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