transmission/libtransmission/platform.c

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/*
* This file Copyright (C) Mnemosyne LLC
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*
* This file is licensed by the GPL version 2. Works owned by the
* Transmission project are granted a special exemption to clause 2(b)
* so that the bulk of its code can remain under the MIT license.
* This exemption does not extend to derived works not owned by
* the Transmission project.
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*
* $Id$
*/
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#ifdef WIN32
#include <w32api.h>
#define WINVER WindowsXP
#include <windows.h>
#include <shlobj.h> /* for CSIDL_APPDATA, CSIDL_MYDOCUMENTS */
#else
#ifdef SYS_DARWIN
#include <CoreFoundation/CoreFoundation.h>
#endif
#ifdef __HAIKU__
#include <FindDirectory.h>
#endif
#define _XOPEN_SOURCE 600 /* needed for recursive locks. */
#ifndef __USE_UNIX98
#define __USE_UNIX98 /* some older Linuxes need it spelt out for them */
#endif
#include <pthread.h>
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#endif
#include <assert.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#ifdef SYS_DARWIN
#define HAVE_SYS_STATVFS_H
#define HAVE_STATVFS
#endif
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#include <sys/stat.h>
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#include <sys/types.h>
#ifdef HAVE_SYS_STATVFS_H
#include <sys/statvfs.h>
#endif
#ifdef WIN32
#include <libgen.h>
#endif
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#include <dirent.h>
#include <fcntl.h>
#include <unistd.h> /* getuid getpid close */
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#include "transmission.h"
#include "session.h"
#include "list.h"
#include "platform.h"
#include "utils.h"
/***
**** THREADS
***/
#ifdef WIN32
typedef DWORD tr_thread_id;
#else
typedef pthread_t tr_thread_id;
#endif
static tr_thread_id
tr_getCurrentThread( void )
{
#ifdef WIN32
return GetCurrentThreadId( );
#else
return pthread_self( );
#endif
}
static bool
tr_areThreadsEqual( tr_thread_id a, tr_thread_id b )
{
#ifdef WIN32
return a == b;
#else
return pthread_equal( a, b ) != 0;
#endif
}
/** @brief portability wrapper around OS-dependent threads */
struct tr_thread
{
void ( * func )( void * );
void * arg;
tr_thread_id thread;
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#ifdef WIN32
HANDLE thread_handle;
#endif
};
bool
tr_amInThread( const tr_thread * t )
{
return tr_areThreadsEqual( tr_getCurrentThread( ), t->thread );
}
#ifdef WIN32
#define ThreadFuncReturnType unsigned WINAPI
#else
#define ThreadFuncReturnType void
#endif
static ThreadFuncReturnType
ThreadFunc( void * _t )
{
tr_thread * t = _t;
t->func( t->arg );
tr_free( t );
#ifdef WIN32
_endthreadex( 0 );
return 0;
#endif
}
tr_thread *
tr_threadNew( void ( *func )(void *),
void * arg )
{
tr_thread * t = tr_new0( tr_thread, 1 );
t->func = func;
t->arg = arg;
#ifdef WIN32
{
unsigned int id;
t->thread_handle =
(HANDLE) _beginthreadex( NULL, 0, &ThreadFunc, t, 0,
&id );
t->thread = (DWORD) id;
}
#else
pthread_create( &t->thread, NULL, (void*(*)(void*))ThreadFunc, t );
pthread_detach( t->thread );
#endif
return t;
}
/***
**** LOCKS
***/
/** @brief portability wrapper around OS-dependent thread mutexes */
struct tr_lock
{
int depth;
#ifdef WIN32
CRITICAL_SECTION lock;
DWORD lockThread;
#else
pthread_mutex_t lock;
pthread_t lockThread;
#endif
};
tr_lock*
tr_lockNew( void )
{
tr_lock * l = tr_new0( tr_lock, 1 );
#ifdef WIN32
InitializeCriticalSection( &l->lock ); /* supports recursion */
#else
pthread_mutexattr_t attr;
pthread_mutexattr_init( &attr );
pthread_mutexattr_settype( &attr, PTHREAD_MUTEX_RECURSIVE );
pthread_mutex_init( &l->lock, &attr );
#endif
return l;
}
void
tr_lockFree( tr_lock * l )
{
#ifdef WIN32
DeleteCriticalSection( &l->lock );
#else
pthread_mutex_destroy( &l->lock );
#endif
tr_free( l );
}
void
tr_lockLock( tr_lock * l )
{
#ifdef WIN32
EnterCriticalSection( &l->lock );
#else
pthread_mutex_lock( &l->lock );
#endif
assert( l->depth >= 0 );
if( l->depth )
assert( tr_areThreadsEqual( l->lockThread, tr_getCurrentThread( ) ) );
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l->lockThread = tr_getCurrentThread( );
++l->depth;
}
int
tr_lockHave( const tr_lock * l )
{
return ( l->depth > 0 )
&& ( tr_areThreadsEqual( l->lockThread, tr_getCurrentThread( ) ) );
}
void
tr_lockUnlock( tr_lock * l )
{
assert( l->depth > 0 );
assert( tr_areThreadsEqual( l->lockThread, tr_getCurrentThread( ) ) );
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--l->depth;
assert( l->depth >= 0 );
#ifdef WIN32
LeaveCriticalSection( &l->lock );
#else
pthread_mutex_unlock( &l->lock );
#endif
}
/***
**** PATHS
***/
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#ifndef WIN32
#include <pwd.h>
#endif
static const char *
getHomeDir( void )
{
static char * home = NULL;
if( !home )
{
home = tr_strdup( getenv( "HOME" ) );
if( !home )
{
#ifdef WIN32
char appdata[MAX_PATH]; /* SHGetFolderPath() requires MAX_PATH */
*appdata = '\0';
SHGetFolderPath( NULL, CSIDL_PERSONAL, NULL, 0, appdata );
home = tr_strdup( appdata );
#else
struct passwd * pw = getpwuid( getuid( ) );
if( pw )
home = tr_strdup( pw->pw_dir );
endpwent( );
#endif
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}
if( !home )
home = tr_strdup( "" );
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}
return home;
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}
static const char *
getOldConfigDir( void )
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{
static char * path = NULL;
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if( !path )
{
#ifdef SYS_DARWIN
path = tr_buildPath( getHomeDir( ), "Library",
"Application Support",
"Transmission", NULL );
#elif defined( WIN32 )
char appdata[MAX_PATH]; /* SHGetFolderPath() requires MAX_PATH */
SHGetFolderPath( NULL, CSIDL_APPDATA, NULL, 0, appdata );
path = tr_buildPath( appdata, "Transmission", NULL );
#elif defined( __HAIKU__ )
char buf[TR_PATH_MAX];
find_directory( B_USER_SETTINGS_DIRECTORY, -1, true, buf, sizeof(buf) );
path = tr_buildPath( buf, "Transmission", NULL );
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#else
path = tr_buildPath( getHomeDir( ), ".transmission", NULL );
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#endif
}
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return path;
}
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#if defined(SYS_DARWIN) || defined(WIN32)
#define RESUME_SUBDIR "Resume"
#define TORRENT_SUBDIR "Torrents"
#else
#define RESUME_SUBDIR "resume"
#define TORRENT_SUBDIR "torrents"
#endif
static const char *
getOldTorrentsDir( void )
{
static char * path = NULL;
if( !path )
path = tr_buildPath( getOldConfigDir( ), TORRENT_SUBDIR, NULL );
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return path;
}
static const char *
getOldCacheDir( void )
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{
static char * path = NULL;
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if( !path )
{
#if defined( WIN32 )
path = tr_buildPath( getOldConfigDir( ), "Cache", NULL );
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#elif defined( SYS_DARWIN )
path = tr_buildPath( getHomeDir( ), "Library", "Caches", "Transmission", NULL );
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#else
path = tr_buildPath( getOldConfigDir( ), "cache", NULL );
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#endif
}
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return path;
}
static void
moveFiles( const char * oldDir,
const char * newDir )
{
if( oldDir && newDir && strcmp( oldDir, newDir ) )
{
DIR * dirh = opendir( oldDir );
if( dirh )
{
int count = 0;
struct dirent * dirp;
while( ( dirp = readdir( dirh ) ) )
{
const char * name = dirp->d_name;
if( name && strcmp( name, "." ) && strcmp( name, ".." ) )
{
char * o = tr_buildPath( oldDir, name, NULL );
char * n = tr_buildPath( newDir, name, NULL );
rename( o, n );
++count;
tr_free( n );
tr_free( o );
}
}
if( count )
tr_inf( _( "Migrated %1$d files from \"%2$s\" to \"%3$s\"" ),
count, oldDir, newDir );
closedir( dirh );
}
}
}
/**
* This function is for transmission-gtk users to migrate the config files
* from $HOME/.transmission/ (where they were kept before Transmission 1.30)
* to $HOME/.config/$appname as per the XDG directory spec.
*/
static void
migrateFiles( const tr_session * session )
{
static int migrated = false;
const bool should_migrate = strstr( getOldConfigDir(), ".transmission" ) != NULL;
if( !migrated && should_migrate )
{
const char * oldDir;
const char * newDir;
migrated = true;
oldDir = getOldTorrentsDir( );
newDir = tr_getTorrentDir( session );
moveFiles( oldDir, newDir );
oldDir = getOldCacheDir( );
newDir = tr_getResumeDir( session );
moveFiles( oldDir, newDir );
}
}
void
tr_setConfigDir( tr_session * session, const char * configDir )
{
char * path;
session->configDir = tr_strdup( configDir );
path = tr_buildPath( configDir, RESUME_SUBDIR, NULL );
tr_mkdirp( path, 0777 );
session->resumeDir = path;
path = tr_buildPath( configDir, TORRENT_SUBDIR, NULL );
tr_mkdirp( path, 0777 );
session->torrentDir = path;
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migrateFiles( session );
}
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const char *
tr_sessionGetConfigDir( const tr_session * session )
{
return session->configDir;
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}
const char *
tr_getTorrentDir( const tr_session * session )
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{
return session->torrentDir;
}
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const char *
tr_getResumeDir( const tr_session * session )
{
return session->resumeDir;
}
const char*
tr_getDefaultConfigDir( const char * appname )
{
static char * s = NULL;
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if( !appname || !*appname )
appname = "Transmission";
if( !s )
{
if( ( s = getenv( "TRANSMISSION_HOME" ) ) )
{
s = tr_strdup( s );
}
else
{
#ifdef SYS_DARWIN
s = tr_buildPath( getHomeDir( ), "Library", "Application Support",
appname, NULL );
#elif defined( WIN32 )
char appdata[TR_PATH_MAX]; /* SHGetFolderPath() requires MAX_PATH */
SHGetFolderPath( NULL, CSIDL_APPDATA, NULL, 0, appdata );
s = tr_buildPath( appdata, appname, NULL );
#elif defined( __HAIKU__ )
char buf[TR_PATH_MAX];
find_directory( B_USER_SETTINGS_DIRECTORY, -1, true, buf, sizeof(buf) );
s = tr_buildPath( buf, appname, NULL );
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#else
if( ( s = getenv( "XDG_CONFIG_HOME" ) ) )
s = tr_buildPath( s, appname, NULL );
else
s = tr_buildPath( getHomeDir( ), ".config", appname, NULL );
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#endif
}
}
return s;
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}
const char*
tr_getDefaultDownloadDir( void )
{
static char * user_dir = NULL;
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if( user_dir == NULL )
{
const char * config_home;
char * config_file;
char * content;
size_t content_len;
/* figure out where to look for user-dirs.dirs */
config_home = getenv( "XDG_CONFIG_HOME" );
if( config_home && *config_home )
config_file = tr_buildPath( config_home, "user-dirs.dirs", NULL );
else
config_file = tr_buildPath( getHomeDir( ), ".config", "user-dirs.dirs", NULL );
/* read in user-dirs.dirs and look for the download dir entry */
content = (char *) tr_loadFile( config_file, &content_len );
if( content && content_len>0 )
{
const char * key = "XDG_DOWNLOAD_DIR=\"";
char * line = strstr( content, key );
if( line != NULL )
{
char * value = line + strlen( key );
char * end = strchr( value, '"' );
if( end )
{
*end = '\0';
if( !memcmp( value, "$HOME/", 6 ) )
user_dir = tr_buildPath( getHomeDir( ), value+6, NULL );
else
user_dir = tr_strdup( value );
}
}
}
if( user_dir == NULL )
#ifdef __HAIKU__
user_dir = tr_buildPath( getHomeDir( ), "Desktop", NULL );
#else
user_dir = tr_buildPath( getHomeDir( ), "Downloads", NULL );
#endif
tr_free( content );
tr_free( config_file );
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}
return user_dir;
}
/***
****
***/
static int
isWebClientDir( const char * path )
{
struct stat sb;
char * tmp = tr_buildPath( path, "index.html", NULL );
const int ret = !stat( tmp, &sb );
tr_inf( _( "Searching for web interface file \"%s\"" ), tmp );
tr_free( tmp );
return ret;
}
const char *
tr_getWebClientDir( const tr_session * session UNUSED )
{
static char * s = NULL;
if( !s )
{
if( ( s = getenv( "CLUTCH_HOME" ) ) )
{
s = tr_strdup( s );
}
else if( ( s = getenv( "TRANSMISSION_WEB_HOME" ) ) )
{
s = tr_strdup( s );
}
else
{
#ifdef SYS_DARWIN /* on Mac, look in the Application Support folder first, then in the app bundle. */
/* Look in the Application Support folder */
s = tr_buildPath( tr_sessionGetConfigDir( session ), "web", NULL );
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if( !isWebClientDir( s ) ) {
tr_free( s );
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CFURLRef appURL = CFBundleCopyBundleURL( CFBundleGetMainBundle( ) );
CFStringRef appRef = CFURLCopyFileSystemPath( appURL,
kCFURLPOSIXPathStyle );
const CFIndex appStringLength = CFStringGetMaximumSizeOfFileSystemRepresentation(appRef);
char * appString = tr_malloc( appStringLength );
const bool success = CFStringGetFileSystemRepresentation( appRef, appString, appStringLength );
assert( success );
CFRelease( appURL );
CFRelease( appRef );
/* Fallback to the app bundle */
s = tr_buildPath( appString, "Contents", "Resources", "web", NULL );
if( !isWebClientDir( s ) ) {
tr_free( s );
s = NULL;
}
tr_free( appString );
}
#elif defined( WIN32 )
/* SHGetFolderPath explicitly requires MAX_PATH length */
char dir[MAX_PATH];
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/* Generally, Web interface should be stored in a Web subdir of
* calling executable dir. */
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if( s == NULL ) {
/* First, we should check personal AppData/Transmission/Web */
SHGetFolderPath( NULL, CSIDL_COMMON_APPDATA, NULL, 0, dir );
s = tr_buildPath( dir, "Transmission", "Web", NULL );
if( !isWebClientDir( s ) ) {
tr_free( s );
s = NULL;
}
}
if( s == NULL ) {
/* check personal AppData */
SHGetFolderPath( NULL, CSIDL_APPDATA, NULL, 0, dir );
s = tr_buildPath( dir, "Transmission", "Web", NULL );
if( !isWebClientDir( s ) ) {
tr_free( s );
s = NULL;
}
}
if( s == NULL) {
/* check calling module place */
GetModuleFileName( GetModuleHandle( NULL ), dir, sizeof( dir ) );
s = tr_buildPath( dirname( dir ), "Web", NULL );
if( !isWebClientDir( s ) ) {
tr_free( s );
s = NULL;
}
}
#else /* everyone else, follow the XDG spec */
tr_list *candidates = NULL, *l;
const char * tmp;
/* XDG_DATA_HOME should be the first in the list of candidates */
tmp = getenv( "XDG_DATA_HOME" );
if( tmp && *tmp )
tr_list_append( &candidates, tr_strdup( tmp ) );
else {
char * dhome = tr_buildPath( getHomeDir( ), ".local", "share", NULL );
tr_list_append( &candidates, dhome );
}
/* XDG_DATA_DIRS are the backup directories */
{
const char * pkg = PACKAGE_DATA_DIR;
const char * xdg = getenv( "XDG_DATA_DIRS" );
const char * fallback = "/usr/local/share:/usr/share";
char * buf = tr_strdup_printf( "%s:%s:%s", (pkg?pkg:""), (xdg?xdg:""), fallback );
tmp = buf;
while( tmp && *tmp ) {
const char * end = strchr( tmp, ':' );
if( end ) {
if( ( end - tmp ) > 1 )
tr_list_append( &candidates, tr_strndup( tmp, end - tmp ) );
tmp = end + 1;
} else if( tmp && *tmp ) {
tr_list_append( &candidates, tr_strdup( tmp ) );
break;
}
}
tr_free( buf );
}
/* walk through the candidates & look for a match */
for( l=candidates; l; l=l->next ) {
char * path = tr_buildPath( l->data, "transmission", "web", NULL );
const int found = isWebClientDir( path );
if( found ) {
s = path;
break;
}
tr_free( path );
}
tr_list_free( &candidates, tr_free );
#endif
}
}
return s;
}
/***
****
***/
int64_t
tr_getFreeSpace( const char * path )
{
#ifdef WIN32
uint64_t freeBytesAvailable = 0;
return GetDiskFreeSpaceEx( path, &freeBytesAvailable, NULL, NULL)
? (int64_t)freeBytesAvailable
: -1;
#elif defined(HAVE_STATVFS)
struct statvfs buf;
return statvfs( path, &buf ) ? -1 : (int64_t)buf.f_bavail * (int64_t)buf.f_frsize;
#else
#warning FIXME: not implemented
return -1;
#endif
}
/***
****
***/
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#ifdef WIN32
/* The following mmap functions are by Joerg Walter, and were taken from
* his paper at: http://www.genesys-e.de/jwalter/mix4win.htm
*/
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#if defined(_MSC_VER)
__declspec( align( 4 ) ) static LONG volatile g_sl;
#else
static LONG volatile g_sl __attribute__ ( ( aligned ( 4 ) ) );
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#endif
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/* Wait for spin lock */
static int
slwait( LONG volatile *sl )
{
while( InterlockedCompareExchange ( sl, 1, 0 ) != 0 )
Sleep ( 0 );
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return 0;
}
/* Release spin lock */
static int
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slrelease( LONG volatile *sl )
{
InterlockedExchange ( sl, 0 );
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return 0;
}
/* getpagesize for windows */
static long
getpagesize( void )
{
static long g_pagesize = 0;
if( !g_pagesize )
{
SYSTEM_INFO system_info;
GetSystemInfo ( &system_info );
g_pagesize = system_info.dwPageSize;
}
return g_pagesize;
}
static long
getregionsize( void )
{
static long g_regionsize = 0;
if( !g_regionsize )
{
SYSTEM_INFO system_info;
GetSystemInfo ( &system_info );
g_regionsize = system_info.dwAllocationGranularity;
}
return g_regionsize;
}
void *
mmap( void *ptr,
long size,
long prot,
long type,
long handle,
long arg )
{
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static long g_pagesize;
static long g_regionsize;
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/* Wait for spin lock */
slwait ( &g_sl );
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/* First time initialization */
if( !g_pagesize )
g_pagesize = getpagesize ( );
if( !g_regionsize )
g_regionsize = getregionsize ( );
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/* Allocate this */
ptr = VirtualAlloc ( ptr, size,
MEM_RESERVE | MEM_COMMIT | MEM_TOP_DOWN,
PAGE_READWRITE );
if( !ptr )
{
ptr = (void *) -1;
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goto mmap_exit;
}
mmap_exit:
/* Release spin lock */
slrelease ( &g_sl );
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return ptr;
}
long
munmap( void *ptr,
long size )
{
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static long g_pagesize;
static long g_regionsize;
int rc = -1;
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/* Wait for spin lock */
slwait ( &g_sl );
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/* First time initialization */
if( !g_pagesize )
g_pagesize = getpagesize ( );
if( !g_regionsize )
g_regionsize = getregionsize ( );
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/* Free this */
if( !VirtualFree ( ptr, 0,
MEM_RELEASE ) )
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goto munmap_exit;
rc = 0;
munmap_exit:
/* Release spin lock */
slrelease ( &g_sl );
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return rc;
}
#endif