1 files changed, 100 insertions, 0 deletions
diff --git a/tcl/unix/tclUnixSock.c b/tcl/unix/tclUnixSock.c
new file mode 100644
index 00000000000..7f9597905d9
--- /dev/null
+++ b/tcl/unix/tclUnixSock.c
@@ -0,0 +1,100 @@
+/* 
+ * 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_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.
+ *
+ *----------------------------------------------------------------------
+ */
+
+char *
+Tcl_GetHostName()
+{
+#ifndef NO_UNAME
+    struct utsname u;
+    struct hostent *hp;
+#endif
+
+    if (hostnameInited) {
+        return hostname;
+    }
+
+#ifndef NO_UNAME
+    (VOID *) memset((VOID *) &u, (int) 0, sizeof(struct utsname));
+    if (uname(&u) > -1) {
+        hp = gethostbyname(u.nodename);
+        if (hp != NULL) {
+            strcpy(hostname, hp->h_name);
+        } else {
+            strcpy(hostname, u.nodename);
+        }
+        hostnameInited = 1;
+        return hostname;
+    }
+#else
+    /*
+     * Uname doesn't exist; try gethostname instead.
+     */
+
+    if (gethostname(hostname, sizeof(hostname)) > -1) {
+	hostnameInited = 1;
+        return hostname;
+    }
+#endif
+
+    hostname[0] = 0;
+    return hostname;
+}