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[pf3gnuchains/pf3gnuchains3x.git] / tcl / unix / tclUnixSock.c

diff --git a/tcl/unix/tclUnixSock.c b/tcl/unix/tclUnixSock.c
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+++ b/tcl/unix/tclUnixSock.c
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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: @(#) $Id$
+ */
+
+#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
+
+
+/*
+ * 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)
+
+\f
+/*
+ *----------------------------------------------------------------------
+ *
+ * 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:
+ *     None.
+ *
+ *----------------------------------------------------------------------
+ */
+
+CONST char *
+Tcl_GetHostName()
+{
+#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));
+    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;
+        }
+    }
+#else
+    /*
+     * Uname doesn't exist; try gethostname instead.
+     */
+
+    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;
+}
+\f
+/*
+ *----------------------------------------------------------------------
+ *
+ * TclpHasSockets --
+ *
+ *     Detect if sockets are available on this platform.
+ *
+ * Results:
+ *     Returns TCL_OK.
+ *
+ * Side effects:
+ *     None.
+ *
+ *----------------------------------------------------------------------
+ */
+
+int
+TclpHasSockets(interp)
+    Tcl_Interp *interp;                /* Not used. */
+{
+    return TCL_OK;
+}