Signals.cpp revision 7c97cee26a25f398c31be7f8853d363410f6a31e 
1//===- Signals.cpp - Signal Handling support ------------------------------===//
2//
3// This file defines some helpful functions for dealing with the possibility of
4// unix signals occuring while your program is running.
5//
6//===----------------------------------------------------------------------===//
7
8#include "Support/Signals.h"
9#include <vector>
10#include <algorithm>
11#include <cstdlib>
12#include <cstdio>
13#include <signal.h>
14using std::string;
15
16static std::vector<string> FilesToRemove;
17
18// IntSigs - Signals that may interrupt the program at any time.
19static const int IntSigs[] = {
20  SIGHUP, SIGINT, SIGQUIT, SIGKILL, SIGPIPE, SIGTERM, SIGUSR1, SIGUSR2
21};
22static const int *IntSigsEnd = IntSigs + sizeof(IntSigs)/sizeof(IntSigs[0]);
23
24// KillSigs - Signals that are synchronous with the program that will cause it
25// to die.
26static const int KillSigs[] = {
27  SIGILL, SIGTRAP, SIGABRT, SIGFPE, SIGBUS, SIGSEGV, SIGSYS, SIGXCPU, SIGXFSZ
28#ifdef SIGEMT
29  , SIGEMT
30#endif
31};
32static const int *KillSigsEnd = KillSigs + sizeof(KillSigs)/sizeof(KillSigs[0]);
33
34
35// SignalHandler - The signal handler that runs...
36static void SignalHandler(int Sig) {
37  while (!FilesToRemove.empty()) {
38    std::remove(FilesToRemove.back().c_str());
39    FilesToRemove.pop_back();
40  }
41
42  if (std::find(IntSigs, IntSigsEnd, Sig) != IntSigsEnd)
43    exit(1);   // If this is an interrupt signal, exit the program
44
45  // Otherwise if it is a fault (like SEGV) reissue the signal to die...
46}
47
48static void RegisterHandler(int Signal) { signal(Signal, SignalHandler); }
49
50// RemoveFileOnSignal - The public API
51void RemoveFileOnSignal(const string &Filename) {
52  FilesToRemove.push_back(Filename);
53
54  std::for_each(IntSigs, IntSigsEnd, RegisterHandler);
55  std::for_each(KillSigs, KillSigsEnd, RegisterHandler);
56}
57