diff options
Diffstat (limited to 'unix/tclUnixSock.c')
| -rw-r--r-- | unix/tclUnixSock.c | 147 |
1 files changed, 82 insertions, 65 deletions
diff --git a/unix/tclUnixSock.c b/unix/tclUnixSock.c index cb3cc36..a2b4015 100644 --- a/unix/tclUnixSock.c +++ b/unix/tclUnixSock.c @@ -1,96 +1,66 @@ -/* +/* * 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. + * See the file "license.terms" for information on usage and redistribution of + * this file, and for a DISCLAIMER OF ALL WARRANTIES. */ -#include "tcl.h" -#include "tclPort.h" - -/* - * 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 -#define TCL_HOSTNAME_LEN SYS_NMLEN -#else -#define TCL_HOSTNAME_LEN 256 -#endif - +#include "tclInt.h" /* * The following variable holds the network name of this host. */ -static char hostname[TCL_HOSTNAME_LEN + 1]; -static int hostnameInited = 0; -TCL_DECLARE_MUTEX(hostMutex) +static TclInitProcessGlobalValueProc InitializeHostName; +static ProcessGlobalValue hostName = + {0, 0, NULL, NULL, InitializeHostName, NULL, NULL}; /* *---------------------------------------------------------------------- * - * Tcl_GetHostName -- + * InitializeHostName -- * - * Returns the name of the local host. + * This routine sets the process global value of the name of the local + * host on which the process is running. * * 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: * None. * *---------------------------------------------------------------------- */ -CONST char * -Tcl_GetHostName() +static void +InitializeHostName( + char **valuePtr, + int *lengthPtr, + Tcl_Encoding *encodingPtr) { + CONST char *native = NULL; + #ifndef NO_UNAME struct utsname u; struct hostent *hp; -#else - char buffer[sizeof(hostname)]; -#endif - CONST char *native; - Tcl_MutexLock(&hostMutex); - if (hostnameInited) { - Tcl_MutexUnlock(&hostMutex); - return hostname; - } - - native = NULL; -#ifndef NO_UNAME - (VOID *) memset((VOID *) &u, (int) 0, sizeof(struct utsname)); + memset(&u, (int) 0, sizeof(struct utsname)); if (uname(&u) > -1) { /* INTL: Native. */ - hp = TclpGetHostByName(u.nodename); /* 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 + * 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); @@ -103,25 +73,64 @@ Tcl_GetHostName() 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 - if (native == NULL) { - hostname[0] = 0; - } else { - Tcl_ExternalToUtf(NULL, NULL, native, -1, 0, NULL, hostname, - sizeof(hostname), NULL, NULL, NULL); - } - hostnameInited = 1; - Tcl_MutexUnlock(&hostMutex); - return hostname; + *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)); } /* @@ -141,8 +150,8 @@ Tcl_GetHostName() */ int -TclpHasSockets(interp) - Tcl_Interp *interp; /* Not used. */ +TclpHasSockets( + Tcl_Interp *interp) /* Not used. */ { return TCL_OK; } @@ -164,7 +173,15 @@ TclpHasSockets(interp) */ void -TclpFinalizeSockets() +TclpFinalizeSockets(void) { return; } + +/* + * Local Variables: + * mode: c + * c-basic-offset: 4 + * fill-column: 78 + * End: + */ |