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Guido van Rossumf70e43a1991-02-19 12:39:46 +00001/***********************************************************
Guido van Rossumb9f8d6e1995-01-04 19:08:09 +00002Copyright 1991-1995 by Stichting Mathematisch Centrum, Amsterdam,
3The Netherlands.
Guido van Rossumf70e43a1991-02-19 12:39:46 +00004
5 All Rights Reserved
6
Guido van Rossumd266eb41996-10-25 14:44:06 +00007Permission to use, copy, modify, and distribute this software and its
8documentation for any purpose and without fee is hereby granted,
Guido van Rossumf70e43a1991-02-19 12:39:46 +00009provided that the above copyright notice appear in all copies and that
Guido van Rossumd266eb41996-10-25 14:44:06 +000010both that copyright notice and this permission notice appear in
Guido van Rossumf70e43a1991-02-19 12:39:46 +000011supporting documentation, and that the names of Stichting Mathematisch
Guido van Rossumd266eb41996-10-25 14:44:06 +000012Centrum or CWI or Corporation for National Research Initiatives or
13CNRI not be used in advertising or publicity pertaining to
14distribution of the software without specific, written prior
15permission.
Guido van Rossumf70e43a1991-02-19 12:39:46 +000016
Guido van Rossumd266eb41996-10-25 14:44:06 +000017While CWI is the initial source for this software, a modified version
18is made available by the Corporation for National Research Initiatives
19(CNRI) at the Internet address ftp://ftp.python.org.
20
21STICHTING MATHEMATISCH CENTRUM AND CNRI DISCLAIM ALL WARRANTIES WITH
22REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF
23MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL STICHTING MATHEMATISCH
24CENTRUM OR CNRI BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL
25DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
26PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
27TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
28PERFORMANCE OF THIS SOFTWARE.
Guido van Rossumf70e43a1991-02-19 12:39:46 +000029
30******************************************************************/
31
Guido van Rossum85a5fbb1990-10-14 12:07:46 +000032/* Check for interrupts */
33
Guido van Rossum1d5735e1994-08-30 08:27:36 +000034#include "config.h"
Guido van Rossum1d5735e1994-08-30 08:27:36 +000035#include "myproto.h"
Guido van Rossumbae95181997-02-14 21:12:24 +000036#include "mymalloc.h" /* For ANY */
Guido van Rossum189e8f91992-01-19 16:29:05 +000037#include "intrcheck.h"
38
Guido van Rossumbae95181997-02-14 21:12:24 +000039/* Copied here from ceval.h -- can't include that file. */
40int Py_AddPendingCall Py_PROTO((int (*func) Py_PROTO((ANY *)), ANY *arg));
41
Guido van Rossumd6a15ad1991-06-24 22:30:42 +000042
Guido van Rossum1d5735e1994-08-30 08:27:36 +000043#ifdef QUICKWIN
44
45#include <io.h>
46
47void
Guido van Rossum86bea461997-04-29 21:03:06 +000048PyOS_InitInterrupts()
Guido van Rossum1d5735e1994-08-30 08:27:36 +000049{
50}
51
Guido van Rossumaee094c1997-08-02 03:02:27 +000052void
53PyOS_FiniInterrupts()
54{
55}
56
Guido van Rossum1d5735e1994-08-30 08:27:36 +000057int
Guido van Rossum86bea461997-04-29 21:03:06 +000058PyOS_InterruptOccurred()
Guido van Rossum1d5735e1994-08-30 08:27:36 +000059{
60 _wyield();
61}
62
63#define OK
64
65#endif /* QUICKWIN */
66
67#ifdef _M_IX86
68#include <io.h>
69#endif
70
71#if defined(MSDOS) && !defined(QUICKWIN)
72
73#ifdef __GNUC__
74
75/* This is for DJGPP's GO32 extender. I don't know how to trap
76 * control-C (There's no API for ctrl-C, and I don't want to mess with
77 * the interrupt vectors.) However, this DOES catch control-break.
78 * --Amrit
79 */
80
81#include <go32.h>
82
83void
Guido van Rossum86bea461997-04-29 21:03:06 +000084PyOS_InitInterrupts()
Guido van Rossum1d5735e1994-08-30 08:27:36 +000085{
86 _go32_want_ctrl_break(1 /* TRUE */);
87}
88
Guido van Rossumaee094c1997-08-02 03:02:27 +000089void
90PyOS_FiniInterrupts()
91{
92}
93
Guido van Rossum1d5735e1994-08-30 08:27:36 +000094int
Guido van Rossum86bea461997-04-29 21:03:06 +000095PyOS_InterruptOccurred()
Guido van Rossum1d5735e1994-08-30 08:27:36 +000096{
97 return _go32_was_ctrl_break_hit();
98}
99
100#else /* !__GNUC__ */
Guido van Rossum85a5fbb1990-10-14 12:07:46 +0000101
Guido van Rossum3f5da241990-12-20 15:06:42 +0000102/* This might work for MS-DOS (untested though): */
Guido van Rossum85a5fbb1990-10-14 12:07:46 +0000103
104void
Guido van Rossum86bea461997-04-29 21:03:06 +0000105PyOS_InitInterrupts()
Guido van Rossum85a5fbb1990-10-14 12:07:46 +0000106{
107}
108
Guido van Rossumaee094c1997-08-02 03:02:27 +0000109void
110PyOS_FiniInterrupts()
111{
112}
113
Guido van Rossum85a5fbb1990-10-14 12:07:46 +0000114int
Guido van Rossum86bea461997-04-29 21:03:06 +0000115PyOS_InterruptOccurred()
Guido van Rossum85a5fbb1990-10-14 12:07:46 +0000116{
117 int interrupted = 0;
118 while (kbhit()) {
119 if (getch() == '\003')
120 interrupted = 1;
121 }
122 return interrupted;
123}
124
Guido van Rossum1d5735e1994-08-30 08:27:36 +0000125#endif /* __GNUC__ */
126
Guido van Rossum85a5fbb1990-10-14 12:07:46 +0000127#define OK
128
Guido van Rossum1d5735e1994-08-30 08:27:36 +0000129#endif /* MSDOS && !QUICKWIN */
Guido van Rossum85a5fbb1990-10-14 12:07:46 +0000130
131
Guido van Rossumd6a15ad1991-06-24 22:30:42 +0000132#ifdef macintosh
Guido van Rossum85a5fbb1990-10-14 12:07:46 +0000133
Jack Jansen9fc39891995-01-27 14:40:41 +0000134/* The Mac interrupt code has moved to macglue.c */
Guido van Rossum85a5fbb1990-10-14 12:07:46 +0000135#define OK
136
Guido van Rossumd6a15ad1991-06-24 22:30:42 +0000137#endif /* macintosh */
Guido van Rossum85a5fbb1990-10-14 12:07:46 +0000138
139
140#ifndef OK
141
Guido van Rossum3f5da241990-12-20 15:06:42 +0000142/* Default version -- for real operating systems and for Standard C */
Guido van Rossum85a5fbb1990-10-14 12:07:46 +0000143
144#include <stdio.h>
Guido van Rossum1d5735e1994-08-30 08:27:36 +0000145#include <string.h>
Guido van Rossum85a5fbb1990-10-14 12:07:46 +0000146#include <signal.h>
Guido van Rossumfd8a3931996-12-02 18:27:33 +0000147#ifdef HAVE_UNISTD_H
148#include <unistd.h>
149#endif
Guido van Rossum85a5fbb1990-10-14 12:07:46 +0000150
Guido van Rossum62e376b1995-01-17 16:11:53 +0000151static int interrupted;
Guido van Rossum85a5fbb1990-10-14 12:07:46 +0000152
Guido van Rossum575d5611995-03-10 15:13:03 +0000153void
154PyErr_SetInterrupt()
155{
156 interrupted = 1;
157}
158
Guido van Rossum86bea461997-04-29 21:03:06 +0000159extern int PyErr_CheckSignals();
Guido van Rossumad74fa61997-01-21 06:00:33 +0000160
Guido van Rossumdf840d91992-03-27 17:29:44 +0000161/* ARGSUSED */
Guido van Rossum1d5735e1994-08-30 08:27:36 +0000162static RETSIGTYPE
163#ifdef _M_IX86
164intcatcher(int sig) /* So the C compiler shuts up */
165#else /* _M_IX86 */
Guido van Rossum85a5fbb1990-10-14 12:07:46 +0000166intcatcher(sig)
Guido van Rossumdf840d91992-03-27 17:29:44 +0000167 int sig; /* Not used by required by interface */
Guido van Rossum1d5735e1994-08-30 08:27:36 +0000168#endif /* _M_IX86 */
Guido van Rossum85a5fbb1990-10-14 12:07:46 +0000169{
Guido van Rossum86bea461997-04-29 21:03:06 +0000170 extern void Py_Exit Py_PROTO((int));
Guido van Rossumf1dc5661993-07-05 10:31:29 +0000171 static char message[] =
172"python: to interrupt a truly hanging Python program, interrupt once more.\n";
173 switch (interrupted++) {
174 case 0:
175 break;
176 case 1:
177 write(2, message, strlen(message));
178 break;
179 case 2:
180 interrupted = 0;
Guido van Rossum86bea461997-04-29 21:03:06 +0000181 Py_Exit(1);
Guido van Rossumf1dc5661993-07-05 10:31:29 +0000182 break;
183 }
Guido van Rossum85a5fbb1990-10-14 12:07:46 +0000184 signal(SIGINT, intcatcher);
Guido van Rossum86bea461997-04-29 21:03:06 +0000185 Py_AddPendingCall(PyErr_CheckSignals, NULL);
Guido van Rossum85a5fbb1990-10-14 12:07:46 +0000186}
187
Guido van Rossumaee094c1997-08-02 03:02:27 +0000188static RETSIGTYPE (*old_siginthandler)() = SIG_DFL;
189
Guido van Rossum85a5fbb1990-10-14 12:07:46 +0000190void
Guido van Rossum86bea461997-04-29 21:03:06 +0000191PyOS_InitInterrupts()
Guido van Rossum85a5fbb1990-10-14 12:07:46 +0000192{
Guido van Rossumaee094c1997-08-02 03:02:27 +0000193 if ((old_siginthandler = signal(SIGINT, SIG_IGN)) != SIG_IGN)
Guido van Rossum85a5fbb1990-10-14 12:07:46 +0000194 signal(SIGINT, intcatcher);
Guido van Rossum1d5735e1994-08-30 08:27:36 +0000195#ifdef HAVE_SIGINTERRUPT
Guido van Rossumacbe8da1993-04-15 15:33:52 +0000196 /* This is for SunOS and other modern BSD derivatives.
197 It means that system calls (like read()) are not restarted
198 after an interrupt. This is necessary so interrupting a
199 read() or readline() call works as expected.
200 XXX On old BSD (pure 4.2 or older) you may have to do this
201 differently! */
202 siginterrupt(SIGINT, 1);
Guido van Rossum1d5735e1994-08-30 08:27:36 +0000203#endif /* HAVE_SIGINTERRUPT */
Guido van Rossum85a5fbb1990-10-14 12:07:46 +0000204}
205
Guido van Rossumaee094c1997-08-02 03:02:27 +0000206void
207PyOS_FiniInterrupts()
208{
209 signal(SIGINT, old_siginthandler);
210}
211
Guido van Rossum85a5fbb1990-10-14 12:07:46 +0000212int
Guido van Rossum86bea461997-04-29 21:03:06 +0000213PyOS_InterruptOccurred()
Guido van Rossum85a5fbb1990-10-14 12:07:46 +0000214{
215 if (!interrupted)
216 return 0;
217 interrupted = 0;
218 return 1;
219}
220
221#endif /* !OK */