54 lines
2.1 KiB
Plaintext
54 lines
2.1 KiB
Plaintext
Perl 5 DynaLoader
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See DynaLoader.pm for detailed specification.
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This module is very similar to the other Perl 5 modules except that
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Configure selects which dl_*.xs file to use.
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After Configure has been run the Makefile.PL will generate a Makefile
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which will run xsubpp on a specific dl_*.xs file and write the output
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to DynaLoader.c
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After that the processing is the same as any other module.
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Note that, to be effective, the DynaLoader module must be _statically_
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linked into perl! Configure should arrange this.
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This interface is based on the work and comments of (in no particular
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order): Larry Wall, Robert Sanders, Dean Roehrich, Jeff Okamoto, Anno
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Siegel, Thomas Neumann, Paul Marquess, Charles Bailey and others.
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The dl_*.xs files should either be named after the dynamic linking
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operating system interface used if that interface is available on more
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than one type of system, e.g.:
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dlopen for dlopen()/dlsym() type functions (SunOS, BSD)
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dld for the GNU dld library functions (linux, ?)
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or else the osname, e.g., hpux, next, vms etc.
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Both are determined by Configure and so only those specific names that
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Configure knows/uses will work.
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If porting the DynaLoader to a platform that has a core dynamic linking
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interface similar to an existing generic type, e.g., dlopen or dld,
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please try to port the corresponding dl_*.xs file (using #ifdef's if
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required).
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Otherwise, or if that proves too messy, create a new dl_*.xs file named
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after your osname. Configure will give preference to a dl_$osname.xs
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file if one exists.
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The file dl_dlopen.xs is a reference implementation by Paul Marquess
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which is a good place to start if porting from scratch. For more complex
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platforms take a look at dl_dld.xs. The dlutils.c file holds some
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common definitions that are #included into the dl_*.xs files.
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After the initial implementation of a new DynaLoader dl_*.xs file you
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may need to edit or create ext/MODULE/MODULE.bs files (library bootstrap
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files) to reflect the needs of your platform and linking software.
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Refer to DynaLoader.pm, lib/ExtUtils/MakeMaker.pm and any existing
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ext/MODULE/MODULE.bs files for more information.
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Tim Bunce.
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August 1994
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