1 files changed, 271 insertions, 0 deletions
diff --git a/unix/tclLoadDl.c b/unix/tclLoadDl.c
new file mode 100644
index 0000000..dc711f8
--- /dev/null
+++ b/unix/tclLoadDl.c
@@ -0,0 +1,271 @@
+/*
+ * tclLoadDl.c --
+ *
+ *	This procedure provides a version of the TclLoadFile that works with
+ *	the "dlopen" and "dlsym" library procedures for dynamic loading.
+ *
+ * Copyright (c) 1995-1997 Sun Microsystems, Inc.
+ *
+ * See the file "license.terms" for information on usage and redistribution
+ * of this file, and for a DISCLAIMER OF ALL WARRANTIES.
+ */
+
+#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_LOCAL flag doesn't exist on
+ * some platforms; if it doesn't exist, set it to 0 so it has no effect.
+ * See [Bug #3216070]
+ */
+
+#ifndef RTLD_NOW
+#   define RTLD_NOW 1
+#endif
+
+#ifndef RTLD_LOCAL
+#   define RTLD_LOCAL 0
+#endif
+
+/*
+ * Static procedures defined within this file.
+ */
+
+static void *		FindSymbol(Tcl_Interp *interp,
+			    Tcl_LoadHandle loadHandle, const char *symbol);
+static void		UnloadFile(Tcl_LoadHandle loadHandle);
+
+/*
+ *---------------------------------------------------------------------------
+ *
+ * TclpDlopen --
+ *
+ *	Dynamically loads a binary code file into memory and returns a handle
+ *	to the new code.
+ *
+ * Results:
+ *	A standard Tcl completion code. If an error occurs, an error message
+ *	is left in the interp's result.
+ *
+ * Side effects:
+ *	New code suddenly appears in memory.
+ *
+ *---------------------------------------------------------------------------
+ */
+
+int
+TclpDlopen(
+    Tcl_Interp *interp,		/* Used for error reporting. */
+    Tcl_Obj *pathPtr,		/* Name of the file containing the desired
+				 * code (UTF-8). */
+    Tcl_LoadHandle *loadHandle,	/* Filled with token for dynamically loaded
+				 * file which will be passed back to
+				 * (*unloadProcPtr)() to unload the file. */
+    Tcl_FSUnloadFileProc **unloadProcPtr,
+				/* Filled with address of Tcl_FSUnloadFileProc
+				 * function which should be used for this
+				 * file. */
+    int flags)
+{
+    void *handle;
+    Tcl_LoadHandle newHandle;
+    const char *native;
+    int dlopenflags = 0;
+
+    /*
+     * First try the full path the user gave us. This is particularly
+     * important if the cwd is inside a vfs, and we are trying to load using a
+     * relative path.
+     */
+
+    native = Tcl_FSGetNativePath(pathPtr);
+    /*
+     * Use (RTLD_NOW|RTLD_LOCAL) as default, see [Bug #3216070]
+     */
+    if (flags & TCL_LOAD_GLOBAL) {
+    	dlopenflags |= RTLD_GLOBAL;
+    } else {
+    	dlopenflags |= RTLD_LOCAL;
+    }
+    if (flags & TCL_LOAD_LAZY) {
+    	dlopenflags |= RTLD_LAZY;
+    } else {
+    	dlopenflags |= RTLD_NOW;
+    }
+    handle = dlopen(native, dlopenflags);
+    if (handle == NULL) {
+	/*
+	 * Let the OS loader examine the binary search path for whatever
+	 * string the user gave us which hopefully refers to a file on the
+	 * binary path.
+	 */
+
+	Tcl_DString ds;
+	const char *fileName = Tcl_GetString(pathPtr);
+
+	native = Tcl_UtfToExternalDString(NULL, fileName, -1, &ds);
+	/*
+	 * Use (RTLD_NOW|RTLD_LOCAL) as default, see [Bug #3216070]
+	 */
+	handle = dlopen(native, dlopenflags);
+	Tcl_DStringFree(&ds);
+    }
+
+    if (handle == NULL) {
+	/*
+	 * Write the string to a variable first to work around a compiler bug
+	 * in the Sun Forte 6 compiler. [Bug 1503729]
+	 */
+
+	const char *errorStr = dlerror();
+
+	Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+		"couldn't load file \"%s\": %s",
+		Tcl_GetString(pathPtr), errorStr));
+	return TCL_ERROR;
+    }
+    newHandle = ckalloc(sizeof(*newHandle));
+    newHandle->clientData = handle;
+    newHandle->findSymbolProcPtr = &FindSymbol;
+    newHandle->unloadFileProcPtr = &UnloadFile;
+    *unloadProcPtr = &UnloadFile;
+    *loadHandle = newHandle;
+
+    return TCL_OK;
+}
+
+/*
+ *----------------------------------------------------------------------
+ *
+ * FindSymbol --
+ *
+ *	Looks up a symbol, by name, through a handle associated with a
+ *	previously loaded piece of code (shared library).
+ *
+ * Results:
+ *	Returns a pointer to the function associated with 'symbol' if it is
+ *	found. Otherwise returns NULL and may leave an error message in the
+ *	interp's result.
+ *
+ *----------------------------------------------------------------------
+ */
+
+static void *
+FindSymbol(
+    Tcl_Interp *interp,		/* Place to put error messages. */
+    Tcl_LoadHandle loadHandle,	/* Value from TcpDlopen(). */
+    const char *symbol)		/* Symbol to look up. */
+{
+    const char *native;		/* Name of the library to be loaded, in
+				 * system encoding */
+    Tcl_DString newName, ds;	/* Buffers for converting the name to
+				 * system encoding and prepending an
+				 * underscore*/
+    void *handle = (void *) loadHandle->clientData;
+				/* Native handle to the loaded library */
+    void *proc;			/* Address corresponding to the resolved
+				 * symbol */
+
+    /*
+     * 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.
+     */
+
+    native = Tcl_UtfToExternalDString(NULL, symbol, -1, &ds);
+    proc = dlsym(handle, native);	/* INTL: Native. */
+    if (proc == NULL) {
+	Tcl_DStringInit(&newName);
+	TclDStringAppendLiteral(&newName, "_");
+	native = Tcl_DStringAppend(&newName, native, -1);
+	proc = dlsym(handle, native);	/* INTL: Native. */
+	Tcl_DStringFree(&newName);
+    }
+    Tcl_DStringFree(&ds);
+    if (proc == NULL && interp != NULL) {
+	const char *errorStr = dlerror();
+
+	if (!errorStr) {
+	    errorStr = "unknown";
+	}
+
+	Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+		"cannot find symbol \"%s\": %s", symbol, errorStr));
+	Tcl_SetErrorCode(interp, "TCL", "LOOKUP", "LOAD_SYMBOL", symbol,
+		NULL);
+    }
+    return proc;
+}
+
+/*
+ *----------------------------------------------------------------------
+ *
+ * UnloadFile --
+ *
+ *	Unloads a dynamically loaded binary code file from memory. Code
+ *	pointers in the formerly loaded file are no longer valid after calling
+ *	this function.
+ *
+ * Results:
+ *	None.
+ *
+ * Side effects:
+ *	Code removed from memory.
+ *
+ *----------------------------------------------------------------------
+ */
+
+static void
+UnloadFile(
+    Tcl_LoadHandle loadHandle)	/* loadHandle returned by a previous call to
+				 * TclpDlopen(). The loadHandle is a token
+				 * that represents the loaded file. */
+{
+    void *handle = loadHandle->clientData;
+
+    dlclose(handle);
+    ckfree(loadHandle);
+}
+
+/*
+ *----------------------------------------------------------------------
+ *
+ * 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(
+    const 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;
+}
+
+/*
+ * Local Variables:
+ * mode: c
+ * c-basic-offset: 4
+ * fill-column: 78
+ * End:
+ */