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] [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.

       -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 v5.18.2							    2018-08-17								   H2PH(1)