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yap-6.3/packages/clib/nonblockio.c
Vítor Santos Costa 40febfdf9b clib package
2010-06-17 00:40:25 +01:00

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/* $Id$
Part of SWI-Prolog
Author: Jan Wielemaker
E-mail: wielemak@science.uva.nl
WWW: http://www.swi-prolog.org
Copyright (C): 1985-2007, University of Amsterdam
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#define O_DEBUG 1
/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
This module is extracted from socket.c to provide a common ground for
accessing sockets and possibly other devices in non-blocking mode,
allowing for GUI (XPCE) event dispatching, timeout handling and
multi-threaded signal and timeout handling.
Besides dealing with nonblocking aspects, an important facet of this
library is to hide OS differences.
API
---
The API is completely the same as for blocking IO. It is however built
on top of sockets used in non-blocking mode which enables the layer to
listen to Prolog events such as timeouts, GUI processing and thread
interaction. The functions are modelled after the POSIX socket API,
prefixed with nbio_*:
nbio_socket()
nbio_connect()
nbio_bind()
nbio_listen()
nbio_accept()
nbio_closesocket()
and IO is realised using
nbio_read() See also below
nbio_write()
Overall control of the library:
nbio_init()
nbio_cleanup()
nbio_debug()
Error handling
nbio_error() Raises a Prolog exception
Settings
nbio_setopt()
nbio_get_flags()
Address Converstion
nbio_get_sockaddr()
nbio_get_ip4()
Waiting
nbio_select()
Alternative to nbio_read() and nbio_write(), the application program may
call the low-level I/O routines in non-blocking mode and call
nbio_wait(int socket, nbio_request request). This function returns 0 if
it thinks the call might now succeed and -1 if an error occurred,
leaving the exception context in Prolog. On receiving -1, the user must
return an I/O error as soon as possible.
Windows issues
--------------
Winsock is hard to handle in blocking mode without blocking the whole
lot, notably (timeout) signals. We therefore have a seperate thread
dealing with I/O and operating the sockets through WSAAsyncSelect()
generated events. Requests are registered with the plsocket structure,
handled and handled in the socket thread. Upon completion, a message is
sent back to the waiting thread.
Unix issues
-----------
In the Unix version we simply call PL_dispatch() before doing recv() and
leave the details to this function.
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#ifdef __CYGWIN__
#undef HAVE_H_ERRNO
#endif
#include "nonblockio.h"
#include <SWI-Stream.h>
#include "clib.h"
#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <sys/types.h>
#include <assert.h>
#include <string.h>
#ifdef __WINDOWS__
#include <malloc.h>
#endif
#ifndef __WINDOWS__
#define closesocket(n) close((n)) /* same on Unix */
#endif
#ifndef SD_SEND
#define SD_RECEIVE 0 /* shutdown() parameters */
#define SD_SEND 1
#define SD_BOTH 2
#endif
#ifndef SOCKET_ERROR
#define SOCKET_ERROR (-1)
#endif
#ifdef _REENTRANT
#if __WINDOWS__
static CRITICAL_SECTION mutex;
static CRITICAL_SECTION mutex_free;
#define LOCK() EnterCriticalSection(&mutex)
#define UNLOCK() LeaveCriticalSection(&mutex)
#define LOCK_FREE() EnterCriticalSection(&mutex_free)
#define UNLOCK_FREE() LeaveCriticalSection(&mutex_free)
#define INITLOCK() (InitializeCriticalSection(&mutex), \
InitializeCriticalSection(&mutex_free))
#else
#include <pthread.h>
static pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER;
#define LOCK() pthread_mutex_lock(&mutex)
#define UNLOCK() pthread_mutex_unlock(&mutex)
#define LOCK_FREE()
#define UNLOCK_FREE()
#define INITLOCK()
#endif
#else
#define LOCK()
#define UNLOCK()
#define LOCK_FREE()
#define UNLOCK_FREE()
#define INITLOCK()
#endif
#define set(s, f) ((s)->flags |= (f))
#define clear(s, f) ((s)->flags &= ~(f))
#define true(s, f) ((s)->flags & (f))
#define false(s, f) (!true(s, f))
#define PLSOCK_MAGIC 0x38da3f2c
/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
NOTE: We must lock the structure to avoid freeSocket() called from
Prolog deleting the socket while there are still pending events on it
that are concurrently executed in the socket thread.
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
typedef struct _plsocket
{ int magic; /* PLSOCK_MAGIC */
nbio_sock_t id; /* Integer id */
SOCKET socket; /* The OS socket */
int flags; /* Misc flags */
IOSTREAM * input; /* input stream */
IOSTREAM * output; /* output stream */
#ifdef __WINDOWS__
nbio_request request; /* our request */
DWORD thread; /* waiting thread */
DWORD error; /* error while executing request */
int done; /* request completed */
int w32_flags; /* or of received FD_* */
union
{ struct
{ struct sockaddr_in addr; /* accepted address */
int addrlen; /* address length */
nbio_sock_t slave; /* descriptor of slave */
} accept;
struct
{ struct sockaddr_in addr; /* accepted address */
size_t addrlen; /* address length */
} connect;
struct
{ int bytes; /* byte count */
char *buffer; /* the buffer */
size_t size; /* buffer size */
} read;
struct
{ int bytes; /* byte count */
char *buffer; /* the buffer */
size_t written;
size_t size; /* buffer size */
} write;
struct
{ int bytes; /* byte count */
void *buffer; /* the buffer */
size_t size; /* buffer size */
int flags;
struct sockaddr *from;
socklen_t *fromlen;
} recvfrom;
struct
{ int bytes; /* byte count */
void *buffer; /* the buffer */
int size; /* buffer size */
int flags;
const struct sockaddr *to;
int tolen;
} sendto;
} rdata;
#endif
} plsocket;
static plsocket *allocSocket(SOCKET socket);
#ifdef __WINDOWS__
static plsocket *lookupOSSocket(SOCKET socket);
static const char *WinSockError(unsigned long eno);
#endif
static int
need_retry(int error)
{ if ( error == EINTR || error == EAGAIN || error == EWOULDBLOCK )
return TRUE;
return FALSE;
}
#ifdef O_DEBUG
static int debugging;
NBIO_EXPORT(int)
nbio_debug(int level)
{ int old = debugging;
if ( level >= 0 ) /* -1 --> return current setting */
debugging = level;
return old;
}
#define DEBUG(l, g) if ( debugging >= l ) g
#else
#define DEBUG(l, g) (void)0
int
nbio_debug(int level)
{ return 0;
}
#endif
void /* allow debugger breakpoint */
tcp_debug()
{ Sdprintf("Trapping debugger\n");
}
/*******************************
* COMPATIBILITY *
*******************************/
#ifdef __WINDOWS__
static UINT WM_SOCKET = WM_APP+20;
static UINT WM_REQUEST = WM_APP+21;
static UINT WM_READY = WM_APP+22;
static UINT WM_DONE = WM_APP+23;
#if O_DEBUG
static char *
request_name(nbio_request request)
{ switch(request)
{ case REQ_NONE: return "req_none";
case REQ_ACCEPT: return "req_accept";
case REQ_CONNECT: return "req_connect";
case REQ_READ: return "req_read";
case REQ_WRITE: return "req_write";
case REQ_RECVFROM:return "req_recvfrom";
case REQ_SENDTO: return "req_sendto";
default: return "req_???";
}
}
static char *
event_name(int ev)
{ char buf[256];
char *o = buf;
o[0] = '\0';
if ( (ev & FD_READ) ) strcat(o, "|FD_READ");
if ( (ev & FD_WRITE) ) strcat(o, "|FD_WRITE");
if ( (ev & FD_ACCEPT) ) strcat(o, "|FD_ACCEPT");
if ( (ev & FD_CONNECT) ) strcat(o, "|FD_CONNECT");
if ( (ev & FD_CLOSE) ) strcat(o, "|FD_CLOSE");
if ( (ev & FD_OOB) ) strcat(o, "|FD_OOB");
if ( (ev & ~(FD_READ|FD_WRITE|FD_ACCEPT|FD_CONNECT|FD_CLOSE)) )
strcat(o, "|FD_???");
return strdup(buf);
}
#endif
#define F_SETFL 0
#define O_NONBLOCK 0
static int
nbio_fcntl(nbio_sock_t socket, int op, int arg)
{ plsocket *s;
if ( !(s=nbio_to_plsocket(socket)) )
return -1;
switch(op)
{ case F_SETFL:
switch(arg)
{ case O_NONBLOCK:
{ int rval;
int non_block;
non_block = 1;
rval = ioctlsocket(s->socket, FIONBIO, &non_block);
if ( rval )
{ s->flags |= PLSOCK_NONBLOCK;
return 0;
}
return -1;
}
default:
return -1;
}
break;
default:
return -1;
}
}
static HINSTANCE hinstance; /* hinstance */
typedef struct
{ HWND hwnd; /* our window */
DWORD tid; /* thread id */
} local_state;
static local_state nbio_state;
#define State() (&nbio_state)
static int
doneRequest(plsocket *s)
{ SOCKET sock;
s->done = TRUE;
s->request = REQ_NONE;
if ( (s->w32_flags & FD_CLOSE) && (sock=s->socket) >= 0 )
{ s->socket = -1;
closesocket(sock);
}
if ( s->thread )
{ DEBUG(2, Sdprintf("doneRequest(): posting %d\n", s->thread));
PostThreadMessage(s->thread, WM_DONE, 0, (WPARAM)s);
}
return TRUE;
}
static int
waitRequest(plsocket *s)
{ assert(s->magic == PLSOCK_MAGIC);
DEBUG(2, Sdprintf("[%d] (%ld): Waiting for %s on %d ...",
PL_thread_self(), s->thread,
request_name(s->request), (int)s->socket));
for(;;)
{ MSG msg;
if ( PL_handle_signals() < 0 )
{ DEBUG(1, Sdprintf("[%d]: Exception\n", PL_thread_self()));
return FALSE;
}
if ( s->done )
{ DEBUG(2, Sdprintf("[%d]: Done\n", PL_thread_self()));
return TRUE;
}
if ( false(s, PLSOCK_DISPATCH) )
{ if ( !GetMessage(&msg, NULL, WM_DONE, WM_DONE) )
return FALSE;
} else if ( GetMessage(&msg, NULL, 0, 0) )
{ TranslateMessage(&msg);
DispatchMessage(&msg);
} else
{ ExitThread(0); /* WM_QUIT received */
return FALSE; /* NOTREACHED */
}
}
}
int
nbio_wait(nbio_sock_t socket, nbio_request request)
{ plsocket *s;
if ( !(s=nbio_to_plsocket(socket)) )
return -1;
s->flags |= PLSOCK_WAITING;
s->done = FALSE;
s->error = 0;
s->thread = GetCurrentThreadId();
s->request = request;
SendMessage(State()->hwnd, WM_REQUEST, 1, (LPARAM)&s);
DEBUG(2, Sdprintf("[%d] (%ld): Waiting ...",
PL_thread_self(), s->thread));
for(;;)
{ MSG msg;
if ( PL_handle_signals() < 0 )
{ DEBUG(1, Sdprintf("[%d]: Exception\n", PL_thread_self()));
return -1;
}
if ( s->done )
{ DEBUG(2, Sdprintf("[%d]: Done\n", PL_thread_self()));
return 0;
}
if ( false(s, PLSOCK_DISPATCH) )
{ if ( !GetMessage(&msg, NULL, WM_DONE, WM_DONE) )
return FALSE;
} else if ( GetMessage(&msg, NULL, 0, 0) )
{ TranslateMessage(&msg);
DispatchMessage(&msg);
} else
{ ExitThread(0); /* WM_QUIT received */
return -1; /* NOTREACHED */
}
}
}
/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
nbio_select() selects using a set of socket streams.
NOTE: The Windows versions uses our nbio_sock_t abstraction, while the
other version uses the raw Unix file descriptors referencing the
underlying socket.
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
int
nbio_select(int n,
fd_set *readfds, fd_set *writefds, fd_set *exceptfds,
struct timeval *timeout)
{ plsocket **sockets = alloca(n * sizeof(plsocket*));
int i;
DWORD t_end;
if ( !sockets )
{ errno = ENOMEM;
return -1;
}
for(i=0; i<n; i++)
sockets[i] = NULL;
if ( readfds )
{ for(i=0; i<n; i++)
{ if ( FD_ISSET(i, readfds) )
{ plsocket *s = nbio_to_plsocket(i);
if ( s )
{ s->flags |= PLSOCK_WAITING;
s->done = FALSE;
s->error = 0;
s->thread = GetCurrentThreadId();
s->request = (s->flags & PLSOCK_LISTEN) ? REQ_ACCEPT : REQ_READ;
sockets[i] = s;
} else
{ DEBUG(2, Sdprintf("nbio_select(): no socket for %d\n", i));
}
}
}
}
if ( writefds )
return -1; /* not yet implemented */
if ( exceptfds )
return -1; /* idem (might never be) */
if ( timeout )
{ t_end = GetTickCount();
t_end += timeout->tv_sec*1000;
t_end += timeout->tv_usec/1000;
}
FD_ZERO(readfds);
SendMessage(State()->hwnd, WM_REQUEST, n, (LPARAM)sockets);
for(;;)
{ MSG msg;
plsocket **s;
int ready;
if ( PL_handle_signals() < 0 )
{ DEBUG(1, Sdprintf("[%d]: Exception\n", PL_thread_self()));
return -1;
}
for(ready=0, i=0, s=sockets; i<n; i++, s++)
{ if ( *s && (*s)->done )
{ ready++;
FD_SET((unsigned)i, readfds);
}
}
if ( ready > 0 )
return ready;
if ( timeout )
{ DWORD rc;
DWORD t = GetTickCount();
long msec = t_end - t;
if ( msec < 0 )
msec = -msec; /* wrapped around */
rc = MsgWaitForMultipleObjects(0, NULL, FALSE, msec, QS_ALLINPUT);
if ( rc == WAIT_OBJECT_0 )
{ if ( GetMessage(&msg, NULL, 0, 0) )
{ TranslateMessage(&msg);
DispatchMessage(&msg);
} else
{ ExitThread(0); /* WM_QUIT received */
return -1; /* NOTREACHED */
}
} else if ( rc == WAIT_TIMEOUT )
{ return 0;
} else
{ assert(0);
}
} else
{ if ( GetMessage(&msg, NULL, 0, 0) )
{ TranslateMessage(&msg);
DispatchMessage(&msg);
} else
{ ExitThread(0); /* WM_QUIT received */
return -1; /* NOTREACHED */
}
}
}
}
static int
placeRequest(plsocket *s, nbio_request request)
{ if ( s->magic != PLSOCK_MAGIC )
Sdprintf("placeRequest: %p has bad magic\n", s);
s->error = 0;
s->done = FALSE;
s->thread = GetCurrentThreadId();
s->request = request;
clear(s, PLSOCK_WAITING);
SendMessage(State()->hwnd, WM_REQUEST, 1, (LPARAM)&s);
DEBUG(2, Sdprintf("%d (%ld): Placed %s request for %d\n",
PL_thread_self(), s->thread,
request_name(request), (int)s->socket));
return TRUE;
}
static int
doRequest(plsocket *s)
{ if ( s->magic != PLSOCK_MAGIC )
Sdprintf("doRequest: %p has bad magic\n", s);
switch(s->request)
{ case REQ_NONE:
break;
case REQ_CONNECT:
if ( s->w32_flags & FD_CONNECT )
{ s->w32_flags &= ~FD_CONNECT;
if ( true(s, PLSOCK_WAITING) )
{ doneRequest(s);
break;
}
if ( connect(s->socket,
(struct sockaddr*)&s->rdata.connect.addr,
(int)s->rdata.connect.addrlen) )
{ s->error = WSAGetLastError();
switch(s->error)
{ case WSAEWOULDBLOCK:
case WSAEINVAL:
case WSAEALREADY:
break;
case WSAEISCONN:
s->error = 0;
doneRequest(s);
break;
default:
doneRequest(s);
}
} else
{ s->error = 0;
doneRequest(s);
}
}
break;
case REQ_ACCEPT:
if ( s->w32_flags & FD_ACCEPT )
{ SOCKET slave;
s->w32_flags &= ~FD_ACCEPT;
if ( true(s, PLSOCK_WAITING) )
{ doneRequest(s);
break;
}
slave = accept(s->socket,
(struct sockaddr*)&s->rdata.accept.addr,
&s->rdata.accept.addrlen);
if ( slave == SOCKET_ERROR )
{ s->error = WSAGetLastError();
DEBUG(2, Sdprintf("Accept(%d): %s\n",
(int)s->socket, WinSockError(s->error)));
if ( s->error != WSAEWOULDBLOCK )
{ s->rdata.accept.slave = (SOCKET)-1;
doneRequest(s);
}
} else
{ plsocket *pls;
DEBUG(2, Sdprintf("Accept(%d) --> %d\n",
(int)s->socket, (int)slave));
if ( (pls = allocSocket(slave)) )
{ pls->flags |= PLSOCK_ACCEPT; /* requests */
s->rdata.accept.slave = pls->id;
s->error = 0;
doneRequest(s);
} else
{ DEBUG(1, Sdprintf("Socket %d already registered; "
"considering bogus\n", (int)slave));
}
}
}
break;
case REQ_READ:
if ( s->w32_flags & (FD_READ|FD_CLOSE) )
{ s->w32_flags &= ~FD_READ;
if ( true(s, PLSOCK_WAITING) )
{ doneRequest(s);
break;
}
s->rdata.read.bytes = recv(s->socket,
s->rdata.read.buffer,
(int)s->rdata.read.size,
0);
if ( s->rdata.read.bytes < 0 )
{ s->error = WSAGetLastError();
if ( s->error != WSAEWOULDBLOCK )
{ DEBUG(1, Sdprintf("Error reading from %d: %s\n",
s->socket, WinSockError(s->error)));
doneRequest(s);
}
} else
{ doneRequest(s);
}
}
break;
case REQ_RECVFROM:
if ( s->w32_flags & (FD_READ|FD_CLOSE) )
{ int iflen = (int)*s->rdata.recvfrom.fromlen;
s->w32_flags &= ~FD_READ;
if ( true(s, PLSOCK_WAITING) )
{ doneRequest(s);
break;
}
s->rdata.recvfrom.bytes =
recvfrom(s->socket,
s->rdata.recvfrom.buffer,
(int)s->rdata.recvfrom.size,
s->rdata.recvfrom.flags,
s->rdata.recvfrom.from,
&iflen);
if ( s->rdata.recvfrom.bytes < 0 )
{ s->error = WSAGetLastError();
if ( s->error != WSAEWOULDBLOCK )
{ DEBUG(1, Sdprintf("Error recvfrom from %d: %s\n",
s->socket, WinSockError(s->error)));
doneRequest(s);
}
} else
{ *s->rdata.recvfrom.fromlen = iflen;
doneRequest(s);
}
}
break;
case REQ_WRITE:
if ( s->w32_flags & FD_WRITE )
{ int n;
int len = (int)(s->rdata.write.size - s->rdata.write.written);
s->w32_flags &= ~FD_WRITE;
if ( true(s, PLSOCK_WAITING) )
{ doneRequest(s);
break;
}
DEBUG(2, Sdprintf("send() %d bytes\n", s->rdata.write.size));
n = send(s->socket,
s->rdata.write.buffer + s->rdata.write.written,
len, 0);
DEBUG(2, Sdprintf("Wrote %d bytes\n", n));
if ( n < 0 )
{ s->error = WSAGetLastError();
if ( s->error == WSAEWOULDBLOCK )
break;
s->rdata.write.bytes = n;
DEBUG(1, Sdprintf("[%d]: send(%d, %d bytes): %s\n",
PL_thread_self(), s->socket, len,
WinSockError(s->error)));
doneRequest(s);
} else
s->error = 0;
s->rdata.write.written += n;
if ( s->rdata.write.written >= s->rdata.write.size )
{ s->rdata.write.bytes = (int)s->rdata.write.written;
doneRequest(s);
}
}
case REQ_SENDTO:
if ( s->w32_flags & FD_WRITE )
{ int n;
s->w32_flags &= ~FD_WRITE;
if ( true(s, PLSOCK_WAITING) )
{ doneRequest(s);
break;
}
DEBUG(2, Sdprintf("sendto() %d bytes\n", s->rdata.write.size));
n = sendto(s->socket,
s->rdata.sendto.buffer,
s->rdata.sendto.size,
s->rdata.sendto.flags,
s->rdata.sendto.to,
s->rdata.sendto.tolen);
DEBUG(2, Sdprintf("Wrote %d bytes\n", n));
if ( n < 0 )
{ s->error = WSAGetLastError();
s->rdata.write.bytes = n;
DEBUG(1, Sdprintf("[%d]: send(%d, %d bytes): %s\n",
PL_thread_self(), s->socket,
s->rdata.sendto.size,
WinSockError(s->error)));
doneRequest(s);
} else
s->error = 0;
s->rdata.sendto.bytes = n;
doneRequest(s);
}
}
return TRUE;
}
static LRESULT WINAPI
socket_wnd_proc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{ if ( message == WM_REQUEST )
{ plsocket **s = (plsocket **)lParam;
int i, n = (int)wParam;
for(i=0; i<n; i++)
{ if ( s[i] )
{ __try
{ if ( s[i]->magic != PLSOCK_MAGIC )
{ goto nosocket;
}
} __except(EXCEPTION_EXECUTE_HANDLER)
{ goto nosocket;
}
doRequest(s[i]);
}
}
return 0;
nosocket:
Sdprintf("%p@%d is not a socket!?\n", s[i], i);
return 0;
} else if ( message == WM_SOCKET )
{ SOCKET sock = (SOCKET) wParam;
int err = WSAGETSELECTERROR(lParam);
int evt = WSAGETSELECTEVENT(lParam);
plsocket *s;
if ( evt&FD_CLOSE )
{ DEBUG(1,
{ char *nm = event_name(evt);
Sdprintf("WM_SOCKET on %d: ev=(%s); err=%s\n",
(int)sock, nm, err ? WinSockError(err) : "none");
free(nm);
});
} else
{ DEBUG(3,
{ char *nm = event_name(evt);
Sdprintf("WM_SOCKET on %d: ev=(%s); err=%s\n",
(int)sock, nm, err ? WinSockError(err) : "none");
free(nm);
});
}
LOCK_FREE();
s = lookupOSSocket(sock);
if ( s )
{ if ( (s->w32_flags & FD_CLOSE) )
{ DEBUG(1,
{ char *nm = event_name(evt);
Sdprintf("Got event %s (err=%s) on closed socket %d=%d\n",
nm, WinSockError(err), s->id, sock);
free(nm);
})
}
s->w32_flags |= evt;
if ( err == WSAECONNABORTED && s->request == REQ_READ )
{ s->rdata.read.bytes = 0;
doneRequest(s);
} else if ( err )
{ SOCKET sock = s->socket;
s->error = err;
if ( sock )
{ s->socket = -1;
closesocket(sock);
}
switch(s->request)
{ case REQ_CONNECT:
break;
case REQ_ACCEPT:
s->rdata.accept.slave = SOCKET_ERROR;
break;
case REQ_READ:
s->rdata.read.bytes = -1;
break;
case REQ_RECVFROM:
s->rdata.recvfrom.bytes = -1;
break;
case REQ_WRITE:
s->rdata.write.bytes = -1;
break;
case REQ_SENDTO:
s->rdata.sendto.bytes = -1;
break;
}
doneRequest(s);
} else if ( s->socket >= 0 )
{ doRequest(s);
} else
{ doneRequest(s);
}
} else
{ DEBUG(1, Sdprintf("Socket %d is gone (error=%s)\n",
sock, WinSockError(err)));
}
UNLOCK_FREE();
}
return DefWindowProc(hwnd, message, wParam, lParam);
}
static char *
HiddenFrameClass()
{ static char *name;
static WNDCLASS wndClass;
if ( !name )
{ char buf[50];
sprintf(buf, "PlSocketWin%d", (int)hinstance);
name = strdup(buf);
wndClass.style = 0;
wndClass.lpfnWndProc = (LPVOID) socket_wnd_proc;
wndClass.cbClsExtra = 0;
wndClass.cbWndExtra = 0;
wndClass.hInstance = hinstance;
wndClass.hIcon = NULL;
wndClass.hCursor = NULL;
wndClass.hbrBackground = GetStockObject(WHITE_BRUSH);
wndClass.lpszMenuName = NULL;
wndClass.lpszClassName = name;
RegisterClass(&wndClass);
}
return name;
}
static void
destroyHiddenWindow(int rval, void *closure)
{ local_state *s = State();
if ( s->hwnd )
{ DestroyWindow(s->hwnd);
s->hwnd = 0;
}
}
static HWND
SocketHiddenWindow()
{ local_state *s = State();
if ( !s->hwnd )
{ s->hwnd = CreateWindow(HiddenFrameClass(),
"SWI-Prolog socket window",
WS_POPUP,
0, 0, 32, 32,
NULL, NULL, hinstance, NULL);
assert(s->hwnd);
DEBUG(1, Sdprintf("%d created hidden window %p\n",
PL_thread_self(), s->hwnd));
}
return s->hwnd;
}
DWORD WINAPI
socket_thread(LPVOID arg)
{ DWORD parent = (DWORD)arg;
SocketHiddenWindow();
PostThreadMessage(parent, WM_READY, (WPARAM)0, (LPARAM)0);
for(;;)
{ MSG msg;
if ( GetMessage(&msg, NULL, 0, 0) )
{ TranslateMessage(&msg);
DispatchMessage(&msg);
}
}
return 0;
}
static int
startSocketThread()
{ DWORD me = GetCurrentThreadId();
MSG msg;
CreateThread(NULL, /* security */
2048, /* stack */
socket_thread, (LPVOID)me, /* proc+arg */
0, /* flags */
&State()->tid);
GetMessage(&msg, NULL, WM_READY, WM_READY);
DEBUG(1, Sdprintf("Socket thread started\n"));
return TRUE;
}
#else /*__WINDOWS__*/
/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
wait_socket() is the Unix way to wait for input on the socket. By
default event-dispatching on behalf of XPCE is performed. If this is not
desired, you can use tcp_setopt(Socket, dispatch(false)), in which case
this call returns immediately, assuming the actual TCP call will block
without dispatching if no input is available.
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
static int
wait_socket(plsocket *s)
{ if ( true(s, PLSOCK_DISPATCH) )
{ int fd = s->socket;
if ( true(s, PLSOCK_NONBLOCK) && !PL_dispatch(fd, PL_DISPATCH_INSTALLED) )
{ fd_set rfds;
struct timeval tv;
FD_ZERO(&rfds);
FD_SET(fd, &rfds);
tv.tv_sec = 0;
tv.tv_usec = 250000;
select(fd+1, &rfds, NULL, NULL, &tv);
return TRUE;
} else
{ return PL_dispatch(fd, PL_DISPATCH_WAIT);
}
}
return TRUE;
}
int
nbio_wait(nbio_sock_t socket, nbio_request request)
{ plsocket *s;
if ( !(s=nbio_to_plsocket(socket)) )
return -1;
return wait_socket(s) ? 0 : -1;
}
static int
nbio_fcntl(nbio_sock_t socket, int op, int arg)
{ plsocket *s;
int rc;
if ( !(s=nbio_to_plsocket(socket)) )
return -1;
rc = fcntl(s->socket, op, arg);
if ( rc == 0 )
{ if ( op == F_SETFL && arg == O_NONBLOCK )
s->flags |= PLSOCK_NONBLOCK;
} else
nbio_error(errno, TCP_ERRNO);
return rc;
}
/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
NOTE: when called througb wait_for_input/3, the descriptors in the sets
are real underlying Unix socket descriptors and *not* the nbio_sock_t
psuedo descriptors.
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
int
nbio_select(int n,
fd_set *readfds, fd_set *writefds, fd_set *exceptfds,
struct timeval *timeout)
{ return select(n, readfds, writefds, exceptfds, timeout);
}
#endif /*__WINDOWS__*/
/*******************************
* ADMINISTRATION *
*******************************/
static functor_t FUNCTOR_module2;
static functor_t FUNCTOR_ip4;
static functor_t FUNCTOR_ip1;
static atom_t ATOM_any;
static atom_t ATOM_broadcast;
static atom_t ATOM_loopback;
static plsocket **sockets = NULL; /* id --> plsocket* */
static size_t socks_count = 0; /* #registered sockets */
static size_t socks_allocated = 0; /* #allocated entries */
static int initialised = FALSE; /* Windows only */
#ifdef __WINDOWS__
static plsocket *
lookupOSSocket(SOCKET socket)
{ plsocket *p;
size_t i;
LOCK();
for(i=0; i<socks_allocated; i++)
{ if ( (p=sockets[i]) && p->socket == socket )
{ UNLOCK();
if ( p->magic != PLSOCK_MAGIC )
{ errno = EINVAL;
DEBUG(1, Sdprintf("Invalid OS socket: %d\n", socket));
return NULL;
}
return p;
}
}
UNLOCK();
return NULL;
}
#endif /*__WINDOWS__*/
static plsocket *
nbio_to_plsocket_nolock(nbio_sock_t socket)
{ plsocket *p;
if ( socket < 0 || (size_t)socket >= socks_allocated )
{ errno = EINVAL;
return NULL;
}
p = sockets[socket];
if ( !p || p->magic != PLSOCK_MAGIC )
{ DEBUG(1, Sdprintf("Invalid NBIO socket: %d\n", socket));
errno = EINVAL;
return NULL;
}
return p;
}
SOCKET
plsocket_handle(plsocket_ptr pls)
{ return pls->socket;
}
static plsocket *
nbio_to_plsocket_raw(nbio_sock_t socket)
{ plsocket *s;
LOCK();
s = nbio_to_plsocket_nolock(socket);
UNLOCK();
return s;
}
plsocket *
nbio_to_plsocket(nbio_sock_t socket)
{ plsocket *p;
if ( !(p=nbio_to_plsocket_raw(socket)) )
return NULL;
#ifdef __WINDOWS__
if ( p->socket < 0 )
{ p->error = WSAECONNRESET;
return NULL;
}
#endif
return p;
}
NBIO_EXPORT(SOCKET)
nbio_fd(nbio_sock_t socket)
{ plsocket *p;
if ( !(p=nbio_to_plsocket_nolock(socket)) )
return -1;
return p->socket;
}
/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Allocate a wrapper for an OS socket. The wrapper is allocated in an
array of pointers, to keep small integer identifiers we can use with
FD_SET, etc. for implementing a compatible nbio_select().
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
static plsocket *
allocSocket(SOCKET socket)
{ plsocket *p = NULL;
size_t i;
#ifdef __WINDOWS__
if ( (p=lookupOSSocket(socket)) )
{ DEBUG(1, Sdprintf("WinSock %d already registered on %d\n",
(int)socket, p->id));
p->socket = (SOCKET)-1;
}
#endif
LOCK();
if ( socks_count+1 > socks_allocated )
{ if ( socks_allocated )
{ size_t newa = socks_allocated*2;
sockets = PL_realloc(sockets, sizeof(plsocket*)*newa);
for(i=socks_allocated; i<newa; i++)
sockets[i] = NULL;
socks_allocated = newa;
} else
{ socks_allocated = 32;
sockets = PL_malloc(sizeof(plsocket*)*socks_allocated);
memset(sockets, 0, sizeof(plsocket*)*socks_allocated);
}
}
for(i=0; i<socks_allocated; i++)
{ if ( sockets[i] == NULL )
{ sockets[i] = p = PL_malloc(sizeof(*p));
socks_count++;
break;
}
}
UNLOCK();
assert(i<socks_allocated);
memset(p, 0, sizeof(*p));
p->id = (int)i; /* place in the array */
p->socket = socket;
p->flags = PLSOCK_DISPATCH; /* by default, dispatch */
p->magic = PLSOCK_MAGIC;
#ifdef __WINDOWS__
p->w32_flags = 0;
p->request = REQ_NONE;
#endif
p->input = p->output = (IOSTREAM*)NULL;
DEBUG(2, Sdprintf("[%d]: allocSocket(%d): bound to %p\n",
PL_thread_self(), socket, p));
return p;
}
static int
freeSocket(plsocket *s)
{ int rval;
nbio_sock_t socket;
SOCKET sock;
DEBUG(2, Sdprintf("Closing %d\n", s->id));
if ( !s || s->magic != PLSOCK_MAGIC )
{ errno = EINVAL;
return -1;
}
LOCK_FREE();
LOCK();
sockets[s->id] = NULL;
socks_count--;
UNLOCK();
sock = s->socket;
socket = s->id;
s->magic = 0;
PL_free(s);
UNLOCK_FREE();
if ( sock >= 0 )
{ again:
if ( (rval=closesocket(sock)) == SOCKET_ERROR )
{ if ( errno == EINTR )
goto again;
}
DEBUG(2, Sdprintf("freeSocket(%d=%d) returned %d\n",
socket, (int)sock, rval));
} else
{ rval = 0; /* already closed. Use s->error? */
}
return rval;
}
/*******************************
* ERRORS *
*******************************/
#ifdef __WINDOWS__
/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
The code in BILLY_GETS_BETTER is, according to various documents the
right code, but it doesn't work, so we do it by hand.
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
#ifdef BILLY_GETS_BETTER
static const char *
WinSockError(unsigned long eno)
{ char buf[1024];
static HMODULE netmsg = 0;
static int netmsg_loaded = FALSE;
unsigned long flags = (FORMAT_MESSAGE_FROM_SYSTEM|
FORMAT_MESSAGE_IGNORE_INSERTS);
if ( !netmsg_loaded )
{ netmsg_loaded = TRUE;
netmsg = LoadLibraryEx("netmsg.dll", 0, LOAD_LIBRARY_AS_DATAFILE);
if ( !netmsg )
Sdprintf("failed to load netmsg.dll\n");
else
Sdprintf("Loaded netmsg.dll as %p\n", netmsg);
}
if ( netmsg )
flags |= FORMAT_MESSAGE_FROM_HMODULE;
if ( !FormatMessage(flags,
netmsg,
eno,
GetUserDefaultLangID(),
/*MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),*/
buf, sizeof(buf),
0))
{ sprintf(buf, "Unknown socket error (%u)", eno);
}
buf[sizeof(buf)-1]='\0';
return strdup(buf);
}
#else /*BILLY_GETS_BETTER*/
static const char *
WinSockError(unsigned long error)
{ struct
{ int index;
const char *string;
} *ep, edefs[] =
{ { WSAEACCES, "Permission denied" },
{ WSAEADDRINUSE, "Address already in use" },
{ WSAEADDRNOTAVAIL, "Cannot assign requested address" },
{ WSAEAFNOSUPPORT, "Address family not supported by protocol family" },
{ WSAEALREADY, "Operation already in progress" },
{ WSAECONNABORTED, "Software caused connection abort" },
{ WSAECONNREFUSED, "Connection refused" },
{ WSAECONNRESET, "Connection reset by peer" },
{ WSAEDESTADDRREQ, "Destination address required" },
{ WSAEFAULT, "Bad address" },
{ WSAEHOSTDOWN, "Host is down" },
{ WSAEHOSTUNREACH, "No route to host" },
{ WSAEINPROGRESS, "Operation now in progress" },
{ WSAEINTR, "Interrupted function call" },
{ WSAEINVAL, "Invalid argument" },
{ WSAEISCONN, "Socket is already connected" },
{ WSAEMFILE, "Too many open files" },
{ WSAEMSGSIZE, "Message too long" },
{ WSAENETDOWN, "Network is down" },
{ WSAENETRESET, "Network dropped connection on reset" },
{ WSAENETUNREACH, "Network is unreachable" },
{ WSAENOBUFS, "No buffer space available" },
{ WSAENOPROTOOPT, "Bad protocol option" },
{ WSAENOTCONN, "Socket is not connected" },
{ WSAENOTSOCK, "Socket operation on non-socket" },
{ WSAEOPNOTSUPP, "Operation not supported" },
{ WSAEPFNOSUPPORT, "Protocol family not supported" },
{ WSAEPROCLIM, "Too many processes" },
{ WSAEPROTONOSUPPORT, "Protocol not supported" },
{ WSAEPROTOTYPE, "Protocol wrong type for socket" },
{ WSAESHUTDOWN, "Cannot send after socket shutdown" },
{ WSAESOCKTNOSUPPORT, "Socket type not supported" },
{ WSAETIMEDOUT, "Connection timed out" },
{ WSAEWOULDBLOCK, "Resource temporarily unavailable" },
{ WSAEDISCON, "Graceful shutdown in progress" },
{ WSANOTINITIALISED, "Socket layer not initialised" },
/* WinSock 2 errors */
{ WSAHOST_NOT_FOUND, "Host not found" },
{ 0, NULL }
};
char tmp[100];
for(ep=edefs; ep->string; ep++)
{ if ( ep->index == (int)error )
return ep->string;
}
sprintf(tmp, "Unknown error %ld", error);
return strdup(tmp); /* leaks memory on unknown errors */
}
#endif /*BILLY_GETS_BETTER*/
#endif /*__WINDOWS__*/
#ifdef HAVE_H_ERRNO
typedef struct
{ int code;
const char *string;
} error_codes;
static error_codes h_errno_codes[] = {
#ifdef HOST_NOT_FOUND
{ HOST_NOT_FOUND, "Host not found" },
#endif
#ifdef TRY_AGAIN
{ TRY_AGAIN, "Try Again" },
#endif
#ifdef NO_RECOVERY
{ NO_RECOVERY, "No Recovery" },
#endif
#ifdef NO_DATA
{ NO_DATA, "No Data" },
#endif
#ifdef NO_ADDRESS
{ NO_ADDRESS, "No Address" },
#endif
{0, NULL}
};
#else /*HAVE_H_ERRNO*/
#define h_errno_codes NULL
typedef void * error_codes;
#endif /*HAVE_H_ERRNO*/
int
nbio_error(int code, nbio_error_map mapid)
{ const char *msg;
term_t except = PL_new_term_ref();
error_codes *map;
if ( code == EPLEXCEPTION )
return FALSE;
switch( mapid )
{ case TCP_HERRNO:
map = h_errno_codes;
break;
default:
map = NULL;
}
{
#ifdef __WINDOWS__
msg = WinSockError(code);
#else
#ifdef HAVE_H_ERRNO
static char msgbuf[100];
if ( map )
{ while( map->code && map->code != code )
map++;
if ( map->code )
msg = map->string;
else
{ sprintf(msgbuf, "Unknown error %d", code);
msg = msgbuf;
}
} else
#endif
msg = strerror(code);
#endif /*__WINDOWS__*/
if ( !PL_unify_term(except,
CompoundArg("error", 2),
CompoundArg("socket_error", 1),
AtomArg(msg),
PL_VARIABLE) )
return FALSE;
}
return PL_raise_exception(except);
}
const char *
nbio_last_error(nbio_sock_t socket)
{
#ifdef __WINDOWS__
plsocket *s;
if ( !(s=nbio_to_plsocket_raw(socket)) )
return NULL;
if ( s->error )
return WinSockError(s->error);
#endif
return NULL;
}
/*******************************
* INITIALISATION *
*******************************/
NBIO_EXPORT(int)
nbio_init(const char *module)
{ INITLOCK(); /* is this ok? */
LOCK();
if ( initialised )
{ UNLOCK();
return TRUE;
}
initialised = TRUE;
FUNCTOR_module2 = PL_new_functor(PL_new_atom(":"), 2);
FUNCTOR_ip4 = PL_new_functor(PL_new_atom("ip"), 4);
FUNCTOR_ip1 = PL_new_functor(PL_new_atom("ip"), 1);
ATOM_any = PL_new_atom("any");
ATOM_broadcast = PL_new_atom("broadcast");
ATOM_loopback = PL_new_atom("loopback");
#ifdef __WINDOWS__
{ WSADATA WSAData;
hinstance = GetModuleHandle(module);
#if 0
WM_SOCKET = RegisterWindowMessage("SWI-Prolog:nonblockio:WM_SOCKET");
WM_REQUEST = RegisterWindowMessage("SWI-Prolog:nonblockio:WM_REQUEST");
WM_READY = RegisterWindowMessage("SWI-Prolog:nonblockio:WM_READY");
WM_DONE = RegisterWindowMessage("SWI-Prolog:nonblockio:WM_DONE");
#endif
if ( WSAStartup(MAKEWORD(2,0), &WSAData) )
{ UNLOCK();
return PL_warning("nbio_init() - WSAStartup failed.");
}
startSocketThread();
}
#endif /*__WINDOWS__*/
UNLOCK();
return TRUE;
}
NBIO_EXPORT(int)
nbio_cleanup(void)
{ if ( initialised )
{
#ifdef __WINDOWS__
WSACleanup();
#endif
}
return 0;
}
/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
socket(-Socket)
Create a stream inet socket. The socket is represented by a term of
the format $socket(Id).
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
NBIO_EXPORT(nbio_sock_t)
nbio_socket(int domain, int type, int protocol)
{ SOCKET sock;
plsocket *s;
assert(initialised);
if ( (sock = socket(domain, type , protocol)) < 0)
{ nbio_error(errno, TCP_ERRNO);
return -1;
}
if ( !(s=allocSocket(sock)) ) /* register it */
{ closesocket(sock);
return -1;
}
#ifdef __WINDOWS__
WSAAsyncSelect(sock, State()->hwnd, WM_SOCKET,
FD_READ|FD_WRITE|FD_ACCEPT|FD_CONNECT|FD_CLOSE);
#endif
return s->id;
}
NBIO_EXPORT(int)
nbio_closesocket(nbio_sock_t socket)
{ plsocket *s;
if ( !(s = nbio_to_plsocket_raw(socket)) )
{ DEBUG(1, Sdprintf("nbio_closesocket(%d): no plsocket\n", socket));
return -1;
}
if ( true(s, PLSOCK_OUTSTREAM|PLSOCK_INSTREAM) )
{ int flags = s->flags; /* may drop out! */
if ( flags & PLSOCK_INSTREAM )
{ assert(s->input);
Sclose(s->input);
}
if ( flags & PLSOCK_OUTSTREAM )
{ assert(s->output);
Sclose(s->output);
}
} else
{
#ifdef __WINDOWS__
if ( true(s, PLSOCK_CONNECT) )
{ if ( s->socket >= 0 )
shutdown(s->socket, SD_SEND);
}
#endif
freeSocket(s);
}
return 0;
}
NBIO_EXPORT(int)
nbio_setopt(nbio_sock_t socket, nbio_option opt, ...)
{ plsocket *s;
va_list args;
int rc;
if ( !(s = nbio_to_plsocket(socket)) )
return -1;
va_start(args, opt);
switch(opt)
{ case TCP_NONBLOCK:
rc = nbio_fcntl(socket, F_SETFL, O_NONBLOCK);
break;
case TCP_REUSEADDR:
{ int val = va_arg(args, int);
if( setsockopt(s->socket, SOL_SOCKET, SO_REUSEADDR,
(const char *)&val, sizeof(val)) == -1 )
{ nbio_error(h_errno, TCP_HERRNO);
rc = -1;
} else
rc = 0;
break;
}
case TCP_NO_DELAY:
#ifdef TCP_NODELAY
{ int val = va_arg(args, int);
#ifndef IPPROTO_TCP /* Is this correct? */
#define IPPROTO_TCP SOL_SOCKET
#endif
if ( setsockopt(s->socket, IPPROTO_TCP, TCP_NODELAY,
(const char *)&val, sizeof(val)) == -1 )
{ nbio_error(h_errno, TCP_HERRNO);
rc = -1;
} else
{ rc = 0;
}
break;
}
#else
rc = -2; /* not implemented */
#endif
case UDP_BROADCAST:
{ int val = va_arg(args, int);
if ( setsockopt(s->socket, SOL_SOCKET, SO_BROADCAST,
(const char *)&val, sizeof(val)) == -1 )
{ nbio_error(h_errno, TCP_HERRNO);
rc = -1;
} else
rc = 0;
break;
}
case TCP_DISPATCH:
{ int val = va_arg(args, int);
if ( val )
set(s, PLSOCK_DISPATCH);
else
clear(s, PLSOCK_DISPATCH);
rc = 0;
break;
}
case TCP_INSTREAM:
{ IOSTREAM *in = va_arg(args, IOSTREAM*);
s->flags |= PLSOCK_INSTREAM;
s->input = in;
rc = 0;
break;
}
case TCP_OUTSTREAM:
{ IOSTREAM *out = va_arg(args, IOSTREAM*);
s->flags |= PLSOCK_OUTSTREAM;
s->output = out;
rc = 0;
break;
}
default:
rc = -1;
assert(0);
}
va_end(args);
return rc;
}
int
nbio_get_flags(nbio_sock_t socket)
{ plsocket *s;
if ( !(s = nbio_to_plsocket(socket)) )
return -1;
return s->flags;
}
/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Translate a host + port-number into a sockaddr structure.
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
static int
nbio_get_port(term_t Port, int *port)
{ char *name;
if ( PL_get_atom_chars(Port, &name) )
{ struct servent *service;
if ( !(service = getservbyname(name, "tcp")) )
return pl_error(NULL, 0, NULL, ERR_EXISTENCE, "service", Port);
*port = ntohs(service->s_port);
DEBUG(1, Sdprintf("Service %s at port %d\n", name, *port));
return TRUE;
}
if ( PL_get_integer(Port, port) )
return TRUE;
return pl_error(NULL, 0, NULL, ERR_ARGTYPE, -1, Port, "port");
}
/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Convert a term Host:Port to a socket address. Port is either an integer
or the name of a registered port (e.g. 'smtp').
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
int
nbio_get_sockaddr(term_t Address, struct sockaddr_in *addr)
{ int port;
addr->sin_family = AF_INET;
addr->sin_addr.s_addr = INADDR_ANY;
if ( PL_is_functor(Address, FUNCTOR_module2) )
{ char *hostName;
term_t arg = PL_new_term_ref();
_PL_get_arg(1, Address, arg);
if ( PL_get_atom_chars(arg, &hostName) )
{ struct hostent *host;
if( !(host = gethostbyname(hostName)) )
return nbio_error(h_errno, TCP_HERRNO);
if ( (int)sizeof(addr->sin_addr) < host->h_length )
return PL_warning("Oops, host address too long!");
memcpy(&addr->sin_addr, host->h_addr, host->h_length);
} else if ( !nbio_get_ip(arg, &addr->sin_addr) )
{ return pl_error(NULL, 0, NULL, ERR_ARGTYPE, 1, arg, "atom|ip/4");
}
_PL_get_arg(2, Address, arg);
if ( !nbio_get_port(arg, &port) )
return FALSE;
} else if ( PL_is_variable(Address) )
{ port = 0;
} else if ( !nbio_get_port(Address, &port) )
return FALSE;
addr->sin_port = htons((short)port);
return TRUE;
}
int
nbio_get_ip(term_t ip4, struct in_addr *ip)
{ unsigned long hip = 0;
if ( PL_is_functor(ip4, FUNCTOR_ip4) )
{ int i, ia;
term_t a = PL_new_term_ref();
for(i=1; i<=4; i++)
{ _PL_get_arg(i, ip4, a);
if ( PL_get_integer(a, &ia) )
hip |= ia << ((4-i)*8);
else
return FALSE;
}
hip = htonl(hip);
memcpy(ip, &hip, sizeof(hip));
return TRUE;
} else if ( PL_is_functor(ip4, FUNCTOR_ip1) )
{ term_t a = PL_new_term_ref();
atom_t id;
_PL_get_arg(1, ip4, a);
if ( PL_get_atom(a, &id) )
{ if ( id == ATOM_any )
ip->s_addr = INADDR_ANY;
else if ( id == ATOM_broadcast )
ip->s_addr = INADDR_BROADCAST;
else if ( id == ATOM_loopback )
ip->s_addr = INADDR_LOOPBACK;
else
return FALSE;
return TRUE;
}
}
return FALSE;
}
int
nbio_unify_ip4(term_t Ip, unsigned long hip)
{ return PL_unify_term(Ip,
PL_FUNCTOR, FUNCTOR_ip4,
IntArg((hip >> 24) & 0xff),
IntArg((hip >> 16) & 0xff),
IntArg((hip >> 8) & 0xff),
IntArg((hip >> 0) & 0xff));
}
int
nbio_bind(nbio_sock_t socket, struct sockaddr *my_addr, size_t addrlen)
{ plsocket *s;
if ( !(s = nbio_to_plsocket(socket)) )
return -1;
#ifdef __WINDOWS__
if ( bind(s->socket, my_addr, (int)addrlen) )
#else
if ( bind(s->socket, my_addr, addrlen) )
#endif
{ nbio_error(errno, TCP_ERRNO);
return -1;
}
s->flags |= PLSOCK_BIND;
return 0;
}
int
nbio_connect(nbio_sock_t socket,
const struct sockaddr *serv_addr,
size_t addrlen)
{ plsocket *s;
if ( !(s = nbio_to_plsocket(socket)) )
return -1;
#ifdef __WINDOWS__
if ( connect(s->socket, serv_addr, (int)addrlen) )
{ s->error = WSAGetLastError();
if ( s->error == WSAEWOULDBLOCK )
{ s->rdata.connect.addrlen = addrlen;
memcpy(&s->rdata.connect.addr, serv_addr, addrlen);
placeRequest(s, REQ_CONNECT);
waitRequest(s);
}
if ( s->error )
{ nbio_error(s->error, TCP_ERRNO);
return -1;
}
}
#else /*!__WINDOWS__*/
for(;;)
{ if ( connect(s->socket, serv_addr, addrlen) )
{ if ( need_retry(errno) )
{ if ( PL_handle_signals() < 0 )
return -1;
continue;
}
nbio_error(errno, TCP_ERRNO);
return -1;
} else
break;
}
#endif
s->flags |= PLSOCK_CONNECT;
return 0;
}
nbio_sock_t
nbio_accept(nbio_sock_t master, struct sockaddr *addr, socklen_t *addrlen)
{ SOCKET slave;
plsocket *m, *s;
if ( !(m = nbio_to_plsocket(master)) )
return -1;
#ifdef __WINDOWS__
{ int alen = (int)*addrlen;
slave = accept(m->socket, addr, &alen);
*addrlen = alen;
}
if ( slave == SOCKET_ERROR )
{ m->error = WSAGetLastError();
if ( m->error == WSAEWOULDBLOCK )
{ m->rdata.accept.addrlen = sizeof(m->rdata.accept.addr);
placeRequest(m, REQ_ACCEPT);
if ( !waitRequest(m) )
return -1;
if ( m->error )
return nbio_error(m->error, TCP_ERRNO);
*addrlen = m->rdata.accept.addrlen;
memcpy(addr, &m->rdata.accept.addr, m->rdata.accept.addrlen);
return m->rdata.accept.slave; /* already registered */
} else
{ nbio_error(m->error, TCP_ERRNO);
return -1;
}
}
#else /*__WINDOWS__*/
for(;;)
{ if ( !wait_socket(m) )
return -1;
slave = accept(m->socket, addr, addrlen);
if ( slave == SOCKET_ERROR )
{ if ( need_retry(errno) )
{ if ( PL_handle_signals() < 0 )
return -1;
continue;
} else
{ nbio_error(errno, TCP_ERRNO);
return -1;
}
} else
break;
}
#endif /*__WINDOWS__*/
s = allocSocket(slave);
s->flags |= PLSOCK_ACCEPT;
#ifndef __WINDOWS__
if ( true(s, PLSOCK_NONBLOCK) )
nbio_setopt(slave, TCP_NONBLOCK);
#endif
return s->id;
}
int
nbio_listen(nbio_sock_t socket, int backlog)
{ plsocket *s;
if ( !(s = nbio_to_plsocket(socket)) )
return -1;
if( listen(s->socket, backlog) == -1 )
{ nbio_error(errno, TCP_ERRNO);
return -1;
}
s->flags |= PLSOCK_LISTEN;
return 0;
}
/*******************************
* IO-STREAM STUFF *
*******************************/
#define fdFromHandle(p) ((int)((intptr_t)(p)))
ssize_t
nbio_read(int socket, char *buf, size_t bufSize)
{ plsocket *s;
int n;
if ( !(s = nbio_to_plsocket(socket)) )
return -1;
#ifdef __WINDOWS__
DEBUG(3, Sdprintf("[%d] reading from socket %d\n",
PL_thread_self(), socket));
n = recv(s->socket, buf, (int)bufSize, 0);
if ( n < 0 )
{ int wsaerrno;
if ( (wsaerrno=WSAGetLastError()) == WSAEWOULDBLOCK )
{ s->rdata.read.buffer = buf;
s->rdata.read.size = bufSize;
placeRequest(s, REQ_READ);
if ( !waitRequest(s) )
{ errno = EPLEXCEPTION;
return -1;
}
n = s->rdata.read.bytes;
}
if ( n < 0 )
{ s->error = wsaerrno;
errno = EIO;
}
} else
{ s->error = 0;
}
#else /*__WINDOWS__*/
for(;;)
{ if ( !wait_socket(s) )
{ errno = EPLEXCEPTION;
return -1;
}
n = recv(s->socket, buf, bufSize, 0);
if ( n == -1 && need_retry(errno) )
{ if ( PL_handle_signals() < 0 )
{ errno = EPLEXCEPTION;
return -1;
}
continue;
}
break;
}
#endif /*__WINDOWS__*/
return n;
}
ssize_t
nbio_write(nbio_sock_t socket, char *buf, size_t bufSize)
{ plsocket *s;
size_t len = bufSize;
char *str = buf;
if ( !(s = nbio_to_plsocket(socket)) )
return -1;
#ifdef __WINDOWS__
while( len != 0 )
{ ssize_t n;
DEBUG(3, Sdprintf("[%d] sending %d bytes using socket %d\n",
PL_thread_self(), (int)len, socket));
n = send(s->socket, str, (int)len, 0);
if ( n < 0 )
{ int error = WSAGetLastError();
if ( error == WSAEWOULDBLOCK )
break;
DEBUG(1, Sdprintf("[%d]: send(%d, %d bytes): %s\n",
PL_thread_self(), s->socket, (int)bufSize,
WinSockError(error)));
s->error = error;
return -1;
}
len -= n;
str += n;
}
if ( len > 0 ) /* operation would block */
{ s->rdata.write.buffer = str;
s->rdata.write.size = len;
s->rdata.write.written = 0;
placeRequest(s, REQ_WRITE);
if ( !waitRequest(s) )
{ errno = EPLEXCEPTION; /* handled Prolog signal */
return -1;
}
if ( s->rdata.write.bytes < 0 )
return -1; /* error in s->error */
}
#else /*__WINDOWS__*/
while( len > 0 )
{ int n;
n = send(s->socket, str, len, 0);
if ( n < 0 )
{ if ( need_retry(errno) )
{ if ( PL_handle_signals() < 0 )
{ errno = EPLEXCEPTION;
return -1;
}
continue;
}
return -1;
}
len -= n;
str += n;
}
#endif /*__WINDOWS__*/
return bufSize;
}
int
nbio_close_input(nbio_sock_t socket)
{ int rc = 0;
plsocket *s;
if ( !(s = nbio_to_plsocket_raw(socket)) )
return -1;
DEBUG(2, Sdprintf("[%d]: nbio_close_input(%d, flags=0x%x)\n",
PL_thread_self(), socket, s->flags));
s->flags &= ~PLSOCK_INSTREAM;
#ifdef __WINDOWS__
if ( false(s, PLSOCK_LISTEN) )
{ SOCKET sock;
if ( (sock=s->socket) < 0 )
{ s->error = WSAECONNRESET;
rc = -1;
} else if ( shutdown(sock, SD_RECEIVE) == SOCKET_ERROR )
{ DEBUG(1, Sdprintf("shutdown(%d=%d, SD_RECEIVE) failed: %s\n",
socket, s->socket,
WinSockError(WSAGetLastError())));
Sseterr(s->input, SIO_FERR, WinSockError(WSAGetLastError()));
rc = -1;
}
}
#endif
s->input = NULL;
if ( !(s->flags & (PLSOCK_INSTREAM|PLSOCK_OUTSTREAM)) )
return freeSocket(s);
return rc;
}
int
nbio_close_output(nbio_sock_t socket)
{ int rc = 0;
plsocket *s;
if ( !(s = nbio_to_plsocket_raw(socket)) )
return -1;
DEBUG(2, Sdprintf("[%d]: nbio_close_output(%d, flags=0x%x)\n",
PL_thread_self(), socket, s->flags));
if ( s->output )
{
#if __WINDOWS__
SOCKET sock;
#endif
s->flags &= ~PLSOCK_OUTSTREAM;
#if __WINDOWS__
if ( (sock=s->socket) < 0 )
{ s->error = WSAECONNRESET;
rc = -1;
} else if ( shutdown(sock, SD_SEND) == SOCKET_ERROR )
{ const char *msg;
msg = WinSockError(WSAGetLastError());
Sseterr(s->output, SIO_FERR, msg);
DEBUG(1, Sdprintf("shutdown(%d=%d, SD_SEND) failed: %s\n",
socket, s->socket, msg));
rc = -1;
}
#endif
}
DEBUG(3, Sdprintf("%d->flags = 0x%x\n", socket, s->flags));
s->output = NULL;
if ( !(s->flags & (PLSOCK_INSTREAM|PLSOCK_OUTSTREAM)) )
return freeSocket(s);
return rc;
}
/*******************************
* UDP SUPPORT *
*******************************/
ssize_t
nbio_recvfrom(int socket, void *buf, size_t bufSize, int flags,
struct sockaddr *from, socklen_t *fromlen)
{ plsocket *s;
int n;
if ( !(s = nbio_to_plsocket(socket)) )
return -1;
#ifdef __WINDOWS__
DEBUG(3, Sdprintf("[%d] recvfrom from socket %d\n",
PL_thread_self(), socket));
{ int iflen = (int)*fromlen; /* Windows recvfrom uses int */
n = recvfrom(s->socket, buf, (int)bufSize, flags, from, &iflen);
if ( n < 0 )
{ int wsaerrno;
if ( (wsaerrno=WSAGetLastError()) == WSAEWOULDBLOCK )
{ s->rdata.recvfrom.buffer = buf;
s->rdata.recvfrom.size = bufSize;
s->rdata.recvfrom.flags = flags;
s->rdata.recvfrom.from = from;
s->rdata.recvfrom.fromlen = fromlen;
placeRequest(s, REQ_RECVFROM);
if ( !waitRequest(s) )
{ errno = EPLEXCEPTION;
return -1;
}
n = s->rdata.recvfrom.bytes;
}
if ( n < 0 )
{ s->error = wsaerrno;
errno = EIO;
}
} else
{ *fromlen = iflen;
s->error = 0;
}
}
#else /*__WINDOWS__*/
for(;;)
{ if ( (flags & MSG_DONTWAIT) == 0 && !wait_socket(s) )
{ errno = EPLEXCEPTION;
return -1;
}
n = recvfrom(s->socket, buf, bufSize, flags, from, fromlen);
if ( n == -1 && need_retry(errno) )
{ if ( PL_handle_signals() < 0 )
{ errno = EPLEXCEPTION;
return -1;
}
if((flags & MSG_DONTWAIT) != 0)
break;
continue;
}
break;
}
#endif /*__WINDOWS__*/
return n;
}
ssize_t
nbio_sendto(nbio_sock_t socket, void *buf, size_t bufSize, int flags,
const struct sockaddr *to, socklen_t tolen)
{ plsocket *s;
#ifdef __WINDOWS__
ssize_t n;
#endif
if ( !(s = nbio_to_plsocket(socket)) )
return -1;
#ifdef __WINDOWS__
DEBUG(3, Sdprintf("[%d] sending %d bytes using socket %d\n",
PL_thread_self(), (int)bufSize, socket));
n = sendto(s->socket, buf, (int)bufSize, flags, to, (int)tolen);
if ( n < 0 )
{ int error = WSAGetLastError();
if ( error == WSAEWOULDBLOCK )
goto wouldblock;
DEBUG(1, Sdprintf("[%d]: sendto(%d, %d bytes): %s\n",
PL_thread_self(), s->socket, (int)bufSize,
WinSockError(error)));
s->error = error;
return -1;
} else
return n;
wouldblock:
s->rdata.sendto.buffer = buf;
s->rdata.sendto.size = (int)bufSize;
s->rdata.sendto.bytes = 0;
s->rdata.sendto.flags = flags;
s->rdata.sendto.to = to;
s->rdata.sendto.tolen = (int)tolen;
placeRequest(s, REQ_SENDTO);
if ( !waitRequest(s) )
{ errno = EPLEXCEPTION; /* handled Prolog signal */
return -1;
}
return s->rdata.sendto.bytes;
#else /*__WINDOWS__*/
return sendto(s->socket, buf, bufSize, flags, to, tolen);
#endif /*__WINDOWS__*/
}
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