On Tue, Jul 14, 2020 at 05:59:05PM -0500, Clay Harris wrote: > I see IORING_OP_FIXED_FILE_TO_FD as a dup() function from fixed file > to process descriptor space. Exactly. > It would be nice if it would take > parameters to select the functionality of dup, dup2, dup3, F_DUPFD, > and F_DUPFD_CLOEXEC. As I recall, O_CLOFORK is on its way from > Posix-land, so I'd think there will also be something like > F_DUPFD_CLOFORK coming. We should certainly have any applicable file-descriptor flags, yes. And I'd expect to have three primary modes: "give me any unused file descriptor", "give me this exact file descriptor (closing it if open)", and "give me this exact file descriptor (erroring if it's already taken)". > It would be useful if IORING_REGISTER_xxx_UPDATE would accept a > placeholder value to ask the kernel not to mess with that index. > I think AT_FDCWD would be a good choice. It does accept -1 for that exact purpose.
