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intrcheck.c
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185 lines (145 loc) · 2.72 KB
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/* Check for interrupts */
#include "Python.h"
#ifdef QUICKWIN
#include <io.h>
void
PyOS_InitInterrupts(void)
{
}
void
PyOS_FiniInterrupts(void)
{
}
int
PyOS_InterruptOccurred(void)
{
_wyield();
}
#define OK
#endif /* QUICKWIN */
#if defined(_M_IX86) && !defined(__QNX__)
#include <io.h>
#endif
#if defined(MSDOS) && !defined(QUICKWIN)
#ifdef __GNUC__
/* This is for DJGPP's GO32 extender. I don't know how to trap
* control-C (There's no API for ctrl-C, and I don't want to mess with
* the interrupt vectors.) However, this DOES catch control-break.
* --Amrit
*/
#include <go32.h>
void
PyOS_InitInterrupts(void)
{
_go32_want_ctrl_break(1 /* TRUE */);
}
void
PyOS_FiniInterrupts(void)
{
}
int
PyOS_InterruptOccurred(void)
{
return _go32_was_ctrl_break_hit();
}
#else /* !__GNUC__ */
/* This might work for MS-DOS (untested though): */
void
PyOS_InitInterrupts(void)
{
}
void
PyOS_FiniInterrupts(void)
{
}
int
PyOS_InterruptOccurred(void)
{
int interrupted = 0;
while (kbhit()) {
if (getch() == '\003')
interrupted = 1;
}
return interrupted;
}
#endif /* __GNUC__ */
#define OK
#endif /* MSDOS && !QUICKWIN */
#ifndef OK
/* Default version -- for real operating systems and for Standard C */
#include <stdio.h>
#include <string.h>
#include <signal.h>
static int interrupted;
void
PyErr_SetInterrupt(void)
{
interrupted = 1;
}
extern int PyErr_CheckSignals(void);
static int
checksignals_witharg(void * arg)
{
return PyErr_CheckSignals();
}
static void
intcatcher(int sig)
{
extern void Py_Exit(int);
static char message[] =
"python: to interrupt a truly hanging Python program, interrupt once more.\n";
switch (interrupted++) {
case 0:
break;
case 1:
#ifdef RISCOS
fprintf(stderr, message);
#else
write(2, message, strlen(message));
#endif
break;
case 2:
interrupted = 0;
Py_Exit(1);
break;
}
signal(SIGINT, intcatcher);
Py_AddPendingCall(checksignals_witharg, NULL);
}
static void (*old_siginthandler)(int) = SIG_DFL;
void
PyOS_InitInterrupts(void)
{
if ((old_siginthandler = signal(SIGINT, SIG_IGN)) != SIG_IGN)
signal(SIGINT, intcatcher);
#ifdef HAVE_SIGINTERRUPT
/* This is for SunOS and other modern BSD derivatives.
It means that system calls (like read()) are not restarted
after an interrupt. This is necessary so interrupting a
read() or readline() call works as expected.
XXX On old BSD (pure 4.2 or older) you may have to do this
differently! */
siginterrupt(SIGINT, 1);
#endif /* HAVE_SIGINTERRUPT */
}
void
PyOS_FiniInterrupts(void)
{
signal(SIGINT, old_siginthandler);
}
int
PyOS_InterruptOccurred(void)
{
if (!interrupted)
return 0;
interrupted = 0;
return 1;
}
#endif /* !OK */
void
PyOS_AfterFork(void)
{
#ifdef WITH_THREAD
PyEval_ReInitThreads();
#endif
}