120 lines
2.5 KiB
C++
120 lines
2.5 KiB
C++
/*
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/.
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*
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* Copyright:
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* 2011-2016, Danny Robson <danny@nerdcruft.net>
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*/
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#include "debug/debugger.hpp"
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#include "debug/system.hpp"
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#include "log.hpp"
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#include "platform.hpp"
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#include <unistd.h>
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#include <sys/ptrace.h>
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#include <sys/wait.h>
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#include <signal.h>
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#if defined(PLATFORM_FREEBSD)
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#define PTRACE_ATTACH PT_ATTACH
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#define PTRACE_DETACH PT_DETACH
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#endif
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///////////////////////////////////////////////////////////////////////////////
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// Will return true if it is known we are under a debugger. This isn't
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// designed to exhaustively check for debuggers, only to offer conveniences.
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// Specifically: errors will return false.
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static
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bool
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is_debugged (void)
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{
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auto pid = fork ();
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if (pid == -1)
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return false;
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// We are the child
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if (pid == 0) {
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auto ppid = getppid ();
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int res;
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// attempt to trace our parent. this will fail if we're being debugged.
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if (ptrace (PTRACE_ATTACH, ppid, nullptr, 0) == 0) {
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waitpid (ppid, nullptr, 0);
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ptrace (PTRACE_DETACH, ppid, nullptr, 0);
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res = 0;
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} else {
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res = 1;
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}
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_exit (res);
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// We are the parent. Wait for our child to tell us the result.
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} else {
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int status;
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waitpid (pid, &status, 0);
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return WEXITSTATUS (status);
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}
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}
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///////////////////////////////////////////////////////////////////////////////
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void
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breakpoint (void)
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{
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raise (SIGTRAP);
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}
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///////////////////////////////////////////////////////////////////////////////
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void
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prepare_debugger (void)
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{
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;
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}
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//-----------------------------------------------------------------------------
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void
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await_debugger (void)
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{
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LOG_INFO ("awaiting debugger");
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if (is_debugged ())
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breakpoint ();
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else
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raise (SIGSTOP);
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}
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///////////////////////////////////////////////////////////////////////////////
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#include <fenv.h>
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void
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enable_fpe (void)
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{
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feenableexcept (FE_INVALID);
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}
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//-----------------------------------------------------------------------------
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void
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disable_fpe (void)
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{
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feenableexcept (0);
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}
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///////////////////////////////////////////////////////////////////////////////
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void
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force_console (void)
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{
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if (!isatty (fileno (stdout) && !isatty (fileno (stderr)))) {
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LOG_WARN ("expected debugging under a console");
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}
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}
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