1
2 /* Check for interrupts */
3
4 #include "Python.h"
5 #include "pythread.h"
6
7 #ifdef QUICKWIN
8
9 #include <io.h>
10
11 void
PyOS_InitInterrupts(void)12 PyOS_InitInterrupts(void)
13 {
14 }
15
16 void
PyOS_FiniInterrupts(void)17 PyOS_FiniInterrupts(void)
18 {
19 }
20
21 int
PyOS_InterruptOccurred(void)22 PyOS_InterruptOccurred(void)
23 {
24 _wyield();
25 }
26
27 #define OK
28
29 #endif /* QUICKWIN */
30
31 #if defined(_M_IX86) && !defined(__QNX__)
32 #include <io.h>
33 #endif
34
35 #if defined(MSDOS) && !defined(QUICKWIN)
36
37 #ifdef __GNUC__
38
39 /* This is for DJGPP's GO32 extender. I don't know how to trap
40 * control-C (There's no API for ctrl-C, and I don't want to mess with
41 * the interrupt vectors.) However, this DOES catch control-break.
42 * --Amrit
43 */
44
45 #include <go32.h>
46
47 void
PyOS_InitInterrupts(void)48 PyOS_InitInterrupts(void)
49 {
50 _go32_want_ctrl_break(1 /* TRUE */);
51 }
52
53 void
PyOS_FiniInterrupts(void)54 PyOS_FiniInterrupts(void)
55 {
56 }
57
58 int
PyOS_InterruptOccurred(void)59 PyOS_InterruptOccurred(void)
60 {
61 return _go32_was_ctrl_break_hit();
62 }
63
64 #else /* !__GNUC__ */
65
66 /* This might work for MS-DOS (untested though): */
67
68 void
PyOS_InitInterrupts(void)69 PyOS_InitInterrupts(void)
70 {
71 }
72
73 void
PyOS_FiniInterrupts(void)74 PyOS_FiniInterrupts(void)
75 {
76 }
77
78 int
PyOS_InterruptOccurred(void)79 PyOS_InterruptOccurred(void)
80 {
81 int interrupted = 0;
82 while (kbhit()) {
83 if (getch() == '\003')
84 interrupted = 1;
85 }
86 return interrupted;
87 }
88
89 #endif /* __GNUC__ */
90
91 #define OK
92
93 #endif /* MSDOS && !QUICKWIN */
94
95
96 #ifndef OK
97
98 /* Default version -- for real operating systems and for Standard C */
99
100 #include <stdio.h>
101 #include <string.h>
102 #include <signal.h>
103
104 static int interrupted;
105
106 void
PyErr_SetInterrupt(void)107 PyErr_SetInterrupt(void)
108 {
109 interrupted = 1;
110 }
111
112 extern int PyErr_CheckSignals(void);
113
114 static int
checksignals_witharg(void * arg)115 checksignals_witharg(void * arg)
116 {
117 return PyErr_CheckSignals();
118 }
119
120 static void
intcatcher(int sig)121 intcatcher(int sig)
122 {
123 extern void Py_Exit(int);
124 static char message[] =
125 "python: to interrupt a truly hanging Python program, interrupt once more.\n";
126 switch (interrupted++) {
127 case 0:
128 break;
129 case 1:
130 #ifdef RISCOS
131 fprintf(stderr, message);
132 #else
133 write(2, message, strlen(message));
134 #endif
135 break;
136 case 2:
137 interrupted = 0;
138 Py_Exit(1);
139 break;
140 }
141 PyOS_setsig(SIGINT, intcatcher);
142 Py_AddPendingCall(checksignals_witharg, NULL);
143 }
144
145 static void (*old_siginthandler)(int) = SIG_DFL;
146
147 void
PyOS_InitInterrupts(void)148 PyOS_InitInterrupts(void)
149 {
150 if ((old_siginthandler = PyOS_setsig(SIGINT, SIG_IGN)) != SIG_IGN)
151 PyOS_setsig(SIGINT, intcatcher);
152 }
153
154 void
PyOS_FiniInterrupts(void)155 PyOS_FiniInterrupts(void)
156 {
157 PyOS_setsig(SIGINT, old_siginthandler);
158 }
159
160 int
PyOS_InterruptOccurred(void)161 PyOS_InterruptOccurred(void)
162 {
163 if (!interrupted)
164 return 0;
165 interrupted = 0;
166 return 1;
167 }
168
169 #endif /* !OK */
170
171 void
PyOS_AfterFork(void)172 PyOS_AfterFork(void)
173 {
174 #ifdef WITH_THREAD
175 PyThread_ReInitTLS();
176 PyEval_ReInitThreads();
177 #endif
178 }
179