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H2PH(1)		       Perl Programmers	Reference Guide		       H2PH(1)

NAME
       h2ph - convert .h C header files	to .ph Perl header files

SYNOPSIS
       h2ph [-d	destination directory] [-r | -a] [-l] [-h] [-e]	[-D] [-Q]
       [headerfiles]

DESCRIPTION
       h2ph converts any C header files	specified to the corresponding Perl
       header file format.  It is most easily run while	in /usr/include:

	       cd /usr/include;	h2ph * sys/*

       or

	       cd /usr/include;	h2ph * sys/* arpa/* netinet/*

       or

	       cd /usr/include;	h2ph -r	-l .

       The output files	are placed in the hierarchy rooted at Perl's
       architecture dependent library directory.  You can specify a different
       hierarchy with a	-d switch.

       If run with no arguments, filters standard input	to standard output.

OPTIONS
       -d destination_dir
	   Put the resulting .ph files beneath destination_dir,	instead	of
	   beneath the default Perl library location
	   ($Config{'installsitearch'}).

       -r  Run recursively; if any of headerfiles are directories, then	run
	   h2ph	on all files in	those directories (and their subdirectories,
	   etc.).  -r and -a are mutually exclusive.

       -a  Run automagically; convert headerfiles, as well as any .h files
	   which they include.	This option will search	for .h files in	all
	   directories which your C compiler ordinarily	uses.  -a and -r are
	   mutually exclusive.

       -l  Symbolic links will be replicated in	the destination	directory.  If
	   -l is not specified,	then links are skipped over.

       -h  Put 'hints' in the .ph files	which will help	in locating problems
	   with	h2ph.  In those	cases when you require a .ph file containing
	   syntax errors, instead of the cryptic

		   [ some error	condition ] at (eval mmm) line nnn

	   you will see	the slightly more helpful

		   [ some error	condition ] at filename.ph line	nnn

	   However, the	.ph files almost double	in size	when built using -h.

       -e  If an error is encountered during conversion, output	file will be
	   removed and a warning emitted instead of terminating	the conversion
	   immediately.

       -D  Include the code from the .h	file as	a comment in the .ph file.
	   This	is primarily used for debugging	h2ph.

       -Q  'Quiet' mode; don't print out the names of the files	being
	   converted.

ENVIRONMENT
       No environment variables	are used.

FILES
	/usr/include/*.h
	/usr/include/sys/*.h

       etc.

AUTHOR
       Larry Wall

SEE ALSO
       perl(1)

DIAGNOSTICS
       The usual warnings if it	can't read or write the	files involved.

BUGS
       Doesn't construct the %sizeof array for you.

       It doesn't handle all C constructs, but it does attempt to isolate
       definitions inside evals	so that	you can	get at the definitions that it
       can translate.

       It's only intended as a rough tool.  You	may need to dicker with	the
       files produced.

       You have	to run this program by hand; it's not run as part of the Perl
       installation.

       Doesn't handle complicated expressions built piecemeal, a la:

	   enum	{
	       FIRST_VALUE,
	       SECOND_VALUE,
	   #ifdef ABC
	       THIRD_VALUE
	   #endif
	   };

       Doesn't necessarily locate all of your C	compiler's internally-defined
       symbols.

perl v5.26.0			  2017-07-03			       H2PH(1)

NAME | SYNOPSIS | DESCRIPTION | OPTIONS | ENVIRONMENT | FILES | AUTHOR | SEE ALSO | DIAGNOSTICS | BUGS

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