include/llvm/Support/Signals.h

   1 //===- llvm/Support/Signals.h - Signal Handling support ----------*- C++ -*-===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8 //
   9 // This file defines some helpful functions for dealing with the possibility of
  10 // unix signals occurring while your program is running.
  11 //
  12 //===----------------------------------------------------------------------===//
  13
  14 #ifndef LLVM_SUPPORT_SIGNALS_H
  15 #define LLVM_SUPPORT_SIGNALS_H
  16
  17 #include <string>
  18
  19 namespace llvm {
  20 class StringRef;
  21 class raw_ostream;
  22
  23 namespace sys {
  24
  25   /// This function runs all the registered interrupt handlers, including the
  26   /// removal of files registered by RemoveFileOnSignal.
  27   void RunInterruptHandlers();
  28
  29   /// This function registers signal handlers to ensure that if a signal gets
  30   /// delivered that the named file is removed.
  31   /// Remove a file if a fatal signal occurs.
  32   bool RemoveFileOnSignal(StringRef Filename, std::string* ErrMsg = nullptr);
  33
  34   /// This function removes a file from the list of files to be removed on
  35   /// signal delivery.
  36   void DontRemoveFileOnSignal(StringRef Filename);
  37
  38   /// When an error signal (such as SIGABRT or SIGSEGV) is delivered to the
  39   /// process, print a stack trace and then exit.
  40   /// Print a stack trace if a fatal signal occurs.
  41   /// \param Argv0 the current binary name, used to find the symbolizer
  42   ///        relative to the current binary before searching $PATH; can be
  43   ///        StringRef(), in which case we will only search $PATH.
  44   /// \param DisableCrashReporting if \c true, disable the normal crash
  45   ///        reporting mechanisms on the underlying operating system.
  46   void PrintStackTraceOnErrorSignal(StringRef Argv0,
  47                                     bool DisableCrashReporting = false);
  48
  49   /// Disable all system dialog boxes that appear when the process crashes.
  50   void DisableSystemDialogsOnCrash();
  51
  52   /// Print the stack trace using the given \c raw_ostream object.
  53   void PrintStackTrace(raw_ostream &OS);
  54
  55   // Run all registered signal handlers.
  56   void RunSignalHandlers();
  57
  58   using SignalHandlerCallback = void (*)(void *);
  59
  60   /// Add a function to be called when an abort/kill signal is delivered to the
  61   /// process. The handler can have a cookie passed to it to identify what
  62   /// instance of the handler it is.
  63   void AddSignalHandler(SignalHandlerCallback FnPtr, void *Cookie);
  64
  65   /// This function registers a function to be called when the user "interrupts"
  66   /// the program (typically by pressing ctrl-c).  When the user interrupts the
  67   /// program, the specified interrupt function is called instead of the program
  68   /// being killed, and the interrupt function automatically disabled.
  69   ///
  70   /// Note that interrupt functions are not allowed to call any non-reentrant
  71   /// functions.  An null interrupt function pointer disables the current
  72   /// installed function.  Note also that the handler may be executed on a
  73   /// different thread on some platforms.
  74   void SetInterruptFunction(void (*IF)());
  75
  76   /// Registers a function to be called when an "info" signal is delivered to
  77   /// the process.
  78   ///
  79   /// On POSIX systems, this will be SIGUSR1; on systems that have it, SIGINFO
  80   /// will also be used (typically ctrl-t).
  81   ///
  82   /// Note that signal handlers are not allowed to call any non-reentrant
  83   /// functions.  An null function pointer disables the current installed
  84   /// function.  Note also that the handler may be executed on a different
  85   /// thread on some platforms.
  86   void SetInfoSignalFunction(void (*Handler)());
  87
  88   /// Registers a function to be called when a "pipe" signal is delivered to
  89   /// the process.
  90   ///
  91   /// The "pipe" signal typically indicates a failed write to a pipe (SIGPIPE).
  92   /// The default installed handler calls `exit(EX_IOERR)`, causing the process
  93   /// to immediately exit with an IO error exit code.
  94   ///
  95   /// This function is only applicable on POSIX systems.
  96   void SetPipeSignalFunction(void (*Handler)());
  97
  98 } // End sys namespace
  99 } // End llvm namespace
 100
 101 #endif