Linux Sandbox: add RawSandboxDie()

sandbox/linux/seccomp-bpf/die.h

Index: sandbox/linux/seccomp-bpf/die.h
diff --git a/sandbox/linux/seccomp-bpf/die.h b/sandbox/linux/seccomp-bpf/die.h
index f15f10877e9eca0866c67c0198fa8c1d267152f1..7c95997c9c8e05ead7c0952b2dabe5c53a38cb7c 100644
--- a/sandbox/linux/seccomp-bpf/die.h
+++ b/sandbox/linux/seccomp-bpf/die.h
@@ -13,9 +13,13 @@ namespace playground2 {
 class Die {
  public:
   // This is the main API for using this file. Prints a error message and
-  // exits with a fatal error.
+  // exits with a fatal error. This is not async-signal safe.
   #define SANDBOX_DIE(m) playground2::Die::SandboxDie(m, __FILE__, __LINE__)
 
+  // An async signal safe version of the same API. Won't print the filename
+  // and line numbers.
+  #define RAW_SANDBOX_DIE(m) playground2::Die::RawSandboxDie(m)
+
   // Adds an informational message to the log file or stderr as appropriate.
   #define SANDBOX_INFO(m) playground2::Die::SandboxInfo(m, __FILE__, __LINE__)
 
@@ -31,6 +35,8 @@ class Die {
   static void SandboxDie(const char *msg, const char *file, int line)
     __attribute__((noreturn));
 
+  static void RawSandboxDie(const char *msg) __attribute__((noreturn));
+
   // This method gets called by SANDBOX_INFO(). There is normally no reason
   // to call it directly unless you are defining your own logging macro.
   static void SandboxInfo(const char *msg, const char *file, int line);