Function register_files_update [src]

Updates registered file descriptors. Updates are applied starting at the provided offset in the original file descriptors slice. There are three kind of updates: turning a sparse entry (where the fd is -1) into a real one removing an existing entry (set the fd to -1) replacing an existing entry with a new fd Adding new file descriptors must be done with register_files.

Prototype

pub fn register_files_update(self: *IoUring, offset: u32, fds: []const posix.fd_t) !void

Parameters

self: *IoUringoffset: u32fds: []const posix.fd_t

Source

  pub fn register_files_update(self: *IoUring, offset: u32, fds: []const posix.fd_t) !void {
    assert(self.fd >= 0);

    const FilesUpdate = extern struct {
        offset: u32,
        resv: u32,
        fds: u64 align(8),
    };
    var update = FilesUpdate{
        .offset = offset,
        .resv = @as(u32, 0),
        .fds = @as(u64, @intFromPtr(fds.ptr)),
    };

    const res = linux.io_uring_register(
        self.fd,
        .REGISTER_FILES_UPDATE,
        @as(*const anyopaque, @ptrCast(&update)),
        @as(u32, @intCast(fds.len)),
    );
    try handle_registration_result(res);
}  