mirror of
https://github.com/transmission/transmission
synced 2024-12-25 17:17:31 +00:00
499 lines
12 KiB
C
499 lines
12 KiB
C
/******************************************************************************
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* $Id$
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*
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* Copyright (c) 2005-2008 Transmission authors and contributors
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is 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
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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* DEALINGS IN THE SOFTWARE.
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*****************************************************************************/
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#ifndef WIN32
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#define HAVE_GETRLIMIT
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#endif
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#include <assert.h>
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#include <errno.h>
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#include <inttypes.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#ifdef HAVE_GETRLIMIT
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#include <sys/time.h> /* getrlimit */
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#include <sys/resource.h> /* getrlimit */
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#endif
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#include <unistd.h>
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#include <libgen.h> /* dirname */
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#include <fcntl.h> /* O_LARGEFILE */
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#include <event.h>
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#include <evutil.h>
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#include "transmission.h"
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#include "list.h"
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#include "net.h"
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#include "platform.h" /* tr_lock */
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#include "trcompat.h" /* strlcpy */
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#include "utils.h"
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#if SIZEOF_VOIDP==8
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#define TR_UINT_TO_PTR(i) (void*)((uint64_t)i)
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#else
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#define TR_UINT_TO_PTR(i) ((void*)((uint32_t)i))
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#endif
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#define dbgmsg(fmt...) tr_deepLog( __FILE__, __LINE__, NULL, ##fmt )
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/**
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***
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**/
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enum
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{
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TR_MAX_OPEN_FILES = 16, /* real files, not sockets */
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NOFILE_BUFFER = 512, /* the process' number of open files is
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globalMaxPeers + NOFILE_BUFFER */
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};
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struct tr_openfile
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{
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unsigned int isCheckedOut : 1;
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unsigned int isWritable : 1;
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unsigned int closeWhenDone : 1;
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char filename[MAX_PATH_LENGTH];
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int fd;
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uint64_t date;
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};
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struct tr_fd_s
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{
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int reserved;
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int normal;
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int normalMax;
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tr_lock * lock;
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struct tr_openfile open[TR_MAX_OPEN_FILES];
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};
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static struct tr_fd_s * gFd = NULL;
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/***
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****
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**** Local Files
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****
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***/
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static tr_errno
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TrOpenFile( int i,
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const char * folder,
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const char * torrentFile,
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int write )
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{
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struct tr_openfile * file = &gFd->open[i];
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int flags;
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char filename[MAX_PATH_LENGTH];
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struct stat sb;
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/* confirm the parent folder exists */
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if( stat( folder, &sb ) || !S_ISDIR( sb.st_mode ) )
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return TR_ERROR_IO_PARENT;
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/* create subfolders, if any */
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tr_buildPath ( filename, sizeof(filename), folder, torrentFile, NULL );
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if( write ) {
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char * tmp = tr_strdup( filename );
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const int err = tr_mkdirp( dirname(tmp), 0777 ) ? errno : 0;
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tr_free( tmp );
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if( err )
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return tr_ioErrorFromErrno( err );
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}
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/* open the file */
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flags = write ? (O_RDWR | O_CREAT) : O_RDONLY;
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#ifdef O_LARGEFILE
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flags |= O_LARGEFILE;
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#endif
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#ifdef WIN32
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flags |= O_BINARY;
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#endif
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file->fd = open( filename, flags, 0666 );
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if( file->fd == -1 ) {
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const int err = errno;
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tr_err( _( "Couldn't open \"%1$s\": %2$s" ), filename, tr_strerror(err) );
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return tr_ioErrorFromErrno( err );
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}
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return TR_OK;
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}
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static int
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fileIsOpen( const struct tr_openfile * o )
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{
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return o->fd >= 0;
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}
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static void
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TrCloseFile( int i )
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{
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struct tr_openfile * o = &gFd->open[i];
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assert( i >= 0 );
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assert( i < TR_MAX_OPEN_FILES );
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assert( fileIsOpen( o ) );
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close( o->fd );
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o->fd = -1;
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o->isCheckedOut = 0;
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}
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static int
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fileIsCheckedOut( const struct tr_openfile * o )
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{
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return fileIsOpen(o) && o->isCheckedOut;
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}
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int
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tr_fdFileCheckout( const char * folder,
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const char * torrentFile,
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int write )
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{
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int i, winner = -1;
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struct tr_openfile * o;
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char filename[MAX_PATH_LENGTH];
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assert( folder && *folder );
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assert( torrentFile && *torrentFile );
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assert( write==0 || write==1 );
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tr_buildPath ( filename, sizeof(filename), folder, torrentFile, NULL );
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dbgmsg( "looking for file '%s', writable %c", filename, write?'y':'n' );
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tr_lockLock( gFd->lock );
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/* Is it already open? */
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for( i=0; i<TR_MAX_OPEN_FILES; ++i )
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{
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o = &gFd->open[i];
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if( !fileIsOpen( o ) )
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continue;
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if( strcmp( filename, o->filename ) )
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continue;
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if( fileIsCheckedOut( o ) ) {
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dbgmsg( "found it! it's open, but checked out. waiting..." );
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tr_lockUnlock( gFd->lock );
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tr_wait( 200 );
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tr_lockLock( gFd->lock );
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i = -1; /* reloop */
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continue;
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}
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if( write && !o->isWritable ) {
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dbgmsg( "found it! it's open and available, but isn't writable. closing..." );
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TrCloseFile( i );
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break;
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}
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dbgmsg( "found it! it's ready for use!" );
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winner = i;
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break;
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}
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dbgmsg( "it's not already open. looking for an open slot or an old file." );
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while( winner < 0 )
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{
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uint64_t date = tr_date( ) + 1;
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/* look for the file that's been open longest */
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for( i=0; i<TR_MAX_OPEN_FILES; ++i )
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{
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o = &gFd->open[i];
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if( !fileIsOpen( o ) ) {
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winner = i;
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dbgmsg( "found an empty slot in %d", winner );
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break;
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}
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if( date > o->date ) {
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date = o->date;
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winner = i;
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}
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}
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if( winner >= 0 ) {
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if( fileIsOpen( &gFd->open[winner] ) ) {
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dbgmsg( "closing file '%s', slot #%d", gFd->open[winner].filename, winner );
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TrCloseFile( winner );
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}
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} else {
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dbgmsg( "everything's full! waiting for someone else to finish something" );
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tr_lockUnlock( gFd->lock );
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tr_wait( 200 );
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tr_lockLock( gFd->lock );
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}
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}
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assert( winner >= 0 );
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o = &gFd->open[winner];
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if( !fileIsOpen( o ) )
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{
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const tr_errno err = TrOpenFile( winner, folder, torrentFile, write );
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if( err ) {
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tr_lockUnlock( gFd->lock );
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return err;
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}
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dbgmsg( "opened '%s' in slot %d, write %c", filename, winner, write?'y':'n' );
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strlcpy( o->filename, filename, sizeof( o->filename ) );
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o->isWritable = write;
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}
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dbgmsg( "checking out '%s' in slot %d", filename, winner );
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o->isCheckedOut = 1;
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o->closeWhenDone = 0;
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o->date = tr_date( );
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tr_lockUnlock( gFd->lock );
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return o->fd;
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}
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void
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tr_fdFileReturn( int fd )
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{
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int i;
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tr_lockLock( gFd->lock );
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for( i=0; i<TR_MAX_OPEN_FILES; ++i )
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{
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struct tr_openfile * o = &gFd->open[i];
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if( o->fd != fd )
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continue;
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dbgmsg( "releasing file '%s' in slot #%d", o->filename, i );
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o->isCheckedOut = 0;
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if( o->closeWhenDone )
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TrCloseFile( i );
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break;
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}
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tr_lockUnlock( gFd->lock );
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}
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void
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tr_fdFileClose( const char * filename )
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{
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int i;
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tr_lockLock( gFd->lock );
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for( i=0; i<TR_MAX_OPEN_FILES; ++i )
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{
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struct tr_openfile * o = &gFd->open[i];
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if( !fileIsOpen(o) || strcmp(filename,o->filename) )
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continue;
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dbgmsg( "tr_fdFileClose closing '%s'", filename );
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if( !o->isCheckedOut ) {
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dbgmsg( "not checked out, so closing it now... '%s'", filename );
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TrCloseFile( i );
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} else {
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dbgmsg( "flagging file '%s', slot #%d to be closed when checked in", gFd->open[i].filename, i );
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o->closeWhenDone = 1;
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}
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}
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tr_lockUnlock( gFd->lock );
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}
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/***
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****
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**** Sockets
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****
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***/
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static tr_list * reservedSockets = NULL;
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static void
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setSocketPriority( int fd, int isReserved )
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{
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if( isReserved )
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tr_list_append( &reservedSockets, TR_UINT_TO_PTR(fd) );
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}
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static int
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socketWasReserved( int fd )
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{
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return tr_list_remove_data( &reservedSockets, TR_UINT_TO_PTR(fd) ) != NULL;
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}
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static int
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getSocketMax( struct tr_fd_s * gFd )
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{
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return gFd->normalMax;
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}
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int
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tr_fdSocketCreate( int type, int isReserved )
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{
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int s = -1;
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tr_lockLock( gFd->lock );
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if( isReserved || ( gFd->normal < getSocketMax( gFd ) ) )
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if( ( s = socket( AF_INET, type, 0 ) ) < 0 )
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tr_err( _( "Couldn't create socket: %s" ), tr_strerror( sockerrno ) );
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if( s > -1 )
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{
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setSocketPriority( s, isReserved );
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if( isReserved )
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++gFd->reserved;
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else
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++gFd->normal;
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}
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assert( gFd->reserved >= 0 );
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assert( gFd->normal >= 0 );
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tr_lockUnlock( gFd->lock );
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return s;
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}
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int
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tr_fdSocketAccept( int b, struct in_addr * addr, tr_port_t * port )
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{
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int s = -1;
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unsigned int len;
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struct sockaddr_in sock;
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assert( addr != NULL );
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assert( port != NULL );
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tr_lockLock( gFd->lock );
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if( gFd->normal < getSocketMax( gFd ) )
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{
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len = sizeof( sock );
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s = accept( b, (struct sockaddr *) &sock, &len );
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}
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if( s > -1 )
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{
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setSocketPriority( s, FALSE );
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*addr = sock.sin_addr;
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*port = sock.sin_port;
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gFd->normal++;
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}
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tr_lockUnlock( gFd->lock );
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return s;
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}
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static void
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socketClose( int fd )
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{
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#ifdef BEOS_NETSERVER
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closesocket( fd );
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#else
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EVUTIL_CLOSESOCKET( fd );
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#endif
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}
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void
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tr_fdSocketClose( int s )
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{
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tr_lockLock( gFd->lock );
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if( s >= 0 ) {
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socketClose( s );
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if( socketWasReserved( s ) )
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--gFd->reserved;
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else
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--gFd->normal;
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}
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assert( gFd->reserved >= 0 );
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assert( gFd->normal >= 0 );
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tr_lockUnlock( gFd->lock );
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}
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/***
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****
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**** Startup / Shutdown
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****
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***/
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void
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tr_fdInit( int globalPeerLimit )
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{
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int i;
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assert( gFd == NULL );
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gFd = tr_new0( struct tr_fd_s, 1 );
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gFd->lock = tr_lockNew( );
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#ifdef HAVE_GETRLIMIT
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{
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struct rlimit rlim;
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getrlimit( RLIMIT_NOFILE, &rlim );
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rlim.rlim_cur = MIN( rlim.rlim_max,
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(rlim_t)(globalPeerLimit + NOFILE_BUFFER) );
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setrlimit( RLIMIT_NOFILE, &rlim );
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gFd->normalMax = rlim.rlim_cur - NOFILE_BUFFER;
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tr_dbg( "setrlimit( RLIMIT_NOFILE, %d )", (int)rlim.rlim_cur );
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}
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#else
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gFd->normalMax = globalPeerLimit;
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#endif
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tr_dbg( "%d usable file descriptors", globalPeerLimit );
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for( i=0; i<TR_MAX_OPEN_FILES; ++i )
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gFd->open[i].fd = -1;
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}
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void
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tr_fdClose( void )
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{
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int i = 0;
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for( i=0; i<TR_MAX_OPEN_FILES; ++i )
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if( fileIsOpen( &gFd->open[i] ) )
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TrCloseFile( i );
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tr_lockFree( gFd->lock );
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tr_list_free( &reservedSockets, NULL );
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tr_free( gFd );
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}
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void
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tr_fdSetPeerLimit( uint16_t n )
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{
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assert( gFd!=NULL && "tr_fdInit() must be called first!" );
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gFd->normalMax = n;
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}
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uint16_t
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tr_fdGetPeerLimit( void )
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{
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return gFd ? gFd->normalMax : -1;
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}
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