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Add a new 'AddSignalHandler' function to Signals.h that allows

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arbitrary functions to be run when a crash happens.  Delete 
RemoveDirectoryOnSignal as it is dead and has never had clients.

Change PrintStackTraceOnErrorSignal to be implemented in terms of
AddSignalHandler.

I updated the Win32 versions of these APIs, but can't test them.
If there are any problems, I'd be happy to fix them as well.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@66072 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner
2009-03-04 21:21:36 +00:00
parent fd0339933b
commit 35033a5876
3 changed files with 88 additions and 141 deletions
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162
lib/System/Unix/Signals.inc
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@ -31,15 +31,11 @@
#endif
using namespace llvm;
namespace {
static bool StackTraceRequested = false;
/// InterruptFunction - The function to call if ctrl-c is pressed.
static void (*InterruptFunction)() = 0;
static std::vector<sys::Path> *FilesToRemove = 0 ;
static std::vector<sys::Path> *DirectoriesToRemove = 0;
static std::vector<sys::Path> *FilesToRemove = 0;
static std::vector<std::pair<void(*)(void*), void*> > *CallBacksToRun = 0;
// IntSigs - Signals that may interrupt the program at any time.
static const int IntSigs[] = {
@ -59,17 +55,77 @@ static const int KillSigs[] = {
static const int *const KillSigsEnd =
KillSigs + sizeof(KillSigs) / sizeof(KillSigs[0]);
#ifdef HAVE_BACKTRACE
static void* StackTrace[256];
#endif
// SignalHandler - The signal handler that runs...
static RETSIGTYPE SignalHandler(int Sig) {
if (FilesToRemove != 0)
while (!FilesToRemove->empty()) {
FilesToRemove->back().eraseFromDisk(true);
FilesToRemove->pop_back();
}
if (std::find(IntSigs, IntSigsEnd, Sig) != IntSigsEnd) {
if (InterruptFunction) {
void (*IF)() = InterruptFunction;
InterruptFunction = 0;
IF(); // run the interrupt function.
return;
}
exit(1); // If this is an interrupt signal, exit the program
}
// Otherwise if it is a fault (like SEGV) run any handler.
if (CallBacksToRun)
for (unsigned i = 0, e = CallBacksToRun->size(); i != e; ++i)
(*CallBacksToRun)[i].first((*CallBacksToRun)[i].second);
// Restore the signal behavior to default, so that the program actually
// crashes when we return and the signal reissues.
signal(Sig, SIG_DFL);
}
// Just call signal
static void RegisterHandler(int Signal) {
signal(Signal, SignalHandler);
}
void sys::SetInterruptFunction(void (*IF)()) {
InterruptFunction = IF;
RegisterHandler(SIGINT);
}
// RemoveFileOnSignal - The public API
bool sys::RemoveFileOnSignal(const sys::Path &Filename, std::string* ErrMsg) {
if (FilesToRemove == 0)
FilesToRemove = new std::vector<sys::Path>();
FilesToRemove->push_back(Filename);
std::for_each(IntSigs, IntSigsEnd, RegisterHandler);
std::for_each(KillSigs, KillSigsEnd, RegisterHandler);
return false;
}
/// AddSignalHandler - Add a function to be called when a signal is delivered
/// to the process. The handler can have a cookie passed to it to identify
/// what instance of the handler it is.
void sys::AddSignalHandler(void (*FnPtr)(void *), void *Cookie) {
if (CallBacksToRun == 0)
CallBacksToRun = new std::vector<std::pair<void(*)(void*), void*> >();
CallBacksToRun->push_back(std::make_pair(FnPtr, Cookie));
std::for_each(KillSigs, KillSigsEnd, RegisterHandler);
}
// PrintStackTrace - In the case of a program crash or fault, print out a stack
// trace so that the user has an indication of why and where we died.
//
// On glibc systems we have the 'backtrace' function, which works nicely, but
// doesn't demangle symbols.
static void PrintStackTrace() {
static void PrintStackTrace(void *) {
#ifdef HAVE_BACKTRACE
static void* StackTrace[256];
// Use backtrace() to output a backtrace on Linux systems with glibc.
int depth = backtrace(StackTrace,
static_cast<int>(array_lengthof(StackTrace)));
@ -118,91 +174,9 @@ static void PrintStackTrace() {
#endif
}
// SignalHandler - The signal handler that runs...
static RETSIGTYPE SignalHandler(int Sig) {
if (FilesToRemove != 0)
while (!FilesToRemove->empty()) {
FilesToRemove->back().eraseFromDisk(true);
FilesToRemove->pop_back();
}
if (DirectoriesToRemove != 0)
while (!DirectoriesToRemove->empty()) {
DirectoriesToRemove->back().eraseFromDisk(true);
DirectoriesToRemove->pop_back();
}
if (std::find(IntSigs, IntSigsEnd, Sig) != IntSigsEnd) {
if (InterruptFunction) {
void (*IF)() = InterruptFunction;
InterruptFunction = 0;
IF(); // run the interrupt function.
return;
} else {
exit(1); // If this is an interrupt signal, exit the program
}
}
// Otherwise if it is a fault (like SEGV) output the stacktrace to
// STDERR (if we can) and reissue the signal to die...
if (StackTraceRequested)
PrintStackTrace();
signal(Sig, SIG_DFL);
}
// Just call signal
static void RegisterHandler(int Signal) {
signal(Signal, SignalHandler);
}
}
void sys::SetInterruptFunction(void (*IF)()) {
InterruptFunction = IF;
RegisterHandler(SIGINT);
}
// RemoveFileOnSignal - The public API
bool sys::RemoveFileOnSignal(const sys::Path &Filename, std::string* ErrMsg) {
if (FilesToRemove == 0)
FilesToRemove = new std::vector<sys::Path>;
FilesToRemove->push_back(Filename);
std::for_each(IntSigs, IntSigsEnd, RegisterHandler);
std::for_each(KillSigs, KillSigsEnd, RegisterHandler);
return false;
}
// RemoveDirectoryOnSignal - The public API
bool sys::RemoveDirectoryOnSignal(const sys::Path& path, std::string* ErrMsg) {
// Not a directory?
struct stat buf;
if (0 != stat(path.c_str(), &buf)) {
MakeErrMsg(ErrMsg, path.toString() + ": can't get status of file");
return true;
}
if (!S_ISDIR(buf.st_mode)) {
if (ErrMsg)
*ErrMsg = path.toString() + " is not a directory";
return true;
}
if (DirectoriesToRemove == 0)
DirectoriesToRemove = new std::vector<sys::Path>;
DirectoriesToRemove->push_back(path);
std::for_each(IntSigs, IntSigsEnd, RegisterHandler);
std::for_each(KillSigs, KillSigsEnd, RegisterHandler);
return false;
}
/// PrintStackTraceOnErrorSignal - When an error signal (such as SIBABRT or
/// SIGSEGV) is delivered to the process, print a stack trace and then exit.
void sys::PrintStackTraceOnErrorSignal() {
StackTraceRequested = true;
std::for_each(KillSigs, KillSigsEnd, RegisterHandler);
AddSignalHandler(PrintStackTrace, 0);
}