P_TRACED) != 0);
  64 #elif defined LINUX
  65     char buf[4096];
  66     int fd = open("/proc/self/status", O_RDONLY);
  67     if (fd < 0)
  68         return false;
  69     int size = read(fd, buf, sizeof(buf) - 1);
  70     close(fd);
  71     if (size < 0)
  72         return false;
  73     assert(size < int(sizeof(buf)) - 1);
  74     buf[sizeof(buf) - 1] = '\0';
  75     // "TracerPid: <pid>" for pid != 0 means something is attached
  76     const char* pos = strstr(buf, "TracerPid:");
  77     if (pos == nullptr)
  78         return false;
  79     pos += strlen("TracerPid:");
  80     while (*pos != '\n' && isspace(*pos))
  81         ++pos;
  82     return *pos != '\n' && *pos != '0';
  83 #else
  84     return false; // feel free to add your platform
  85 #endif
  86 }
  87 #endif
  88
  89 } // namespace comphelper
  90
  91 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */