Function rustix::backend::conv::ret_discarded_fd

pub(super) unsafe fn ret_discarded_fd(raw: RetReg<R0>) -> Result<()>

Convert the return value of dup2 and dup3.

When these functions succeed, they return the same value as their second argument, so we don’t construct a new OwnedFd.

Safety

The caller must ensure that this is the return value of a syscall which returns a file descriptor.