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//===- Signals.cpp - Signal Handling support ------------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file was developed by the LLVM research group and is distributed under
// the University of Illinois Open Source License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file defines some helpful functions for dealing with the possibility of
// Unix signals occuring while your program is running.
//
//===----------------------------------------------------------------------===//
#include "Support/Signals.h"
#include <vector>
#include <algorithm>
#include <cstdlib>
#include <cstdio>
#include <execinfo.h>
#include <signal.h>
#include <unistd.h>
#include "Config/config.h" // Get the signal handler return type
using namespace llvm;
static std::vector<std::string> FilesToRemove;
// IntSigs - Signals that may interrupt the program at any time.
static const int IntSigs[] = {
SIGHUP, SIGINT, SIGQUIT, SIGKILL, SIGPIPE, SIGTERM, SIGUSR1, SIGUSR2
};
static const int *IntSigsEnd = IntSigs + sizeof(IntSigs)/sizeof(IntSigs[0]);
// KillSigs - Signals that are synchronous with the program that will cause it
// to die.
static const int KillSigs[] = {
SIGILL, SIGTRAP, SIGABRT, SIGFPE, SIGBUS, SIGSEGV, SIGSYS, SIGXCPU, SIGXFSZ
#ifdef SIGEMT
, SIGEMT
#endif
};
static const int *KillSigsEnd = KillSigs + sizeof(KillSigs)/sizeof(KillSigs[0]);
static void* StackTrace[256];
// SignalHandler - The signal handler that runs...
static RETSIGTYPE SignalHandler(int Sig) {
while (!FilesToRemove.empty()) {
std::remove(FilesToRemove.back().c_str());
FilesToRemove.pop_back();
}
if (std::find(IntSigs, IntSigsEnd, Sig) != IntSigsEnd)
exit(1); // If this is an interrupt signal, exit the program
// Otherwise if it is a fault (like SEGV) output the stacktrace to
// STDERR and reissue the signal to die...
int depth = backtrace(StackTrace, sizeof(StackTrace)/sizeof(StackTrace[0]));
backtrace_symbols_fd(StackTrace, depth, STDERR_FILENO);
signal(Sig, SIG_DFL);
}
static void RegisterHandler(int Signal) { signal(Signal, SignalHandler); }
// RemoveFileOnSignal - The public API
void llvm::RemoveFileOnSignal(const std::string &Filename) {
FilesToRemove.push_back(Filename);
std::for_each(IntSigs, IntSigsEnd, RegisterHandler);
std::for_each(KillSigs, KillSigsEnd, RegisterHandler);
}
/// PrintStackTraceOnErrorSignal - When an error signal (such as SIBABRT or
/// SIGSEGV) is delivered to the process, print a stack trace and then exit.
void llvm::PrintStackTraceOnErrorSignal() {
std::for_each(KillSigs, KillSigsEnd, RegisterHandler);
}
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