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