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Full Discussion: absolute path
Top Forums Programming absolute path Post 302120316 by jim mcnamara on Tuesday 5th of June 2007 04:58:03 PM
Old 06-05-2007
You do realize there can be more than one hard link for a given file, plus there may be multiple symlinks as well. When you call fopen ("/path/to/foo", "r"), foo can easily be a link. So you may not have the real path to start with.

So going "up" the file tree is not going to give you a perfect answer all the time.

I'm not giving you a hard time, it's just that working out whre a file is in all the filesystems on one box is a daunting task. find / -name <> -inode <> is about as good as it gets, even if it is really slow.

In your example, if you're postive foldera or folderb or folderc are under /root then your task is:

get st_dev and st_ino for the file you do have
with popen(), "find /root -name afile -inode st_ino", then stat all of the files returned.
check the st_dev values, when you have a match you have the file.
 

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LEARN ABOUT SUSE

bootloader::path

Bootloader::Path(3)					User Contributed Perl Documentation				       Bootloader::Path(3)

NAME

       Bootloader::Path - abstraction of path constants

PREFACE

       This package provides path for configuration files. It is used to enable testing on created chroot.  It is used only for internal purpose.

SYNOPSIS

       "use Bootloader::Path;"

       "$path = Bootloader::Path::Prefix ($path);"

       "$path = Bootloader::Path::Logname();"

       "$path = Bootloader::Path::Fstab();"

       "$path = Bootloader::Path::Sysconfig();"

       "$path = Bootloader::Path::Grub_menulst();"

       "$path = Bootloader::Path::Grub_devicemap();"

       "$path = Bootloader::Path::Grub_grubconf();"

       "$path = Bootloader::Path::Grub_grub();"

       "$path = Bootloader::Path::Elilo_conf();"

       "$path = Bootloader::Path::Elilo_efi();"

       "$path = Bootloader::Path::Elilo_elilo();"

       "$path = Bootloader::Path::Lilo_lilo();"

       "$path = Bootloader::Path::Lilo_conf();"

       "$path = Bootloader::Path::Zipl_conf();"

       "$path = Bootloader::Path::Zipl_zipl();"

DESCRIPTION

	"$path = Bootloader::Path::Prefix ($);"
	 Add to absolute path prefix. Only internal function.  Allways retuns correct value.

	"$path = Bootloader::Path::Logname();"
	 Gets logname path.

	"$path = Bootloader::Path::Fstab();"
	 Gets fstab path.

	"$path = Bootloader::Path::Sysconfig();"
	 Gets path for bootloader sysconfig.

	"$path = Bootloader::Path::Grub_menulst();"
	 Gets path for grub configuration file menu.lst.

	"$path = Bootloader::Path::Grub_devicemap();"
	 Gets path for grub configuration file device.map.

	"$path = Bootloader::Path::Grub_grubconf();"
	 Gets path for grub configuration file grub.conf (this file contains commands for initialize bootloader).

	"$path = Bootloader::Path::Grub_grub();"
	 Gets path for grub binary

	"$path = Bootloader::Path::Elilo_conf();"
	 Gets path of elilo configuration file.

	"$path = Bootloader::Path::Elilo_efi();"
	 Gets path to efi directory.

	"$path = Bootloader::Path::Elilo_elilo();"
	 Gets path to elilo binary.

	"$path = Bootloader::Path::Lilo_lilo();"
	 Gets path to lilo(or powerlilo) binary.

	"$path = Bootloader::Path::Lilo_conf();"
	 Gets path to lilo(or powerlilo) configuration file.

	"$path = Bootloader::Path::Zipl_conf();"
	 Gets path to zipl configuration file.

	"$path = Bootloader::Path::Zipl_zipl();"
	 Gets path to zipl binary.

perl v5.12.1							    2010-05-14						       Bootloader::Path(3)
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