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/*
* tclUnixSock.c --
*
* This file contains Unix-specific socket related code.
*
* 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.
*
* RCS: @(#) $Id: tclUnixSock.c,v 1.14 2005/11/11 23:46:36 dkf Exp $
*/
#include "tclInt.h"
/*
* The following variable holds the network name of this host.
*/
static TclInitProcessGlobalValueProc InitializeHostName;
static ProcessGlobalValue hostName =
{0, 0, NULL, NULL, InitializeHostName, NULL, NULL};
/*
*----------------------------------------------------------------------
*
* InitializeHostName --
*
* This routine sets the process global value of the name of the local
* host on which the process is running.
*
* Results:
* None.
*
*----------------------------------------------------------------------
*/
static void
InitializeHostName(
char **valuePtr,
int *lengthPtr,
Tcl_Encoding *encodingPtr)
{
CONST char *native = NULL;
#ifndef NO_UNAME
struct utsname u;
struct hostent *hp;
(void *) memset((void *) &u, (int) 0, sizeof(struct utsname));
if (uname(&u) > -1) { /* INTL: Native. */
hp = gethostbyname(u.nodename); /* INTL: Native. */
if (hp == NULL) {
/*
* Sometimes the nodename is fully qualified, but gets truncated
* as it exceeds SYS_NMLN. See if we can just get the immediate
* nodename and get a proper answer that way.
*/
char *dot = strchr(u.nodename, '.');
if (dot != NULL) {
char *node = ckalloc((unsigned) (dot - u.nodename + 1));
memcpy(node, u.nodename, (size_t) (dot - u.nodename));
node[dot - u.nodename] = '\0';
hp = gethostbyname(node);
ckfree(node);
}
}
if (hp != NULL) {
native = hp->h_name;
} else {
native = u.nodename;
}
}
if (native == NULL) {
native = tclEmptyStringRep;
}
#else
/*
* Uname doesn't exist; try gethostname instead.
*
* There is no portable macro for the maximum length of host names
* returned by gethostbyname(). We should only trust SYS_NMLN if it is at
* least 255 + 1 bytes to comply with DNS host name limits.
*
* Note: SYS_NMLN is a restriction on "uname" not on gethostbyname!
*
* For example HP-UX 10.20 has SYS_NMLN == 9, while gethostbyname() can
* return a fully qualified name from DNS of up to 255 bytes.
*
* Fix suggested by Viktor Dukhovni (viktor@esm.com)
*/
# if defined(SYS_NMLN) && SYS_NMLEN >= 256
char buffer[SYS_NMLEN];
# else
char buffer[256];
# endif
if (gethostname(buffer, sizeof(buffer)) > -1) { /* INTL: Native. */
native = buffer;
}
#endif
*encodingPtr = Tcl_GetEncoding(NULL, NULL);
*lengthPtr = strlen(native);
*valuePtr = ckalloc((unsigned int) (*lengthPtr)+1);
memcpy((void *) *valuePtr, (void *) native, (size_t)(*lengthPtr)+1);
}
/*
*----------------------------------------------------------------------
*
* Tcl_GetHostName --
*
* Returns the name of the local host.
*
* Results:
* A string containing the network name for this machine, or an empty
* string if we can't figure out the name. The caller must not modify or
* free this string.
*
* Side effects:
* Caches the name to return for future calls.
*
*----------------------------------------------------------------------
*/
CONST char *
Tcl_GetHostName(void)
{
return Tcl_GetString(TclGetProcessGlobalValue(&hostName));
}
/*
*----------------------------------------------------------------------
*
* TclpHasSockets --
*
* Detect if sockets are available on this platform.
*
* Results:
* Returns TCL_OK.
*
* Side effects:
* None.
*
*----------------------------------------------------------------------
*/
int
TclpHasSockets(
Tcl_Interp *interp) /* Not used. */
{
return TCL_OK;
}
/*
* Local Variables:
* mode: c
* c-basic-offset: 4
* fill-column: 78
* End:
*/
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