source: roaraudio/libroar/vio_pipe.c @ 5248:0133acb5ae31

Last change on this file since 5248:0133acb5ae31 was 4708:c9d40761088a, checked in by phi, 13 years ago

updated copyright statements

File size: 9.1 KB
Line 
1//vio_pipe.c:
2
3/*
4 *      Copyright (C) Philipp 'ph3-der-loewe' Schafft - 2009-2011
5 *
6 *  This file is part of libroar a part of RoarAudio,
7 *  a cross-platform sound system for both, home and professional use.
8 *  See README for details.
9 *
10 *  This file is free software; you can redistribute it and/or modify
11 *  it under the terms of the GNU General Public License version 3
12 *  as published by the Free Software Foundation.
13 *
14 *  libroar is distributed in the hope that it will be useful,
15 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
16 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
17 *  GNU General Public License for more details.
18 *
19 *  You should have received a copy of the GNU General Public License
20 *  along with this software; see the file COPYING.  If not, write to
21 *  the Free Software Foundation, 51 Franklin Street, Fifth Floor,
22 *  Boston, MA 02110-1301, USA.
23 *
24 *  NOTE for everyone want's to change something and send patches:
25 *  read README and HACKING! There a addition information on
26 *  the license of this document you need to read before you send
27 *  any patches.
28 *
29 *  NOTE for uses of non-GPL (LGPL,...) software using libesd, libartsc
30 *  or libpulse*:
31 *  The libs libroaresd, libroararts and libroarpulse link this lib
32 *  and are therefore GPL. Because of this it may be illigal to use
33 *  them with any software that uses libesd, libartsc or libpulse*.
34 */
35
36#include "libroar.h"
37
38int roar_vio_open_pipe (struct roar_vio_calls * s0, struct roar_vio_calls * s1, int type, int flags) {
39#ifndef ROAR_WITHOUT_VIO_PIPE
40 struct roar_vio_pipe * self;
41 int                    rw = flags & (O_RDONLY|O_WRONLY|O_RDWR);
42
43 if ( s0 == NULL || s1 == NULL )
44  return -1;
45
46 if ( (self = roar_mm_malloc(sizeof(struct roar_vio_pipe))) == NULL )
47  return -1;
48
49 memset(self, 0, sizeof(struct roar_vio_pipe));
50
51 self->refcount = 2;
52 self->flags    = flags;
53
54 if ( type == ROAR_VIO_PIPE_TYPE_AUTO ) {
55#ifdef ROAR_TARGET_WIN32
56  type = ROAR_VIO_PIPE_TYPE_BUFFER;
57#else
58  type = ROAR_VIO_PIPE_TYPE_SOCKET;
59#endif
60 }
61
62 self->type     = type;
63
64 switch (type) {
65  case ROAR_VIO_PIPE_TYPE_BUFFER:
66    // no buffers need to be set up here,
67    // we handle the NULL pointer in the reader and writer func
68    roar_mm_free(self);
69    return -1;
70   break;
71  case ROAR_VIO_PIPE_TYPE_PIPE:
72    self->b.p[0] = self->b.p[1] = self->b.p[2] = self->b.p[3] = -1;
73
74    if ( rw == O_RDWR || rw == O_RDONLY )
75     if ( pipe(self->b.p) == -1 ) {
76      roar_mm_free(self);
77      return -1;
78     }
79    if ( rw == O_RDWR || rw == O_WRONLY )
80     if ( pipe((self->b.p) + 2) == -1 ) {
81      close(self->b.p[0]);
82      close(self->b.p[1]);
83      roar_mm_free(self);
84      return -1;
85     }
86   break;
87#ifdef ROAR_HAVE_UNIX
88  case ROAR_VIO_PIPE_TYPE_SOCKET:
89    if ( socketpair(AF_UNIX, SOCK_STREAM, 0, self->b.p) == -1 ) {
90     roar_mm_free(self);
91     return -1;
92    }
93
94    if ( rw == O_RDONLY ) {
95     ROAR_SHUTDOWN(self->b.p[0], SHUT_WR);
96     ROAR_SHUTDOWN(self->b.p[1], SHUT_RD);
97    } else if ( rw == O_WRONLY ) {
98     ROAR_SHUTDOWN(self->b.p[0], SHUT_RD);
99     ROAR_SHUTDOWN(self->b.p[1], SHUT_WR);
100    }
101   break;
102#endif
103  default:
104    roar_mm_free(self);
105    return -1;
106 }
107
108 roar_vio_pipe_init(s0, self, flags);
109 roar_vio_pipe_init(s1, self, flags);
110
111 self->s0 = s0;
112
113 return 0;
114#else
115 return -1;
116#endif
117}
118
119#ifndef ROAR_WITHOUT_VIO_PIPE
120int roar_vio_pipe_init (struct roar_vio_calls * s,  struct roar_vio_pipe * self, int flags) {
121 if ( s == NULL || self == NULL )
122  return -1;
123
124 memset(s, 0, sizeof(struct roar_vio_calls));
125
126 s->close    = roar_vio_pipe_close;
127 s->read     = roar_vio_pipe_read;
128 s->write    = roar_vio_pipe_write;
129 s->nonblock = roar_vio_pipe_nonblock;
130 s->sync     = roar_vio_pipe_sync;
131
132 s->inst = (void*) self;
133
134 if ( flags & O_NONBLOCK ) {
135  roar_vio_pipe_nonblock(s, ROAR_SOCKET_NONBLOCK);
136 }
137
138 return 0;
139}
140
141int     roar_vio_pipe_close   (struct roar_vio_calls * vio) {
142 struct roar_vio_pipe * self;
143 int                    idx;
144
145 if ( vio == NULL )
146  return -1;
147
148 if ( (self = (struct roar_vio_pipe *)vio->inst) == NULL )
149  return -1;
150
151 self->refcount--;
152
153 switch (self->type) {
154  case ROAR_VIO_PIPE_TYPE_BUFFER:
155    // this will be a bit more complex as we need to change the flags, too.
156   break;
157  case ROAR_VIO_PIPE_TYPE_PIPE:
158   switch (ROAR_VIO_PIPE_S(self, vio)) {
159    case 0:
160      close(self->b.p[0]);
161      close(self->b.p[3]);
162      self->b.p[0] = -1;
163      self->b.p[3] = -1;
164     break;
165    case 1:
166      close(self->b.p[1]);
167      close(self->b.p[2]);
168      self->b.p[1] = -1;
169      self->b.p[2] = -1;
170     break;
171   }
172   break;
173#ifdef ROAR_HAVE_UNIX
174  case ROAR_VIO_PIPE_TYPE_SOCKET:
175    close(self->b.p[idx = ROAR_VIO_PIPE_S(self, vio)]);
176    self->b.p[idx] = -1;
177   break;
178#endif
179 }
180
181 if ( ! self->refcount ) {
182  roar_mm_free(self);
183 }
184
185 vio->inst = NULL;
186 return 0;
187}
188
189int     roar_vio_pipe_nonblock(struct roar_vio_calls * vio, int state) {
190 struct roar_vio_pipe * self;
191
192 if ( vio == NULL )
193  return -1;
194
195 if ( (self = (struct roar_vio_pipe *)vio->inst) == NULL )
196  return -1;
197
198 switch (self->type) {
199  case ROAR_VIO_PIPE_TYPE_PIPE:
200    if ( roar_socket_nonblock(self->b.p[ROAR_VIO_PIPE_S(self,vio)*2], state) == -1 )
201     return -1;
202    return roar_socket_nonblock(self->b.p[(ROAR_VIO_PIPE_SR(self,vio)*2)+1], state);
203   break;
204#ifdef ROAR_HAVE_UNIX
205  case ROAR_VIO_PIPE_TYPE_SOCKET:
206    return roar_socket_nonblock(self->b.p[ROAR_VIO_PIPE_S(self,vio)], state);
207   break;
208#endif
209 }
210
211 return -1;
212}
213
214int     roar_vio_pipe_sync    (struct roar_vio_calls * vio) {
215 // we may add fdatasync() calls here depending on the type
216 // but in general they should not be needed on pipes.
217 return 0;
218}
219
220int     roar_vio_pipe_ctl     (struct roar_vio_calls * vio, int cmd, void * data) {
221 struct roar_vio_pipe * self;
222
223 if (vio == NULL || cmd == -1)
224  return -1;
225
226 if ( (self = (struct roar_vio_pipe *)vio->inst) == NULL )
227  return -1;
228
229 switch (cmd) {
230  case ROAR_VIO_CTL_GET_NAME:
231    if ( data == NULL )
232     return -1;
233
234    *(char**)data = "pipe";
235    return 0;
236   break;
237  case ROAR_VIO_CTL_GET_FH:
238  case ROAR_VIO_CTL_GET_SELECT_FH:
239#ifdef ROAR_HAVE_UNIX
240    if ( self->type == ROAR_VIO_PIPE_TYPE_SOCKET ) {
241     *(int*)data = self->b.p[ROAR_VIO_PIPE_S(self,vio)];
242     return 0;
243    } else {
244     return -1;
245    }
246#else
247    return -1;
248#endif
249   break;
250  case ROAR_VIO_CTL_GET_READ_FH:
251  case ROAR_VIO_CTL_GET_SELECT_READ_FH:
252    switch (self->type) {
253#ifdef ROAR_HAVE_UNIX
254     case ROAR_VIO_PIPE_TYPE_SOCKET:
255       *(int*)data = self->b.p[ROAR_VIO_PIPE_S(self,vio)];
256       return 0;
257      break;
258#endif
259     case ROAR_VIO_PIPE_TYPE_PIPE:
260       *(int*)data = self->b.p[ROAR_VIO_PIPE_S(self,vio)*2];
261       return 0;
262      break;
263    }
264  case ROAR_VIO_CTL_GET_WRITE_FH:
265  case ROAR_VIO_CTL_GET_SELECT_WRITE_FH:
266    switch (self->type) {
267#ifdef ROAR_HAVE_UNIX
268     case ROAR_VIO_PIPE_TYPE_SOCKET:
269       *(int*)data = self->b.p[ROAR_VIO_PIPE_S(self,vio)];
270       return 0;
271      break;
272#endif
273     case ROAR_VIO_PIPE_TYPE_PIPE:
274       *(int*)data = self->b.p[(ROAR_VIO_PIPE_SR(self,vio)*2)+1];
275       return 0;
276      break;
277    }
278   break;
279 }
280
281 return -1;
282}
283
284
285ssize_t roar_vio_pipe_read    (struct roar_vio_calls * vio, void *buf, size_t count) {
286 struct roar_vio_pipe * self;
287 int                    idx;
288
289 if ( vio == NULL )
290  return -1;
291
292 if ( (self = (struct roar_vio_pipe *)vio->inst) == NULL )
293  return -1;
294
295 switch (self->type) {
296  case ROAR_VIO_PIPE_TYPE_BUFFER:
297    idx = ROAR_VIO_PIPE_S(self,vio);
298
299    if ( (idx == 0 ? O_WRONLY : O_RDONLY) == (self->flags & (O_RDONLY|O_WRONLY|O_RDWR)) ) {
300     raise(SIGPIPE);
301     return -1;
302    }
303
304    if ( self->b.b[idx] == NULL )
305     return 0;
306
307    if ( roar_buffer_shift_out(&(self->b.b[idx]), buf, &count) == -1 )
308     return -1;
309
310    return count;
311   break;
312  case ROAR_VIO_PIPE_TYPE_PIPE:
313    return read(self->b.p[ROAR_VIO_PIPE_S(self,vio)*2], buf, count);
314   break;
315#ifdef ROAR_HAVE_UNIX
316  case ROAR_VIO_PIPE_TYPE_SOCKET:
317    return read(self->b.p[ROAR_VIO_PIPE_S(self,vio)], buf, count);
318   break;
319#endif
320 }
321
322 return -1;
323}
324
325ssize_t roar_vio_pipe_write   (struct roar_vio_calls * vio, void *buf, size_t count) {
326 struct roar_vio_pipe * self;
327 struct roar_buffer   * next;
328 void                 * data;
329 int                    idx;
330
331 if ( vio == NULL )
332  return -1;
333
334 if ( (self = (struct roar_vio_pipe *)vio->inst) == NULL )
335  return -1;
336
337 switch (self->type) {
338  case ROAR_VIO_PIPE_TYPE_BUFFER:
339    if ( self->refcount < 2 ) {
340     raise(SIGPIPE);
341     return -1;
342    }
343
344    idx = ROAR_VIO_PIPE_SR(self,vio);
345
346    if ( (idx == 0 ? O_WRONLY : O_RDONLY) == (self->flags & (O_RDONLY|O_WRONLY|O_RDWR)) ) {
347     raise(SIGPIPE);
348     return -1;
349    }
350
351    if ( roar_buffer_new_data(&next, count, &data) == -1 )
352     return -1;
353
354    memcpy(data, buf, count);
355
356    if ( self->b.b[idx] == NULL ) {
357     self->b.b[idx] = next;
358    } else {
359     if ( roar_buffer_add(self->b.b[idx], next) == -1 ) {
360      roar_buffer_free(next);
361      return -1;
362     }
363    }
364
365    return count;
366   break;
367  case ROAR_VIO_PIPE_TYPE_PIPE:
368    return write(self->b.p[(ROAR_VIO_PIPE_SR(self,vio)*2)+1], buf, count);
369   break;
370#ifdef ROAR_HAVE_UNIX
371  case ROAR_VIO_PIPE_TYPE_SOCKET:
372    return write(self->b.p[ROAR_VIO_PIPE_S(self,vio)], buf, count);
373   break;
374#endif
375 }
376
377 return -1;
378}
379#endif
380
381//ll
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