DoctorWkt
Add .. links to directories?
There seems to be a convention that file .. in every directory is a link to the directory itself (like . in more modern UNIX). I think this should be created by the build script.
There seems to be a convention that file .. in every directory is a link to itself
That certainly solves the mystery of how "ls" could possibly show the current directory. We didn't have the original ls program until now, and ken couldn't remember how it worked.
I believe .. in the assembler controls what is often called "origin", the base address at which the code is loaded, so it has a certain mnemonic value (if different than the current usage).
Files with ".." string (symbol/filename) literals:
phil@p27:~/pdp7-unix/scans$ grep '<\.\.>' *.s
db.s:dotdot: <..>; 040040; 040040; 040040
phil@p27:~/pdp7-unix/scans$ grep 056056 *.s
as.s:o56056: 056056
ds.s: 056056; 040040; 040040; 040040
dsw.s:dd: 056056;040040;040040;040040
ls.s:dd: 056056;040040;040040;040040
pd.s: 056056; 040040; 040040; 040040
stat.s: 056056; 040040; 040040; 040040
In db and as I think they refer to the symbol.
In dsw it's opened and read, looks for a non-empty entry, and dumps core. if the core file is executed, it removes that file name?!
In ls, it's the default directory to list (and if ls is invoked as "list" the output is long, so I think "list" should be a link to system/ls)
In pd, it's opened and read, and also passed to creat?!?
In stat it's used as the directory to search to get status on the argument file name.
pd seems to remove empty entries from the current directory (pd = purge dir?). I assume creat doesn't change the directory of a file?
On 10/21/19 1:41 PM, aap wrote:
pd seems to remove empty entries from the current directory (pd = purge dir?). I assume creat doesn't change the directory of a file?
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Maybe prune dir?
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