linux/scripts/headers_install.pl
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   1#!/usr/bin/perl -w
   2#
   3# headers_install prepare the listed header files for use in
   4# user space and copy the files to their destination.
   5#
   6# Usage: headers_install.pl readdir installdir arch [files...]
   7# installdir: dir to install the files to
   8# arch:       current architecture
   9#             arch is used to force a reinstallation when the arch
  10#             changes because kbuild then detect a command line change.
  11# files:      list of files to check
  12#
  13# Step in preparation for users space:
  14# 1) Drop all use of compiler.h definitions
  15# 2) Drop include of compiler.h
  16# 3) Drop all sections defined out by __KERNEL__ (using unifdef)
  17
  18use strict;
  19
  20my ($installdir, $arch, @files) = @ARGV;
  21
  22my $unifdef = "scripts/unifdef -U__KERNEL__ -D__EXPORTED_HEADERS__";
  23
  24foreach my $filename (@files) {
  25        my $file = $filename;
  26        $file =~ s!^.*/!!;
  27
  28        my $tmpfile = "$installdir/$file.tmp";
  29
  30        open(my $in, '<', $filename)
  31            or die "$filename: $!\n";
  32        open(my $out, '>', $tmpfile)
  33            or die "$tmpfile: $!\n";
  34        while (my $line = <$in>) {
  35                $line =~ s/([\s(])__user\s/$1/g;
  36                $line =~ s/([\s(])__force\s/$1/g;
  37                $line =~ s/([\s(])__iomem\s/$1/g;
  38                $line =~ s/\s__attribute_const__\s/ /g;
  39                $line =~ s/\s__attribute_const__$//g;
  40                $line =~ s/\b__packed\b/__attribute__((packed))/g;
  41                $line =~ s/^#include <linux\/compiler.h>//;
  42                $line =~ s/(^|\s)(inline)\b/$1__$2__/g;
  43                $line =~ s/(^|\s)(asm)\b(\s|[(]|$)/$1__$2__$3/g;
  44                $line =~ s/(^|\s|[(])(volatile)\b(\s|[(]|$)/$1__$2__$3/g;
  45                $line =~ s/#ifndef\s+_UAPI/#ifndef /;
  46                $line =~ s/#define\s+_UAPI/#define /;
  47                $line =~ s!#endif\s+/[*]\s*_UAPI!#endif /* !;
  48                printf {$out} "%s", $line;
  49        }
  50        close $out;
  51        close $in;
  52
  53        system $unifdef . " $tmpfile > $installdir/$file";
  54        # unifdef will exit 0 on success, and will exit 1 when the
  55        # file was processed successfully but no changes were made,
  56        # so abort only when it's higher than that.
  57        my $e = $? >> 8;
  58        if ($e > 1) {
  59                die "$tmpfile: $!\n";
  60        }
  61        unlink $tmpfile;
  62}
  63exit 0;
  64
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