mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer.git
synced 2024-11-24 02:31:03 +00:00
111 lines
4.4 KiB
C
111 lines
4.4 KiB
C
/* GStreamer
|
|
* Copyright (C) <2009> Collabora Ltd
|
|
* @author: Olivier Crete <olivier.crete@collabora.co.uk
|
|
* Copyright (C) <2009> Nokia Inc
|
|
*
|
|
* Permission is hereby granted, free of charge, to any person obtaining a copy
|
|
* of this software and associated documentation files (the "Software"), to deal
|
|
* in the Software without restriction, including without limitation the rights
|
|
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
|
* copies of the Software, and to permit persons to whom the Software is
|
|
* furnished to do so, subject to the following conditions:
|
|
*
|
|
* The above copyright notice and this permission notice shall be included in
|
|
* all copies or substantial portions of the Software.
|
|
*
|
|
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
|
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
|
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
|
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
|
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
|
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
|
|
* THE SOFTWARE.
|
|
*/
|
|
|
|
/*
|
|
* None of this code is thread safe, if you want to use it in a
|
|
* multi-threaded context, please protect it with a mutex.
|
|
*
|
|
* First, create a writer with sp_writer_create(), then select() on
|
|
* the socket returned by sp_get_fd(). If the socket is closed or any
|
|
* function returns an error, the app should call sp_close() and
|
|
* assume the other side is dead. The writer calls
|
|
* sp_writer_accept_client() when there is something to read from the
|
|
* main server fd. This returns a new ShmClient (representing a client
|
|
* connection), the writer needs to do a select() on the socket
|
|
* returned by sp_writer_get_client_fd(). If it gets an error on that
|
|
* socket, it calls sp_writer_close_client(). If there is something to
|
|
* read, it calls sp_writer_recv().
|
|
*
|
|
* The writer allocates a block containing a free buffer with
|
|
* sp_writer_alloc_block(), then writes something in the buffer
|
|
* (retrieved with sp_writer_block_get_buf(), then calls
|
|
* sp_writer_send_buf() to send the buffer or a subsection to the
|
|
* other side. When it is done with the block, it calls
|
|
* sp_writer_free_block(). If alloc fails, then the server must wait
|
|
* for events on the client fd (the ones where sp_writer_recv() is
|
|
* called), and then try to re-alloc.
|
|
*
|
|
* The reader (client) connect to the writer with sp_client_open() And
|
|
* select()s on the fd from sp_get_fd() until there is something to
|
|
* read. Then they must read using sp_client_recv() which will return
|
|
* the size of the buffer (positive) if there is a valid buffer (which
|
|
* is read only). It will return 0 if it is an internal message and a
|
|
* negative number if there was an error. If there was an error, the
|
|
* application must close the pipe with sp_close() and assume that all
|
|
* buffers are no longer valid. If was valid buffer was received, the
|
|
* client must release it with sp_client_recv_finish() when it is done
|
|
* reading from it.
|
|
*/
|
|
|
|
|
|
#ifndef __SHMPIPE_H__
|
|
#define __SHMPIPE_H__
|
|
|
|
#include <stdlib.h>
|
|
#include <sys/types.h>
|
|
#include <sys/stat.h>
|
|
#include <fcntl.h>
|
|
|
|
|
|
#ifdef __cplusplus
|
|
extern "C" {
|
|
#endif
|
|
|
|
typedef struct _ShmClient ShmClient;
|
|
typedef struct _ShmPipe ShmPipe;
|
|
typedef struct _ShmBlock ShmBlock;
|
|
|
|
ShmPipe *sp_writer_create (const char *path, size_t size, mode_t perms);
|
|
const char *sp_writer_get_path (ShmPipe *pipe);
|
|
void sp_close (ShmPipe * self);
|
|
void *sp_get_data (ShmPipe * self);
|
|
void sp_set_data (ShmPipe * self, void *data);
|
|
|
|
int sp_writer_setperms_shm (ShmPipe * self, mode_t perms);
|
|
int sp_writer_resize (ShmPipe * self, size_t size);
|
|
|
|
int sp_get_fd (ShmPipe * self);
|
|
int sp_writer_get_client_fd (ShmClient * client);
|
|
|
|
ShmBlock *sp_writer_alloc_block (ShmPipe * self, size_t size);
|
|
void sp_writer_free_block (ShmBlock *block);
|
|
int sp_writer_send_buf (ShmPipe * self, char *buf, size_t size);
|
|
char *sp_writer_block_get_buf (ShmBlock *block);
|
|
ShmPipe *sp_writer_block_get_pipe (ShmBlock *block);
|
|
|
|
ShmClient * sp_writer_accept_client (ShmPipe * self);
|
|
void sp_writer_close_client (ShmPipe *self, ShmClient * client);
|
|
int sp_writer_recv (ShmPipe * self, ShmClient * client);
|
|
|
|
int sp_writer_pending_writes (ShmPipe * self);
|
|
|
|
ShmPipe *sp_client_open (const char *path);
|
|
long int sp_client_recv (ShmPipe * self, char **buf);
|
|
int sp_client_recv_finish (ShmPipe * self, char *buf);
|
|
|
|
#ifdef __cplusplus
|
|
}
|
|
#endif
|
|
|
|
#endif /* __SHMPIPE_H__ */
|