'\" '\" Copyright (c) 1996 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: PkgRequire.3,v 1.2 2001/09/14 01:42:14 zlaski Exp $ '\" .so man.macros .TH Tcl_PkgRequire 3 7.5 Tcl "Tcl Library Procedures" .BS .SH NAME Tcl_PkgRequire, Tcl_PkgProvide \- package version control .SH SYNOPSIS .nf \fB#include <tcl.h>\fR .sp char * \fBTcl_PkgRequire\fR(\fIinterp, name, version, exact\fR) .sp int \fBTcl_PkgProvide\fR(\fIinterp, name, version\fR) .SH ARGUMENTS .AS Tcl_FreeProc clientData .AP Tcl_Interp *interp in Interpreter where package is needed or available. .AP char *name in Name of package. .AP char *version in A version string consisting of one or more decimal numbers separated by dots. .AP int exact in Non-zero means that only the particular version specified by \fIversion\fR is acceptable. Zero means that newer versions than \fIversion\fR are also acceptable as long as they have the same major version number as \fIversion\fR. .BE .SH DESCRIPTION .PP These procedures provide C-level interfaces to Tcl's package and version management facilities. \fBTcl_PkgRequire\fR is equivalent to the \fBpackage require\fR command, and \fBTcl_PkgProvide\fR is equivalent to the \fBpackage provide\fR command. See the documentation for the Tcl commands for details on what these procedures do. If \fBTcl_PkgRequire\fR completes successfully it returns a pointer to the version string for the version of the package that is provided in the interpreter (which may be different than \fIversion\fR); if an error occurs it returns NULL and leaves an error message in \fIinterp->result\fR. \fBTcl_PkgProvide\fR returns TCL_OK if it completes successfully; if an error occurs it returns TCL_ERROR and leaves an error message in \fIinterp->result\fR. .SH KEYWORDS package, provide, require, version