* wrong errno value set by readlinkat()
@ 2023-04-18 10:21 Bruno Haible
2023-04-18 11:56 ` Corinna Vinschen
0 siblings, 1 reply; 2+ messages in thread
From: Bruno Haible @ 2023-04-18 10:21 UTC (permalink / raw)
To: cygwin
Hi,
When an empty path argument is passed to the readlinkat() function,
POSIX:2018 specifies that the function fails with error ENOENT:
https://pubs.opengroup.org/onlinepubs/9699919799/functions/readlinkat.html
"These functions shall fail if:
...
[ENOENT]
A component of path does not name an existing file or path is an empty
string."
In Cygwin 3.4.6, readlinkat() fails with error EBADF instead.
How to reproduce:
============================== foo.c ===================================
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
int main ()
{
char buf[80];
int ret = readlinkat (AT_FDCWD, "", buf, sizeof (buf));
int err = errno;
printf ("ret = %d, errno = %d = \"%s\"\n", ret, err, strerror (err));
return 0;
}
========================================================================
$ gcc -Wall foo.c
$ ./a.exe
Expected output:
ret = -1, errno = 2 = "No such file or directory"
Actual output:
ret = -1, errno = 9 = "Bad file descriptor"
Bruno
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: wrong errno value set by readlinkat()
2023-04-18 10:21 wrong errno value set by readlinkat() Bruno Haible
@ 2023-04-18 11:56 ` Corinna Vinschen
0 siblings, 0 replies; 2+ messages in thread
From: Corinna Vinschen @ 2023-04-18 11:56 UTC (permalink / raw)
To: Bruno Haible; +Cc: cygwin
On Apr 18 12:21, Bruno Haible via Cygwin wrote:
> Hi,
>
> When an empty path argument is passed to the readlinkat() function,
> POSIX:2018 specifies that the function fails with error ENOENT:
>
> https://pubs.opengroup.org/onlinepubs/9699919799/functions/readlinkat.html
> "These functions shall fail if:
> ...
> [ENOENT]
> A component of path does not name an existing file or path is an empty
> string."
>
> In Cygwin 3.4.6, readlinkat() fails with error EBADF instead.
Thanks, I pushed a patch.
A test release cygwin-3.5.0-0.283.gfa84aa4dd2fb containing this patch
is building right now. You can install it via setup as soon as it's
available (roughly in an hour).
Thanks again,
Corinna
^ permalink raw reply [flat|nested] 2+ messages in thread
end of thread, other threads:[~2023-04-18 11:56 UTC | newest]
Thread overview: 2+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2023-04-18 10:21 wrong errno value set by readlinkat() Bruno Haible
2023-04-18 11:56 ` Corinna Vinschen
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).