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Top Forums Programming A challenging problem involving symbolic links. Post 302177731 by ibloom on Sunday 23rd of March 2008 12:48:02 AM
Old 03-23-2008
A challenging problem involving symbolic links.

Hello,

I'm working on an application that bridges together several applications involved in creating a video workflow for editing with digital cinema cameras. The main platform is MacOSX.

Because of the nature of some of the utilities for working with this video footage I must spoof filenames by using symbolic links to essentially rename files. This hack works great most of the time, but on some systems (possibly Leopard systems) it runs into problems, I've isolated them into two:

In some situations, a symbolically linked file won't be recognized by a program, and won't appear in the softwares non-cocoa file selector. But other times it does. A system reboot will often remedy the problem, but I seek a way to check for this for users of my bridge.

The second is sometimes the program will load a symbolic link, but it will refer to it by a /Volume path only. So for example it will refer to the path to the symbolic link as /Volumes/Macintosh HD/Users/Username/Desktop etc. instead of /Users/Username/Desktop ... etc. Again, only in some situation not in all. (I believe mostly on Leopard, but I'm not certain yet)

Looking to gain a deeper understanding of how symbolic links are processed by the system. Thanks in advance for any insights.

IBloom
 

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LN(1)							      General Commands Manual							     LN(1)

NAME
ln - make links SYNOPSIS
ln [ -s ] sourcename [ targetname ] ln [ -s ] sourcename1 sourcename2 [ sourcename3 ... ] targetdirectory DESCRIPTION
A link is a directory entry referring to a file; the same file (together with its size, all its protection information, etc.) may have several links to it. There are two kinds of links: hard links and symbolic links. By default ln makes hard links. A hard link to a file is indistinguishable from the original directory entry; any changes to a file are effective independent of the name used to reference the file. Hard links may not span file systems and may not refer to directories. The -s option causes ln to create symbolic links. A symbolic link contains the name of the file to which it is linked. The referenced file is used when an open(2) operation is performed on the link. A stat(2) on a symbolic link will return the linked-to file; an lstat(2) must be done to obtain information about the link. The readlink(2) call may be used to read the contents of a symbolic link. Symbolic links may span file systems and may refer to directories. Given one or two arguments, ln creates a link to an existing file sourcename. If targetname is given, the link has that name; targetname may also be a directory in which to place the link; otherwise it is placed in the current directory. If only the directory is specified, the link will be made to the last component of sourcename. Given more than two arguments, ln makes links in targetdirectory to all the named source files. The links made will have the same name as the files being linked to. SEE ALSO
rm(1), cp(1), mv(1), link(2), readlink(2), stat(2), symlink(2) 4th Berkeley Distribution April 10, 1986 LN(1)
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