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load(n)			     Tcl Built-In Commands		       load(n)

______________________________________________________________________________

NAME
       load - Load machine code and initialize new commands.

SYNOPSIS
       load fileName
       load fileName packageName
       load fileName packageName interp
_________________________________________________________________

DESCRIPTION
       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.  fileName 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 .so file under
       Solaris or a DLL under Windows.	packageName is the name of  the	 pack‐
       age,  and  is  used to compute the name of an initialization procedure.
       interp is the path name of the interpreter into which to load the pack‐
       age (see the interp manual entry for details); if interp is omitted, it
       defaults to the interpreter in which the load command was invoked.

       Once the file has been loaded into the application's address space, one
       of two initialization procedures will be invoked in the new code.  Typ‐
       ically the initialization procedure will add  new  commands  to	a  Tcl
       interpreter.  The name of the initialization procedure is determined by
       packageName and whether or not the target interpreter is	 a  safe  one.
       For  normal  interpreters the name of the initialization procedure will
       have the form pkg_Init, where pkg is the	 same  as  packageName	except
       that  the first letter is converted to upper case and all other letters
       are converted to lower case.  For example, if  packageName  is  foo  or
       FOo, the initialization procedure's name will be Foo_Init.

       If  the	target interpreter is a safe interpreter, then the name of the
       initialization procedure will be pkg_SafeInit instead of pkg_Init.  The
       pkg_SafeInit  function should be written carefully, so that it initial‐
       izes the safe interpreter only with partial functionality  provided  by
       the  package  that is safe for use by untrusted code. For more informa‐
       tion on Safe-Tcl, see the safe manual entry.

       The initialization procedure must match the following prototype:
	      typedef int Tcl_PackageInitProc(Tcl_Interp *interp);
       The interp argument identifies the interpreter in which the package  is
       to  be  loaded.	 The  initialization  procedure	 must return TCL_OK or
       TCL_ERROR 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  load	command	 will  be  the	result
       returned by the initialization procedure.

       The  actual  loading of a file will only be done once for each fileName
       in an application.  If a given fileName is loaded into multiple	inter‐
       preters,	 then  the first load will load the code and call the initial‐
       ization procedure;  subsequent loads will call the initialization  pro‐
       cedure without loading the code again.  It is not possible to unload or
       reload a package.

       The load command also supports packages that are statically linked with
       the  application, if those packages have been registered by calling the
       Tcl_StaticPackage procedure.  If fileName  is  an  empty	 string,  then
       packageName must be specified.

       If packageName is omitted or specified as an empty string, Tcl tries to
       guess the name of the package.  This may be done differently on differ‐
       ent  platforms.	 The  default  guess, which is used on most UNIX plat‐
       forms, is to take the last element of fileName,	strip  off  the	 first
       three  characters if they are lib, and use any following alphabetic and │
       underline characters as the module name.	 For example, the command load
       libxyz4.2.so  uses the module name xyz and the command load bin/last.so
       {} uses the module name last.

       If fileName is an empty string, then  packageName  must	be  specified. │
       The  load  command  first searches for a statically loaded package (one │
       that has been registered by calling the Tcl_StaticPackage procedure) by │
       that  name;  if	one is found, it is used.  Otherwise, the load command │
       searches for a dynamically loaded package by that name, and uses it  if │
       it  is found.  If several different files have been loaded with differ‐ │
       ent versions of the package, Tcl picks the file that was loaded first.

PORTABILITY ISSUES
       Windows
	      When a load fails with "library not found"  error,  it  is  also
	      possible	that  a	 dependent  library was not found.  To see the
	      dependent libraries, type ``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	 ``./''	 as  a
	      path  specifier  and  use	 a  search  heuristic  to find the DLL
	      instead.	To avoid this, load the DLL with
		  load [file join [pwd] mylib.DLL]

BUGS
       If the same file is loaded by different fileNames, 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).

SEE ALSO
       info sharedlibextension, Tcl_StaticPackage(3), safe(n)

KEYWORDS
       binary code, loading, safe interpreter, shared library

Tcl				      7.5			       load(n)
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