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/*
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* tclIOSock.c --
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*
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* Common routines used by all socket based channel types.
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*
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* Copyright (c) 1995-1997 Sun Microsystems, Inc.
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*
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* See the file "license.terms" for information on usage and redistribution
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* of this file, and for a DISCLAIMER OF ALL WARRANTIES.
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*
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* RCS: @(#) $Id: tclIOSock.c,v 1.7 2002/07/29 16:54:41 rmax Exp $
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*/
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#include "tclInt.h"
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#include "tclPort.h"
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/*
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*---------------------------------------------------------------------------
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*
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* TclSockGetPort --
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*
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* Maps from a string, which could be a service name, to a port.
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* Used by socket creation code to get port numbers and resolve
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* registered service names to port numbers.
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*
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* Results:
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* A standard Tcl result. On success, the port number is returned
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* in portPtr. On failure, an error message is left in the interp's
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* result.
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*
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* Side effects:
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* None.
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*
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*---------------------------------------------------------------------------
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*/
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int
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TclSockGetPort(interp, string, proto, portPtr)
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Tcl_Interp *interp;
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char *string; /* Integer or service name */
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char *proto; /* "tcp" or "udp", typically */
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int *portPtr; /* Return port number */
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{
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struct servent *sp; /* Protocol info for named services */
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Tcl_DString ds;
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CONST char *native;
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if (Tcl_GetInt(NULL, string, portPtr) != TCL_OK) {
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/*
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* Don't bother translating 'proto' to native.
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*/
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native = Tcl_UtfToExternalDString(NULL, string, -1, &ds);
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sp = getservbyname(native, proto); /* INTL: Native. */
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Tcl_DStringFree(&ds);
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if (sp != NULL) {
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*portPtr = ntohs((unsigned short) sp->s_port);
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return TCL_OK;
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}
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}
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if (Tcl_GetInt(interp, string, portPtr) != TCL_OK) {
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return TCL_ERROR;
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}
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if (*portPtr > 0xFFFF) {
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Tcl_AppendResult(interp, "couldn't open socket: port number too high",
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(char *) NULL);
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return TCL_ERROR;
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}
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return TCL_OK;
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}
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/*
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*----------------------------------------------------------------------
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*
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* TclSockMinimumBuffers --
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*
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* Ensure minimum buffer sizes (non zero).
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*
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* Results:
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* A standard Tcl result.
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*
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* Side effects:
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* Sets SO_SNDBUF and SO_RCVBUF sizes.
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*
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*----------------------------------------------------------------------
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*/
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int
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TclSockMinimumBuffers(sock, size)
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int sock; /* Socket file descriptor */
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int size; /* Minimum buffer size */
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{
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int current;
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socklen_t len;
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len = sizeof(int);
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getsockopt(sock, SOL_SOCKET, SO_SNDBUF, (char *)¤t, &len);
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if (current < size) {
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len = sizeof(int);
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setsockopt(sock, SOL_SOCKET, SO_SNDBUF, (char *)&size, len);
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}
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len = sizeof(int);
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getsockopt(sock, SOL_SOCKET, SO_RCVBUF, (char *)¤t, &len);
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if (current < size) {
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len = sizeof(int);
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setsockopt(sock, SOL_SOCKET, SO_RCVBUF, (char *)&size, len);
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}
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return TCL_OK;
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}
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