deleted current directory behaviour

Tue Jan 16 07:55:00 GMT 2018

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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