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1 | /* -*-c-*- |
2 | * |
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3 | * $Id: txport.h,v 1.2 2002/01/30 09:27:10 mdw Exp $ |
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4 | * |
5 | * Transport switch glue |
6 | * |
7 | * (c) 2001 Mark Wooding |
8 | */ |
9 | |
10 | /*----- Licensing notice --------------------------------------------------* |
11 | * |
12 | * This file is part of Jog: Programming for a jogging machine. |
13 | * |
14 | * Jog is free software; you can redistribute it and/or modify |
15 | * it under the terms of the GNU General Public License as published by |
16 | * the Free Software Foundation; either version 2 of the License, or |
17 | * (at your option) any later version. |
18 | * |
19 | * Jog is distributed in the hope that it will be useful, |
20 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
21 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
22 | * GNU General Public License for more details. |
23 | * |
24 | * You should have received a copy of the GNU General Public License |
25 | * along with Jog; if not, write to the Free Software Foundation, |
26 | * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
27 | */ |
28 | |
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29 | #ifndef TXPORTSW_H |
30 | #define TXPORTSW_H |
31 | |
32 | #ifdef __cplusplus |
33 | extern "C" { |
34 | #endif |
35 | |
36 | /*----- Header files ------------------------------------------------------*/ |
37 | |
38 | #ifdef HAVE_CONFIG_H |
39 | # include "config.h" |
40 | #endif |
41 | |
42 | #include <stdarg.h> |
43 | #include <stddef.h> |
44 | |
45 | #include <pthread.h> |
46 | |
47 | #include <mLib/darray.h> |
48 | #include <mLib/lbuf.h> |
49 | |
50 | /*----- Data structures ---------------------------------------------------*/ |
51 | |
52 | /* --- Vector of bytes --- */ |
53 | |
54 | #ifndef UCHAR_V |
55 | # define UCHAR_V |
56 | DA_DECL(uchar_v, unsigned char); |
57 | #endif |
58 | |
59 | /* --- Node for lines --- */ |
60 | |
61 | typedef struct txline { |
62 | struct txline *next, *prev; /* Next node in the list */ |
63 | struct txport *tx; /* Owning transport */ |
64 | char *s; /* Pointer to the text */ |
65 | size_t len; /* Length of the string */ |
66 | } txline; |
67 | |
68 | /* --- A transport context --- * |
69 | * |
70 | * The only members for which there is contention are the state @s@ and the |
71 | * raw incoming buffer @buf@. Other members may be accessed without locking |
72 | * the structure. Thus, the thread messing about is essentially isolated to |
73 | * the data- fetching thread and the line buffering code. |
74 | */ |
75 | |
76 | typedef struct txport { |
77 | struct txport_ops *ops; /* Operations table */ |
78 | pthread_t tid; /* Fetching thread id */ |
79 | pthread_mutex_t mx; /* Lock for this structure */ |
80 | pthread_cond_t cv; /* `New data has arrived' */ |
81 | unsigned s; /* State of this transport */ |
82 | uchar_v buf; /* Buffer of incoming data */ |
83 | lbuf lb; /* Buffer for extracting lines */ |
84 | txline *ll, *ll_tail; /* List of waiting lines, in order */ |
85 | } txport; |
86 | |
87 | enum { |
88 | TX_READY, /* More data may arrive */ |
89 | TX_CLOSE, /* No more data will arrive */ |
90 | TX_CLOSED /* Done the closure thing already */ |
91 | }; |
92 | |
93 | /* --- Transport operations --- */ |
94 | |
95 | struct txfile { const char *env; const char *name; }; |
96 | |
97 | typedef struct txport_ops { |
98 | struct txport_ops *next; |
99 | const char *name; |
100 | const struct txfile *fv; |
101 | const char *config; |
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102 | txport *(*create)(const char */*file*/); |
103 | int (*configure)(txport */*tx*/, const char */*k*/, const char */*v*/); |
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104 | void *(*fetch)(void */*txv*/); |
105 | ssize_t (*write)(txport */*tx*/, const void */*p*/, size_t /*sz*/); |
106 | void (*destroy)(txport */*tx*/); |
107 | } txport_ops; |
108 | |
109 | /*----- Global variables --------------------------------------------------*/ |
110 | |
111 | extern txport_ops *txlist; |
112 | extern const char *txname; |
113 | extern const char *txfile; |
114 | extern const char *txconf; |
115 | |
116 | #define DIRVAR "JOGDIR" |
117 | |
118 | /*----- Functions provided ------------------------------------------------*/ |
119 | |
120 | /* --- @tx_create@ --- * |
121 | * |
122 | * Arguments: @const char *name@ = name of transport to instantiate |
123 | * @const char *file@ = filename for transport |
124 | * @const char *config@ = config string |
125 | * |
126 | * Returns: A pointer to the transport context, or null on error. |
127 | * |
128 | * Use: Creates a new transport. |
129 | */ |
130 | |
131 | extern txport *tx_create(const char */*name*/, const char */*file*/, |
132 | const char */*config*/); |
133 | |
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134 | /* --- @tx_configure@ --- * |
135 | * |
136 | * Arguments: @txport *tx@ = pointer to transport block |
137 | * @const char *config@ = config string |
138 | * |
139 | * Returns: Zero if OK, nonzero on errors. |
140 | * |
141 | * Use: Applies a configuration string to a transport. |
142 | */ |
143 | |
144 | extern int tx_configure(txport */*tx*/, const char */*config*/); |
145 | |
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146 | /* --- @tx_write@ --- * |
147 | * |
148 | * Arguments: @txport *tx@ = pointer to transport context |
149 | * @const void *p@ = pointer to buffer to write |
150 | * @size_t sz@ = size of buffer |
151 | * |
152 | * Returns: Zero if OK, or @-1@ on error. |
153 | * |
154 | * Use: Writes some data to a transport. |
155 | */ |
156 | |
157 | extern int tx_write(txport */*tx*/, const void */*p*/, size_t /*sz*/); |
158 | |
159 | /* --- @tx_printf@ --- * |
160 | * |
161 | * Arguments: @txport *tx@ = pointer to transport context |
162 | * @const char *p@ = pointer to string to write |
163 | * |
164 | * Returns: The number of characters printed, or @EOF@ on error. |
165 | * |
166 | * Use: Writes a textual message to a transport. |
167 | */ |
168 | |
169 | extern int tx_vprintf(txport */*tx*/, const char */*p*/, va_list */*ap*/); |
170 | |
171 | extern int tx_printf(txport */*tx*/, const char */*p*/, ...); |
172 | |
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173 | /* --- @tx_newline@ --- * |
174 | * |
175 | * Arguments: @txport *tx@ = pointer to transport context |
176 | * |
177 | * Returns: Zero if OK, nonzero on error. |
178 | * |
179 | * Use: Writes a newline (record boundary) to the output. |
180 | */ |
181 | |
182 | int tx_newline(txport */*tx*/); |
183 | |
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184 | /* --- @tx_read@, @tx_readx@ --- * |
185 | * |
186 | * Arguments: @txport *tx@ = pointer to transport context |
187 | * @unsigned long t@ = time to wait for data (ms) |
188 | * @int (*filter)(const char *s, void *p)@ = filtering function |
189 | * @void *p@ = pointer argument for filter |
190 | * |
191 | * Returns: A pointer to a line block, which must be freed using |
192 | * @tx_freeline@. |
193 | * |
194 | * Use: Fetches a line from the buffer. Each line is passed to the |
195 | * filter function in oldest-to-newest order; the filter |
196 | * function returns nonzero to choose a line. If no suitable |
197 | * line is waiting in the raw buffer, the program blocks while |
198 | * more data is fetched, until the time limit @t@ is exceeded, |
199 | * in which case a null pointer is returned. A null filter |
200 | * function is equivalent to one which always selects its line. |
201 | */ |
202 | |
203 | #define FOREVER (~0ul) |
204 | |
205 | extern txline *tx_readx(txport */*tx*/, unsigned long /*t*/, |
206 | int (*/*filter*/)(const char */*s*/, void */*p*/), |
207 | void */*p*/); |
208 | |
209 | extern txline *tx_read(txport */*tx*/, unsigned long /*t*/); |
210 | |
211 | /* --- @tx_freeline@ --- * |
212 | * |
213 | * Arguments: @txline *l@ = pointer to line |
214 | * |
215 | * Returns: --- |
216 | * |
217 | * Use: Frees a line block. |
218 | */ |
219 | |
220 | extern void tx_freeline(txline */*l*/); |
221 | |
222 | /* --- @tx_destroy@ --- * |
223 | * |
224 | * Arguments: @txport *tx@ = transport context |
225 | * |
226 | * Returns: --- |
227 | * |
228 | * Use: Destroys a transport. |
229 | */ |
230 | |
231 | extern void tx_destroy(txport */*tx*/); |
232 | |
233 | /*----- That's all, folks -------------------------------------------------*/ |
234 | |
235 | #ifdef __cplusplus |
236 | } |
237 | #endif |
238 | |
239 | #endif |