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Break in the debugger in thread_ctrl::emergency_exit

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Implement IsDebuggerPresent analog for non-Windows systems.
This commit is contained in:
Nekotekina 2020-03-10 11:31:11 +03:00
parent 87d4b14ca9
commit adfd8ab43c
1 changed files with 57 additions and 1 deletions
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58
Utilities/Thread.cpp
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@ -76,6 +76,46 @@ void fmt_class_string<std::thread::id>::format(std::string& out, u64 arg)
}
}
#ifndef _WIN32
bool IsDebuggerPresent()
{
char buf[4096];
fs::file status_fd("/proc/self/status");
if (!status_fd)
{
std::fprintf(stderr, "Failed to open /proc/self/status\n");
return false;
}
const auto num_read = status_fd.read(buf, sizeof(buf) - 1);
if (num_read == 0 || num_read == umax)
{
std::fprintf(stderr, "Failed to read /proc/self/status (%d)\n", errno);
return false;
}
buf[num_read] = '\0';
std::string_view status = buf;
const auto found = status.find("TracerPid:");
if (found == umax)
{
std::fprintf(stderr, "Failed to find 'TracerPid:' in /proc/self/status\n");
return false;
}
for (const char* cp = status.data() + found + 10; cp <= status.data() + num_read; ++cp)
{
if (!std::isspace(*cp))
{
return std::isdigit(*cp) != 0 && *cp != '0';
}
}
return false;
}
#endif
enum x64_reg_t : u32
{
X64R_RAX = 0,
@ -1723,10 +1763,11 @@ const bool s_exception_handler_set = []() -> bool
if (::sigaction(SIGSEGV, &sa, NULL) == -1)
{
std::printf("sigaction(SIGSEGV) failed (0x%x).", errno);
std::fprintf(stderr, "sigaction(SIGSEGV) failed (0x%x).", errno);
std::abort();
}
std::printf("Debugger: %d\n", +IsDebuggerPresent());
return true;
}();
@ -2022,6 +2063,21 @@ void thread_ctrl::emergency_exit(std::string_view reason)
{
sig_log.fatal("Thread terminated due to fatal error: %s", reason);
std::fprintf(stderr, "Thread '%s' terminated due to fatal error: %s\n", g_tls_log_prefix().c_str(), std::string(reason).c_str());
#ifdef _WIN32
if (IsDebuggerPresent())
{
OutputDebugStringA(fmt::format("Thread '%s' terminated due to fatal error: %s\n", g_tls_log_prefix(), reason).c_str());
__debugbreak();
}
#else
if (IsDebuggerPresent())
{
__asm("int3;");
}
#endif
if (const auto _this = g_tls_this_thread)
{
if (_this->finalize(0))