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Diffstat (limited to 'lib/System/Unix/Signals.cpp')
| -rw-r--r-- | lib/System/Unix/Signals.cpp | 170 |
1 files changed, 0 insertions, 170 deletions
diff --git a/lib/System/Unix/Signals.cpp b/lib/System/Unix/Signals.cpp deleted file mode 100644 index c6952298f4..0000000000 --- a/lib/System/Unix/Signals.cpp +++ /dev/null @@ -1,170 +0,0 @@ -//===- Signals.cpp - Generic Unix Signals Implementation -----*- C++ -*-===// -// -// 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 "Unix.h" -#include <vector> -#include <algorithm> -#if HAVE_EXECINFO_H -# include <execinfo.h> // For backtrace(). -#endif -#if HAVE_SIGNAL_H -#include <signal.h> -#endif - -namespace { - -std::vector<std::string> *FilesToRemove = 0 ; -std::vector<llvm::sys::Path> *DirectoriesToRemove = 0; - -// IntSigs - Signals that may interrupt the program at any time. -const int IntSigs[] = { - SIGHUP, SIGINT, SIGQUIT, SIGPIPE, SIGTERM, SIGUSR1, SIGUSR2 -}; -const int *IntSigsEnd = IntSigs + sizeof(IntSigs)/sizeof(IntSigs[0]); - -// KillSigs - Signals that are synchronous with the program that will cause it -// to die. -const int KillSigs[] = { - SIGILL, SIGTRAP, SIGABRT, SIGFPE, SIGBUS, SIGSEGV, SIGSYS, SIGXCPU, SIGXFSZ -#ifdef SIGEMT - , SIGEMT -#endif -}; -const int *KillSigsEnd = KillSigs + sizeof(KillSigs)/sizeof(KillSigs[0]); - -#ifdef HAVE_BACKTRACE -void* StackTrace[256]; -#endif - -// 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. In order to backtrace symbols, we fork and exec a -// 'c++filt' process to do the demangling. This seems like the simplest and -// most robust solution when we can't allocate memory (such as in a signal -// handler). If we can't find 'c++filt', we fallback to printing mangled names. -// -void PrintStackTrace() { -#ifdef HAVE_BACKTRACE - // Use backtrace() to output a backtrace on Linux systems with glibc. - int depth = backtrace(StackTrace, sizeof(StackTrace)/sizeof(StackTrace[0])); - - // Create a one-way unix pipe. The backtracing process writes to PipeFDs[1], - // the c++filt process reads from PipeFDs[0]. - int PipeFDs[2]; - if (pipe(PipeFDs)) { - backtrace_symbols_fd(StackTrace, depth, STDERR_FILENO); - return; - } - - switch (pid_t ChildPID = fork()) { - case -1: // Error forking, print mangled stack trace - close(PipeFDs[0]); - close(PipeFDs[1]); - backtrace_symbols_fd(StackTrace, depth, STDERR_FILENO); - return; - default: // backtracing process - close(PipeFDs[0]); // Close the reader side. - - // Print the mangled backtrace into the pipe. - backtrace_symbols_fd(StackTrace, depth, PipeFDs[1]); - close(PipeFDs[1]); // We are done writing. - while (waitpid(ChildPID, 0, 0) == -1) - if (errno != EINTR) break; - return; - - case 0: // c++filt process - close(PipeFDs[1]); // Close the writer side. - dup2(PipeFDs[0], 0); // Read from standard input - close(PipeFDs[0]); // Close the old descriptor - dup2(2, 1); // Revector stdout -> stderr - - // Try to run c++filt or gc++filt. If neither is found, call back on 'cat' - // to print the mangled stack trace. If we can't find cat, just exit. - execlp("c++filt", "c++filt", 0); - execlp("gc++filt", "gc++filt", 0); - execlp("cat", "cat", 0); - execlp("/bin/cat", "cat", 0); - exit(0); - } -#endif -} - -// SignalHandler - The signal handler that runs... -RETSIGTYPE SignalHandler(int Sig) { - if (FilesToRemove != 0) - while (!FilesToRemove->empty()) { - std::remove(FilesToRemove->back().c_str()); - FilesToRemove->pop_back(); - } - - if (DirectoriesToRemove != 0) - while (!DirectoriesToRemove->empty()) { - DirectoriesToRemove->back().destroyDirectory(true); - DirectoriesToRemove->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 (if we can) and reissue the signal to die... - PrintStackTrace(); - signal(Sig, SIG_DFL); -} - -// Just call signal -void RegisterHandler(int Signal) { - signal(Signal, SignalHandler); -} - -} - -namespace llvm { - -// RemoveFileOnSignal - The public API -void sys::RemoveFileOnSignal(const sys::Path &Filename) { - if (FilesToRemove == 0) - FilesToRemove = new std::vector<std::string>; - - FilesToRemove->push_back(Filename.toString()); - - std::for_each(IntSigs, IntSigsEnd, RegisterHandler); - std::for_each(KillSigs, KillSigsEnd, RegisterHandler); -} - -// RemoveDirectoryOnSignal - The public API -void sys::RemoveDirectoryOnSignal(const llvm::sys::Path& path) { - if (!path.isDirectory()) - return; - - 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); -} - -/// 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() { - std::for_each(KillSigs, KillSigsEnd, RegisterHandler); -} - -} - -// vim: sw=2 smartindent smarttab tw=80 autoindent expandtab |