forked from OSchip/llvm-project
Signals support has been moved to lib/System
llvm-svn: 16097
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Reid Spencer
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//===- Signals.cpp - Signal Handling support ------------------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file was developed by the LLVM research group and is distributed under
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// the University of Illinois Open Source 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 "llvm/System/Signals.h"
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#include <vector>
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#include <algorithm>
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#include <cstdlib>
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#include <cstdio>
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#include "Config/config.h" // Get the signal handler return type
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#ifdef HAVE_EXECINFO_H
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# include <execinfo.h> // For backtrace().
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#endif
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#include <signal.h>
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#include <unistd.h>
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#include <sys/wait.h>
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#include <cerrno>
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using namespace llvm;
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static std::vector<std::string> FilesToRemove;
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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 *IntSigsEnd = 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 *KillSigsEnd = KillSigs + sizeof(KillSigs)/sizeof(KillSigs[0]);
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#ifdef HAVE_BACKTRACE
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static void* StackTrace[256];
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#endif
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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. In order to backtrace symbols, we fork and exec a
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// 'c++filt' process to do the demangling. This seems like the simplest and
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// most robust solution when we can't allocate memory (such as in a signal
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// handler). If we can't find 'c++filt', we fallback to printing mangled names.
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//
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static void PrintStackTrace() {
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#ifdef HAVE_BACKTRACE
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// Use backtrace() to output a backtrace on Linux systems with glibc.
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int depth = backtrace(StackTrace, sizeof(StackTrace)/sizeof(StackTrace[0]));
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// Create a one-way unix pipe. The backtracing process writes to PipeFDs[1],
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// the c++filt process reads from PipeFDs[0].
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int PipeFDs[2];
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if (pipe(PipeFDs)) {
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backtrace_symbols_fd(StackTrace, depth, STDERR_FILENO);
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return;
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}
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switch (pid_t ChildPID = fork()) {
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case -1: // Error forking, print mangled stack trace
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close(PipeFDs[0]);
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close(PipeFDs[1]);
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backtrace_symbols_fd(StackTrace, depth, STDERR_FILENO);
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return;
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default: // backtracing process
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close(PipeFDs[0]); // Close the reader side.
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// Print the mangled backtrace into the pipe.
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backtrace_symbols_fd(StackTrace, depth, PipeFDs[1]);
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close(PipeFDs[1]); // We are done writing.
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while (waitpid(ChildPID, 0, 0) == -1)
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if (errno != EINTR) break;
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return;
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case 0: // c++filt process
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close(PipeFDs[1]); // Close the writer side.
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dup2(PipeFDs[0], 0); // Read from standard input
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close(PipeFDs[0]); // Close the old descriptor
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dup2(2, 1); // Revector stdout -> stderr
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// Try to run c++filt or gc++filt. If neither is found, call back on 'cat'
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// to print the mangled stack trace. If we can't find cat, just exit.
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execlp("c++filt", "c++filt", 0);
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execlp("gc++filt", "gc++filt", 0);
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execlp("cat", "cat", 0);
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execlp("/bin/cat", "cat", 0);
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exit(0);
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}
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#endif
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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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while (!FilesToRemove.empty()) {
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std::remove(FilesToRemove.back().c_str());
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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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exit(1); // If this is an interrupt signal, exit the program
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// Otherwise if it is a fault (like SEGV) output the stacktrace to
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// STDERR (if we can) and reissue the signal to die...
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PrintStackTrace();
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signal(Sig, SIG_DFL);
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}
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static void RegisterHandler(int Signal) { signal(Signal, SignalHandler); }
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// RemoveFileOnSignal - The public API
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void llvm::RemoveFileOnSignal(const std::string &Filename) {
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FilesToRemove.push_back(Filename);
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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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/// 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::PrintStackTraceOnErrorSignal() {
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std::for_each(KillSigs, KillSigsEnd, RegisterHandler);
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}
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