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