file-exists? does return #f on large files

[Christian Kellermann]

Reported by Sven Hartrumpf

I have just lost some files (fortunately, they can be restored somehow)
because file-exists? returned #f for large files (> 2 GB).

Confirmed by Moritz for 32 bit chickens (on a 32 bit machine)

It does do the right thing on 64bit chickens

[Christian Kellermann]

(define (file-exists? name)

(##sys#check-string name 'file-exists?)
(##sys#pathname-resolution

name
(lambda (name)

(and (##sys#file-info (##sys#platform-fixup-pathname name)) name) )

#:exists?) )

(define (##sys#pathname-resolution name thunk . _)

(thunk (##sys#expand-home-path name)) )

What's that keyword for anyway? Also wouldn't a call to fstat alone suffice without even filling the stat structure?

[Christian Kellermann]

On a 32 bit chicken fstat fails with
(gdb) p perror()
file-exists: Value too large for defined data type

[Christian Kellermann]

Which results from

EOVERFLOW

(stat()) path refers to a file whose size cannot be represented in the type off_t. This can occur when an application com‐
piled on a 32-bit platform without -D_FILE_OFFSET_BITS=64 calls stat() on a file whose size exceeds (2<<31)-1 bits.

of course

[felix winkelmann]

This should work now . In the current masterversion, file-exists? will signal an error on any other error condition but ENOENT.

[felix winkelmann]

Milestone 4.8.0 deleted