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+'\"
+'\" Copyright (c) 1995-1996 Sun Microsystems, Inc.
+'\"
+'\" See the file "license.terms" for information on usage and redistribution
+'\" of this file, and for a DISCLAIMER OF ALL WARRANTIES.
+'\" 
+.\" The -*- nroff -*- definitions below are for supplemental macros used
+.\" in Tcl/Tk manual entries.
+.\"
+.\" .AP type name in/out ?indent?
+.\"	Start paragraph describing an argument to a library procedure.
+.\"	type is type of argument (int, etc.), in/out is either "in", "out",
+.\"	or "in/out" to describe whether procedure reads or modifies arg,
+.\"	and indent is equivalent to second arg of .IP (shouldn't ever be
+.\"	needed;  use .AS below instead)
+.\"
+.\" .AS ?type? ?name?
+.\"	Give maximum sizes of arguments for setting tab stops.  Type and
+.\"	name are examples of largest possible arguments that will be passed
+.\"	to .AP later.  If args are omitted, default tab stops are used.
+.\"
+.\" .BS
+.\"	Start box enclosure.  From here until next .BE, everything will be
+.\"	enclosed in one large box.
+.\"
+.\" .BE
+.\"	End of box enclosure.
+.\"
+.\" .CS
+.\"	Begin code excerpt.
+.\"
+.\" .CE
+.\"	End code excerpt.
+.\"
+.\" .VS ?version? ?br?
+.\"	Begin vertical sidebar, for use in marking newly-changed parts
+.\"	of man pages.  The first argument is ignored and used for recording
+.\"	the version when the .VS was added, so that the sidebars can be
+.\"	found and removed when they reach a certain age.  If another argument
+.\"	is present, then a line break is forced before starting the sidebar.
+.\"
+.\" .VE
+.\"	End of vertical sidebar.
+.\"
+.\" .DS
+.\"	Begin an indented unfilled display.
+.\"
+.\" .DE
+.\"	End of indented unfilled display.
+.\"
+.\" .SO ?manpage?
+.\"	Start of list of standard options for a Tk widget. The manpage
+.\"	argument defines where to look up the standard options; if
+.\"	omitted, defaults to "options". The options follow on successive
+.\"	lines, in three columns separated by tabs.
+.\"
+.\" .SE
+.\"	End of list of standard options for a Tk widget.
+.\"
+.\" .OP cmdName dbName dbClass
+.\"	Start of description of a specific option.  cmdName gives the
+.\"	option's name as specified in the class command, dbName gives
+.\"	the option's name in the option database, and dbClass gives
+.\"	the option's class in the option database.
+.\"
+.\" .UL arg1 arg2
+.\"	Print arg1 underlined, then print arg2 normally.
+.\"
+.\" .QW arg1 ?arg2?
+.\"	Print arg1 in quotes, then arg2 normally (for trailing punctuation).
+.\"
+.\" .PQ arg1 ?arg2?
+.\"	Print an open parenthesis, arg1 in quotes, then arg2 normally
+.\"	(for trailing punctuation) and then a closing parenthesis.
+.\"
+.\"	# Set up traps and other miscellaneous stuff for Tcl/Tk man pages.
+.if t .wh -1.3i ^B
+.nr ^l \n(.l
+.ad b
+.\"	# Start an argument description
+.de AP
+.ie !"\\$4"" .TP \\$4
+.el \{\
+.   ie !"\\$2"" .TP \\n()Cu
+.   el          .TP 15
+.\}
+.ta \\n()Au \\n()Bu
+.ie !"\\$3"" \{\
+\&\\$1 \\fI\\$2\\fP (\\$3)
+.\".b
+.\}
+.el \{\
+.br
+.ie !"\\$2"" \{\
+\&\\$1	\\fI\\$2\\fP
+.\}
+.el \{\
+\&\\fI\\$1\\fP
+.\}
+.\}
+..
+.\"	# define tabbing values for .AP
+.de AS
+.nr )A 10n
+.if !"\\$1"" .nr )A \\w'\\$1'u+3n
+.nr )B \\n()Au+15n
+.\"
+.if !"\\$2"" .nr )B \\w'\\$2'u+\\n()Au+3n
+.nr )C \\n()Bu+\\w'(in/out)'u+2n
+..
+.AS Tcl_Interp Tcl_CreateInterp in/out
+.\"	# BS - start boxed text
+.\"	# ^y = starting y location
+.\"	# ^b = 1
+.de BS
+.br
+.mk ^y
+.nr ^b 1u
+.if n .nf
+.if n .ti 0
+.if n \l'\\n(.lu\(ul'
+.if n .fi
+..
+.\"	# BE - end boxed text (draw box now)
+.de BE
+.nf
+.ti 0
+.mk ^t
+.ie n \l'\\n(^lu\(ul'
+.el \{\
+.\"	Draw four-sided box normally, but don't draw top of
+.\"	box if the box started on an earlier page.
+.ie !\\n(^b-1 \{\
+\h'-1.5n'\L'|\\n(^yu-1v'\l'\\n(^lu+3n\(ul'\L'\\n(^tu+1v-\\n(^yu'\l'|0u-1.5n\(ul'
+.\}
+.el \}\
+\h'-1.5n'\L'|\\n(^yu-1v'\h'\\n(^lu+3n'\L'\\n(^tu+1v-\\n(^yu'\l'|0u-1.5n\(ul'
+.\}
+.\}
+.fi
+.br
+.nr ^b 0
+..
+.\"	# VS - start vertical sidebar
+.\"	# ^Y = starting y location
+.\"	# ^v = 1 (for troff;  for nroff this doesn't matter)
+.de VS
+.if !"\\$2"" .br
+.mk ^Y
+.ie n 'mc \s12\(br\s0
+.el .nr ^v 1u
+..
+.\"	# VE - end of vertical sidebar
+.de VE
+.ie n 'mc
+.el \{\
+.ev 2
+.nf
+.ti 0
+.mk ^t
+\h'|\\n(^lu+3n'\L'|\\n(^Yu-1v\(bv'\v'\\n(^tu+1v-\\n(^Yu'\h'-|\\n(^lu+3n'
+.sp -1
+.fi
+.ev
+.\}
+.nr ^v 0
+..
+.\"	# Special macro to handle page bottom:  finish off current
+.\"	# box/sidebar if in box/sidebar mode, then invoked standard
+.\"	# page bottom macro.
+.de ^B
+.ev 2
+'ti 0
+'nf
+.mk ^t
+.if \\n(^b \{\
+.\"	Draw three-sided box if this is the box's first page,
+.\"	draw two sides but no top otherwise.
+.ie !\\n(^b-1 \h'-1.5n'\L'|\\n(^yu-1v'\l'\\n(^lu+3n\(ul'\L'\\n(^tu+1v-\\n(^yu'\h'|0u'\c
+.el \h'-1.5n'\L'|\\n(^yu-1v'\h'\\n(^lu+3n'\L'\\n(^tu+1v-\\n(^yu'\h'|0u'\c
+.\}
+.if \\n(^v \{\
+.nr ^x \\n(^tu+1v-\\n(^Yu
+\kx\h'-\\nxu'\h'|\\n(^lu+3n'\ky\L'-\\n(^xu'\v'\\n(^xu'\h'|0u'\c
+.\}
+.bp
+'fi
+.ev
+.if \\n(^b \{\
+.mk ^y
+.nr ^b 2
+.\}
+.if \\n(^v \{\
+.mk ^Y
+.\}
+..
+.\"	# DS - begin display
+.de DS
+.RS
+.nf
+.sp
+..
+.\"	# DE - end display
+.de DE
+.fi
+.RE
+.sp
+..
+.\"	# SO - start of list of standard options
+.de SO
+'ie '\\$1'' .ds So \\fBoptions\\fR
+'el .ds So \\fB\\$1\\fR
+.SH "STANDARD OPTIONS"
+.LP
+.nf
+.ta 5.5c 11c
+.ft B
+..
+.\"	# SE - end of list of standard options
+.de SE
+.fi
+.ft R
+.LP
+See the \\*(So manual entry for details on the standard options.
+..
+.\"	# OP - start of full description for a single option
+.de OP
+.LP
+.nf
+.ta 4c
+Command-Line Name:	\\fB\\$1\\fR
+Database Name:	\\fB\\$2\\fR
+Database Class:	\\fB\\$3\\fR
+.fi
+.IP
+..
+.\"	# CS - begin code excerpt
+.de CS
+.RS
+.nf
+.ta .25i .5i .75i 1i
+..
+.\"	# CE - end code excerpt
+.de CE
+.fi
+.RE
+..
+.\"	# UL - underline word
+.de UL
+\\$1\l'|0\(ul'\\$2
+..
+.\"	# QW - apply quotation marks to word
+.de QW
+.ie '\\*(lq'"' ``\\$1''\\$2
+.\"" fix emacs highlighting
+.el \\*(lq\\$1\\*(rq\\$2
+..
+.\"	# PQ - apply parens and quotation marks to word
+.de PQ
+.ie '\\*(lq'"' (``\\$1''\\$2)\\$3
+.\"" fix emacs highlighting
+.el (\\*(lq\\$1\\*(rq\\$2)\\$3
+..
+.\"	# QR - quoted range
+.de QR
+.ie '\\*(lq'"' ``\\$1''\\-``\\$2''\\$3
+.\"" fix emacs highlighting
+.el \\*(lq\\$1\\*(rq\\-\\*(lq\\$2\\*(rq\\$3
+..
+.\"	# MT - "empty" string
+.de MT
+.QW ""
+..
+.TH load n 7.5 Tcl "Tcl Built-In Commands"
+.BS
+'\" Note:  do not modify the .SH NAME line immediately below!
+.SH NAME
+load \- Load machine code and initialize new commands
+.SH SYNOPSIS
+\fBload \fIfileName\fR
+.br
+\fBload \fIfileName packageName\fR
+.br
+\fBload \fIfileName packageName interp\fR
+.BE
+
+.SH DESCRIPTION
+.PP
+This command loads binary code from a file into the
+application's address space and calls an initialization procedure
+in the package to incorporate it into an interpreter.  \fIfileName\fR
+is the name of the file containing the code;  its exact form varies
+from system to system but on most systems it is a shared library,
+such as a \fB.so\fR file under Solaris or a DLL under Windows.
+\fIpackageName\fR is the name of the package, and is used to
+compute the name of an initialization procedure.
+\fIinterp\fR is the path name of the interpreter into which to load
+the package (see the \fBinterp\fR manual entry for details);
+if \fIinterp\fR is omitted, it defaults to the
+interpreter in which the \fBload\fR command was invoked.
+.PP
+Once the file has been loaded into the application's address space,
+one of two initialization procedures will be invoked in the new code.
+Typically the initialization procedure will add new commands to a
+Tcl interpreter.
+The name of the initialization 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_Init\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_Init\fR.
+.PP
+If the target interpreter is a safe interpreter, then the name
+of the initialization procedure will be \fIpkg\fB_SafeInit\fR
+instead of \fIpkg\fB_Init\fR.
+The \fIpkg\fB_SafeInit\fR function should be written carefully, so that it
+initializes the safe interpreter only with partial functionality provided
+by the package that is safe for use by untrusted code. For more information
+on Safe\-Tcl, see the \fBsafe\fR manual entry.
+.PP
+The initialization procedure must match the following prototype:
+.CS
+typedef int Tcl_PackageInitProc(Tcl_Interp *\fIinterp\fR);
+.CE
+The \fIinterp\fR argument identifies the interpreter in which the
+package is to be loaded.  The initialization 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.  The result of the \fBload\fR command
+will be the result returned by the initialization procedure.
+.PP
+The actual loading of a file will only be done once for each \fIfileName\fR
+in an application.  If a given \fIfileName\fR is loaded into multiple
+interpreters, then the first \fBload\fR will load the code and
+call the initialization procedure;  subsequent \fBload\fRs will
+call the initialization procedure without loading the code again.
+.VS 8.5
+For Tcl versions lower than 8.5, it is not possible to unload or reload a
+package. From version 8.5 however, the \fBunload\fR command allows the unloading
+of libraries loaded with \fBload\fR, for libraries that are aware of the
+Tcl's unloading mechanism.
+.VE 8.5
+.PP
+The \fBload\fR command also supports packages that are statically
+linked with the application, if those packages have been registered
+by calling the \fBTcl_StaticPackage\fR procedure.
+If \fIfileName\fR is an empty string, then \fIpackageName\fR 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 \fBload libxyz4.2.so\fR uses the module
+name \fBxyz\fR and the command \fBload bin/last.so {}\fR uses the
+module name \fBlast\fR.
+.PP
+If \fIfileName\fR is an empty string, then \fIpackageName\fR must
+be specified.
+The \fBload\fR command first searches for a statically loaded package
+(one that has been registered by calling the \fBTcl_StaticPackage\fR
+procedure) by that name; if one is found, it is used.
+Otherwise, the \fBload\fR command searches for a dynamically loaded
+package by that name, and uses it if it is found.  If several
+different files have been \fBload\fRed with different versions of
+the package, Tcl picks the file that was loaded first.
+.SH "PORTABILITY ISSUES"
+.TP
+\fBWindows\fR\0\0\0\0\0
+.
+When a load fails with
+.QW "library not found"
+error, it is also possible
+that a dependent library was not found.  To see the dependent libraries,
+type
+.QW "dumpbin -imports <dllname>"
+in a DOS console to see what the library must import.
+When loading a DLL in the current directory, Windows will ignore
+.QW ./
+as a path specifier and use a search heuristic to find the DLL instead.
+To avoid this, load the DLL with:
+.CS
+\fBload\fR [file join [pwd] mylib.DLL]
+.CE
+.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).
+.SH EXAMPLE
+The following is a minimal extension:
+.PP
+.CS
+#include <tcl.h>
+#include <stdio.h>
+static int fooCmd(ClientData clientData,
+        Tcl_Interp *interp, int objc, Tcl_Obj *const objv[]) {
+    printf("called with %d arguments\en", objc);
+    return TCL_OK;
+}
+int Foo_Init(Tcl_Interp *interp) {
+    if (Tcl_InitStubs(interp, "8.1", 0) == NULL) {
+	return TCL_ERROR;
+    }
+    printf("creating foo command");
+    Tcl_CreateObjCommand(interp, "foo", fooCmd, NULL, NULL);
+    return TCL_OK;
+}
+.CE
+.PP
+When built into a shared/dynamic library with a suitable name
+(e.g. \fBfoo.dll\fR on Windows, \fBlibfoo.so\fR on Solaris and Linux)
+it can then be loaded into Tcl with the following:
+.PP
+.CS
+# Load the extension
+switch $tcl_platform(platform) {
+   windows {
+      \fBload\fR [file join [pwd] foo.dll]
+   }
+   unix {
+      \fBload\fR [file join [pwd] libfoo[info sharedlibextension]]
+   }
+}
+
+# Now execute the command defined by the extension
+foo
+.CE
+
+.SH "SEE ALSO"
+info sharedlibextension, Tcl_StaticPackage(3), safe(n)
+
+.SH KEYWORDS
+binary code, loading, safe interpreter, shared library