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/*
* tclIOSock.c --
*
* Common routines used by all socket based channel types.
*
* Copyright (c) 1995-1997 Sun Microsystems, Inc.
*
* See the file "license.terms" for information on usage and redistribution of
* this file, and for a DISCLAIMER OF ALL WARRANTIES.
*/
#include "tclInt.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 the interp's result.
*
* Side effects:
* None.
*
*---------------------------------------------------------------------------
*/
int
TclSockGetPort(
Tcl_Interp *interp,
const char *string, /* Integer or service name */
const char *proto, /* "tcp" or "udp", typically */
int *portPtr) /* Return port number */
{
struct servent *sp; /* Protocol info for named services */
Tcl_DString ds;
const char *native;
if (Tcl_GetInt(NULL, string, portPtr) != TCL_OK) {
/*
* Don't bother translating 'proto' to native.
*/
native = Tcl_UtfToExternalDString(NULL, string, -1, &ds);
sp = getservbyname(native, proto); /* INTL: Native. */
Tcl_DStringFree(&ds);
if (sp != NULL) {
*portPtr = ntohs((unsigned short) sp->s_port);
return TCL_OK;
}
}
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",
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(
int sock, /* Socket file descriptor */
int size) /* Minimum buffer size */
{
int current;
socklen_t 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;
}
/*
* Local Variables:
* mode: c
* c-basic-offset: 4
* fill-column: 78
* End:
*/
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