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Re: deleted current directory behaviour





Am 16.01.2018 um 05:13 schrieb Tony Cook:
Currently cygwin emulates* Linux (and most other POSIXish systems that
I'm aware of) by allowing the current directory to be removed:

tony@saturn ~/dev/perl/git
$ mkdir foo

tony@saturn ~/dev/perl/git
$ cd foo

tony@saturn ~/dev/perl/git/foo
$ rmdir ~/dev/perl/git/foo

but is inconsistent after that:

tony@saturn ~/dev/perl/git/foo
$ pwd
/home/tony/dev/perl/git/foo

tony@saturn ~/dev/perl/git/foo
$ cd ~/dev/perl/git/foo
bash: cd: /home/tony/dev/perl/git/foo: No such file or directory

tony@saturn ~/dev/perl/git/foo
$ cd ~/dev/perl/git

tony@saturn ~/dev/perl/git
$ ls foo
ls: cannot access 'foo': No such file or directory

The pwd isn't (only) the shell caching the current directory:

tony@saturn ~/dev/perl/git
$ cat 132648.c
#include <stdio.h>
#include <unistd.h>
#include <sys/stat.h>
#include <sys/types.h>

int main(void) {
   char buf[1000]; /* keeping this simple */
   if (mkdir("foo", 0700) < 0) {
     perror("mkdir");
     return 1;
   }
   if (chdir("foo") < 0) {
     perror("chdir");
     return 1;
   }
   if (rmdir("../foo") < 0) {
     perror("rmdir");
     return 1;
   }

   if (!getcwd(buf, sizeof(buf))) {
     perror("getcwd");
     return 1;
   }
   puts(buf);

   return 0;
}

tony@saturn ~/dev/perl/git
$ cc -o132648.exe 132648.c

tony@saturn ~/dev/perl/git
$ ./132648
/home/tony/dev/perl/git/foo

On Linux that program outputs:

tony@mars:.../newlib/git$ ./132648
getcwd: No such file or directory

Is that inconsistency with other platforms intentional?

If it isn't, are there any plans to make it consistent with
Linux/other POSIX-like systems?
The shell-internal pwd just echos $PWD, even if the directory does not exist anymore; this is consistent with Linux.

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