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-'\"
-'\" Copyright (c) 2003 George Petasis <petasis@iit.demokritos.gr>.
-'\"
-'\" See the file "license.terms" for information on usage and redistribution
-'\" of this file, and for a DISCLAIMER OF ALL WARRANTIES.
-'\"
-.TH unload n 8.5 Tcl "Tcl Built-In Commands"
-.so man.macros
-.BS
-'\" Note:  do not modify the .SH NAME line immediately below!
-.SH NAME
-unload \- Unload machine code
-.SH SYNOPSIS
-\fBunload \fR?\fIswitches\fR? \fIfileName\fR
-.br
-\fBunload \fR?\fIswitches\fR? \fIfileName packageName\fR
-.br
-\fBunload \fR?\fIswitches\fR? \fIfileName packageName interp\fR
-.BE
-.SH DESCRIPTION
-.PP
-This command tries to unload shared libraries previously loaded
-with \fBload\fR from the application's address space.  \fIfileName\fR
-is the name of the file containing the library file to be unload;  it
-must be the same as the filename provided to \fBload\fR for
-loading the library.
-The \fIpackageName\fR argument is the name of the package (as
-determined by or passed to \fBload\fR), and is used to
-compute the name of the unload procedure; if not supplied, it is
-computed from \fIfileName\fR in the same manner as \fBload\fR.
-The \fIinterp\fR argument is the path name of the interpreter from
-which to unload the package (see the \fBinterp\fR manual entry for
-details); if \fIinterp\fR is omitted, it defaults to the
-interpreter in which the \fBunload\fR command was invoked.
-.PP
-If the initial arguments to \fBunload\fR start with \fB\-\fR then
-they are treated as switches.  The following switches are
-currently supported:
-.TP
-\fB\-nocomplain\fR
-.
-Suppresses all error messages. If this switch is given, \fBunload\fR will
-never report an error.
-.TP
-\fB\-keeplibrary\fR
-.
-This switch will prevent \fBunload\fR from issuing the operating system call
-that will unload the library from the process.
-.TP
-\fB\-\|\-\fR
-.
-Marks the end of switches.  The argument following this one will
-be treated as a \fIfileName\fR even if it starts with a \fB\-\fR.
-.SS "UNLOAD OPERATION"
-.PP
-When a file containing a shared library is loaded through the
-\fBload\fR command, Tcl associates two reference counts to the library
-file. The first counter shows how many times the library has been
-loaded into normal (trusted) interpreters while the second describes how many
-times the library has been loaded into safe interpreters. As a file containing
-a shared library can be loaded only once by Tcl (with the first \fBload\fR
-call on the file), these counters track how many interpreters use the library.
-Each subsequent call to \fBload\fR after the first simply increments the
-proper reference count.
-.PP
-\fBunload\fR works in the opposite direction. As a first step, \fBunload\fR
-will check whether the library is unloadable: an unloadable library exports
-a special unload procedure. The name of the unload procedure is determined by
-\fIpackageName\fR and whether or not the target interpreter
-is a safe one.  For normal interpreters the name of the initialization
-procedure will have the form \fIpkg\fB_Unload\fR, where \fIpkg\fR
-is the same as \fIpackageName\fR except that the first letter is
-converted to upper case and all other letters
-are converted to lower case.  For example, if \fIpackageName\fR is
-\fBfoo\fR or \fBFOo\fR, the initialization procedure's name will
-be \fBFoo_Unload\fR.
-If the target interpreter is a safe interpreter, then the name
-of the initialization procedure will be \fIpkg\fB_SafeUnload\fR
-instead of \fIpkg\fB_Unload\fR.
-.PP
-If \fBunload\fR determines that a library is not unloadable (or unload
-functionality has been disabled during compilation), an error will be returned.
-If the library is unloadable, then \fBunload\fR will call the unload
-procedure. If the unload procedure returns \fBTCL_OK\fR, \fBunload\fR will proceed
-and decrease the proper reference count (depending on the target interpreter
-type). When both reference counts have reached 0, the library will be
-detached from the process.
-.SS "UNLOAD HOOK PROTOTYPE"
-.PP
-The unload procedure must match the following prototype:
-.PP
-.CS
-typedef int \fBTcl_PackageUnloadProc\fR(
-        Tcl_Interp *\fIinterp\fR,
-        int \fIflags\fR);
-.CE
-.PP
-The \fIinterp\fR argument identifies the interpreter from which the
-library is to be unloaded.  The unload procedure must return
-\fBTCL_OK\fR or \fBTCL_ERROR\fR to indicate whether or not it completed
-successfully;  in the event of an error it should set the interpreter's result
-to point to an error message.  In this case, the result of the
-\fBunload\fR command will be the result returned by the unload procedure.
-.PP
-The \fIflags\fR argument can be either \fBTCL_UNLOAD_DETACH_FROM_INTERPRETER\fR
-or \fBTCL_UNLOAD_DETACH_FROM_PROCESS\fR. In case the library will remain
-attached to the process after the unload procedure returns (i.e. because
-the library is used by other interpreters),
-\fBTCL_UNLOAD_DETACH_FROM_INTERPRETER\fR will be defined. However, if the
-library is used only by the target interpreter and the library will be
-detached from the application as soon as the unload procedure returns,
-the \fIflags\fR argument will be set to \fBTCL_UNLOAD_DETACH_FROM_PROCESS\fR.
-.SS NOTES
-.PP
-The \fBunload\fR command cannot unload libraries that are statically
-linked with the application.
-If \fIfileName\fR is an empty string, then the \fIpackageName\fR argument must
-be specified.
-.PP
-If \fIpackageName\fR is omitted or specified as an empty string,
-Tcl tries to guess the name of the package.
-This may be done differently on different platforms.
-The default guess, which is used on most UNIX platforms, is to
-take the last element of \fIfileName\fR, strip off the first
-three characters if they are \fBlib\fR, and use any following
-alphabetic and underline characters as the module name.
-For example, the command \fBunload libxyz4.2.so\fR uses the module
-name \fBxyz\fR and the command \fBunload bin/last.so {}\fR uses the
-module name \fBlast\fR.
-.SH "PORTABILITY ISSUES"
-.TP
-\fBUnix\fR\0\0\0\0\0
-.
-Not all unix operating systems support library unloading. Under such
-an operating system \fBunload\fR returns an error (unless \fB\-nocomplain\fR
-has been specified).
-.SH BUGS
-.PP
-If the same file is \fBload\fRed by different \fIfileName\fRs, it will
-be loaded into the process's address space multiple times.  The
-behavior of this varies from system to system (some systems may
-detect the redundant loads, others may not). In case a library has been
-silently detached by the operating system (and as a result Tcl thinks the
-library is still loaded), it may be dangerous to use
-\fBunload\fR on such a library (as the library will be completely detached
-from the application while some interpreters will continue to use it).
-.SH EXAMPLE
-.PP
-If an unloadable module in the file \fBfoobar.dll\fR had been loaded
-using the \fBload\fR command like this (on Windows):
-.PP
-.CS
-load c:/some/dir/foobar.dll
-.CE
-.PP
-then it would be unloaded like this:
-.PP
-.CS
-\fBunload\fR c:/some/dir/foobar.dll
-.CE
-.PP
-This allows a C code module to be installed temporarily into a
-long-running Tcl program and then removed again (either because it is
-no longer needed or because it is being updated with a new version)
-without having to shut down the overall Tcl process.
-.SH "SEE ALSO"
-info sharedlibextension, load(n), safe(n)
-.SH KEYWORDS
-binary code, unloading, safe interpreter, shared library
-.\" Local Variables:
-.\" mode: nroff
-.\" End: