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117 lines
4.7 KiB
C
117 lines
4.7 KiB
C
/* GStreamer
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* Copyright (C) <2009> Collabora Ltd
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* @author: Olivier Crete <olivier.crete@collabora.co.uk
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* Copyright (C) <2009> Nokia Inc
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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/*
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* None of this code is thread safe, if you want to use it in a
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* multi-threaded context, please protect it with a mutex.
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*
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* First, create a writer with sp_writer_create(), then select() on
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* the socket returned by sp_get_fd(). If the socket is closed or any
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* function returns an error, the app should call sp_close() and
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* assume the other side is dead. The writer calls
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* sp_writer_accept_client() when there is something to read from the
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* main server fd. This returns a new ShmClient (representing a client
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* connection), the writer needs to do a select() on the socket
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* returned by sp_writer_get_client_fd(). If it gets an error on that
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* socket, it calls sp_writer_close_client(). If there is something to
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* read, it calls sp_writer_recv().
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*
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* The writer allocates a block containing a free buffer with
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* sp_writer_alloc_block(), then writes something in the buffer
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* (retrieved with sp_writer_block_get_buf(), then calls
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* sp_writer_send_buf() to send the buffer or a subsection to the
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* other side. When it is done with the block, it calls
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* sp_writer_free_block(). If alloc fails, then the server must wait
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* for events on the client fd (the ones where sp_writer_recv() is
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* called), and then try to re-alloc.
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*
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* The reader (client) connect to the writer with sp_client_open() And
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* select()s on the fd from sp_get_fd() until there is something to
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* read. Then they must read using sp_client_recv() which will return
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* the size of the buffer (positive) if there is a valid buffer (which
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* is read only). It will return 0 if it is an internal message and a
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* negative number if there was an error. If there was an error, the
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* application must close the pipe with sp_close() and assume that all
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* buffers are no longer valid. If was valid buffer was received, the
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* client must release it with sp_client_recv_finish() when it is done
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* reading from it.
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*/
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#ifndef __SHMPIPE_H__
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#define __SHMPIPE_H__
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#include <stdlib.h>
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#include <stdint.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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typedef struct _ShmClient ShmClient;
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typedef struct _ShmPipe ShmPipe;
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typedef struct _ShmBlock ShmBlock;
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typedef struct _ShmBuffer ShmBuffer;
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ShmPipe *sp_writer_create (const char *path, size_t size, mode_t perms);
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const char *sp_writer_get_path (ShmPipe *pipe);
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void sp_close (ShmPipe * self);
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void *sp_get_data (ShmPipe * self);
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void sp_set_data (ShmPipe * self, void *data);
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int sp_writer_setperms_shm (ShmPipe * self, mode_t perms);
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int sp_writer_resize (ShmPipe * self, size_t size);
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int sp_get_fd (ShmPipe * self);
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int sp_writer_get_client_fd (ShmClient * client);
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ShmBlock *sp_writer_alloc_block (ShmPipe * self, size_t size);
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void sp_writer_free_block (ShmBlock *block);
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int sp_writer_send_buf (ShmPipe * self, char *buf, size_t size, uint64_t tag);
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char *sp_writer_block_get_buf (ShmBlock *block);
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ShmPipe *sp_writer_block_get_pipe (ShmBlock *block);
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ShmClient * sp_writer_accept_client (ShmPipe * self);
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void sp_writer_close_client (ShmPipe *self, ShmClient * client);
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int sp_writer_recv (ShmPipe * self, ShmClient * client);
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int sp_writer_pending_writes (ShmPipe * self);
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ShmPipe *sp_client_open (const char *path);
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long int sp_client_recv (ShmPipe * self, char **buf);
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int sp_client_recv_finish (ShmPipe * self, char *buf);
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ShmBuffer *sp_writer_get_pending_buffers (ShmPipe * self);
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ShmBuffer *sp_writer_get_next_buffer (ShmBuffer * buffer);
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uint64_t sp_writer_buf_get_tag (ShmBuffer * buffer);
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#ifdef __cplusplus
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}
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#endif
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#endif /* __SHMPIPE_H__ */
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