*
* dvb_ringbuffer.h: ring buffer implementation for the dvb driver
*
- * Copyright (C) 2003 Oliver Endriss
+ * Copyright (C) 2003 Oliver Endriss
* Copyright (C) 2004 Andrew de Quincey
- *
+ *
* based on code originally found in av7110.c & dvb_ci.c:
* Copyright (C) 1999-2003 Ralph Metzler & Marcus Metzler
* for convergence integrated media GmbH
* modify it 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.
- *
+ *
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
- *
+ *
* You should have received a copy of the GNU Lesser General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
#include <linux/wait.h>
struct dvb_ringbuffer {
- u8 *data;
- ssize_t size;
- ssize_t pread;
- ssize_t pwrite;
-
- wait_queue_head_t queue;
- spinlock_t lock;
+ u8 *data;
+ ssize_t size;
+ ssize_t pread;
+ ssize_t pwrite;
+ int error;
+
+ wait_queue_head_t queue;
+ spinlock_t lock;
};
#define DVB_RINGBUFFER_PKTHDRSIZE 3
**
** *** write <buflen> bytes ***
** free = dvb_ringbuffer_free(rbuf);
-** if (free >= buflen)
+** if (free >= buflen)
** count = dvb_ringbuffer_write(rbuf, buffer, buflen);
** else
** ...
** else
** ...
**
-** (2) If there is exactly one reader and one writer, there is no need
+** (2) If there is exactly one reader and one writer, there is no need
** to lock read or write operations.
** Two or more readers must be locked against each other.
** Flushing the buffer counts as a read operation.
/* advance read ptr by <num> bytes */
#define DVB_RINGBUFFER_SKIP(rbuf,num) \
(rbuf)->pread=((rbuf)->pread+(num))%(rbuf)->size
-
+
/*
-** read <len> bytes from ring buffer into <buf>
+** read <len> bytes from ring buffer into <buf>
** <usermem> specifies whether <buf> resides in user space
** returns number of bytes transferred or -EFAULT
*/
-extern ssize_t dvb_ringbuffer_read(struct dvb_ringbuffer *rbuf, u8 *buf,
- size_t len, int usermem);
+extern ssize_t dvb_ringbuffer_read(struct dvb_ringbuffer *rbuf, u8 *buf,
+ size_t len, int usermem);
/* write routines & macros */
** returns number of bytes transferred or -EFAULT
*/
extern ssize_t dvb_ringbuffer_write(struct dvb_ringbuffer *rbuf, const u8 *buf,
- size_t len);
+ size_t len);
/**
* returns Number of bytes written, or -EFAULT, -ENOMEM, -EVINAL.
*/
extern ssize_t dvb_ringbuffer_pkt_write(struct dvb_ringbuffer *rbuf, u8* buf,
- size_t len);
+ size_t len);
/**
* Read from a packet in the ringbuffer. Note: unlike dvb_ringbuffer_read(), this
* returns Number of bytes read, or -EFAULT.
*/
extern ssize_t dvb_ringbuffer_pkt_read(struct dvb_ringbuffer *rbuf, size_t idx,
- int offset, u8* buf, size_t len, int usermem);
+ int offset, u8* buf, size_t len, int usermem);
/**
* Dispose of a packet in the ring buffer.