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