scripts/headers_install.pl

   1 #!/usr/bin/perl
   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
  19 use strict;
  20 use warnings;
  21
  22 my ($readdir, $installdir, $arch, @files) = @ARGV;
  23
  24 my $unifdef = "scripts/unifdef -U__KERNEL__";
  25
  26 foreach my $file (@files) {
  27         my $tmpfile = "$installdir/$file.tmp";
  28         open(my $infile, '<', "$readdir/$file")
  29                 or die "$readdir/$file: $!\n";
  30         open(my $outfile, '>', "$tmpfile") or die "$tmpfile: $!\n";
  31         while (my $line = <$infile>) {
  32                 $line =~ s/([\s(])__user\s/$1/g;
  33                 $line =~ s/([\s(])__force\s/$1/g;
  34                 $line =~ s/([\s(])__iomem\s/$1/g;
  35                 $line =~ s/\s__attribute_const__\s/ /g;
  36                 $line =~ s/\s__attribute_const__$//g;
  37                 $line =~ s/^#include <linux\/compiler.h>//;
  38                 printf $outfile "%s", $line;
  39         }
  40         close $outfile;
  41         close $infile;
  42         system $unifdef . " $tmpfile > $installdir/$file";
  43         unlink $tmpfile;
  44 }
  45 exit 0;