transmission/libtransmission/fdlimit.h

93 lines
3.5 KiB
C

/******************************************************************************
* $Id$
*
* Copyright (c) 2005-2008 Transmission authors and contributors
*
* 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.
*****************************************************************************/
#include "net.h"
/***********************************************************************
* tr_fdInit
***********************************************************************
* Detect the maximum number of open files and initializes things.
**********************************************************************/
void tr_fdInit( int globalPeerLimit );
void tr_fdClose( void );
/**
* Returns an fd to the specified filename.
*
* A small repository of open files is kept to avoid the overhead of continually
* opening and closing the same files when writing piece data during download.
* It's also used to ensure that only one client uses the file at a time.
* Clients must check out a file to use it, then return it, like a library, when done.
*
* if write is nonzero and dirname(filename) doesn't exist, dirname is created.
* if write is nonzero and filename doesn't exist, filename is created.
* returns the fd if successful; otherwise, one of TR_ERROR_IO_*
*
* @see tr_fdFileReturn
* @see tr_fdFileClose
*/
int tr_fdFileCheckout( const char * filename, int write );
/**
* Returns an fd from tr_fdFileCheckout() so that other clients may borrow it.
*
* @see tr_fdFileCheckout
* @see tr_fdFileClose
*/
void tr_fdFileReturn( int file );
/**
* Closes a file that's being held by our file repository.
*
* If the file isn't checked out, it's closed immediately.
* If the file is currently checked out, it will be closed upon its return.
*
* @see tr_fdFileCheckout
* @see tr_fdFileReturn
*/
void tr_fdFileClose( const char * filename );
/***********************************************************************
* Sockets
**********************************************************************/
int tr_fdSocketCreate( int type, int priority );
int tr_fdSocketAccept( int b, struct in_addr * addr, tr_port_t * port );
void tr_fdSocketClose( int s );
/***********************************************************************
* tr_fdClose
***********************************************************************
* Frees resources allocated by tr_fdInit.
**********************************************************************/
void tr_fdClose( void );
void tr_fdSetPeerLimit( uint16_t n );
uint16_t tr_fdGetPeerLimit( void );