NOTE

pub const NOTE = switch (native_os) {
    .driverkit, .ios, .maccatalyst, .macos, .tvos, .visionos, .watchos => struct {
        // https://github.com/apple-oss-distributions/xnu/blob/main/bsd/sys/event.h
        /// On input, TRIGGER causes the event to be triggered for output.
        pub const TRIGGER = 0x01000000;
        /// ignore input fflags
        pub const FFNOP = 0x00000000;
        /// and fflags
        pub const FFAND = 0x40000000;
        /// or fflags
        pub const FFOR = 0x80000000;
        /// copy fflags
        pub const FFCOPY = 0xc0000000;
        /// mask for operations
        pub const FFCTRLMASK = 0xc0000000;
        pub const FFLAGSMASK = 0x00ffffff;
        /// low water mark
        pub const LOWAT = 0x00000001;
        /// OOB data
        pub const OOB = 0x00000002;
        /// vnode was removed
        pub const DELETE = 0x00000001;
        /// data contents changed
        pub const WRITE = 0x00000002;
        /// size increased
        pub const EXTEND = 0x00000004;
        /// attributes changed
        pub const ATTRIB = 0x00000008;
        /// link count changed
        pub const LINK = 0x00000010;
        /// vnode was renamed
        pub const RENAME = 0x00000020;
        /// vnode access was revoked
        pub const REVOKE = 0x00000040;
        /// No specific vnode event: to test for EVFILT_READ activation
        pub const NONE = 0x00000080;
        /// vnode was unlocked by flock(2)
        pub const FUNLOCK = 0x00000100;
        /// process exited
        pub const EXIT = 0x80000000;
        /// process forked
        pub const FORK = 0x40000000;
        /// process exec'd
        pub const EXEC = 0x20000000;
        /// shared with EVFILT_SIGNAL
        pub const SIGNAL = 0x08000000;
        /// exit status to be returned, valid for child process only
        pub const EXITSTATUS = 0x04000000;
        /// provide details on reasons for exit
        pub const EXIT_DETAIL = 0x02000000;
        /// mask for signal & exit status
        pub const PDATAMASK = 0x000fffff;
        pub const PCTRLMASK = 0xf0000000;
        pub const EXIT_DETAIL_MASK = 0x00070000;
        pub const EXIT_DECRYPTFAIL = 0x00010000;
        pub const EXIT_MEMORY = 0x00020000;
        pub const EXIT_CSERROR = 0x00040000;
        /// will react on memory pressure
        pub const VM_PRESSURE = 0x80000000;
        /// will quit on memory pressure, possibly after cleaning up dirty state
        pub const VM_PRESSURE_TERMINATE = 0x40000000;
        /// will quit immediately on memory pressure
        pub const VM_PRESSURE_SUDDEN_TERMINATE = 0x20000000;
        /// there was an error
        pub const VM_ERROR = 0x10000000;
        /// data is seconds
        pub const SECONDS = 0x00000001;
        /// data is microseconds
        pub const USECONDS = 0x00000002;
        /// data is nanoseconds
        pub const NSECONDS = 0x00000004;
        /// absolute timeout
        pub const ABSOLUTE = 0x00000008;
        /// ext[1] holds leeway for power aware timers
        pub const LEEWAY = 0x00000010;
        /// system does minimal timer coalescing
        pub const CRITICAL = 0x00000020;
        /// system does maximum timer coalescing
        pub const BACKGROUND = 0x00000040;
        /// with ABSOLUTE: causes the timer to continue to tick across sleep, still uses gettimeofday epoch
        /// with MACHTIME and ABSOLUTE: uses mach continuous time epoch
        /// without ABSOLUTE: continues to tick across sleep
        pub const MACH_CONTINUOUS_TIME = 0x00000080;
        /// data is mach absolute time units
        pub const MACHTIME = 0x00000100;
    },
    .dragonfly => struct {
        pub const FFNOP = 0;
        pub const TRACK = 1;
        pub const DELETE = 1;
        pub const LOWAT = 1;
        pub const TRACKERR = 2;
        pub const OOB = 2;
        pub const WRITE = 2;
        pub const EXTEND = 4;
        pub const CHILD = 4;
        pub const ATTRIB = 8;
        pub const LINK = 16;
        pub const RENAME = 32;
        pub const REVOKE = 64;
        pub const PDATAMASK = 1048575;
        pub const FFLAGSMASK = 16777215;
        pub const TRIGGER = 16777216;
        pub const EXEC = 536870912;
        pub const FFAND = 1073741824;
        pub const FORK = 1073741824;
        pub const EXIT = 2147483648;
        pub const FFOR = 2147483648;
        pub const FFCTRLMASK = 3221225472;
        pub const FFCOPY = 3221225472;
        pub const PCTRLMASK = 4026531840;
    },
    .netbsd => struct {
        /// ignore input fflags
        pub const FFNOP = 0x00000000;
        /// AND fflags
        pub const FFAND = 0x40000000;
        /// OR fflags
        pub const FFOR = 0x80000000;
        /// copy fflags
        pub const FFCOPY = 0xc0000000;
        /// masks for operations
        pub const FFCTRLMASK = 0xc0000000;
        pub const FFLAGSMASK = 0x00ffffff;
        /// On input, TRIGGER causes the event to be triggered for output.
        pub const TRIGGER = 0x01000000;
        /// low water mark
        pub const LOWAT = 0x00000001;
        /// vnode was removed
        pub const DELETE = 0x00000001;
        /// data contents changed
        pub const WRITE = 0x00000002;
        /// size increased
        pub const EXTEND = 0x00000004;
        /// attributes changed
        pub const ATTRIB = 0x00000008;
        /// link count changed
        pub const LINK = 0x00000010;
        /// vnode was renamed
        pub const RENAME = 0x00000020;
        /// vnode access was revoked
        pub const REVOKE = 0x00000040;
        /// vnode was opened
        pub const OPEN = 0x00000080;
        /// file closed (no FWRITE)
        pub const CLOSE = 0x00000100;
        /// file closed (FWRITE)
        pub const CLOSE_WRITE = 0x00000200;
        /// file was read
        pub const READ = 0x00000400;
        /// process exited
        pub const EXIT = 0x80000000;
        /// process forked
        pub const FORK = 0x40000000;
        /// process exec'd
        pub const EXEC = 0x20000000;
        /// mask for signal & exit status
        pub const PDATAMASK = 0x000fffff;
        pub const PCTRLMASK = 0xf0000000;
        /// follow across forks
        pub const TRACK = 0x00000001;
        /// could not track child
        pub const TRACKERR = 0x00000002;
        /// am a child process
        pub const CHILD = 0x00000004;
        /// shared with EVFILT_SIGNAL
        pub const SIGNAL = 0x08000000;
        /// data is milliseconds
        pub const MSECONDS = 0x00000000;
        /// data is seconds
        pub const SECONDS = 0x00000001;
        /// data is microseconds
        pub const USECONDS = 0x00000002;
        /// data is nanoseconds
        pub const NSECONDS = 0x00000003;
        /// timeout is absolute
        pub const ABSTIME = 0x00000010;
    },
    .freebsd => struct {
        /// On input, TRIGGER causes the event to be triggered for output.
        pub const TRIGGER = 0x01000000;
        /// ignore input fflags
        pub const FFNOP = 0x00000000;
        /// and fflags
        pub const FFAND = 0x40000000;
        /// or fflags
        pub const FFOR = 0x80000000;
        /// copy fflags
        pub const FFCOPY = 0xc0000000;
        /// mask for operations
        pub const FFCTRLMASK = 0xc0000000;
        pub const FFLAGSMASK = 0x00ffffff;
        /// low water mark
        pub const LOWAT = 0x00000001;
        /// behave like poll()
        pub const FILE_POLL = 0x00000002;
        /// vnode was removed
        pub const DELETE = 0x00000001;
        /// data contents changed
        pub const WRITE = 0x00000002;
        /// size increased
        pub const EXTEND = 0x00000004;
        /// attributes changed
        pub const ATTRIB = 0x00000008;
        /// link count changed
        pub const LINK = 0x00000010;
        /// vnode was renamed
        pub const RENAME = 0x00000020;
        /// vnode access was revoked
        pub const REVOKE = 0x00000040;
        /// vnode was opened
        pub const OPEN = 0x00000080;
        /// file closed, fd did not allow write
        pub const CLOSE = 0x00000100;
        /// file closed, fd did allow write
        pub const CLOSE_WRITE = 0x00000200;
        /// file was read
        pub const READ = 0x00000400;
        /// process exited
        pub const EXIT = 0x80000000;
        /// process forked
        pub const FORK = 0x40000000;
        /// process exec'd
        pub const EXEC = 0x20000000;
        /// mask for signal & exit status
        pub const PDATAMASK = 0x000fffff;
        pub const PCTRLMASK = 0xf0000000;
        /// data is seconds
        pub const SECONDS = 0x00000001;
        /// data is milliseconds
        pub const MSECONDS = 0x00000002;
        /// data is microseconds
        pub const USECONDS = 0x00000004;
        /// data is nanoseconds
        pub const NSECONDS = 0x00000008;
        /// timeout is absolute
        pub const ABSTIME = 0x00000010;
    },
    .openbsd => struct {
        // data/hint flags for EVFILT.{READ|WRITE}
        pub const LOWAT = 0x0001;
        pub const EOF = 0x0002;
        // data/hint flags for EVFILT.EXCEPT and EVFILT.{READ|WRITE}
        pub const OOB = 0x0004;
        // data/hint flags for EVFILT.VNODE
        pub const DELETE = 0x0001;
        pub const WRITE = 0x0002;
        pub const EXTEND = 0x0004;
        pub const ATTRIB = 0x0008;
        pub const LINK = 0x0010;
        pub const RENAME = 0x0020;
        pub const REVOKE = 0x0040;
        pub const TRUNCATE = 0x0080;
        // data/hint flags for EVFILT.PROC
        pub const EXIT = 0x80000000;
        pub const FORK = 0x40000000;
        pub const EXEC = 0x20000000;
        pub const PDATAMASK = 0x000fffff;
        pub const PCTRLMASK = 0xf0000000;
        pub const TRACK = 0x00000001;
        pub const TRACKERR = 0x00000002;
        pub const CHILD = 0x00000004;
        // data/hint flags for EVFILT.DEVICE
        pub const CHANGE = 0x00000001;
        // data/hint flags for EVFILT_USER
        pub const FFNOP = 0x00000000;
        pub const FFAND = 0x40000000;
        pub const FFOR = 0x80000000;
        pub const FFCOPY = 0xc0000000;
        pub const FFCTRLMASK = 0xc0000000;
        pub const FFLAGSMASK = 0x00ffffff;
        pub const TRIGGER = 0x01000000;
    },
    else => void,
}