--- /dev/null
+// REQUIRES: shell
+// RUN: %clang -E -fno-integrated-cc1 %s | head | FileCheck %s
+
+// Test that the parent clang driver process doesn't crash when the child cc1
+// process receives a SIGPIPE (Unix-only).
+//
+// The child should exit with IO_ERR, and the parent should exit cleanly.
+
+// CHECK: sigpipe-handling.c
#ifndef LLVM_SUPPORT_LLVM_H
#define LLVM_SUPPORT_LLVM_H
+#include "llvm/ADT/Optional.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/Support/Allocator.h"
#include "llvm/Support/PrettyStackTrace.h"
private:
BumpPtrAllocator Alloc;
SmallVector<const char *, 0> Args;
- PrettyStackTraceProgram StackPrinter;
+ Optional<PrettyStackTraceProgram> StackPrinter;
};
} // namespace llvm
using namespace llvm::sys;
InitLLVM::InitLLVM(int &Argc, const char **&Argv,
- bool InstallPipeSignalExitHandler)
- : StackPrinter(Argc, Argv) {
+ bool InstallPipeSignalExitHandler) {
if (InstallPipeSignalExitHandler)
+ // The pipe signal handler must be installed before any other handlers are
+ // registered. This is because the Unix \ref RegisterHandlers function does
+ // not perform a sigaction() for SIGPIPE unless a one-shot handler is
+ // present, to allow long-lived processes (like lldb) to fully opt-out of
+ // llvm's SIGPIPE handling and ignore the signal safely.
sys::SetOneShotPipeSignalFunction(sys::DefaultOneShotPipeSignalHandler);
+ // Initialize the stack printer after installing the one-shot pipe signal
+ // handler, so we can perform a sigaction() for SIGPIPE on Unix if requested.
+ StackPrinter.emplace(Argc, Argv);
sys::PrintStackTraceOnErrorSignal(Argv[0]);
install_out_of_memory_new_handler();