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245 lines
7.3 KiB
C++
245 lines
7.3 KiB
C++
//===- Signals.cpp - Generic Unix Signals Implementation -----*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file defines some helpful functions for dealing with the possibility of
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// Unix signals occuring while your program is running.
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//
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//===----------------------------------------------------------------------===//
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#include "Unix.h"
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#include "llvm/ADT/STLExtras.h"
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#include "llvm/System/Mutex.h"
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#include <vector>
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#include <algorithm>
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#if HAVE_EXECINFO_H
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# include <execinfo.h> // For backtrace().
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#endif
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#if HAVE_SIGNAL_H
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#include <signal.h>
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#endif
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#if HAVE_SYS_STAT_H
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#include <sys/stat.h>
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#endif
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#if HAVE_DLFCN_H && __GNUG__
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#include <dlfcn.h>
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#include <cxxabi.h>
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#endif
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using namespace llvm;
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static RETSIGTYPE SignalHandler(int Sig); // defined below.
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static SmartMutex<true> SignalsMutex;
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/// InterruptFunction - The function to call if ctrl-c is pressed.
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static void (*InterruptFunction)() = 0;
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static std::vector<sys::Path> *FilesToRemove = 0;
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static std::vector<std::pair<void(*)(void*), void*> > *CallBacksToRun = 0;
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// IntSigs - Signals that may interrupt the program at any time.
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static const int IntSigs[] = {
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SIGHUP, SIGINT, SIGQUIT, SIGPIPE, SIGTERM, SIGUSR1, SIGUSR2
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};
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static const int *const IntSigsEnd =
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IntSigs + sizeof(IntSigs) / sizeof(IntSigs[0]);
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// KillSigs - Signals that are synchronous with the program that will cause it
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// to die.
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static const int KillSigs[] = {
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SIGILL, SIGTRAP, SIGABRT, SIGFPE, SIGBUS, SIGSEGV, SIGSYS, SIGXCPU, SIGXFSZ
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#ifdef SIGEMT
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, SIGEMT
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#endif
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};
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static const int *const KillSigsEnd =
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KillSigs + sizeof(KillSigs) / sizeof(KillSigs[0]);
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static unsigned NumRegisteredSignals = 0;
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static struct {
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struct sigaction SA;
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int SigNo;
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} RegisteredSignalInfo[(sizeof(IntSigs)+sizeof(KillSigs))/sizeof(KillSigs[0])];
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static void RegisterHandler(int Signal) {
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assert(NumRegisteredSignals <
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sizeof(RegisteredSignalInfo)/sizeof(RegisteredSignalInfo[0]) &&
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"Out of space for signal handlers!");
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struct sigaction NewHandler;
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NewHandler.sa_handler = SignalHandler;
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NewHandler.sa_flags = SA_NODEFER|SA_RESETHAND;
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sigemptyset(&NewHandler.sa_mask);
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// Install the new handler, save the old one in RegisteredSignalInfo.
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sigaction(Signal, &NewHandler,
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&RegisteredSignalInfo[NumRegisteredSignals].SA);
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RegisteredSignalInfo[NumRegisteredSignals].SigNo = Signal;
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++NumRegisteredSignals;
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}
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static void RegisterHandlers() {
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// If the handlers are already registered, we're done.
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if (NumRegisteredSignals != 0) return;
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std::for_each(IntSigs, IntSigsEnd, RegisterHandler);
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std::for_each(KillSigs, KillSigsEnd, RegisterHandler);
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}
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static void UnregisterHandlers() {
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// Restore all of the signal handlers to how they were before we showed up.
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for (unsigned i = 0, e = NumRegisteredSignals; i != e; ++i)
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sigaction(RegisteredSignalInfo[i].SigNo,
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&RegisteredSignalInfo[i].SA, 0);
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NumRegisteredSignals = 0;
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}
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// SignalHandler - The signal handler that runs.
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static RETSIGTYPE SignalHandler(int Sig) {
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// Restore the signal behavior to default, so that the program actually
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// crashes when we return and the signal reissues. This also ensures that if
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// we crash in our signal handler that the program will terminate immediately
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// instead of recursing in the signal handler.
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UnregisterHandlers();
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// Unmask all potentially blocked kill signals.
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sigset_t SigMask;
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sigfillset(&SigMask);
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sigprocmask(SIG_UNBLOCK, &SigMask, 0);
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SignalsMutex.acquire();
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if (FilesToRemove != 0)
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while (!FilesToRemove->empty()) {
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FilesToRemove->back().eraseFromDisk(true);
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FilesToRemove->pop_back();
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}
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if (std::find(IntSigs, IntSigsEnd, Sig) != IntSigsEnd) {
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if (InterruptFunction) {
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void (*IF)() = InterruptFunction;
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SignalsMutex.release();
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InterruptFunction = 0;
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IF(); // run the interrupt function.
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return;
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}
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SignalsMutex.release();
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raise(Sig); // Execute the default handler.
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return;
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}
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SignalsMutex.release();
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// Otherwise if it is a fault (like SEGV) run any handler.
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if (CallBacksToRun)
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for (unsigned i = 0, e = CallBacksToRun->size(); i != e; ++i)
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(*CallBacksToRun)[i].first((*CallBacksToRun)[i].second);
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}
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void llvm::sys::SetInterruptFunction(void (*IF)()) {
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SignalsMutex.acquire();
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InterruptFunction = IF;
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SignalsMutex.release();
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RegisterHandlers();
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}
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// RemoveFileOnSignal - The public API
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bool llvm::sys::RemoveFileOnSignal(const sys::Path &Filename,
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std::string* ErrMsg) {
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SignalsMutex.acquire();
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if (FilesToRemove == 0)
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FilesToRemove = new std::vector<sys::Path>();
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FilesToRemove->push_back(Filename);
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SignalsMutex.release();
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RegisterHandlers();
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return false;
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}
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/// AddSignalHandler - Add a function to be called when a signal is delivered
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/// to the process. The handler can have a cookie passed to it to identify
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/// what instance of the handler it is.
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void llvm::sys::AddSignalHandler(void (*FnPtr)(void *), void *Cookie) {
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if (CallBacksToRun == 0)
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CallBacksToRun = new std::vector<std::pair<void(*)(void*), void*> >();
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CallBacksToRun->push_back(std::make_pair(FnPtr, Cookie));
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RegisterHandlers();
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}
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// PrintStackTrace - In the case of a program crash or fault, print out a stack
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// trace so that the user has an indication of why and where we died.
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//
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// On glibc systems we have the 'backtrace' function, which works nicely, but
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// doesn't demangle symbols.
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static void PrintStackTrace(void *) {
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#ifdef HAVE_BACKTRACE
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static void* StackTrace[256];
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// Use backtrace() to output a backtrace on Linux systems with glibc.
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int depth = backtrace(StackTrace,
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static_cast<int>(array_lengthof(StackTrace)));
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#if HAVE_DLFCN_H && __GNUG__
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int width = 0;
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for (int i = 0; i < depth; ++i) {
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Dl_info dlinfo;
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dladdr(StackTrace[i], &dlinfo);
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const char* name = strrchr(dlinfo.dli_fname, '/');
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int nwidth;
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if (name == NULL) nwidth = strlen(dlinfo.dli_fname);
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else nwidth = strlen(name) - 1;
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if (nwidth > width) width = nwidth;
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}
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for (int i = 0; i < depth; ++i) {
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Dl_info dlinfo;
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dladdr(StackTrace[i], &dlinfo);
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fprintf(stderr, "%-2d", i);
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const char* name = strrchr(dlinfo.dli_fname, '/');
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if (name == NULL) fprintf(stderr, " %-*s", width, dlinfo.dli_fname);
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else fprintf(stderr, " %-*s", width, name+1);
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fprintf(stderr, " %#0*lx",
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(int)(sizeof(void*) * 2) + 2, (unsigned long)StackTrace[i]);
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if (dlinfo.dli_sname != NULL) {
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int res;
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fputc(' ', stderr);
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char* d = abi::__cxa_demangle(dlinfo.dli_sname, NULL, NULL, &res);
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if (d == NULL) fputs(dlinfo.dli_sname, stderr);
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else fputs(d, stderr);
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free(d);
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fprintf(stderr, " + %tu",(char*)StackTrace[i]-(char*)dlinfo.dli_saddr);
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}
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fputc('\n', stderr);
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}
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#else
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backtrace_symbols_fd(StackTrace, depth, STDERR_FILENO);
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#endif
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#endif
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}
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/// PrintStackTraceOnErrorSignal - When an error signal (such as SIBABRT or
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/// SIGSEGV) is delivered to the process, print a stack trace and then exit.
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void llvm::sys::PrintStackTraceOnErrorSignal() {
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AddSignalHandler(PrintStackTrace, 0);
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}
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