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/*
* 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.
*
* SCCS: @(#) tclIOSock.c 1.20 97/04/25 16:36:40
*/
#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 *)¤t, &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 *)¤t, &len);
if (current < size) {
len = sizeof(int);
setsockopt(sock, SOL_SOCKET, SO_RCVBUF, (char *)&size, len);
}
return TCL_OK;
}
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