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Overview
Comment:Merge fixes for [socket -async] and other improvements to the unix socket code
Downloads: Tarball | ZIP archive | SQL archive
Timelines: family | ancestors | descendants | both | trunk | potential incompatibility
Files: files | file ages | folders
SHA1: 8eefe5a06f210b64a162a8a25ae69d6d72679069
User & Date: max 2011-06-22 14:32:08
References
2011-07-12
16:48 New ticket [3364777fff] segfaulting tests. artifact: 755ceafcd6 user: dgp
Context
2011-06-22
16:40
Merged from core-8-5-branch: Updated to platform 1.0.10. Added handling of the DEB_HOST_MULTIARCH lo... check-in: 3adcfbaba3 user: andreask tags: trunk
14:32
Merge fixes for [socket -async] and other improvements to the unix socket code check-in: 8eefe5a06f user: max tags: trunk, potential incompatibility
14:21
complete a comment in socket.test Closed-Leaf check-in: 8f2747dc54 user: max tags: rmax-ipv6-branch
2011-06-21
16:49
tcltest 2.3.3 fixes: * Use package ifneeded so slave gets exactly same tcltest version as master ... check-in: 5c0438d85a user: dgp tags: trunk
Changes
Hide Diffs Unified Diffs Ignore Whitespace Patch

Changes to ChangeLog.












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2011-06-21  Don Porter  <[email protected]>

	* generic/tclLink.c:	Prevent multiple links to a single Tcl
	variable when calling Tcl_LinkVar(). [Bug 3317466]

2011-06-13  Don Porter  <[email protected]>

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2011-06-22  Reinhard Max  <[email protected]>

	Merge from rmax-ipv6-branch:
	* unix/tclUnixSock.c: Fix [socket -async], so that all addresses
	returned by getaddrinfo() are tried, not just the first one. This
	requires the event loop to be running while the async connection
	is in progress. ***POTENTIAL INCOMPATIBILITY***
	* tests/socket.test: Add a test for the above.
	* doc/socket: Document the fact that -async needs the event loop
	* generic/tclIOSock.c: AI_ADDRCONFIG is broken on HP-UX

2011-06-21  Don Porter  <[email protected]>

	* generic/tclLink.c:	Prevent multiple links to a single Tcl
	variable when calling Tcl_LinkVar(). [Bug 3317466]

2011-06-13  Don Porter  <[email protected]>

Changes to doc/socket.n.

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port number will be chosen at random by the system software.
.TP
\fB\-async\fR
.
This option will cause the client socket to be connected
asynchronously. This means that the socket will be created immediately
but may not yet be connected to the server, when the call to


\fBsocket\fR returns. When a \fBgets\fR or \fBflush\fR is done on the
socket before the connection attempt succeeds or fails, if the socket
is in blocking mode, the operation will wait until the connection is
completed or fails. If the socket is in nonblocking mode and a
\fBgets\fR or \fBflush\fR is done on the socket before the connection
attempt succeeds or fails, the operation returns immediately and
\fBfblocked\fR on the socket returns 1. Synchronous client sockets may
be switched (after they have connected) to operating in asynchronous
mode using:
.RS
.PP
.CS
\fBchan configure \fIchan \fB\-blocking 0\fR
.CE
.PP
See the \fBchan\fR \fBconfigure\fR command for more details.









.RE
.SH "SERVER SOCKETS"
.PP
If the \fB\-server\fR option is specified then the new socket will be
a server that listens on the given \fIport\fR (either an integer or a
service name, where supported and understood by the host operating
system; if \fIport\fR is zero, the operating system will allocate a






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port number will be chosen at random by the system software.
.TP
\fB\-async\fR
.
This option will cause the client socket to be connected
asynchronously. This means that the socket will be created immediately
but may not yet be connected to the server, when the call to
\fBsocket\fR returns.

When a \fBgets\fR or \fBflush\fR is done on the socket before the
connection attempt succeeds or fails, if the socket is in blocking
mode, the operation will wait until the connection is completed or
fails. If the socket is in nonblocking mode and a \fBgets\fR or
\fBflush\fR is done on the socket before the connection attempt
succeeds or fails, the operation returns immediately and
\fBfblocked\fR on the socket returns 1. Synchronous client sockets may
be switched (after they have connected) to operating in asynchronous
mode using:
.RS
.PP
.CS
\fBchan configure \fIchan \fB\-blocking 0\fR
.CE
.PP
See the \fBchan\fR \fBconfigure\fR command for more details.

The Tcl event loop should be running while an asynchronous connection
is in progress, because it may have to do several connection attempts
in the background. Runnig the event loop also allows you to set up a
writable channel event on the socket to get notified when the
asyncronous connection has succeeded or failed. See the \fBvwait\fR
and the \fBchan\fR comands for more details on the event loop and
channel events.

.RE
.SH "SERVER SOCKETS"
.PP
If the \fB\-server\fR option is specified then the new socket will be
a server that listens on the given \fIport\fR (either an integer or a
service name, where supported and understood by the host operating
system; if \fIport\fR is zero, the operating system will allocate a

Changes to generic/tclIOSock.c.

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            } else if (strcmp(family, "inet6") == 0) {
                hints.ai_family = AF_INET6;
            }
        }
    }

    hints.ai_socktype = SOCK_STREAM;
#if defined(AI_ADDRCONFIG) && !defined(_AIX)


    /* Missing on: OpenBSD, NetBSD.  Causes failure when used on AIX 5.1 */

    hints.ai_flags |= AI_ADDRCONFIG;
#endif
    if (willBind) {
	hints.ai_flags |= AI_PASSIVE;
    } 

    result = getaddrinfo(native, portstring, &hints, addrlist);






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            } else if (strcmp(family, "inet6") == 0) {
                hints.ai_family = AF_INET6;
            }
        }
    }

    hints.ai_socktype = SOCK_STREAM;
#if defined(AI_ADDRCONFIG) && !defined(_AIX) && !defined(__hpux)
    /*
     * Missing on: OpenBSD, NetBSD.
     * Causes failure when used on AIX 5.1 and HP-UX
     */
    hints.ai_flags |= AI_ADDRCONFIG;
#endif
    if (willBind) {
	hints.ai_flags |= AI_PASSIVE;
    } 

    result = getaddrinfo(native, portstring, &hints, addrlist);

Changes to tests/socket.test.

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# Some tests require the testthread and exec commands
testConstraint testthread [llength [info commands testthread]]
testConstraint exec [llength [info commands exec]]

# Produce a random port number in the Dynamic/Private range
# from 49152 through 65535.
proc randport {} { expr {int(rand()*16383+49152)} }



















# If remoteServerIP or remoteServerPort are not set, check in the environment
# variables for externally set values.
#

if {![info exists remoteServerIP]} {
    if {[info exists env(remoteServerIP)]} {
................................................................................
    vwait x
    fconfigure $sock -blocking 0
    set result a:[gets $sock]
    lappend result b:[gets $sock]
    fconfigure $sock -blocking 1
    puts $s2 two
    flush $s2
    after idle {set x 1}
    vwait x
    fconfigure $sock -blocking 0
    lappend result c:[gets $sock]
} -cleanup {
    fconfigure $sock -blocking 1
    close $s2
    close $s
................................................................................
# cleanup
if {$remoteProcChan ne ""} {
    catch {sendCommand exit}
}
catch {close $commandSocket}
catch {close $remoteProcChan}
}


































































::tcltest::cleanupTests
flush stdout
return

# Local Variables:
# mode: tcl
# fill-column: 78
# End:






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# Some tests require the testthread and exec commands
testConstraint testthread [llength [info commands testthread]]
testConstraint exec [llength [info commands exec]]

# Produce a random port number in the Dynamic/Private range
# from 49152 through 65535.
proc randport {} { expr {int(rand()*16383+49152)} }

# Test the latency of tcp connections over the loopback interface. Some OSes
# (e.g. NetBSD) seem to use the Nagle algorithm and delayed ACKs, so it takes
# up to 200ms for a packet sent to localhost to arrive. We're measuring this
# here, so that OSes that don't have this problem can run the tests at full
# speed.
set server [socket -server {apply {{s a p} {set ::s1 $s}}} 0]
set s2 [socket localhost [lindex [fconfigure $server -sockname] 2]]
vwait s1; close $server
fconfigure $s1 -buffering line
fconfigure $s2 -buffering line
set t1 [clock milliseconds]
puts $s2 test1; gets $s1
puts $s2 test2; gets $s1
close $s1; close $s2
set t2 [clock milliseconds]
set latency [expr {($t2-$t1)*2}]; # doubled as a safety margin
unset t1 t2 s1 s2 server

# If remoteServerIP or remoteServerPort are not set, check in the environment
# variables for externally set values.
#

if {![info exists remoteServerIP]} {
    if {[info exists env(remoteServerIP)]} {
................................................................................
    vwait x
    fconfigure $sock -blocking 0
    set result a:[gets $sock]
    lappend result b:[gets $sock]
    fconfigure $sock -blocking 1
    puts $s2 two
    flush $s2
    after $latency {set x 1}; # NetBSD fails here if we do [after idle]
    vwait x
    fconfigure $sock -blocking 0
    lappend result c:[gets $sock]
} -cleanup {
    fconfigure $sock -blocking 1
    close $s2
    close $s
................................................................................
# cleanup
if {$remoteProcChan ne ""} {
    catch {sendCommand exit}
}
catch {close $commandSocket}
catch {close $remoteProcChan}
}
unset ::tcl::unsupported::socketAF
test socket-14.0 {[socket -async] when server only listens on one address family} \
    -constraints [list socket supported_any] \
    -setup {
        proc accept {s a p} {
            global x
            puts $s bye
            close $s
            set x ok
        }
        set server [socket -server accept -myaddr 127.0.0.1 0]
        set port [lindex [fconfigure $server -sockname] 2]
    } -body {
        set client [socket -async localhost $port]
        set after [after 1000 {set x [fconfigure $client -error]}]
        vwait x
        set x
    } -cleanup {
        after cancel $after
        close $server
        close $client
        unset x
    } -result ok
test socket-14.1 {[socket -async] fileevent while still connecting} \
    -constraints [list socket supported_any] \
    -setup {
        proc accept {s a p} {
            global x
            puts $s bye
            close $s
	    lappend x ok
        }
        set server [socket -server accept -myaddr 127.0.0.1 0]
        set port [lindex [fconfigure $server -sockname] 2]
    } -body {
        set client [socket -async localhost $port]
        fileevent $client writable {
            lappend x [expr {[fconfigure $client -error] eq ""}]
        }
        set after [after 1000 {set x timeout}]
        vwait x
        vwait x
        set x
    } -cleanup {
        after cancel $after
        close $server
        close $client
        unset x
    } -result {ok 1}
test socket-14.2 {[socket -async] fileevent connection refused} \
    -constraints [list socket supported_any] \
    -body {
        set client [socket -async localhost [randport]]
        fileevent $client writable {set x [fconfigure $client -error]}
        set after [after 1000 {set x timeout}]
        vwait x
        if {$x eq "timeout"} {
            append x ": [fconfigure $client -error]"
        }
        set x
    } -cleanup {
        after cancel $after
        close $client
        unset x
    } -result "connection refused"

::tcltest::cleanupTests
flush stdout
return

# Local Variables:
# mode: tcl
# fill-column: 78
# End:

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 * what they say on the tin. :-) They also only ever refer to their arguments
 * once, and so can be used without regard to side effects.
 */

#define SET_BITS(var, bits)	((var) |= (bits))
#define CLEAR_BITS(var, bits)	((var) &= ~(bits))





/*
 * This is needed to comply with the strict aliasing rules of GCC, but it also
 * simplifies casting between the different sockaddr types.
 */

typedef union {
    struct sockaddr sa;
................................................................................
    TcpState *statePtr;
    int fd;
    struct TcpFdList *next;
} TcpFdList;

struct TcpState {
    Tcl_Channel channel;	/* Channel associated with this file. */
    TcpFdList *fds;		/* The file descriptors of the sockets. */
    int flags;			/* ORed combination of the bitfields defined
				 * below. */



    Tcl_TcpAcceptProc *acceptProc;
				/* Proc to call on accept. */
    ClientData acceptProcData;	/* The data for the accept proc. */










};

/*
 * These bits may be ORed together into the "flags" field of a TcpState
 * structure.
 */

................................................................................

#define SOCKET_BUFSIZE	4096

/*
 * Static routines for this file:
 */

static TcpState *	CreateClientSocket(Tcl_Interp *interp, int port,
			    const char *host, const char *myaddr,
			    int myport, int async);
static void		TcpAccept(ClientData data, int mask);
static int		TcpBlockModeProc(ClientData data, int mode);
static int		TcpCloseProc(ClientData instanceData,
			    Tcl_Interp *interp);
static int		TcpClose2Proc(ClientData instanceData,
			    Tcl_Interp *interp, int flags);
static int		TcpGetHandleProc(ClientData instanceData,
................................................................................
    TcpState *statePtr = (TcpState *) instanceData;

    if (mode == TCL_MODE_BLOCKING) {
	CLEAR_BITS(statePtr->flags, TCP_ASYNC_SOCKET);
    } else {
	SET_BITS(statePtr->flags, TCP_ASYNC_SOCKET);
    }
    if (TclUnixSetBlockingMode(statePtr->fds->fd, mode) < 0) {
	return errno;
    }
    return 0;
}
 
/*
 *----------------------------------------------------------------------
................................................................................
    if (statePtr->flags & TCP_ASYNC_CONNECT) {
	if (statePtr->flags & TCP_ASYNC_SOCKET) {
	    timeOut = 0;
	} else {
	    timeOut = -1;
	}
	errno = 0;
	state = TclUnixWaitForFile(statePtr->fds->fd,
		TCL_WRITABLE | TCL_EXCEPTION, timeOut);
	if (state & TCL_EXCEPTION) {
	    return -1;
	}
	if (state & TCL_WRITABLE) {
	    CLEAR_BITS(statePtr->flags, TCP_ASYNC_CONNECT);
	} else if (timeOut == 0) {
................................................................................
    TcpState *statePtr = (TcpState *) instanceData;
    int bytesRead;

    *errorCodePtr = 0;
    if (WaitForConnect(statePtr, errorCodePtr) != 0) {
	return -1;
    }
    bytesRead = recv(statePtr->fds->fd, buf, (size_t) bufSize, 0);
    if (bytesRead > -1) {
	return bytesRead;
    }
    if (errno == ECONNRESET) {
	/*
	 * Turn ECONNRESET into a soft EOF condition.
	 */
................................................................................
    TcpState *statePtr = (TcpState *) instanceData;
    int written;

    *errorCodePtr = 0;
    if (WaitForConnect(statePtr, errorCodePtr) != 0) {
	return -1;
    }
    written = send(statePtr->fds->fd, buf, (size_t) toWrite, 0);
    if (written > -1) {
	return written;
    }
    *errorCodePtr = errno;
    return -1;
}
 
................................................................................
     * Delete a file handler that may be active for this socket if this is a
     * server socket - the file handler was created automatically by Tcl as
     * part of the mechanism to accept new client connections. Channel
     * handlers are already deleted in the generic IO channel closing code
     * that called this function, so we do not have to delete them here.
     */
    
    for (fds = statePtr->fds; fds != NULL; fds = statePtr->fds) {
	statePtr->fds = fds->next;
	Tcl_DeleteFileHandler(fds->fd);
	if (close(fds->fd) < 0) {
	    errorCode = errno;
	}



	ckfree(fds);






    }
    ckfree(statePtr);
    return errorCode;
}
 
/*
 *----------------------------------------------------------------------
................................................................................
    default:
        if (interp) {
            Tcl_AppendResult(interp,
                    "Socket close2proc called bidirectionally", NULL);
        }
        return TCL_ERROR;
    }
    if (shutdown(statePtr->fds->fd,sd) < 0) {
	errorCode = errno;
    }

    return errorCode;
}
 
/*
................................................................................
    }

    if ((len > 1) && (optionName[1] == 'e') &&
	    (strncmp(optionName, "-error", len) == 0)) {
	socklen_t optlen = sizeof(int);
	int err, ret;


	ret = getsockopt(statePtr->fds->fd, SOL_SOCKET, SO_ERROR,
		(char *)&err, &optlen);
	if (ret < 0) {
	    err = errno;
	}




	if (err != 0) {
	    Tcl_DStringAppend(dsPtr, Tcl_ErrnoMsg(err), -1);
	}
	return TCL_OK;
    }

    if (interp != NULL && Tcl_GetVar(interp, SUPPRESS_RDNS_VAR, 0) != NULL) {
................................................................................
    
    if ((len == 0) ||
	    ((len > 1) && (optionName[1] == 'p') &&
		    (strncmp(optionName, "-peername", len) == 0))) {
        address peername;
        socklen_t size = sizeof(peername);

	if (getpeername(statePtr->fds->fd, &peername.sa, &size) >= 0) {
	    if (len == 0) {
		Tcl_DStringAppendElement(dsPtr, "-peername");
		Tcl_DStringStartSublist(dsPtr);
	    }
            
	    getnameinfo(&peername.sa, size, host, sizeof(host), NULL, 0,
                    NI_NUMERICHOST);
................................................................................
        socklen_t size;
	int found = 0;

	if (len == 0) {
	    Tcl_DStringAppendElement(dsPtr, "-sockname");
	    Tcl_DStringStartSublist(dsPtr);
	}
	for (fds = statePtr->fds; fds != NULL; fds = fds->next) {
	    size = sizeof(sockname);
	    if (getsockname(fds->fd, &(sockname.sa), &size) >= 0) {
                int flags = reverseDNS;

		found = 1;
                getnameinfo(&sockname.sa, size, host, sizeof(host), NULL, 0,
                        NI_NUMERICHOST);
................................................................................
TcpWatchProc(
    ClientData instanceData,	/* The socket state. */
    int mask)			/* Events of interest; an OR-ed combination of
				 * TCL_READABLE, TCL_WRITABLE and
				 * TCL_EXCEPTION. */
{
    TcpState *statePtr = (TcpState *) instanceData;
    TcpFdList *fds;


    for (fds = statePtr->fds; fds != NULL; fds = fds->next) {


        if (mask) {
            Tcl_CreateFileHandler(fds->fd, mask,
                                  (Tcl_FileProc *) Tcl_NotifyChannel,
                                  (ClientData) statePtr->channel);
        } else {
            Tcl_DeleteFileHandler(fds->fd);
        }
    }
}
 
/*
 *----------------------------------------------------------------------
 *
 * TcpGetHandleProc --
................................................................................
TcpGetHandleProc(
    ClientData instanceData,	/* The socket state. */
    int direction,		/* Not used. */
    ClientData *handlePtr)	/* Where to store the handle. */
{
    TcpState *statePtr = (TcpState *) instanceData;

    *handlePtr = INT2PTR(statePtr->fds->fd);
    return TCL_OK;
}










 
/*
 *----------------------------------------------------------------------
 *
 * CreateSocket --
 *
 *	This function opens a new socket in client or server mode and
 *	initializes the TcpState structure.
 *
 * Results:

 *	Returns a new TcpState, or NULL with an error in the interp's result,
 *	if interp is not NULL.
 *
 * Side effects:
 *	Opens a socket.
 *
 *----------------------------------------------------------------------
 */

static TcpState *
CreateClientSocket(
    Tcl_Interp *interp,		/* For error reporting; can be NULL. */
    int port,			/* Port number to open. */
    const char *host,		/* Name of host on which to open port. */

    const char *myaddr,		/* Optional client-side address.
                                 * NULL implies INADDR_ANY/in6addr_any */
    int myport,			/* Optional client-side port */
    int async)			/* If nonzero and creating a client socket,
				 * attempt to do an async connect. Otherwise
				 * do a synchronous connect or bind. */
{
    int status = -1, connected = 0, sock = -1;
    struct addrinfo *addrlist = NULL, *addrPtr;
                                /* Socket address */
    struct addrinfo *myaddrlist = NULL, *myaddrPtr;
                                /* Socket address for client */
    TcpState *statePtr;
    const char *errorMsg = NULL;



    if (!TclCreateSocketAddress(interp, &addrlist, host, port, 0, &errorMsg)) {
	goto error;
    }
    if (!TclCreateSocketAddress(interp, &myaddrlist, myaddr, myport, 1, &errorMsg)) {
	goto error;


    }


    for (addrPtr = addrlist; addrPtr != NULL;
         addrPtr = addrPtr->ai_next) {
        for (myaddrPtr = myaddrlist; myaddrPtr != NULL;
             myaddrPtr = myaddrPtr->ai_next) {


            int reuseaddr;
            
	    /*
	     * No need to try combinations of local and remote addresses of
	     * different families.
	     */

	    if (myaddrPtr->ai_family != addrPtr->ai_family) {
		continue;
	    }










	    sock = socket(addrPtr->ai_family, SOCK_STREAM, 0);
	    if (sock < 0) {

		continue;
	    }

	    /*
	     * Set the close-on-exec flag so that the socket will not get
	     * inherited by child processes.
	     */
	    
	    fcntl(sock, F_SETFD, FD_CLOEXEC);
	    
	    /*
	     * Set kernel space buffering
	     */
	    
	    TclSockMinimumBuffers(INT2PTR(sock), SOCKET_BUFSIZE);
    
	    if (async) {
		status = TclUnixSetBlockingMode(sock, TCL_MODE_NONBLOCKING);
		if (status < 0) {
		    goto looperror;
		}
	    }

            reuseaddr = 1;
            (void) setsockopt(sock, SOL_SOCKET, SO_REUSEADDR,
                    (char *) &reuseaddr, sizeof(reuseaddr));
            status = bind(sock, myaddrPtr->ai_addr, myaddrPtr->ai_addrlen);

            if (status < 0) {
                goto looperror;

            }

	    /*
	     * Attempt to connect. The connect may fail at present with an
	     * EINPROGRESS but at a later time it will complete. The caller
	     * will set up a file handler on the socket if she is interested
	     * in being informed when the connect completes.
	     */
	    
	    status = connect(sock, addrPtr->ai_addr, addrPtr->ai_addrlen);

	    if (status < 0 && errno == EINPROGRESS) {















		status = 0;
	    }
	    if (status == 0) {
		connected = 1;
		break;

	    }
	looperror:
	    if (sock != -1) {
		close(sock);
		sock = -1;
	    }
	}
	if (connected) {
	    break;
	} 
	status = -1;
	if (sock >= 0) {
	    close(sock);
	    sock = -1;

	}
    }
    if (async) {
	/*
	 * Restore blocking mode.
	 */



	status = TclUnixSetBlockingMode(sock, TCL_MODE_BLOCKING);
    }

error:
    if (addrlist) {
	freeaddrinfo(addrlist);
    }
    if (myaddrlist) {
	freeaddrinfo(myaddrlist);
    }
    
    if (status < 0) {



	if (interp != NULL) {
	    Tcl_AppendResult(interp, "couldn't open socket: ",
		    Tcl_PosixError(interp), NULL);
	    if (errorMsg != NULL) {
		Tcl_AppendResult(interp, " (", errorMsg, ")", NULL);
	    }
	}
	if (sock != -1) {
	    close(sock);
	}
	return NULL;
    }

    /*
     * Allocate a new TcpState for this socket.
     */

    statePtr = ckalloc(sizeof(TcpState));
    statePtr->flags = async ? TCP_ASYNC_CONNECT : 0;
    statePtr->fds = ckalloc(sizeof(TcpFdList));
    memset(statePtr->fds, (int) 0, sizeof(TcpFdList));
    statePtr->fds->fd = sock;

    return statePtr;
}
 
/*
 *----------------------------------------------------------------------
 *
 * Tcl_OpenTcpClient --
 *
................................................................................
    const char *host,		/* Host on which to open port. */
    const char *myaddr,		/* Client-side address */
    int myport,			/* Client-side port */
    int async)			/* If nonzero, attempt to do an asynchronous
				 * connect. Otherwise we do a blocking
				 * connect. */
{
    TcpState *statePtr;


    char channelName[16 + TCL_INTEGER_SPACE];

    /*
     * Create a new client socket and wrap it in a channel.

     */





    statePtr = CreateClientSocket(interp, port, host, myaddr, myport, async);
    if (statePtr == NULL) {






	return NULL;
    }

    statePtr->acceptProc = NULL;
    statePtr->acceptProcData = NULL;


















    sprintf(channelName, "sock%d", statePtr->fds->fd);

    statePtr->channel = Tcl_CreateChannel(&tcpChannelType, channelName,
	    statePtr, (TCL_READABLE | TCL_WRITABLE));
    if (Tcl_SetChannelOption(interp, statePtr->channel, "-translation",
	    "auto crlf") == TCL_ERROR) {
	Tcl_Close(NULL, statePtr->channel);
	return NULL;
    }
    return statePtr->channel;
}
 
/*
 *----------------------------------------------------------------------
 *
 * Tcl_MakeTcpClientChannel --
 *
................................................................................
Tcl_Channel
TclpMakeTcpClientChannelMode(
    ClientData sock,		/* The socket to wrap up into a channel. */
    int mode)			/* ORed combination of TCL_READABLE and
				 * TCL_WRITABLE to indicate file mode. */
{
    TcpState *statePtr;
    char channelName[16 + TCL_INTEGER_SPACE];

    statePtr = ckalloc(sizeof(TcpState));
    statePtr->fds = ckalloc(sizeof(TcpFdList));
    memset(statePtr->fds, (int) 0, sizeof(TcpFdList));
    statePtr->fds->fd = PTR2INT(sock);
    statePtr->flags = 0;
    statePtr->acceptProc = NULL;
    statePtr->acceptProcData = NULL;

    sprintf(channelName, "sock%d", statePtr->fds->fd);

    statePtr->channel = Tcl_CreateChannel(&tcpChannelType, channelName,
	    statePtr, mode);
    if (Tcl_SetChannelOption(NULL, statePtr->channel, "-translation",
	    "auto crlf") == TCL_ERROR) {
	Tcl_Close(NULL, statePtr->channel);
	return NULL;
................................................................................
				/* Callback for accepting connections from new
				 * clients. */
    ClientData acceptProcData)	/* Data for the callback. */
{
    int status = 0, sock = -1, reuseaddr = 1, chosenport = 0;
    struct addrinfo *addrlist = NULL, *addrPtr;	/* socket address */
    TcpState *statePtr = NULL;
    char channelName[16 + TCL_INTEGER_SPACE];
    const char *errorMsg = NULL;
    TcpFdList *fds = NULL, *newfds;

    if (!TclCreateSocketAddress(interp, &addrlist, myHost, port, 1, &errorMsg)) {
	goto error;
    }

................................................................................
            }
        }
        status = listen(sock, SOMAXCONN);
        if (status < 0) {
            close(sock);
            continue;
        }
        newfds = ckalloc(sizeof(TcpFdList));
        memset(newfds, (int) 0, sizeof(TcpFdList));
        if (statePtr == NULL) {
            /*
             * Allocate a new TcpState for this socket.
             */
            
            statePtr = ckalloc(sizeof(TcpState));
            statePtr->fds = newfds;
            statePtr->acceptProc = acceptProc;
            statePtr->acceptProcData = acceptProcData;
            sprintf(channelName, "sock%d", sock);

        } else {


            fds->next = newfds;
        }
        newfds->fd = sock;
        newfds->statePtr = statePtr;
        fds = newfds;
	
        /*
................................................................................
    int mask)			/* Not used. */
{
    TcpFdList *fds = data;	/* Client data of server socket. */
    int newsock;		/* The new client socket */
    TcpState *newSockState;	/* State for new socket. */
    address addr;		/* The remote address */
    socklen_t len;		/* For accept interface */
    char channelName[16 + TCL_INTEGER_SPACE];
    char host[NI_MAXHOST], port[NI_MAXSERV];
    
    len = sizeof(addr);
    newsock = accept(fds->fd, &(addr.sa), &len);
    if (newsock < 0) {
	return;
    }
................................................................................
     * Set close-on-exec flag to prevent the newly accepted socket from being
     * inherited by child processes.
     */

    (void) fcntl(newsock, F_SETFD, FD_CLOEXEC);

    newSockState = ckalloc(sizeof(TcpState));


    newSockState->flags = 0;
    newSockState->fds = ckalloc(sizeof(TcpFdList));
    memset(newSockState->fds, (int) 0, sizeof(TcpFdList));
    newSockState->fds->fd = newsock;
    newSockState->acceptProc = NULL;
    newSockState->acceptProcData = NULL;

    sprintf(channelName, "sock%d", newsock);
    newSockState->channel = Tcl_CreateChannel(&tcpChannelType, channelName,
	    newSockState, (TCL_READABLE | TCL_WRITABLE));

    Tcl_SetChannelOption(NULL, newSockState->channel, "-translation",
	    "auto crlf");

    if (fds->statePtr->acceptProc != NULL) {






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 * what they say on the tin. :-) They also only ever refer to their arguments
 * once, and so can be used without regard to side effects.
 */

#define SET_BITS(var, bits)	((var) |= (bits))
#define CLEAR_BITS(var, bits)	((var) &= ~(bits))

/* "sock" + a pointer in hex + \0 */
#define SOCK_CHAN_LENGTH 4 + sizeof(void*) * 2 + 1
#define SOCK_TEMPLATE "sock%lx"

/*
 * This is needed to comply with the strict aliasing rules of GCC, but it also
 * simplifies casting between the different sockaddr types.
 */

typedef union {
    struct sockaddr sa;
................................................................................
    TcpState *statePtr;
    int fd;
    struct TcpFdList *next;
} TcpFdList;

struct TcpState {
    Tcl_Channel channel;	/* Channel associated with this file. */
    TcpFdList fds;		/* The file descriptors of the sockets. */
    int flags;			/* ORed combination of the bitfields defined
				 * below. */
    /*
     * Only needed for server sockets
     */
    Tcl_TcpAcceptProc *acceptProc; /* Proc to call on accept. */

    ClientData acceptProcData;     /* The data for the accept proc. */
    /*
     * Only needed for client sockets
     */
    struct addrinfo *addrlist;	 /* addresses to connect to        */
    struct addrinfo *addr;	 /* iterator over addrlist         */
    struct addrinfo *myaddrlist; /* local address                  */
    struct addrinfo *myaddr;	 /* iterator over myaddrlist       */
    int filehandlers;	/* Caches FileHandlers that get set up while
                         * an async socket is not yet connected   */
    int status;         /* Cache status of async socket */
};

/*
 * These bits may be ORed together into the "flags" field of a TcpState
 * structure.
 */

................................................................................

#define SOCKET_BUFSIZE	4096

/*
 * Static routines for this file:
 */

static int		CreateClientSocket(Tcl_Interp *interp,
                                           TcpState *state);

static void		TcpAccept(ClientData data, int mask);
static int		TcpBlockModeProc(ClientData data, int mode);
static int		TcpCloseProc(ClientData instanceData,
			    Tcl_Interp *interp);
static int		TcpClose2Proc(ClientData instanceData,
			    Tcl_Interp *interp, int flags);
static int		TcpGetHandleProc(ClientData instanceData,
................................................................................
    TcpState *statePtr = (TcpState *) instanceData;

    if (mode == TCL_MODE_BLOCKING) {
	CLEAR_BITS(statePtr->flags, TCP_ASYNC_SOCKET);
    } else {
	SET_BITS(statePtr->flags, TCP_ASYNC_SOCKET);
    }
    if (TclUnixSetBlockingMode(statePtr->fds.fd, mode) < 0) {
	return errno;
    }
    return 0;
}
 
/*
 *----------------------------------------------------------------------
................................................................................
    if (statePtr->flags & TCP_ASYNC_CONNECT) {
	if (statePtr->flags & TCP_ASYNC_SOCKET) {
	    timeOut = 0;
	} else {
	    timeOut = -1;
	}
	errno = 0;
	state = TclUnixWaitForFile(statePtr->fds.fd,
		TCL_WRITABLE | TCL_EXCEPTION, timeOut);
	if (state & TCL_EXCEPTION) {
	    return -1;
	}
	if (state & TCL_WRITABLE) {
	    CLEAR_BITS(statePtr->flags, TCP_ASYNC_CONNECT);
	} else if (timeOut == 0) {
................................................................................
    TcpState *statePtr = (TcpState *) instanceData;
    int bytesRead;

    *errorCodePtr = 0;
    if (WaitForConnect(statePtr, errorCodePtr) != 0) {
	return -1;
    }
    bytesRead = recv(statePtr->fds.fd, buf, (size_t) bufSize, 0);
    if (bytesRead > -1) {
	return bytesRead;
    }
    if (errno == ECONNRESET) {
	/*
	 * Turn ECONNRESET into a soft EOF condition.
	 */
................................................................................
    TcpState *statePtr = (TcpState *) instanceData;
    int written;

    *errorCodePtr = 0;
    if (WaitForConnect(statePtr, errorCodePtr) != 0) {
	return -1;
    }
    written = send(statePtr->fds.fd, buf, (size_t) toWrite, 0);
    if (written > -1) {
	return written;
    }
    *errorCodePtr = errno;
    return -1;
}
 
................................................................................
     * Delete a file handler that may be active for this socket if this is a
     * server socket - the file handler was created automatically by Tcl as
     * part of the mechanism to accept new client connections. Channel
     * handlers are already deleted in the generic IO channel closing code
     * that called this function, so we do not have to delete them here.
     */
    
    for (fds = &statePtr->fds; fds != NULL; fds = fds->next) {

	Tcl_DeleteFileHandler(fds->fd);
	if (close(fds->fd) < 0) {
	    errorCode = errno;
	}
    
    }
    for (fds = statePtr->fds.next; fds != NULL; fds = fds->next) {
        ckfree(fds);
    }
    if (statePtr->addrlist != NULL) {
        freeaddrinfo(statePtr->addrlist);
    }
    if (statePtr->myaddrlist != NULL) {
        freeaddrinfo(statePtr->myaddrlist);
    }
    ckfree(statePtr);
    return errorCode;
}
 
/*
 *----------------------------------------------------------------------
................................................................................
    default:
        if (interp) {
            Tcl_AppendResult(interp,
                    "Socket close2proc called bidirectionally", NULL);
        }
        return TCL_ERROR;
    }
    if (shutdown(statePtr->fds.fd,sd) < 0) {
	errorCode = errno;
    }

    return errorCode;
}
 
/*
................................................................................
    }

    if ((len > 1) && (optionName[1] == 'e') &&
	    (strncmp(optionName, "-error", len) == 0)) {
	socklen_t optlen = sizeof(int);
	int err, ret;

        if (statePtr->status == 0) {
            ret = getsockopt(statePtr->fds.fd, SOL_SOCKET, SO_ERROR,
                             (char *)&err, &optlen);
            if (ret < 0) {
                err = errno;
            }
        } else {
            err = statePtr->status;
            statePtr->status = 0;
        }
	if (err != 0) {
	    Tcl_DStringAppend(dsPtr, Tcl_ErrnoMsg(err), -1);
	}
	return TCL_OK;
    }

    if (interp != NULL && Tcl_GetVar(interp, SUPPRESS_RDNS_VAR, 0) != NULL) {
................................................................................
    
    if ((len == 0) ||
	    ((len > 1) && (optionName[1] == 'p') &&
		    (strncmp(optionName, "-peername", len) == 0))) {
        address peername;
        socklen_t size = sizeof(peername);

	if (getpeername(statePtr->fds.fd, &peername.sa, &size) >= 0) {
	    if (len == 0) {
		Tcl_DStringAppendElement(dsPtr, "-peername");
		Tcl_DStringStartSublist(dsPtr);
	    }
            
	    getnameinfo(&peername.sa, size, host, sizeof(host), NULL, 0,
                    NI_NUMERICHOST);
................................................................................
        socklen_t size;
	int found = 0;

	if (len == 0) {
	    Tcl_DStringAppendElement(dsPtr, "-sockname");
	    Tcl_DStringStartSublist(dsPtr);
	}
	for (fds = &statePtr->fds; fds != NULL; fds = fds->next) {
	    size = sizeof(sockname);
	    if (getsockname(fds->fd, &(sockname.sa), &size) >= 0) {
                int flags = reverseDNS;

		found = 1;
                getnameinfo(&sockname.sa, size, host, sizeof(host), NULL, 0,
                        NI_NUMERICHOST);
................................................................................
TcpWatchProc(
    ClientData instanceData,	/* The socket state. */
    int mask)			/* Events of interest; an OR-ed combination of
				 * TCL_READABLE, TCL_WRITABLE and
				 * TCL_EXCEPTION. */
{
    TcpState *statePtr = (TcpState *) instanceData;

     
    if (statePtr->flags & TCP_ASYNC_CONNECT) {
        /* Async sockets use a FileHandler internally while connecting, so we
         * need to cache this request until the connection has succeeded. */
        statePtr->filehandlers = mask;
    } else if (mask) {
        Tcl_CreateFileHandler(statePtr->fds.fd, mask,
                              (Tcl_FileProc *) Tcl_NotifyChannel,
                              (ClientData) statePtr->channel);
    } else {
        Tcl_DeleteFileHandler(statePtr->fds.fd);

    }
}
 
/*
 *----------------------------------------------------------------------
 *
 * TcpGetHandleProc --
................................................................................
TcpGetHandleProc(
    ClientData instanceData,	/* The socket state. */
    int direction,		/* Not used. */
    ClientData *handlePtr)	/* Where to store the handle. */
{
    TcpState *statePtr = (TcpState *) instanceData;

    *handlePtr = INT2PTR(statePtr->fds.fd);
    return TCL_OK;
}
 
static void
TcpAsyncCallback(
    ClientData clientData,	/* The socket state. */
    int mask)			/* Events of interest; an OR-ed combination of
				 * TCL_READABLE, TCL_WRITABLE and
				 * TCL_EXCEPTION. */
{
    CreateClientSocket(NULL, clientData);
}
 
/*
 *----------------------------------------------------------------------
 *
 * CreateClientSocket --
 *
 *	This function opens a new socket in client mode.

 *
 * Results:
 *      TCL_OK, if the socket was successfully connected or an asynchronous
 *      connection is in progress. If an error occurs, TCL_ERROR is returned
 *      and an error message is left in interp.
 *
 * Side effects:
 *	Opens a socket.
 *
 *----------------------------------------------------------------------
 */

static int
CreateClientSocket(
    Tcl_Interp *interp,		/* For error reporting; can be NULL. */
    TcpState *state)

{
    socklen_t optlen;
    int in_coro = (state->addr != NULL);
    int status;
    int async = state->flags & TCP_ASYNC_CONNECT;










    if (in_coro) {
        goto coro_continue;
    }


    


    for (state->addr = state->addrlist; state->addr != NULL;
         state->addr = state->addr->ai_next) {

	status = -1;





        for (state->myaddr = state->myaddrlist; state->myaddr != NULL;
             state->myaddr = state->myaddr->ai_next) {
            int reuseaddr;
            
	    /*
	     * No need to try combinations of local and remote addresses of
	     * different families.
	     */

	    if (state->myaddr->ai_family != state->addr->ai_family) {
		continue;
	    }

            /*
             * Close the socket if it is still open from the last unsuccessful
             * iteration.
             */
            if (state->fds.fd >= 0) {
		close(state->fds.fd);
		state->fds.fd = -1;
	    }

	    state->fds.fd = socket(state->addr->ai_family, SOCK_STREAM, 0);

	    if (state->fds.fd < 0) {
		continue;
	    }

	    /*
	     * Set the close-on-exec flag so that the socket will not get
	     * inherited by child processes.
	     */
	    
	    fcntl(state->fds.fd, F_SETFD, FD_CLOEXEC);
	    
	    /*
	     * Set kernel space buffering
	     */
	    
	    TclSockMinimumBuffers(INT2PTR(state->fds.fd), SOCKET_BUFSIZE);
    
	    if (async) {
		status = TclUnixSetBlockingMode(state->fds.fd, TCL_MODE_NONBLOCKING);
		if (status < 0) {
                    continue;
		}
	    }

            reuseaddr = 1;
            (void) setsockopt(state->fds.fd, SOL_SOCKET, SO_REUSEADDR,
                    (char *) &reuseaddr, sizeof(reuseaddr));
            status = bind(state->fds.fd, state->myaddr->ai_addr,
                          state->myaddr->ai_addrlen);
            if (status < 0) {

                continue;
            }

	    /*
	     * Attempt to connect. The connect may fail at present with an
	     * EINPROGRESS but at a later time it will complete. The caller
	     * will set up a file handler on the socket if she is interested
	     * in being informed when the connect completes.
	     */
	    
	    status = connect(state->fds.fd, state->addr->ai_addr,
                             state->addr->ai_addrlen);
	    if (status < 0 && errno == EINPROGRESS) {
                Tcl_CreateFileHandler(state->fds.fd,
                                      TCL_WRITABLE | TCL_EXCEPTION,
                                      TcpAsyncCallback, state);
                return TCL_OK;

            coro_continue:
                Tcl_DeleteFileHandler(state->fds.fd);
                /*
                 * Read the error state from the socket, to see if the async
                 * connection has succeeded or failed and store the status in
                 * the socket state for later retrieval by [fconfigure -error]
                 */
                optlen = sizeof(int);
                getsockopt(state->fds.fd, SOL_SOCKET, SO_ERROR,
                           (char *)&status, &optlen);
                state->status = status;
            }
	    if (status == 0) {


                goto out;
	    }




	}
    }







out:


    if (async) {




        CLEAR_BITS(state->flags, TCP_ASYNC_CONNECT);
        TcpWatchProc(state, state->filehandlers);
        TclUnixSetBlockingMode(state->fds.fd, TCL_MODE_BLOCKING);
    }









    if (status < 0) {
        if (in_coro) {
            Tcl_NotifyChannel(state->channel, TCL_WRITABLE);
        } else {
            if (interp != NULL) {
                Tcl_AppendResult(interp, "couldn't open socket: ",
                                 Tcl_PosixError(interp), NULL);


            }




            return TCL_ERROR;
        }
    }










    return TCL_OK;
}
 
/*
 *----------------------------------------------------------------------
 *
 * Tcl_OpenTcpClient --
 *
................................................................................
    const char *host,		/* Host on which to open port. */
    const char *myaddr,		/* Client-side address */
    int myport,			/* Client-side port */
    int async)			/* If nonzero, attempt to do an asynchronous
				 * connect. Otherwise we do a blocking
				 * connect. */
{
    TcpState *state;
    const char *errorMsg = NULL;
    struct addrinfo *addrlist = NULL, *myaddrlist = NULL;
    char channelName[SOCK_CHAN_LENGTH];

    /*

     * Do the name lookups for the local and remote addresses.
     */
    if (!TclCreateSocketAddress(interp, &addrlist, host, port, 0, &errorMsg) ||
        !TclCreateSocketAddress(interp, &myaddrlist, myaddr, myport, 1, &errorMsg)) {
        if (addrlist != NULL) {
            freeaddrinfo(addrlist);
        }

        if (interp != NULL) {
            Tcl_AppendResult(interp, "couldn't open socket: ",
                             Tcl_PosixError(interp), NULL);
            if (errorMsg != NULL) {
                Tcl_AppendResult(interp, " (", errorMsg, ")", NULL);
            }
        }
        return NULL;
    }



    /*
     * Allocate a new TcpState for this socket.
     */
    state = ckalloc(sizeof(TcpState));
    memset(state, 0, sizeof(TcpState));
    state->flags = async ? TCP_ASYNC_CONNECT : 0;
    state->addrlist = addrlist;
    state->myaddrlist = myaddrlist;
    state->fds.fd = -1;

    /*
     * Create a new client socket and wrap it in a channel.
     */
    if (CreateClientSocket(interp, state) != TCL_OK) {
        TcpCloseProc(state, NULL);
        return NULL;
    }

    sprintf(channelName, SOCK_TEMPLATE, (long)state);

    state->channel = Tcl_CreateChannel(&tcpChannelType, channelName,
                                       state, (TCL_READABLE | TCL_WRITABLE));
    if (Tcl_SetChannelOption(interp, state->channel, "-translation",
	    "auto crlf") == TCL_ERROR) {
	Tcl_Close(NULL, state->channel);
	return NULL;
    }
    return state->channel;
}
 
/*
 *----------------------------------------------------------------------
 *
 * Tcl_MakeTcpClientChannel --
 *
................................................................................
Tcl_Channel
TclpMakeTcpClientChannelMode(
    ClientData sock,		/* The socket to wrap up into a channel. */
    int mode)			/* ORed combination of TCL_READABLE and
				 * TCL_WRITABLE to indicate file mode. */
{
    TcpState *statePtr;
    char channelName[SOCK_CHAN_LENGTH];

    statePtr = ckalloc(sizeof(TcpState));
    memset(statePtr, 0, sizeof(TcpState));

    statePtr->fds.fd = PTR2INT(sock);
    statePtr->flags = 0;



    sprintf(channelName, SOCK_TEMPLATE, (long)statePtr);

    statePtr->channel = Tcl_CreateChannel(&tcpChannelType, channelName,
	    statePtr, mode);
    if (Tcl_SetChannelOption(NULL, statePtr->channel, "-translation",
	    "auto crlf") == TCL_ERROR) {
	Tcl_Close(NULL, statePtr->channel);
	return NULL;
................................................................................
				/* Callback for accepting connections from new
				 * clients. */
    ClientData acceptProcData)	/* Data for the callback. */
{
    int status = 0, sock = -1, reuseaddr = 1, chosenport = 0;
    struct addrinfo *addrlist = NULL, *addrPtr;	/* socket address */
    TcpState *statePtr = NULL;
    char channelName[SOCK_CHAN_LENGTH];
    const char *errorMsg = NULL;
    TcpFdList *fds = NULL, *newfds;

    if (!TclCreateSocketAddress(interp, &addrlist, myHost, port, 1, &errorMsg)) {
	goto error;
    }

................................................................................
            }
        }
        status = listen(sock, SOMAXCONN);
        if (status < 0) {
            close(sock);
            continue;
        }


        if (statePtr == NULL) {
            /*
             * Allocate a new TcpState for this socket.
             */
            
            statePtr = ckalloc(sizeof(TcpState));
            memset(statePtr, 0, sizeof(TcpState));
            statePtr->acceptProc = acceptProc;
            statePtr->acceptProcData = acceptProcData;
            sprintf(channelName, SOCK_TEMPLATE, (long)statePtr);
            newfds = &statePtr->fds;
        } else {
            newfds = ckalloc(sizeof(TcpFdList));
            memset(newfds, (int) 0, sizeof(TcpFdList));
            fds->next = newfds;
        }
        newfds->fd = sock;
        newfds->statePtr = statePtr;
        fds = newfds;
	
        /*
................................................................................
    int mask)			/* Not used. */
{
    TcpFdList *fds = data;	/* Client data of server socket. */
    int newsock;		/* The new client socket */
    TcpState *newSockState;	/* State for new socket. */
    address addr;		/* The remote address */
    socklen_t len;		/* For accept interface */
    char channelName[SOCK_CHAN_LENGTH];
    char host[NI_MAXHOST], port[NI_MAXSERV];
    
    len = sizeof(addr);
    newsock = accept(fds->fd, &(addr.sa), &len);
    if (newsock < 0) {
	return;
    }
................................................................................
     * Set close-on-exec flag to prevent the newly accepted socket from being
     * inherited by child processes.
     */

    (void) fcntl(newsock, F_SETFD, FD_CLOEXEC);

    newSockState = ckalloc(sizeof(TcpState));

    memset(newSockState, 0, sizeof(TcpState));
    newSockState->flags = 0;


    newSockState->fds.fd = newsock;



    sprintf(channelName, SOCK_TEMPLATE, (long)newSockState);
    newSockState->channel = Tcl_CreateChannel(&tcpChannelType, channelName,
	    newSockState, (TCL_READABLE | TCL_WRITABLE));

    Tcl_SetChannelOption(NULL, newSockState->channel, "-translation",
	    "auto crlf");

    if (fds->statePtr->acceptProc != NULL) {