transmission/libtransmission/fdlimit.h

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// This file Copyright © 2005-2022 Mnemosyne LLC.
// It may be used under GPLv2 (SPDX: GPL-2.0), GPLv3 (SPDX: GPL-3.0),
// or any future license endorsed by Mnemosyne LLC.
// License text can be found in the licenses/ folder.
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#pragma once
#ifndef __TRANSMISSION__
#error only libtransmission should #include this header.
#endif
#include "transmission.h"
#include "file.h"
#include "net.h"
/**
* @addtogroup file_io File IO
* @{
*/
/***
****
***/
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/**
* Returns an fd to the specified filename.
*
* A small pool of open files is kept to avoid the overhead of
* continually opening and closing the same files when downloading
* piece data.
*
* - if do_write is true, subfolders in torrentFile are created if necessary.
* - if do_write is true, the target file is created if necessary.
*
* on success, a file descriptor >= 0 is returned.
* on failure, a TR_BAD_SYS_FILE is returned and errno is set.
*
* @see tr_fdFileClose
*/
tr_sys_file_t tr_fdFileCheckout(
tr_session* session,
int torrent_id,
tr_file_index_t file_num,
char const* filename,
bool do_write,
tr_preallocation_mode preallocation_mode,
uint64_t preallocation_file_size);
tr_sys_file_t tr_fdFileGetCached(tr_session* session, int torrent_id, tr_file_index_t file_num, bool doWrite);
/**
* Closes a file that's being held by our file repository.
*
* If the file isn't checked out, it's fsync()ed and close()d immediately.
* If the file is currently checked out, it will be closed upon its return.
*
* @see tr_fdFileCheckout
*/
void tr_fdFileClose(tr_session* session, tr_torrent const* tor, tr_file_index_t file_num);
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/**
* Closes all the files associated with a given torrent id
*/
void tr_fdTorrentClose(tr_session* session, int torrentId);
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/***********************************************************************
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* Sockets
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**********************************************************************/
tr_socket_t tr_fdSocketCreate(tr_session* session, int domain, int type);
tr_socket_t tr_fdSocketAccept(tr_session* session, tr_socket_t listening_sockfd, tr_address* addr, tr_port* port);
void tr_fdSocketClose(tr_session* session, tr_socket_t s);
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/***********************************************************************
* tr_fdClose
***********************************************************************
* Frees resources allocated by tr_fdInit.
**********************************************************************/
void tr_fdClose(tr_session* session);
/* @} */