Remove cryptoppwin submodule (#754)

third_party/cryptoppwin/include/cryptopp/ossig.h

@@ -0,0 +1,128 @@
+// ossig.h - written and placed in the public domain by Jeffrey Walton
+//
+/// \file ossig.h
+/// \brief Utility class for trapping OS signals.
+/// \since Crypto++ 5.6.5
+
+#ifndef CRYPTOPP_OS_SIGNAL_H
+#define CRYPTOPP_OS_SIGNAL_H
+
+#include "config.h"
+
+#if defined(UNIX_SIGNALS_AVAILABLE)
+# include <signal.h>
+#endif
+
+NAMESPACE_BEGIN(CryptoPP)
+
+// ************** Unix and Linux compatibles ***************
+
+#if defined(UNIX_SIGNALS_AVAILABLE) || defined(CRYPTOPP_DOXYGEN_PROCESSING)
+
+/// \brief Signal handler function pointer
+/// \details SignalHandlerFn is provided as a stand alone function pointer with external "C" linkage
+/// \sa SignalHandler, NullSignalHandler
+extern "C" {
+    typedef void (*SignalHandlerFn) (int);
+}
+
+/// \brief Null signal handler function
+/// \param unused the signal number
+/// \details NullSignalHandler is provided as a stand alone function with external "C" linkage
+///  and not a static member function due to the member function's implicit
+///  external "C++" linkage.
+/// \sa SignalHandler, SignalHandlerFn
+extern "C" {
+    inline void NullSignalHandler(int unused) {CRYPTOPP_UNUSED(unused);}
+}
+
+/// Signal handler for Linux and Unix compatibles
+/// \tparam S Signal number
+/// \tparam O Flag indicating if an existing handler should be overwritten
+/// \details SignalHandler() can be used to install a signal handler with the signature
+///  <tt>void handler_fn(int)</tt>. If <tt>SignalHandlerFn</tt> is not <tt>NULL</tt>, then
+///  the sigaction is set to the function and the sigaction flags is set to the flags.
+///  If <tt>SignalHandlerFn</tt> is <tt>NULL</tt>, then a default handler is installed
+///  using sigaction flags set to 0. The default handler only returns from the call.
+/// \details Upon destruction the previous signal handler is restored if the former signal handler
+///  was replaced.
+/// \details On Cygwin systems using Newlib, you should define <tt>_XOPEN_SOURCE=700</tt> or
+///  <tt>_GNU_SOURCE</tt>; or use <tt>-std=gnu++03</tt>, <tt>-std=gnu++11</tt>, or similar. If
+///  you compile with <tt>-std=c++03</tt>, <tt>-std=c++11</tt> or similar, then define
+///  <tt>_XOPEN_SOURCE=700</tt>.
+/// \warning Do not use SignalHandler in a code block that uses <tt>setjmp</tt> or <tt>longjmp</tt>
+///  because the destructor may not run.
+/// \since Crypto++ 5.6.5
+/// \sa NullSignalHandler, SignalHandlerFn, \ref CRYPTOPP_ASSERT "CRYPTOPP_ASSERT", DebugTrapHandler
+template <int S, bool O=false>
+struct SignalHandler
+{
+    /// \brief Construct a signal handler
+    /// \param pfn Pointer to a signal handler function
+    /// \param flags Flags to use with the signal handler
+    /// \details SignalHandler() installs a signal handler with the signature
+    ///  <tt>void handler_fn(int)</tt>. If <tt>SignalHandlerFn</tt> is not <tt>NULL</tt>, then
+    ///  the sigaction is set to the function and the sigaction flags is set to the flags.
+    ///  If <tt>SignalHandlerFn</tt> is <tt>NULL</tt>, then a default handler is installed
+    ///  using sigaction flags set to 0. The default handler only returns from the call.
+    /// \details Upon destruction the previous signal handler is restored if the former signal handler
+    ///  was overwritten.
+    /// \details On Cygwin systems using Newlib, you should define <tt>_XOPEN_SOURCE=700</tt> or
+    ///  <tt>_GNU_SOURCE</tt>; or use <tt>-std=gnu++03</tt>, <tt>-std=gnu++11</tt>, or similar. If
+    ///  you compile with <tt>-std=c++03</tt>, <tt>-std=c++11</tt> or similar, then define
+    ///  <tt>_XOPEN_SOURCE=700</tt>.
+    /// \warning Do not use SignalHandler in a code block that uses <tt>setjmp</tt> or <tt>longjmp</tt>
+    ///  because the destructor may not run. <tt>setjmp</tt> is why cpu.cpp does not use SignalHandler
+    ///  during CPU feature testing.
+    /// \since Crypto++ 5.6.5
+    SignalHandler(SignalHandlerFn pfn = NULLPTR, int flags = 0) : m_installed(false)
+    {
+        // http://pubs.opengroup.org/onlinepubs/007908799/xsh/sigaction.html
+        struct sigaction new_handler;
+
+        do
+        {
+            int ret = 0;
+
+            ret = sigaction (S, 0, &m_old);
+            if (ret != 0) break; // Failed
+
+            // Don't step on another's handler if Overwrite=false
+            if (m_old.sa_handler != 0 && !O) break;
+
+            // Cygwin/Newlib requires -D_XOPEN_SOURCE=700
+            ret = sigemptyset (&new_handler.sa_mask);
+            if (ret != 0) break; // Failed
+
+            new_handler.sa_handler = (pfn ? pfn : &NullSignalHandler);
+            new_handler.sa_flags = (pfn ? flags : 0);
+
+            // Install it
+            ret = sigaction (S, &new_handler, 0);
+            if (ret != 0) break; // Failed
+
+            m_installed = true;
+
+        } while(0);
+    }
+
+    ~SignalHandler()
+    {
+        if (m_installed)
+            sigaction (S, &m_old, 0);
+    }
+
+private:
+    struct sigaction m_old;
+    bool m_installed;
+
+private:
+    // Not copyable
+    SignalHandler(const SignalHandler &);
+    void operator=(const SignalHandler &);
+};
+#endif
+
+NAMESPACE_END
+
+#endif // CRYPTOPP_OS_SIGNAL_H