tclUnixSock.c Go to the documentation of this file. /* * 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 1.20 2007/12/13 15:28:42 dgp 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; memset(&u, (int) 0, sizeof(struct utsname)); if (uname(&u) > -1) { /* INTL: Native. */ hp = TclpGetHostByName(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 = TclpGetHostByName(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(*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; }  /* *---------------------------------------------------------------------- * * TclpFinalizeSockets -- * * Performs per-thread socket subsystem finalization. * * Results: * None. * * Side effects: * None. * *---------------------------------------------------------------------- */ void TclpFinalizeSockets(void) { return; }  /* * Local Variables: * mode: c * c-basic-offset: 4 * fill-column: 78 * End: */

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