h2ph(1) - f39

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

6       h2ph - convert .h C header files to .ph Perl header files
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SYNOPSIS

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

13       h2ph converts any C header files specified to the corresponding Perl
14       header file format.  It is most easily run while in /usr/include:
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16               cd /usr/include; h2ph * sys/*
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18       or
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20               cd /usr/include; h2ph * sys/* arpa/* netinet/*
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22       or
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24               cd /usr/include; h2ph -r -l .
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26       The output files are placed in the hierarchy rooted at Perl's
27       architecture dependent library directory.  You can specify a different
28       hierarchy with a -d switch.
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30       If run with no arguments, filters standard input to standard output.
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OPTIONS

33       -d destination_dir
34           Put the resulting .ph files beneath destination_dir, instead of
35           beneath the default Perl library location
36           ($Config{'installsitearch'}).
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38       -r  Run recursively; if any of headerfiles are directories, then run
39           h2ph on all files in those directories (and their subdirectories,
40           etc.).  -r and -a are mutually exclusive.
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42       -a  Run automagically; convert headerfiles, as well as any .h files
43           which they include.  This option will search for .h files in all
44           directories which your C compiler ordinarily uses.  -a and -r are
45           mutually exclusive.
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47       -l  Symbolic links will be replicated in the destination directory.  If
48           -l is not specified, then links are skipped over.
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50       -h  Put 'hints' in the .ph files which will help in locating problems
51           with h2ph.  In those cases when you require a .ph file containing
52           syntax errors, instead of the cryptic
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54                   [ some error condition ] at (eval mmm) line nnn
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56           you will see the slightly more helpful
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58                   [ some error condition ] at filename.ph line nnn
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60           However, the .ph files almost double in size when built using -h.
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62       -e  If an error is encountered during conversion, output file will be
63           removed and a warning emitted instead of terminating the conversion
64           immediately.
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66       -D  Include the code from the .h file as a comment in the .ph file.
67           This is primarily used for debugging h2ph.
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69       -Q  'Quiet' mode; don't print out the names of the files being
70           converted.
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ENVIRONMENT

73       No environment variables are used.
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FILES

76        /usr/include/*.h
77        /usr/include/sys/*.h
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79       etc.
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AUTHOR

82       Larry Wall
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DIAGNOSTICS

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

91       Doesn't construct the %sizeof array for you.
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93       It doesn't handle all C constructs, but it does attempt to isolate
94       definitions inside evals so that you can get at the definitions that it
95       can translate.
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97       It's only intended as a rough tool.  You may need to dicker with the
98       files produced.
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100       You have to run this program by hand; it's not run as part of the Perl
101       installation.
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103       Doesn't handle complicated expressions built piecemeal, a la:
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105           enum {
106               FIRST_VALUE,
107               SECOND_VALUE,
108           #ifdef ABC
109               THIRD_VALUE
110           #endif
111           };
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113       Doesn't necessarily locate all of your C compiler's internally-defined
114       symbols.
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118perl v5.38.2                      2023-11-30                           H2PH(1)