Subversion Repositories or1k

/*

 * tclIOSock.c --

 *

 *      Common routines used by all socket based channel types.

 *

 * Copyright (c) 1995 Sun Microsystems, Inc.

 *

 * See the file "license.terms" for information on usage and redistribution

 * of this file, and for a DISCLAIMER OF ALL WARRANTIES.

 *

 * RCS: @(#) $Id: tclIOSock.c,v 1.1.1.1 2002-01-16 10:25:27 markom Exp $

 */

#include "tclInt.h"

#include "tclPort.h"

/*

 *----------------------------------------------------------------------

 *

 * TclSockGetPort --

 *

 *      Maps from a string, which could be a service name, to a port.

 *      Used by socket creation code to get port numbers and resolve

 *      registered service names to port numbers.

 *

 * Results:

 *      A standard Tcl result.  On success, the port number is

 *      returned in portPtr. On failure, an error message is left in

 *      interp->result.

 *

 * Side effects:

 *      None.

 *

 *----------------------------------------------------------------------

 */

int

TclSockGetPort(interp, string, proto, portPtr)

    Tcl_Interp *interp;

    char *string;               /* Integer or service name */

    char *proto;                /* "tcp" or "udp", typically */

    int *portPtr;               /* Return port number */

{

    struct servent *sp;         /* Protocol info for named services */

    if (Tcl_GetInt(interp, string, portPtr) != TCL_OK) {

        sp = getservbyname(string, proto);

        if (sp != NULL) {

            *portPtr = ntohs((unsigned short) sp->s_port);

            Tcl_ResetResult(interp);    /* clear error message */

            return TCL_OK;

        }

        return TCL_ERROR;

    }

    if (Tcl_GetInt(interp, string, portPtr) != TCL_OK) {

        return TCL_ERROR;

    }

    if (*portPtr > 0xFFFF) {

        Tcl_AppendResult(interp, "couldn't open socket: port number too high",

                (char *) NULL);

        return TCL_ERROR;

    }

    return TCL_OK;

}

/*

 *----------------------------------------------------------------------

 *

 * TclSockMinimumBuffers --

 *

 *      Ensure minimum buffer sizes (non zero).

 *

 * Results:

 *      A standard Tcl result.

 *

 * Side effects:

 *      Sets SO_SNDBUF and SO_RCVBUF sizes.

 *

 *----------------------------------------------------------------------

 */

int

TclSockMinimumBuffers(sock, size)

    int sock;                   /* Socket file descriptor */

    int size;                   /* Minimum buffer size */

{

    int current;

    int len;

    len = sizeof(int);

    getsockopt(sock, SOL_SOCKET, SO_SNDBUF, (char *)&current, &len);

    if (current < size) {

        len = sizeof(int);

        setsockopt(sock, SOL_SOCKET, SO_SNDBUF, (char *)&size, len);

    }

    len = sizeof(int);

    getsockopt(sock, SOL_SOCKET, SO_RCVBUF, (char *)&current, &len);

    if (current < size) {

        len = sizeof(int);

        setsockopt(sock, SOL_SOCKET, SO_RCVBUF, (char *)&size, len);

    }

    return TCL_OK;

}