1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
|
/*
* libbrlapi - A library providing access to braille terminals for applications.
*
* Copyright (C) 2005-2025 by
* Alexis Robert <alexissoft@free.fr>
* Samuel Thibault <Samuel.Thibault@ens-lyon.org>
*
* libbrlapi comes with ABSOLUTELY NO WARRANTY.
*
* This is free software, placed under the terms of the
* GNU Lesser General Public License, as published by the Free Software
* Foundation; either version 2.1 of the License, or (at your option) any
* later version. Please see the file LICENSE-LGPL for details.
*
* Web Page: http://brltty.app/
*
* This software is maintained by Dave Mielke <dave@mielke.cc>.
*/
/* bindings.c provides initialized variables and brlapi exception handler to
* the Python bindings */
/* include Python.h first in order to prevent a redefine of _POSIX_C_SOURCE */
#include <Python.h>
#include "brlapi.h"
/* a kludge to get around a broken MinGW <pthread.h> header */
#ifdef __MINGW32__
#ifdef __struct_timespec_defined
#ifndef _TIMESPEC_DEFINED
#define _TIMESPEC_DEFINED
#endif /* _TIMESPEC_DEFINED */
#endif /* __struct_timespec_defined */
#endif /* __MINGW32__ */
#include <pthread.h>
#include <stdlib.h>
#include <string.h>
#include "bindings.h"
const brlapi_writeArguments_t brlapi_writeArguments_initialized = BRLAPI_WRITEARGUMENTS_INITIALIZER;
static pthread_once_t brlapi_protocolExceptionOnce = PTHREAD_ONCE_INIT;
static pthread_key_t brlapi_protocolExceptionKey;
static char *brlapi_protocolExceptionSingleThread;
#if defined(WINDOWS)
#elif defined(__GNUC__) || defined(__sun__)
#pragma weak pthread_once
#pragma weak pthread_key_create
#pragma weak pthread_getspecific
#pragma weak pthread_setspecific
#endif /* weak external references */
static void BRLAPI_STDCALL brlapi_pythonExceptionHandler(brlapi_handle_t *handle, int error, brlapi_packetType_t type, const void *packet, size_t size)
{
char str[128];
brlapi__strexception(handle, str, sizeof(str), error, type, packet, size);
#ifndef WINDOWS
if (!(pthread_once && pthread_key_create))
brlapi_protocolExceptionSingleThread = strdup(str);
else
#endif
pthread_setspecific(brlapi_protocolExceptionKey, strdup(str));
}
char *brlapi_protocolException(void)
{
char *exception;
#ifndef WINDOWS
if (!(pthread_once && pthread_key_create)) {
exception = brlapi_protocolExceptionSingleThread;
brlapi_protocolExceptionSingleThread = NULL;
return exception;
} else
#endif
{
exception = pthread_getspecific(brlapi_protocolExceptionKey);
pthread_setspecific(brlapi_protocolExceptionKey, NULL);
return exception;
}
}
static void do_brlapi_protocolExceptionInit(void)
{
pthread_key_create(&brlapi_protocolExceptionKey, free);
}
void brlapi_protocolExceptionInit(brlapi_handle_t *handle) {
#ifndef WINDOWS
if (pthread_once && pthread_key_create)
#endif /* WINDOWS */
pthread_once(&brlapi_protocolExceptionOnce, do_brlapi_protocolExceptionInit);
brlapi__setExceptionHandler(handle, &brlapi_pythonExceptionHandler);
}
/* brlapi_python_parameter_callback */
/* This is called from brlapi functions called by Python. We pass the callback
* data as such for brlapi.pyx' callback to translate them into python objects
*/
static void brlapi_python_parameter_callback(brlapi_param_t parameter, brlapi_param_subparam_t subparam, brlapi_param_flags_t flags, void *priv, const void *data, size_t len)
{
brlapi_python_paramCallbackDescriptor_t *descr = priv;
PyObject *arglist, *result;
PyGILState_STATE gstate;
brlapi_python_callbackData_t callbackData = {
.parameter = parameter,
.subparam = subparam,
.flags = flags,
.data = data,
.len = len,
};
gstate = PyGILState_Ensure();
arglist = Py_BuildValue("(L)", (long long) (uintptr_t) &callbackData);
result = PyObject_CallObject(descr->callback, arglist);
if (result != NULL)
Py_DECREF(result);
PyGILState_Release(gstate);
}
brlapi_python_paramCallbackDescriptor_t *brlapi_python_watchParameter(brlapi_handle_t *handle, brlapi_param_t param, brlapi_param_subparam_t subparam, brlapi_param_flags_t flags, PyObject *func)
{
brlapi_python_paramCallbackDescriptor_t *descr;
brlapi_paramCallbackDescriptor_t *brlapi_descr;
PyObject *result;
if (!PyCallable_Check(func)) {
PyErr_SetString(PyExc_TypeError, "parameter must be callable");
return NULL;
}
Py_INCREF(func);
descr = malloc(sizeof(*descr));
descr->callback = func;
brlapi_descr = brlapi__watchParameter(handle, param, subparam, flags, brlapi_python_parameter_callback, descr, NULL, 0);
if (!brlapi_descr) {
free(descr);
PyErr_SetString(PyExc_ValueError, "watching parameter failed");
return NULL;
}
descr->brlapi_descr = brlapi_descr;
return descr;
}
int brlapi_python_unwatchParameter(brlapi_handle_t *handle, brlapi_python_paramCallbackDescriptor_t *descr)
{
int ret;
ret = brlapi__unwatchParameter(handle, descr->brlapi_descr);
Py_DECREF(descr->callback);
free(descr);
return ret;
}
|
