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authorrjohnson <rjohnson>1998-03-26 14:56:55 (GMT)
committerrjohnson <rjohnson>1998-03-26 14:56:55 (GMT)
commit72d823b9193f9ee2b0318563b49363cd08c11f24 (patch)
treec168cc164a71f320db9dcdfe7518ba7bd0d2c8d9 /unix/tclLoadDl.c
parent2b5738da524e944cda39e24c0a87b745a43bd8c3 (diff)
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+/*
+ * 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;
+}