h2ph [-d destination directory] [-r | -a] [-l] [headerfiles]
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/*
cd /usr/include; h2ph * sys/* arpa/* netinet/*
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.
Put the resulting .ph files beneath destination_dir, instead of
beneath the default Perl library location
-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
-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.
The usual warnings if it can't read or write the files involved.
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
It's only intended as a rough tool. You may need to dicker with the
You have to run this program by hand; it's not run as part of the Perl
Doesn't handle complicated expressions built piecemeal, a la:
Doesn't necessarily locate all of your C compiler's internally-defined
perl v5.18.2 2018-06-13 H2PH(1)
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