Guido van Rossum | f70e43a | 1991-02-19 12:39:46 +0000 | [diff] [blame] | 1 | /*********************************************************** |
Guido van Rossum | b9f8d6e | 1995-01-04 19:08:09 +0000 | [diff] [blame] | 2 | Copyright 1991-1995 by Stichting Mathematisch Centrum, Amsterdam, |
| 3 | The Netherlands. |
Guido van Rossum | f70e43a | 1991-02-19 12:39:46 +0000 | [diff] [blame] | 4 | |
| 5 | All Rights Reserved |
| 6 | |
Guido van Rossum | d266eb4 | 1996-10-25 14:44:06 +0000 | [diff] [blame] | 7 | Permission to use, copy, modify, and distribute this software and its |
| 8 | documentation for any purpose and without fee is hereby granted, |
Guido van Rossum | f70e43a | 1991-02-19 12:39:46 +0000 | [diff] [blame] | 9 | provided that the above copyright notice appear in all copies and that |
Guido van Rossum | d266eb4 | 1996-10-25 14:44:06 +0000 | [diff] [blame] | 10 | both that copyright notice and this permission notice appear in |
Guido van Rossum | f70e43a | 1991-02-19 12:39:46 +0000 | [diff] [blame] | 11 | supporting documentation, and that the names of Stichting Mathematisch |
Guido van Rossum | d266eb4 | 1996-10-25 14:44:06 +0000 | [diff] [blame] | 12 | Centrum or CWI or Corporation for National Research Initiatives or |
| 13 | CNRI not be used in advertising or publicity pertaining to |
| 14 | distribution of the software without specific, written prior |
| 15 | permission. |
Guido van Rossum | f70e43a | 1991-02-19 12:39:46 +0000 | [diff] [blame] | 16 | |
Guido van Rossum | d266eb4 | 1996-10-25 14:44:06 +0000 | [diff] [blame] | 17 | While CWI is the initial source for this software, a modified version |
| 18 | is made available by the Corporation for National Research Initiatives |
| 19 | (CNRI) at the Internet address ftp://ftp.python.org. |
| 20 | |
| 21 | STICHTING MATHEMATISCH CENTRUM AND CNRI DISCLAIM ALL WARRANTIES WITH |
| 22 | REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF |
| 23 | MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL STICHTING MATHEMATISCH |
| 24 | CENTRUM OR CNRI BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL |
| 25 | DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR |
| 26 | PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER |
| 27 | TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR |
| 28 | PERFORMANCE OF THIS SOFTWARE. |
Guido van Rossum | f70e43a | 1991-02-19 12:39:46 +0000 | [diff] [blame] | 29 | |
| 30 | ******************************************************************/ |
| 31 | |
Guido van Rossum | 85a5fbb | 1990-10-14 12:07:46 +0000 | [diff] [blame] | 32 | /* Check for interrupts */ |
| 33 | |
Guido van Rossum | 1d5735e | 1994-08-30 08:27:36 +0000 | [diff] [blame] | 34 | #include "config.h" |
Guido van Rossum | 1d5735e | 1994-08-30 08:27:36 +0000 | [diff] [blame] | 35 | #include "myproto.h" |
Guido van Rossum | 189e8f9 | 1992-01-19 16:29:05 +0000 | [diff] [blame] | 36 | #include "intrcheck.h" |
| 37 | |
Guido van Rossum | d6a15ad | 1991-06-24 22:30:42 +0000 | [diff] [blame] | 38 | |
Guido van Rossum | 1d5735e | 1994-08-30 08:27:36 +0000 | [diff] [blame] | 39 | #ifdef QUICKWIN |
| 40 | |
| 41 | #include <io.h> |
| 42 | |
| 43 | void |
| 44 | initintr() |
| 45 | { |
| 46 | } |
| 47 | |
| 48 | int |
| 49 | intrcheck() |
| 50 | { |
| 51 | _wyield(); |
| 52 | } |
| 53 | |
| 54 | #define OK |
| 55 | |
| 56 | #endif /* QUICKWIN */ |
| 57 | |
| 58 | #ifdef _M_IX86 |
| 59 | #include <io.h> |
| 60 | #endif |
| 61 | |
| 62 | #if defined(MSDOS) && !defined(QUICKWIN) |
| 63 | |
| 64 | #ifdef __GNUC__ |
| 65 | |
| 66 | /* This is for DJGPP's GO32 extender. I don't know how to trap |
| 67 | * control-C (There's no API for ctrl-C, and I don't want to mess with |
| 68 | * the interrupt vectors.) However, this DOES catch control-break. |
| 69 | * --Amrit |
| 70 | */ |
| 71 | |
| 72 | #include <go32.h> |
| 73 | |
| 74 | void |
| 75 | initintr() |
| 76 | { |
| 77 | _go32_want_ctrl_break(1 /* TRUE */); |
| 78 | } |
| 79 | |
| 80 | int |
| 81 | intrcheck() |
| 82 | { |
| 83 | return _go32_was_ctrl_break_hit(); |
| 84 | } |
| 85 | |
| 86 | #else /* !__GNUC__ */ |
Guido van Rossum | 85a5fbb | 1990-10-14 12:07:46 +0000 | [diff] [blame] | 87 | |
Guido van Rossum | 3f5da24 | 1990-12-20 15:06:42 +0000 | [diff] [blame] | 88 | /* This might work for MS-DOS (untested though): */ |
Guido van Rossum | 85a5fbb | 1990-10-14 12:07:46 +0000 | [diff] [blame] | 89 | |
| 90 | void |
| 91 | initintr() |
| 92 | { |
| 93 | } |
| 94 | |
| 95 | int |
| 96 | intrcheck() |
| 97 | { |
| 98 | int interrupted = 0; |
| 99 | while (kbhit()) { |
| 100 | if (getch() == '\003') |
| 101 | interrupted = 1; |
| 102 | } |
| 103 | return interrupted; |
| 104 | } |
| 105 | |
Guido van Rossum | 1d5735e | 1994-08-30 08:27:36 +0000 | [diff] [blame] | 106 | #endif /* __GNUC__ */ |
| 107 | |
Guido van Rossum | 85a5fbb | 1990-10-14 12:07:46 +0000 | [diff] [blame] | 108 | #define OK |
| 109 | |
Guido van Rossum | 1d5735e | 1994-08-30 08:27:36 +0000 | [diff] [blame] | 110 | #endif /* MSDOS && !QUICKWIN */ |
Guido van Rossum | 85a5fbb | 1990-10-14 12:07:46 +0000 | [diff] [blame] | 111 | |
| 112 | |
Guido van Rossum | d6a15ad | 1991-06-24 22:30:42 +0000 | [diff] [blame] | 113 | #ifdef macintosh |
Guido van Rossum | 85a5fbb | 1990-10-14 12:07:46 +0000 | [diff] [blame] | 114 | |
Jack Jansen | 9fc3989 | 1995-01-27 14:40:41 +0000 | [diff] [blame] | 115 | /* The Mac interrupt code has moved to macglue.c */ |
Guido van Rossum | 85a5fbb | 1990-10-14 12:07:46 +0000 | [diff] [blame] | 116 | #define OK |
| 117 | |
Guido van Rossum | d6a15ad | 1991-06-24 22:30:42 +0000 | [diff] [blame] | 118 | #endif /* macintosh */ |
Guido van Rossum | 85a5fbb | 1990-10-14 12:07:46 +0000 | [diff] [blame] | 119 | |
| 120 | |
| 121 | #ifndef OK |
| 122 | |
Guido van Rossum | 3f5da24 | 1990-12-20 15:06:42 +0000 | [diff] [blame] | 123 | /* Default version -- for real operating systems and for Standard C */ |
Guido van Rossum | 85a5fbb | 1990-10-14 12:07:46 +0000 | [diff] [blame] | 124 | |
| 125 | #include <stdio.h> |
Guido van Rossum | 1d5735e | 1994-08-30 08:27:36 +0000 | [diff] [blame] | 126 | #include <string.h> |
Guido van Rossum | 85a5fbb | 1990-10-14 12:07:46 +0000 | [diff] [blame] | 127 | #include <signal.h> |
Guido van Rossum | fd8a393 | 1996-12-02 18:27:33 +0000 | [diff] [blame] | 128 | #ifdef HAVE_UNISTD_H |
| 129 | #include <unistd.h> |
| 130 | #endif |
Guido van Rossum | 85a5fbb | 1990-10-14 12:07:46 +0000 | [diff] [blame] | 131 | |
Guido van Rossum | 62e376b | 1995-01-17 16:11:53 +0000 | [diff] [blame] | 132 | static int interrupted; |
Guido van Rossum | 85a5fbb | 1990-10-14 12:07:46 +0000 | [diff] [blame] | 133 | |
Guido van Rossum | 575d561 | 1995-03-10 15:13:03 +0000 | [diff] [blame] | 134 | void |
| 135 | PyErr_SetInterrupt() |
| 136 | { |
| 137 | interrupted = 1; |
| 138 | } |
| 139 | |
Guido van Rossum | ad74fa6 | 1997-01-21 06:00:33 +0000 | [diff] [blame] | 140 | extern int sigcheck(); |
| 141 | |
Guido van Rossum | df840d9 | 1992-03-27 17:29:44 +0000 | [diff] [blame] | 142 | /* ARGSUSED */ |
Guido van Rossum | 1d5735e | 1994-08-30 08:27:36 +0000 | [diff] [blame] | 143 | static RETSIGTYPE |
| 144 | #ifdef _M_IX86 |
| 145 | intcatcher(int sig) /* So the C compiler shuts up */ |
| 146 | #else /* _M_IX86 */ |
Guido van Rossum | 85a5fbb | 1990-10-14 12:07:46 +0000 | [diff] [blame] | 147 | intcatcher(sig) |
Guido van Rossum | df840d9 | 1992-03-27 17:29:44 +0000 | [diff] [blame] | 148 | int sig; /* Not used by required by interface */ |
Guido van Rossum | 1d5735e | 1994-08-30 08:27:36 +0000 | [diff] [blame] | 149 | #endif /* _M_IX86 */ |
Guido van Rossum | 85a5fbb | 1990-10-14 12:07:46 +0000 | [diff] [blame] | 150 | { |
Guido van Rossum | f1dc566 | 1993-07-05 10:31:29 +0000 | [diff] [blame] | 151 | extern void goaway PROTO((int)); |
| 152 | static char message[] = |
| 153 | "python: to interrupt a truly hanging Python program, interrupt once more.\n"; |
| 154 | switch (interrupted++) { |
| 155 | case 0: |
| 156 | break; |
| 157 | case 1: |
| 158 | write(2, message, strlen(message)); |
| 159 | break; |
| 160 | case 2: |
| 161 | interrupted = 0; |
| 162 | goaway(1); |
| 163 | break; |
| 164 | } |
Guido van Rossum | 85a5fbb | 1990-10-14 12:07:46 +0000 | [diff] [blame] | 165 | signal(SIGINT, intcatcher); |
Guido van Rossum | ad74fa6 | 1997-01-21 06:00:33 +0000 | [diff] [blame] | 166 | Py_AddPendingCall(sigcheck, NULL); |
Guido van Rossum | 85a5fbb | 1990-10-14 12:07:46 +0000 | [diff] [blame] | 167 | } |
| 168 | |
| 169 | void |
| 170 | initintr() |
| 171 | { |
| 172 | if (signal(SIGINT, SIG_IGN) != SIG_IGN) |
| 173 | signal(SIGINT, intcatcher); |
Guido van Rossum | 1d5735e | 1994-08-30 08:27:36 +0000 | [diff] [blame] | 174 | #ifdef HAVE_SIGINTERRUPT |
Guido van Rossum | acbe8da | 1993-04-15 15:33:52 +0000 | [diff] [blame] | 175 | /* This is for SunOS and other modern BSD derivatives. |
| 176 | It means that system calls (like read()) are not restarted |
| 177 | after an interrupt. This is necessary so interrupting a |
| 178 | read() or readline() call works as expected. |
| 179 | XXX On old BSD (pure 4.2 or older) you may have to do this |
| 180 | differently! */ |
| 181 | siginterrupt(SIGINT, 1); |
Guido van Rossum | 1d5735e | 1994-08-30 08:27:36 +0000 | [diff] [blame] | 182 | #endif /* HAVE_SIGINTERRUPT */ |
Guido van Rossum | 85a5fbb | 1990-10-14 12:07:46 +0000 | [diff] [blame] | 183 | } |
| 184 | |
| 185 | int |
| 186 | intrcheck() |
| 187 | { |
| 188 | if (!interrupted) |
| 189 | return 0; |
| 190 | interrupted = 0; |
| 191 | return 1; |
| 192 | } |
| 193 | |
| 194 | #endif /* !OK */ |