Initial revision

1 files changed, 135 insertions, 0 deletions

diff --git a/unix/tclLoadDl.c b/unix/tclLoadDl.c
new file mode 100644
index 0000000..2619bfd
--- /dev/null
+++ b/unix/tclLoadDl.c
@@ -0,0 +1,135 @@
+/* 
+ * tclLoadDl.c --
+ *
+ *	This procedure provides a version of the TclLoadFile that
+ *	works with the "dlopen" and "dlsym" library procedures for
+ *	dynamic loading.
+ *
+ * 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.
+ *
+ * SCCS: @(#) tclLoadDl.c 1.8 96/12/03 16:57:00
+ */
+
+#include "tclInt.h"
+#ifdef NO_DLFCN_H
+#   include "../compat/dlfcn.h"
+#else
+#   include <dlfcn.h>
+#endif
+
+/*
+ * In some systems, like SunOS 4.1.3, the RTLD_NOW flag isn't defined
+ * and this argument to dlopen must always be 1.  The RTLD_GLOBAL
+ * flag is needed on some systems (e.g. SCO and UnixWare) but doesn't
+ * exist on others;  if it doesn't exist, set it to 0 so it has no effect.
+ */
+
+#ifndef RTLD_NOW
+#   define RTLD_NOW 1
+#endif
+
+#ifndef RTLD_GLOBAL
+#   define RTLD_GLOBAL 0
+#endif
+
+/*
+ *----------------------------------------------------------------------
+ *
+ * TclLoadFile --
+ *
+ *	Dynamically loads a binary code file into memory and returns
+ *	the addresses of two procedures within that file, if they
+ *	are defined.
+ *
+ * Results:
+ *	A standard Tcl completion code.  If an error occurs, an error
+ *	message is left in interp->result.  *proc1Ptr and *proc2Ptr
+ *	are filled in with the addresses of the symbols given by
+ *	*sym1 and *sym2, or NULL if those symbols can't be found.
+ *
+ * Side effects:
+ *	New code suddenly appears in memory.
+ *
+ *----------------------------------------------------------------------
+ */
+
+int
+TclLoadFile(interp, fileName, sym1, sym2, proc1Ptr, proc2Ptr)
+    Tcl_Interp *interp;		/* Used for error reporting. */
+    char *fileName;		/* Name of the file containing the desired
+				 * code. */
+    char *sym1, *sym2;		/* Names of two procedures to look up in
+				 * the file's symbol table. */
+    Tcl_PackageInitProc **proc1Ptr, **proc2Ptr;
+				/* Where to return the addresses corresponding
+				 * to sym1 and sym2. */
+{
+    VOID *handle;
+    Tcl_DString newName;
+
+    handle = dlopen(fileName, RTLD_NOW | RTLD_GLOBAL);
+    if (handle == NULL) {
+	Tcl_AppendResult(interp, "couldn't load file \"", fileName,
+		"\": ", dlerror(), (char *) NULL);
+	return TCL_ERROR;
+    }
+
+    /* 
+     * Some platforms still add an underscore to the beginning of symbol
+     * names.  If we can't find a name without an underscore, try again
+     * with the underscore.
+     */
+
+    *proc1Ptr = (Tcl_PackageInitProc *) dlsym(handle, (char *) sym1);
+    if (*proc1Ptr == NULL) {
+	Tcl_DStringInit(&newName);
+	Tcl_DStringAppend(&newName, "_", 1);
+	Tcl_DStringAppend(&newName, sym1, -1);
+	*proc1Ptr = (Tcl_PackageInitProc *) dlsym(handle,
+		Tcl_DStringValue(&newName));
+	Tcl_DStringFree(&newName);
+    }
+    *proc2Ptr = (Tcl_PackageInitProc *) dlsym(handle, (char *) sym2);
+    if (*proc2Ptr == NULL) {
+	Tcl_DStringInit(&newName);
+	Tcl_DStringAppend(&newName, "_", 1);
+	Tcl_DStringAppend(&newName, sym2, -1);
+	*proc2Ptr = (Tcl_PackageInitProc *) dlsym(handle,
+		Tcl_DStringValue(&newName));
+	Tcl_DStringFree(&newName);
+    }
+    return TCL_OK;
+}
+
+/*
+ *----------------------------------------------------------------------
+ *
+ * TclGuessPackageName --
+ *
+ *	If the "load" command is invoked without providing a package
+ *	name, this procedure is invoked to try to figure it out.
+ *
+ * Results:
+ *	Always returns 0 to indicate that we couldn't figure out a
+ *	package name;  generic code will then try to guess the package
+ *	from the file name.  A return value of 1 would have meant that
+ *	we figured out the package name and put it in bufPtr.
+ *
+ * Side effects:
+ *	None.
+ *
+ *----------------------------------------------------------------------
+ */
+
+int
+TclGuessPackageName(fileName, bufPtr)
+    char *fileName;		/* Name of file containing package (already
+				 * translated to local form if needed). */
+    Tcl_DString *bufPtr;	/* Initialized empty dstring.  Append
+				 * package name to this if possible. */
+{
+    return 0;
+}