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transmission/libtransmission/trevent.c

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/*
* This file Copyright (C) 2007-2009 Charles Kerr <charles@transmissionbt.com>
*
* 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.
*
* $Id$
*/
#include <assert.h>
#include <errno.h>
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include <signal.h>
#include "transmission.h"
#include "session.h"
#ifdef WIN32
#include <WinSock2.h>
static int
pgpipe( int handles[2] )
{
SOCKET s;
struct sockaddr_in serv_addr;
int len = sizeof( serv_addr );
handles[0] = handles[1] = INVALID_SOCKET;
if ( ( s = socket( AF_INET, SOCK_STREAM, 0 ) ) == INVALID_SOCKET )
{
/* ereport(LOG, (errmsg_internal("pgpipe failed to create socket: %ui", WSAGetLastError()))); */
return -1;
}
memset( &serv_addr, 0, sizeof( serv_addr ) );
serv_addr.sin_family = AF_INET;
serv_addr.sin_port = htons(0);
serv_addr.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
if (bind(s, (SOCKADDR *) & serv_addr, len) == SOCKET_ERROR)
{
/* ereport(LOG, (errmsg_internal("pgpipe failed to bind: %ui", WSAGetLastError()))); */
closesocket(s);
return -1;
}
if (listen(s, 1) == SOCKET_ERROR)
{
/* ereport(LOG, (errmsg_internal("pgpipe failed to listen: %ui", WSAGetLastError()))); */
closesocket(s);
return -1;
}
if (getsockname(s, (SOCKADDR *) & serv_addr, &len) == SOCKET_ERROR)
{
/* ereport(LOG, (errmsg_internal("pgpipe failed to getsockname: %ui", WSAGetLastError()))); */
closesocket(s);
return -1;
}
if ((handles[1] = socket(PF_INET, SOCK_STREAM, 0)) == INVALID_SOCKET)
{
/* ereport(LOG, (errmsg_internal("pgpipe failed to create socket 2: %ui", WSAGetLastError()))); */
closesocket(s);
return -1;
}
if (connect(handles[1], (SOCKADDR *) & serv_addr, len) == SOCKET_ERROR)
{
/* ereport(LOG, (errmsg_internal("pgpipe failed to connect socket: %ui", WSAGetLastError()))); */
closesocket(s);
return -1;
}
if ((handles[0] = accept(s, (SOCKADDR *) & serv_addr, &len)) == INVALID_SOCKET)
{
/* ereport(LOG, (errmsg_internal("pgpipe failed to accept socket: %ui", WSAGetLastError()))); */
closesocket(handles[1]);
handles[1] = INVALID_SOCKET;
closesocket(s);
return -1;
}
closesocket(s);
return 0;
}
static int
piperead( int s, char *buf, int len )
{
int ret = recv(s, buf, len, 0);
if (ret < 0 && WSAGetLastError() == WSAECONNRESET)
/* EOF on the pipe! (win32 socket based implementation) */
ret = 0;
return ret;
}
#define pipe(a) pgpipe(a)
#define pipewrite(a,b,c) send(a,(char*)b,c,0)
#else
#define piperead(a,b,c) read(a,b,c)
#define pipewrite(a,b,c) write(a,b,c)
#endif
#include <unistd.h>
#include <event.h>
#include "transmission.h"
#include "platform.h"
#include "trevent.h"
#include "utils.h"
/***
****
***/
typedef struct tr_event_handle
{
uint8_t die;
int fds[2];
tr_lock * lock;
tr_session * session;
tr_thread * thread;
struct event_base * base;
struct event pipeEvent;
}
tr_event_handle;
typedef int timer_func ( void* );
struct tr_timer
{
tr_bool inCallback;
timer_func * func;
void * user_data;
struct tr_event_handle * eh;
struct timeval tv;
struct event event;
};
struct tr_run_data
{
void ( *func )( void * );
void * user_data;
};
#define dbgmsg( ... ) \
do { \
if( tr_deepLoggingIsActive( ) ) \
tr_deepLog( __FILE__, __LINE__, "event", __VA_ARGS__ ); \
} while( 0 )
static void
readFromPipe( int fd,
short eventType,
void * veh )
{
char ch;
int ret;
tr_event_handle * eh = veh;
dbgmsg( "readFromPipe: eventType is %hd", eventType );
/* read the command type */
ch = '\0';
do
{
ret = piperead( fd, &ch, 1 );
}
while( !eh->die && ret < 0 && errno == EAGAIN );
dbgmsg( "command is [%c], ret is %d, errno is %d", ch, ret, (int)errno );
switch( ch )
{
case 'r': /* run in libevent thread */
{
struct tr_run_data data;
const size_t nwant = sizeof( data );
const ssize_t ngot = piperead( fd, &data, nwant );
if( !eh->die && ( ngot == (ssize_t)nwant ) )
{
dbgmsg( "invoking function in libevent thread" );
( data.func )( data.user_data );
}
break;
}
case '\0': /* eof */
{
dbgmsg( "pipe eof reached... removing event listener" );
event_del( &eh->pipeEvent );
break;
}
default:
{
assert( 0 && "unhandled command type!" );
break;
}
}
}
static void
logFunc( int severity, const char * message )
{
if( severity >= _EVENT_LOG_ERR )
tr_err( "%s", message );
else
tr_dbg( "%s", message );
}
static void
libeventThreadFunc( void * veh )
{
tr_event_handle * eh = veh;
tr_dbg( "Starting libevent thread" );
#ifndef WIN32
/* Don't exit when writing on a broken socket */
signal( SIGPIPE, SIG_IGN );
#endif
eh->base = event_init( );
eh->session->events = eh;
/* listen to the pipe's read fd */
event_set( &eh->pipeEvent, eh->fds[0], EV_READ | EV_PERSIST, readFromPipe, veh );
event_add( &eh->pipeEvent, NULL );
event_set_log_callback( logFunc );
/* loop until all the events are done */
event_dispatch( );
/* shut down the thread */
tr_lockFree( eh->lock );
event_base_free( eh->base );
eh->session->events = NULL;
tr_free( eh );
tr_dbg( "Closing libevent thread" );
}
void
tr_eventInit( tr_session * session )
{
tr_event_handle * eh;
session->events = NULL;
eh = tr_new0( tr_event_handle, 1 );
eh->lock = tr_lockNew( );
pipe( eh->fds );
eh->session = session;
eh->thread = tr_threadNew( libeventThreadFunc, eh );
/* wait until the libevent thread is running */
while( session->events == NULL )
tr_wait( 100 );
}
void
tr_eventClose( tr_session * session )
{
assert( tr_isSession( session ) );
session->events->die = TRUE;
tr_deepLog( __FILE__, __LINE__, NULL, "closing trevent pipe" );
EVUTIL_CLOSESOCKET( session->events->fds[1] );
}
/**
***
**/
tr_bool
tr_amInEventThread( tr_session * session )
{
assert( tr_isSession( session ) );
assert( session->events != NULL );
return tr_amInThread( session->events->thread );
}
/**
***
**/
static void
timerCallback( int fd UNUSED,
short event UNUSED,
void * vtimer )
{
int more;
struct tr_timer * timer = vtimer;
timer->inCallback = 1;
more = ( *timer->func )( timer->user_data );
timer->inCallback = 0;
if( more )
evtimer_add( &timer->event, &timer->tv );
else
tr_timerFree( &timer );
}
void
tr_timerFree( tr_timer ** ptimer )
{
tr_timer * timer;
/* zero out the argument passed in */
assert( ptimer );
timer = *ptimer;
*ptimer = NULL;
/* destroy the timer directly or via the command queue */
if( timer && !timer->inCallback )
{
assert( tr_amInEventThread( timer->eh->session ) );
event_del( &timer->event );
tr_free( timer );
}
}
tr_timer*
tr_timerNew( tr_session * session,
timer_func func,
void * user_data,
uint64_t interval_milliseconds )
{
tr_timer * timer;
assert( tr_amInEventThread( session ) );
timer = tr_new0( tr_timer, 1 );
timer->func = func;
timer->user_data = user_data;
timer->eh = session->events;
tr_timevalMsec( interval_milliseconds, &timer->tv );
evtimer_set( &timer->event, timerCallback, timer );
evtimer_add( &timer->event, &timer->tv );
return timer;
}
void
tr_runInEventThread( tr_session * session,
void func( void* ), void * user_data )
{
assert( tr_isSession( session ) );
assert( session->events != NULL );
if( tr_amInThread( session->events->thread ) )
{
(func)( user_data );
}
else
{
const char ch = 'r';
int fd = session->events->fds[1];
tr_lock * lock = session->events->lock;
struct tr_run_data data;
tr_lockLock( lock );
pipewrite( fd, &ch, 1 );
data.func = func;
data.user_data = user_data;
pipewrite( fd, &data, sizeof( data ) );
tr_lockUnlock( lock );
}
}
struct event_base *
tr_eventGetBase( tr_session * session )
{
assert( tr_isSession( session ) );
return session->events->base;
}
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