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/*
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* tclUnixSock.c --
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*
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* This file contains Unix-specific socket related code.
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*
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* Copyright (c) 1995 Sun Microsystems, Inc.
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* Portions Copyright (c) 2007-2008 Nokia Corporation and/or its subsidiaries. All rights reserved.
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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: tclUnixSock.c,v 1.6.2.4 2006/09/07 09:01:07 vasiljevic Exp $
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*/
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#include "tcl.h"
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#include "tclPort.h"
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/*
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* There is no portable macro for the maximum length
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* of host names returned by gethostbyname(). We should only
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* trust SYS_NMLN if it is at least 255 + 1 bytes to comply with DNS
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* host name limits.
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*
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* Note: SYS_NMLN is a restriction on "uname" not on gethostbyname!
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*
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* For example HP-UX 10.20 has SYS_NMLN == 9, while gethostbyname()
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* can return a fully qualified name from DNS of up to 255 bytes.
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*
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* Fix suggested by Viktor Dukhovni (viktor@esm.com)
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*/
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#if defined(SYS_NMLN) && SYS_NMLEN >= 256
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#define TCL_HOSTNAME_LEN SYS_NMLEN
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#else
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#define TCL_HOSTNAME_LEN 256
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#endif
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/*
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* The following variable holds the network name of this host.
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*/
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static char hostname[TCL_HOSTNAME_LEN + 1];
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static int hostnameInited = 0;
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TCL_DECLARE_MUTEX(hostMutex)
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/*
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*----------------------------------------------------------------------
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*
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* Tcl_GetHostName --
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*
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* Returns the name of the local host.
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*
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* Results:
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* A string containing the network name for this machine, or
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* an empty string if we can't figure out the name. The caller
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* must not modify or free this string.
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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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EXPORT_C CONST char *
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Tcl_GetHostName()
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{
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#ifndef NO_UNAME
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struct utsname u;
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struct hostent *hp;
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#else
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char buffer[sizeof(hostname)];
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#endif
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CONST char *native;
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Tcl_MutexLock(&hostMutex);
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if (hostnameInited) {
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Tcl_MutexUnlock(&hostMutex);
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return hostname;
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}
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native = NULL;
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#ifndef NO_UNAME
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(VOID *) memset((VOID *) &u, (int) 0, sizeof(struct utsname));
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if (uname(&u) > -1) { /* INTL: Native. */
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hp = TclpGetHostByName(u.nodename); /* INTL: Native. */
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if (hp == NULL) {
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/*
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* Sometimes the nodename is fully qualified, but gets truncated
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* as it exceeds SYS_NMLN. See if we can just get the immediate
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* nodename and get a proper answer that way.
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*/
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char *dot = strchr(u.nodename, '.');
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if (dot != NULL) {
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char *node = ckalloc((unsigned) (dot - u.nodename + 1));
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memcpy(node, u.nodename, (size_t) (dot - u.nodename));
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node[dot - u.nodename] = '\0';
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hp = TclpGetHostByName(node);
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ckfree(node);
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}
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}
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if (hp != NULL) {
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native = hp->h_name;
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} else {
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native = u.nodename;
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}
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}
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#else
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/*
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* Uname doesn't exist; try gethostname instead.
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*/
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if (gethostname(buffer, sizeof(buffer)) > -1) { /* INTL: Native. */
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native = buffer;
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}
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#endif
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if (native == NULL) {
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hostname[0] = 0;
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} else {
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Tcl_ExternalToUtf(NULL, NULL, native, -1, 0, NULL, hostname,
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sizeof(hostname), NULL, NULL, NULL);
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}
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hostnameInited = 1;
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Tcl_MutexUnlock(&hostMutex);
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return hostname;
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}
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/*
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*----------------------------------------------------------------------
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*
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* TclpHasSockets --
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*
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* Detect if sockets are available on this platform.
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*
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* Results:
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* Returns TCL_OK.
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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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TclpHasSockets(interp)
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Tcl_Interp *interp; /* Not used. */
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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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* TclpFinalizeSockets --
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*
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* Performs per-thread socket subsystem finalization.
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*
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* Results:
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* None.
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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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void
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TclpFinalizeSockets()
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{
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return;
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}
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