# syscalls(2)

    NAME
        syscalls - overview of MontaukOS system calls

    DESCRIPTION
        MontaukOS provides 150 system calls (numbers 0-149, sparsely
        assigned -- not every number in the range is in use) for
        userspace programs. Syscalls use the x86-64 SYSCALL instruction
        with the following register convention:

            RAX   Syscall number (in) / return value (out)
            RDI   Argument 1
            RSI   Argument 2
            RDX   Argument 3
            R10   Argument 4
            R8    Argument 5
            R9    Argument 6

        Include <Api/Syscall.hpp> for the numeric SYS_* constants and
        ABI structs, and <montauk/syscall.h> for typed wrappers in the
        montauk:: namespace. This page groups syscalls the same way the
        kernel source does (one subsystem header per group).

    PROCESS MANAGEMENT
    SYS_EXIT (0)
        Terminate the calling process.
            [[noreturn]] void montauk::exit(int code = 0);

    SYS_YIELD (1)
        Yield the remainder of the time slice.
            void montauk::yield();

    SYS_SLEEP_MS (2)
        Sleep for at least the given number of milliseconds.
            void montauk::sleep_ms(uint64_t ms);

    SYS_GETPID (3)
        Return the PID of the calling process.
            int montauk::getpid();

    SYS_SPAWN (20)
        Spawn a new process from an ELF binary on the VFS.
            int montauk::spawn(const char* path, const char* args = nullptr);

    SYS_WAITPID (23)
        Block until the given process has exited.
            void montauk::waitpid(int pid);

    SYS_GETARGS (25)
        Get the argument string passed to this process at spawn time.
            int montauk::getargs(char* buf, uint64_t maxLen);

    SYS_PROCLIST (61)
        List running processes (pid, parent, state, name, heap usage,
        accumulated CPU time).
            int montauk::proclist(montauk::abi::ProcInfo* buf, int max);

    SYS_KILL (62)
        Terminate another process by PID.
            int montauk::kill(int pid);

    SYS_CHDIR (96)
        Change the calling process's current working directory.
            int montauk::chdir(const char* path);

    SYS_GETCWD (95)
        Get the calling process's current working directory.
            int montauk::getcwd(char* buf, uint64_t maxLen);

    SYS_SETUSER (92)
        Associate a process with a logged-in user name (used by login/session
        management).
            int montauk::setuser(int pid, const char* name);

    SYS_GETUSER (93)
        Get the user name associated with the calling process.
            int montauk::getuser(char* buf, uint64_t maxLen);

    THREADING
        Threads share the spawning process's address space and heap
        (see montauk/heap.h for the heap lock). Declared in
        montauk/thread.h.

    SYS_THREAD_SPAWN (130)
        Spawn a new thread in the calling process. Returns a positive
        TID on success, -1 on failure.
            int montauk::thread_spawn(ThreadEntry entry, void* arg,
                                      uint64_t stack_bytes = 0);

    SYS_THREAD_EXIT (131)
        Terminate only the calling thread. If it is the main thread,
        the whole process exits.
            [[noreturn]] void montauk::thread_exit(int code = 0);

    SYS_THREAD_JOIN (132)
        Block until the given TID exits, then reclaim its kernel state.
            int montauk::thread_join(int tid, int* out_code = nullptr);

    SYS_THREAD_SELF (133)
        Return the calling thread's TID (equals getpid() for the main
        thread).
            int montauk::thread_self();

    CONSOLE I/O
    SYS_PRINT (4)
        Write a null-terminated string to the terminal.
            void montauk::print(const char* text);

    SYS_PUTCHAR (5)
        Write a single character to the terminal.
            void montauk::putchar(char c);

    FILE I/O
    SYS_OPEN (6)
        Open a file. Returns a handle or negative on error.
            int montauk::open(const char* path);

    SYS_READ (7)
        Read bytes from a file at a given offset.
            int montauk::read(int h, uint8_t* buf, uint64_t off, uint64_t sz);

    SYS_GETSIZE (8)
        Get the size of an open file in bytes.
            uint64_t montauk::getsize(int handle);

    SYS_CLOSE (9)
        Close a file handle.
            void montauk::close(int handle);

    SYS_READDIR (10)
        List directory entries (max 256 per call for VFS directories,
        128 for driver-backed listings such as 0:/os/). For larger
        directories use SYS_READDIR_AT.
            int montauk::readdir(const char* path, const char** names, int max);

    SYS_READDIR_AT (136)
        Paginated directory read. Returns entries starting at
        startIndex; call repeatedly with startIndex advanced by the
        returned count until it returns 0 to enumerate directories of
        any size.
            int montauk::readdir_at(const char* path, const char** names,
                                   int max, int startIndex);

    SYS_FWRITE (41)
        Write bytes to a file at a given offset.
            int montauk::fwrite(int handle, const uint8_t* buf,
                               uint64_t offset, uint64_t size);

    SYS_FCREATE (42)
        Create a new file on the target volume. Returns a handle or
        negative on error.
            int montauk::fcreate(const char* path);

    SYS_FDELETE (77)
        Delete a file.
            int montauk::fdelete(const char* path);

    SYS_FMKDIR (78)
        Create a directory.
            int montauk::fmkdir(const char* path);

    SYS_FRENAME (94)
        Rename or move a file/directory (used as the basis for file
        manager move operations).
            int montauk::frename(const char* oldPath, const char* newPath);

    SYS_DRIVELIST (79)
        List mounted drive numbers.
            int montauk::drivelist(int* outDrives, int max);

    SYS_DRIVELABEL (124)
        Get the volume label of a drive.
            int montauk::drivelabel(int drive, char* outLabel, int maxLen);

    SYS_DRIVEKIND (127)
        Get the block device kind backing a drive: 0=unknown/ramdisk,
        1=SATA, 2=SATAPI, 3=NVMe, 4=USB mass storage.
            int montauk::drivekind(int drive);

    MEMORY
    SYS_ALLOC (11)
        Map zeroed pages into the process address space.
            void* montauk::alloc(uint64_t size);

    SYS_FREE (12)
        Reserved (currently a no-op).
            void montauk::free(void* ptr);

    SYS_MEMSTATS (67)
        Get kernel-wide physical memory usage (total/free/used bytes,
        page size).
            void montauk::memstats(montauk::abi::MemStats* out);

    TIMEKEEPING
    SYS_GETTICKS (13)
        Get APIC timer ticks since boot.
            uint64_t montauk::get_ticks();

    SYS_GETMILLISECONDS (14)
        Get milliseconds elapsed since boot.
            uint64_t montauk::get_milliseconds();

    SYS_GETTIME (28)
        Get the current wall-clock date and time (UTC).
        Fills a montauk::abi::DateTime struct with Year, Month, Day,
        Hour, Minute, and Second fields.
            void montauk::gettime(montauk::abi::DateTime* out);

    SYS_SETTZ (90)
        Set the process/system timezone offset, in minutes from UTC.
            void montauk::settz(int offset_minutes);

    SYS_GETTZ (91)
        Get the current timezone offset, in minutes from UTC.
            int montauk::gettz();

    SYSTEM
    SYS_GETINFO (15)
        Get OS name, version string, API version, max process count,
        and the monotonic kernel build number.
            void montauk::get_info(montauk::abi::SysInfo* info);

    KEYBOARD
    SYS_ISKEYAVAILABLE (16)
        Check if a key event is pending (non-blocking).
            bool montauk::is_key_available();

    SYS_GETKEY (17)
        Get the next key event (press or release).
            void montauk::getkey(montauk::abi::KeyEvent* out);

    SYS_GETCHAR (18)
        Block until a printable character is typed.
            char montauk::getchar();

    SYS_INPUT_WAIT (123)
        Block until the input serial number differs from
        observedSerial or the timeout elapses; used to sleep
        efficiently between input-driven redraws.
            uint64_t montauk::input_wait(uint64_t observedSerial, uint64_t timeoutMs);

    MOUSE
    SYS_MOUSESTATE (47)
        Get the current mouse position, scroll delta, and button mask.
            void montauk::mouse_state(montauk::abi::MouseState* out);

    SYS_SETMOUSEBOUNDS (48)
        Set the maximum X/Y the mouse cursor may reach (e.g. framebuffer
        dimensions).
            void montauk::set_mouse_bounds(int32_t maxX, int32_t maxY);

    NETWORKING
    SYS_PING (19)
        Send an ICMP echo request and wait for reply.
            int32_t montauk::ping(uint32_t ip, uint32_t timeoutMs = 3000);

    SYS_RESOLVE (44)
        Resolve a hostname to an IPv4 address via DNS. Sends a UDP
        query to the configured DNS server and waits up to 5 seconds
        for a reply. Returns the IP in network byte order, or 0 on
        failure. IP address strings (e.g. "10.0.0.1") are detected
        and returned directly without a DNS query.
            uint32_t montauk::resolve(const char* hostname);

    SYS_GETNETCFG (37)
        Get the current network configuration (IP, mask, gateway, MAC,
        DNS server).
            void montauk::get_netcfg(montauk::abi::NetCfg* out);

    SYS_SETNETCFG (38)
        Set the network configuration (IP, mask, gateway, DNS server).
            int montauk::set_netcfg(const montauk::abi::NetCfg* cfg);

    SYS_NETSTATUS (125)
        Get adapter status including driver name, link state, polling mode,
        and RX/TX packet counters.
            int montauk::net_status(montauk::abi::NetStatus* out);

    SOCKETS
    SYS_SOCKET (29)
        Create a socket. type=SOCK_TCP (1) or SOCK_UDP (2).
        Returns fd or -1.
            int montauk::socket(int type);

    SYS_CONNECT (30)
        Connect a TCP socket to a remote host.
            int montauk::connect(int fd, uint32_t ip, uint16_t port);

    SYS_BIND (31)
        Bind a socket to a local port for listening.
            int montauk::bind(int fd, uint16_t port);

    SYS_LISTEN (32)
        Start listening for incoming TCP connections.
            int montauk::listen(int fd);

    SYS_ACCEPT (33)
        Accept an incoming connection on a listening socket.
        Returns a new socket fd for the client connection.
            int montauk::accept(int fd);

    SYS_SEND (34)
        Send data on a connected socket. Returns bytes sent.
            int montauk::send(int fd, const void* data, uint32_t len);

    SYS_RECV (35)
        Receive data from a connected socket. Returns bytes
        received, 0 if no data available, or -1 on close/error.
            int montauk::recv(int fd, void* buf, uint32_t maxLen);

    SYS_CLOSESOCK (36)
        Close a socket and release its resources.
            int montauk::closesocket(int fd);

    SYS_SENDTO (39)
        Send a UDP datagram to a specific destination.
            int montauk::sendto(int fd, const void* data, uint32_t len,
                               uint32_t destIp, uint16_t destPort);

    SYS_RECVFROM (40)
        Receive a UDP datagram. Returns the source address.
            int montauk::recvfrom(int fd, void* buf, uint32_t maxLen,
                                 uint32_t* srcIp, uint16_t* srcPort);

    FRAMEBUFFER
    SYS_FBINFO (21)
        Get framebuffer dimensions and format.
            void montauk::fb_info(montauk::abi::FbInfo* info);

    SYS_FBMAP (22)
        Map the framebuffer into process memory.
            void* montauk::fb_map();

    TERMINAL
    SYS_TERMSIZE (24)
        Get terminal dimensions (columns and rows).
            void montauk::termsize(int* cols, int* rows);

    SYS_TERMSCALE (43)
        Get or set the terminal font scale factor. When scale_x is 0,
        returns the current scale as (scale_y << 32 | scale_x). When
        scale_x is non-zero, sets the font scale and returns the new
        terminal dimensions as (rows << 32 | cols).
            void montauk::termscale(int scale_x, int scale_y);
            void montauk::get_termscale(int* scale_x, int* scale_y);

    RANDOM
    SYS_GETRANDOM (45)
        Fill a buffer with random bytes using RDTSC-seeded entropy.
        Returns the number of bytes written.
            int64_t montauk::getrandom(void* buf, uint32_t len);

    POWER MANAGEMENT
    SYS_RESET (26)
        Reboot the system.
            [[noreturn]] void montauk::reset();

    SYS_SHUTDOWN (27)
        Shut down the system.
            [[noreturn]] void montauk::shutdown();

    SYS_SUSPEND (89)
        Enter ACPI S3 sleep. Returns after wake, 0 on success.
            int montauk::suspend();

    SYS_POWER_REQUEST (135)
        Cross-process graceful power-off request channel. The desktop
        posts a pending action (POWER_REQ_SHUTDOWN / POWER_REQ_REBOOT)
        then exits; login.elf reads it with POWER_REQ_QUERY
        (read-and-clear), runs the shutdown stages, and finally calls
        shutdown()/reset(). See montauk::abi::PowerRequestAction.
            int montauk::power_request(int action);

    SYS_POWERINFO (149)
        Get the CPU power/thermal snapshot (HWP state, throttling,
        package temperature, base/max/effective frequency). Returns 0
        on success, -1 if unsupported by the running hardware.
            int montauk::syscall1(SYS_POWERINFO, (uint64_t)&out);
            // out: montauk::abi::PowerInfo*

    KERNEL LOG
    SYS_KLOG (46)
        Read from the kernel ring log buffer.
            int64_t montauk::read_klog(char* buf, uint64_t size);

    I/O REDIRECTION
        Used by the terminal app and similar programs to run a child
        process with its console I/O captured instead of going directly
        to the framebuffer console.

    SYS_SPAWN_REDIR (49)
        Spawn a process with its console I/O redirected to the caller.
            int montauk::spawn_redir(const char* path, const char* args = nullptr);

    SYS_CHILDIO_READ (50)
        Read buffered output produced by a redirected child.
            int montauk::childio_read(int childPid, char* buf, int maxLen);

    SYS_CHILDIO_WRITE (51)
        Write text input to a redirected child's stdin.
            int montauk::childio_write(int childPid, const char* data, int len);

    SYS_CHILDIO_WRITEKEY (52)
        Forward a raw key event to a redirected child.
            int montauk::childio_writekey(int childPid, const montauk::abi::KeyEvent* key);

    SYS_CHILDIO_SETTERMSZ (53)
        Tell a redirected child its terminal dimensions changed.
            int montauk::childio_settermsz(int childPid, int cols, int rows);

    WINDOW SERVER
        Window server syscalls are used by GUI programs to create and
        drive an on-screen window (see montauk/Window.hpp for the
        higher-level win_create/win_poll/win_present wrappers built on
        top of these).

    SYS_WINCREATE (54)
        Create a window and get its pixel buffer.
            int montauk::win_create(const char* title, int w, int h,
                                   montauk::abi::WinCreateResult* result);

    SYS_WINDESTROY (55)
        Destroy a window.
            int montauk::win_destroy(int id);

    SYS_WINPRESENT (56)
        Flush the pixel buffer to the screen.
            uint64_t montauk::win_present(int id);

    SYS_WINPOLL (57)
        Poll the next event (key, mouse, resize, close, scale) for a
        window.
            int montauk::win_poll(int id, montauk::abi::WinEvent* event);

    SYS_WINENUM (58)
        Enumerate all windows currently managed by the window server.
            int montauk::win_enumerate(montauk::abi::WinInfo* info, int max);

    SYS_WINMAP (59)
        Map (or re-map) a window's pixel buffer into the caller's
        address space.
            uint64_t montauk::win_map(int id);

    SYS_WINUNMAP (97)
        Unmap a window's pixel buffer from the caller's address space.
            int montauk::win_unmap(int id);

    SYS_WINSENDEVENT (60)
        Inject an event into a window's event queue.
            int montauk::win_sendevent(int id, const montauk::abi::WinEvent* event);

    SYS_WINRESIZE (64)
        Resize a window and its pixel buffer.
            uint64_t montauk::win_resize(int id, int w, int h);

    SYS_WINSETSCALE (65)
        Set the desktop-wide UI scale factor.
            int montauk::win_setscale(int scale);

    SYS_WINGETSCALE (66)
        Get the desktop-wide UI scale factor.
            int montauk::win_getscale();

    SYS_WINSETCURSOR (68)
        Set the mouse cursor shown while over a window (0=arrow,
        1=resize_h, 2=resize_v).
            int montauk::win_setcursor(int id, int cursor);

    SYS_WINSETFLAGS (126)
        Set window flags (e.g. WIN_FLAG_FULLSCREEN).
            int montauk::win_setflags(int id, uint32_t flags);

    DEVICES
    SYS_DEVLIST (63)
        Enumerate detected devices (CPU, interrupts, timers, input,
        USB, network, display, storage, PCI, audio, ACPI) for the
        device explorer app.
            int montauk::devlist(montauk::abi::DevInfo* buf, int max);

    SYS_DISKINFO (69)
        Get detailed info for one block device (model, serial, sector
        size, NCQ/TRIM/SMART support, etc.).
            int montauk::diskinfo(montauk::abi::DiskInfo* buf, int port);

    STORAGE
    SYS_PARTLIST (70)
        Enumerate GPT partitions across all block devices.
            int montauk::partlist(montauk::abi::PartInfo* buf, int max);

    SYS_DISKREAD (71)
        Raw, driver-agnostic sector read from a block device.
            int64_t montauk::disk_read(int blockDev, uint64_t lba,
                                      uint32_t sectorCount, void* buf);

    SYS_DISKWRITE (72)
        Raw, driver-agnostic sector write to a block device.
            int64_t montauk::disk_write(int blockDev, uint64_t lba,
                                       uint32_t sectorCount, const void* buf);

    SYS_GPTINIT (73)
        Initialize a fresh GPT partition table on a block device.
            int montauk::gpt_init(int blockDev);

    SYS_GPTADD (74)
        Add a partition to an existing GPT table.
            int montauk::gpt_add(const montauk::abi::GptAddParams* params);

    SYS_FSMOUNT (75)
        Mount a partition's filesystem onto a drive number.
            int montauk::fs_mount(int partIndex, int driveNum);

    SYS_FSFORMAT (76)
        Format a partition with a filesystem (FS_TYPE_FAT32 or
        FS_TYPE_EXT2).
            int montauk::fs_format(const montauk::abi::FsFormatParams* params);

    SYS_FS_SYNC (134)
        Flush all block-device write caches and cleanly unmount
        disk-backed volumes ahead of power-off. Returns the number of
        volumes unmounted. Part of the graceful shutdown sequence
        (see SYS_POWER_REQUEST).
            int montauk::fs_sync();

    AUDIO
    SYS_AUDIOOPEN (80)
        Open a mixer output stream at the given sample rate, channel
        count, and bit depth. Returns a stream handle.
            int montauk::audio_open(uint32_t sampleRate, uint8_t channels,
                                   uint8_t bitsPerSample);

    SYS_AUDIOCLOSE (81)
        Close an audio stream.
            void montauk::audio_close(int handle);

    SYS_AUDIOWRITE (82)
        Write PCM samples to an audio stream.
            int montauk::audio_write(int handle, const void* data, uint32_t size);

    SYS_AUDIOCTL (83)
        Control an audio stream or the global mixer. Commands 0-3 act
        on the stream named by the handle argument; commands 4-12 act
        on that stream's routing/mute state or the global master and
        ignore or reuse the handle as documented below.
            int montauk::audio_ctl(int handle, int cmd, int value);

        Convenience wrappers (all thin calls onto audio_ctl):
            audio_set_volume, audio_get_volume     AUDIO_CTL_{SET,GET}_VOLUME (0/1)
            audio_get_pos                          AUDIO_CTL_GET_POS (2)
            audio_pause, audio_resume              AUDIO_CTL_PAUSE (3)
            audio_get_output                       AUDIO_CTL_GET_OUTPUT (4): 0=HDA, 1=Bluetooth
            audio_set_output                       AUDIO_CTL_SET_OUTPUT (5): switch all streams
            (SET_OUTPUT, 5)                        switch a stream's output route
            audio_bt_status                        AUDIO_CTL_BT_STATUS (6)
            audio_set_master_volume, _get_          AUDIO_CTL_{SET,GET}_MASTER_VOLUME (7/8), 0-100
            audio_set_mute, audio_get_mute         AUDIO_CTL_{SET,GET}_MUTE (9/10), per-stream
            audio_set_master_mute, _get_           AUDIO_CTL_{SET,GET}_MASTER_MUTE (11/12)

    SYS_AUDIOLIST (128)
        Enumerate active mixer streams (owner PID, name, format,
        volume, mute/pause state).
            int montauk::audio_list(montauk::abi::AudioStreamInfo* buf, int maxCount);

    SYS_AUDIOWAIT (129)
        Return the current mixer state serial. With timeoutMs > 0,
        blocks until the serial differs from prevSerial or the timeout
        elapses; with timeoutMs == 0 it returns immediately.
            uint64_t montauk::audio_wait(uint64_t prevSerial, uint64_t timeoutMs);

    BLUETOOTH
    SYS_BTSCAN (84)
        Scan for discoverable Bluetooth devices for up to timeoutMs.
            int montauk::bt_scan(montauk::abi::BtScanResult* buf, int maxCount,
                                uint32_t timeoutMs);

    SYS_BTCONNECT (85)
        Connect (and pair/bond if needed) to a device by BD_ADDR.
            int montauk::bt_connect(const uint8_t* bdAddr);

    SYS_BTDISCONNECT (86)
        Disconnect from a device by BD_ADDR.
            int montauk::bt_disconnect(const uint8_t* bdAddr);

    SYS_BTLIST (87)
        List currently connected devices.
            int montauk::bt_list(montauk::abi::BtDevInfo* buf, int maxCount);

    SYS_BTINFO (88)
        Get local adapter info (BD_ADDR, name, init/scanning state).
            int montauk::bt_info(montauk::abi::BtAdapterInfo* buf);

    SYS_BTSETADDR (137)
        Change the adapter's BD_ADDR (6-byte buffer, byte 0 is the
        least-significant octet). Volatile -- apply after the last
        controller reset and persist separately to bluetooth.toml.
            int montauk::bt_set_addr(const uint8_t* bdAddr);

    SYS_BTBONDS (138)
        List bonded (paired) devices.
            int montauk::bt_bonds(montauk::abi::BtBondInfo* buf, int maxCount);

    SYS_BTFORGET (139)
        Forget a paired device; it must re-pair next time.
            int montauk::bt_forget(const uint8_t* bdAddr);

    SOFTWARE-DEFINED RADIO
        Receive-only SDR API. Receivers are enumerated by index in
        [0, SYS_SDR_COUNT); SYS_SDR_OPEN returns a handle used by the
        rest of the calls. Samples are delivered as interleaved 8-bit
        unsigned I/Q (CU8, SDR_FORMAT_CU8) from the device's ring
        buffer. Backed by an RTL-SDR (RTL2832U + R820T2) driver.

    SYS_SDR_COUNT (140)
        Number of available SDR receivers.
            int montauk::sdr_count();

    SYS_SDR_INFO (141)
        Get static/dynamic info for one receiver by index (name, tuner,
        frequency/sample-rate ranges, gain steps, present/streaming
        flags).
            int montauk::sdr_info(int index, montauk::abi::SdrDeviceInfo* out);

    SYS_SDR_OPEN (142)
        Open a receiver by index. Returns a handle.
            int montauk::sdr_open(int index);

    SYS_SDR_CLOSE (143)
        Close a receiver handle.
            int montauk::sdr_close(int handle);

    SYS_SDR_START (144)
        Begin streaming samples.
            int montauk::sdr_start(int handle);

    SYS_SDR_STOP (145)
        Stop streaming samples.
            int montauk::sdr_stop(int handle);

    SYS_SDR_READ (146)
        Non-blocking read of queued I/Q samples. Returns bytes copied.
            int montauk::sdr_read(int handle, void* buf, uint32_t len);

    SYS_SDR_SETPARAM (147)
        Set a tunable parameter (see SDR_PARAM_* below).
            int montauk::sdr_set_param(int handle, int param, uint64_t value);

    SYS_SDR_GETPARAM (148)
        Get a tunable parameter's current value.
            int64_t montauk::sdr_get_param(int handle, int param);

        Parameters (montauk::abi::SDR_PARAM_*): FREQ (center frequency,
        Hz), SAMPLE_RATE (Hz), GAIN_MODE (0=auto/AGC, 1=manual), GAIN
        (tenths of dB), FREQ_CORR (ppm), AGC (demod digital AGC, 0/1),
        DIRECT_SAMP (0=off, 1=I, 2=Q). Convenience wrappers exist for
        each: sdr_set_freq/sdr_get_freq, sdr_set_sample_rate/
        sdr_get_sample_rate, sdr_set_gain_mode, sdr_set_gain,
        sdr_set_freq_correction, sdr_set_agc.

    CLIPBOARD
    SYS_CLIPBOARD_SET_TEXT (119)
        Set the system clipboard's text contents (max
        CLIPBOARD_MAX_TEXT_BYTES, 256 KiB).
            int montauk::clipboard_set_text(const char* data, uint32_t len);

    SYS_CLIPBOARD_GET_INFO (120)
        Get the clipboard's current size and serial number (for
        change detection).
            int montauk::clipboard_get_info(montauk::abi::ClipboardInfo* out);

    SYS_CLIPBOARD_GET_TEXT (121)
        Read the clipboard's text contents.
            int montauk::clipboard_get_text(char* buf, uint32_t bufLen,
                                           uint32_t* outLen, uint64_t* outSerial = nullptr);

    SYS_CLIPBOARD_CLEAR (122)
        Clear the clipboard.
            int montauk::clipboard_clear();

    GENERIC IPC
        Handle-based IPC primitives underlying streams, mailboxes,
        waitsets, and shared-memory surfaces (see kernel/src/Ipc/Ipc.hpp).
        All are accessed via numeric handles with rights-based security
        and can be waited on with SYS_WAIT_HANDLE or a waitset.

    SYS_DUPHANDLE (98)
        Duplicate a handle (e.g. to hand a copy to a child process).
            int montauk::dup_handle(int handle);

    SYS_WAIT_HANDLE (99)
        Block until a handle's signals intersect wantedSignals, or
        timeoutMs elapses. See IPC_SIGNAL_* (READABLE, WRITABLE,
        PEER_CLOSED, EXITED, READY).
            uint32_t montauk::wait_handle(int handle, uint32_t wantedSignals,
                                         uint64_t timeoutMs = ~0ULL);

    SYS_STREAM_CREATE (100)
        Create a byte-pipe stream, returning a read handle and a write
        handle.
            int montauk::stream_create(int* outReadHandle, int* outWriteHandle,
                                      uint32_t capacity = 0);

    SYS_STREAM_READ (101)
        Read bytes from a stream handle.
            int montauk::stream_read(int handle, void* buf, int maxLen);

    SYS_STREAM_WRITE (102)
        Write bytes to a stream handle.
            int montauk::stream_write(int handle, const void* data, int len);

    SYS_MAILBOX_CREATE (103)
        Create a message-queue mailbox, returning a send handle and a
        receive handle.
            int montauk::mailbox_create(int* outSendHandle, int* outRecvHandle);

    SYS_MAILBOX_SEND (104)
        Send a typed message, optionally attaching a handle to
        transfer to the receiver.
            int montauk::mailbox_send(int handle, uint32_t msgType, const void* data,
                                     uint16_t len, int attachHandle = -1);

    SYS_MAILBOX_RECV (105)
        Receive a message.
            int montauk::mailbox_recv(int handle, uint32_t* outMsgType, void* data,
                                     uint16_t* inOutLen, int* outAttachHandle = nullptr);

    SYS_WAITSET_CREATE (106)
        Create a waitset for multiplexing waits across many handles.
            int montauk::waitset_create();

    SYS_WAITSET_ADD (107)
        Add a handle and its signal mask to a waitset.
            int montauk::waitset_add(int waitsetHandle, int targetHandle,
                                    uint32_t signals);

    SYS_WAITSET_REMOVE (108)
        Remove an entry from a waitset by index.
            int montauk::waitset_remove(int waitsetHandle, int index);

    SYS_WAITSET_WAIT (109)
        Block until any member handle's watched signals fire, or
        timeoutMs elapses.
            int montauk::waitset_wait(int waitsetHandle, montauk::abi::IpcWaitResult* outReady,
                                     uint64_t timeoutMs = ~0ULL);

    SYS_PROC_OPEN (110)
        Open a handle to another process by PID (for waiting on its
        exit via IPC_SIGNAL_EXITED, etc.).
            int montauk::proc_open(int pid);

    SYS_SURFACE_CREATE (111)
        Create a shared pixel-buffer surface of byteSize bytes.
            int montauk::surface_create(uint64_t byteSize);

    SYS_SURFACE_MAP (112)
        Map a surface into the caller's address space.
            void* montauk::surface_map(int handle);

    SYS_SURFACE_RESIZE (113)
        Resize a surface.
            int montauk::surface_resize(int handle, uint64_t newSize);

    SHARED LIBRARIES
    SYS_LOAD_LIB (114)
        Load a shared library ELF (.lib) into the caller's address
        space.
            int montauk::load_lib(const char* path);

    SYS_UNLOAD_LIB (115)
        Unload a previously loaded library.
            int montauk::unload_lib(int handle);

    SYS_DLSYM (116)
        Resolve a symbol offset within a loaded library to a callable
        address.
            void* montauk::dlsym(int handle, uint64_t symbolOffset);

    SYS_GETLIBBASE (117)
        Get the base virtual address a loaded library was mapped at.
            uint64_t montauk::get_libbase(int handle);

    CRASH REPORTING
    SYS_CRASH_REPORT (118)
        Retrieve the kernel-filled crash report for the last faulting
        process (exception vector/name, faulting address, register
        state, page-fault error bits). Used by the crashpad app.
            int montauk::crash_report(montauk::abi::CrashReportInfo* out);

    SEE ALSO
        spawn(2), file(2), framebuffer(2), malloc(3), intro(1)

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