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Use typedef PyOS_sighandler_t and APIs PyOS_getsig() and 

PyOS_setsig(), instead of directly calling signal() or sigaction().

This fixes the second half of bug #110611: the mysterious ignoring of
the first ^C when readline isn't used.
This commit is contained in:
Guido van Rossum 2000-09-16 16:35:28 +00:00
parent 6f25618be5
commit d2cd7adf6f
1 changed files with 12 additions and 25 deletions
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37
Modules/signalmodule.c
View File

@ -17,7 +17,7 @@
#include <signal.h>
#ifndef SIG_ERR
#define SIG_ERR ((void (*)(int))-1)
#define SIG_ERR ((PyOS_sighandler_t)(-1))
#endif
#if defined(PYOS_OS2)
@ -38,7 +38,6 @@
#endif
/*
NOTES ON THE INTERACTION BETWEEN SIGNALS AND THREADS
@ -83,10 +82,9 @@ static PyObject *DefaultHandler;
static PyObject *IgnoreHandler;
static PyObject *IntHandler;
static void (*old_siginthandler)(int) = SIG_DFL;
static PyOS_sighandler_t old_siginthandler = SIG_DFL;
static PyObject *
signal_default_int_handler(PyObject *self, PyObject *args)
{
@ -100,7 +98,6 @@ static char default_int_handler_doc[] =
The default handler for SIGINT instated by Python.\n\
It raises KeyboardInterrupt.";
static int
checksignals_witharg(void * unused)
@ -133,11 +130,10 @@ signal_handler(int sig_num)
#ifdef HAVE_SIGINTERRUPT
siginterrupt(sig_num, 1);
#endif
signal(sig_num, signal_handler);
PyOS_setsig(sig_num, signal_handler);
}
#ifdef HAVE_ALARM
static PyObject *
signal_alarm(PyObject *self, PyObject *args)
@ -181,7 +177,7 @@ Wait until a signal arrives.";
#endif
static PyObject *
signal_signal(PyObject *self, PyObject *args)
{
@ -217,7 +213,7 @@ signal_signal(PyObject *self, PyObject *args)
#ifdef HAVE_SIGINTERRUPT
siginterrupt(sig_num, 1);
#endif
if (signal(sig_num, func) == SIG_ERR) {
if (PyOS_setsig(sig_num, func) == SIG_ERR) {
PyErr_SetFromErrno(PyExc_RuntimeError);
return NULL;
}
@ -239,7 +235,7 @@ returned. See getsignal() for possible return values.\n\
A signal handler function is called with two arguments:\n\
the first is the signal number, the second is the interrupted stack frame.";
static PyObject *
signal_getsignal(PyObject *self, PyObject *args)
{
@ -267,7 +263,7 @@ None -- if an unknown handler is in effect\n\
anything else -- the callable Python object used as a handler\n\
";
/* List of functions defined in the module */
static PyMethodDef signal_methods[] = {
#ifdef HAVE_ALARM
@ -284,7 +280,6 @@ static PyMethodDef signal_methods[] = {
};
static char module_doc[] =
"This module provides mechanisms to use signal handlers in Python.\n\
\n\
@ -346,14 +341,7 @@ initsignal(void)
Handlers[0].tripped = 0;
for (i = 1; i < NSIG; i++) {
void (*t)(int);
#ifdef HAVE_SIGACTION
struct sigaction act;
sigaction(i, 0, &act);
t = act.sa_handler;
#else
t = signal(i, SIG_IGN);
signal(i, t);
#endif
t = PyOS_getsig(i);
Handlers[i].tripped = 0;
if (t == SIG_DFL)
Handlers[i].func = DefaultHandler;
@ -368,7 +356,7 @@ initsignal(void)
Py_INCREF(IntHandler);
Py_DECREF(Handlers[SIGINT].func);
Handlers[SIGINT].func = IntHandler;
old_siginthandler = signal(SIGINT, &signal_handler);
old_siginthandler = PyOS_setsig(SIGINT, &signal_handler);
}
#ifdef SIGHUP
@ -555,7 +543,7 @@ finisignal(void)
int i;
PyObject *func;
signal(SIGINT, old_siginthandler);
PyOS_setsig(SIGINT, old_siginthandler);
old_siginthandler = SIG_DFL;
for (i = 1; i < NSIG; i++) {
@ -564,7 +552,7 @@ finisignal(void)
Handlers[i].func = NULL;
if (i != SIGINT && func != NULL && func != Py_None &&
func != DefaultHandler && func != IgnoreHandler)
signal(i, SIG_DFL);
PyOS_setsig(i, SIG_DFL);
Py_XDECREF(func);
}
@ -577,7 +565,6 @@ finisignal(void)
}
/* Declared in pyerrors.h */
int
PyErr_CheckSignals(void)
@ -615,7 +602,7 @@ PyErr_CheckSignals(void)
return 0;
}
/* Replacements for intrcheck.c functionality
* Declared in pyerrors.h
*/