Add F_DUPFD_QUERY to fcntl

[rruuaanng]

Feature or enhancement

Proposal:

It's used to query and copy a target file descriptor. for example:

int fd = /* open a file */;
/* 'ret' must be greater equal than 5 */
int ret = fcntl(fd, F_DUPFD_QUERY, 5);

Has this already been discussed elsewhere?

No response given

Links to previous discussion of this feature:

No response

Linked PRs

• gh-127385: Add F_DUPFD_QUERY to fcntl #127386