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#include <Python.h>
#include <signal.h>
/* From pythonrun.c in the standard Python distribution */
/* Wrappers around sigaction() or signal(). */
/* It may seem odd that these functions do not interact with the rest of the
* system (i.e. their effects are not visible in the signal module) but
* this is apparently intentional, CPython works the same way. The signal
* handlers defined in the signal module define what happens if the normal
* Python signal handler is called.
*
* A bit whacky, but that's the way it is */
PyOS_sighandler_t
PyOS_getsig(int sig)
{
#ifdef SA_RESTART
/* assume sigaction exists */
struct sigaction context;
if (sigaction(sig, NULL, &context) == -1)
return SIG_ERR;
return context.sa_handler;
#else
PyOS_sighandler_t handler;
/* Special signal handling for the secure CRT in Visual Studio 2005 */
#if defined(_MSC_VER) && _MSC_VER >= 1400
switch (sig) {
/* Only these signals are valid */
case SIGINT:
case SIGILL:
case SIGFPE:
case SIGSEGV:
case SIGTERM:
case SIGBREAK:
case SIGABRT:
break;
/* Don't call signal() with other values or it will assert */
default:
return SIG_ERR;
}
#endif /* _MSC_VER && _MSC_VER >= 1400 */
handler = signal(sig, SIG_IGN);
if (handler != SIG_ERR)
signal(sig, handler);
return handler;
#endif
}
PyOS_sighandler_t
PyOS_setsig(int sig, PyOS_sighandler_t handler)
{
#ifdef SA_RESTART
/* assume sigaction exists */
struct sigaction context, ocontext;
context.sa_handler = handler;
sigemptyset(&context.sa_mask);
context.sa_flags = 0;
if (sigaction(sig, &context, &ocontext) == -1)
return SIG_ERR;
return ocontext.sa_handler;
#else
PyOS_sighandler_t oldhandler;
oldhandler = signal(sig, handler);
#ifndef MS_WINDOWS
/* should check if this exists */
siginterrupt(sig, 1);
#endif
return oldhandler;
#endif
}
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