|  | # Zircon System Calls | 
|  |  | 
|  | ## Handles | 
|  | + [handle_close](syscalls/handle_close.md) - close a handle | 
|  | + [handle_duplicate](syscalls/handle_duplicate.md) - create a duplicate handle (optionally with reduced rights) | 
|  | + [handle_replace](syscalls/handle_replace.md) - create a new handle (optionally with reduced rights) and destroy the old one | 
|  |  | 
|  | ## Objects | 
|  | + [object_get_child](syscalls/object_get_child.md) - find the child of an object by its koid | 
|  | + [object_get_cookie](syscalls/object_get_cookie.md) - read an object cookie | 
|  | + [object_get_info](syscalls/object_get_info.md) - obtain information about an object | 
|  | + [object_get_property](syscalls/object_get_property.md) - read an object property | 
|  | + [object_set_cookie](syscalls/object_set_cookie.md) - write an object cookie | 
|  | + [object_set_property](syscalls/object_set_property.md) - modify an object property | 
|  | + [object_signal](syscalls/object_signal.md) - set or clear the user signals on an object | 
|  | + [object_signal_peer](syscalls/object_signal.md) - set or clear the user signals in the opposite end | 
|  | + [object_wait_many](syscalls/object_wait_many.md) - wait for signals on multiple objects | 
|  | + [object_wait_one](syscalls/object_wait_one.md) - wait for signals on one object | 
|  | + [object_wait_async](syscalls/object_wait_async.md) - asynchronous notifications on signal change | 
|  |  | 
|  | ## Threads | 
|  | + [thread_create](syscalls/thread_create.md) - create a new thread within a process | 
|  | + [thread_exit](syscalls/thread_exit.md) - exit the current thread | 
|  | + [thread_read_state](syscalls/thread_read_state.md) - read register state from a thread | 
|  | + [thread_start](syscalls/thread_start.md) - cause a new thread to start executing | 
|  | + [thread_write_state](syscalls/thread_write_state.md) - modify register state of a thread | 
|  |  | 
|  | ## Processes | 
|  | + [process_create](syscalls/process_create.md) - create a new process within a job | 
|  | + [process_read_memory](syscalls/process_read_memory.md) - read from a process's address space | 
|  | + [process_start](syscalls/process_start.md) - cause a new process to start executing | 
|  | + [process_write_memory](syscalls/process_write_memory.md) - write to a process's address space | 
|  | + [process_exit](syscalls/process_exit.md) - exit the current process | 
|  |  | 
|  | ## Jobs | 
|  | + [job_create](syscalls/job_create.md) - create a new job within a job | 
|  | + [job_set_policy](syscalls/job_set_policy.md) - modify policies for a job and its descendants | 
|  |  | 
|  | ## Tasks (Thread, Process, or Job) | 
|  | + [task_bind_exception_port](syscalls/task_bind_exception_port.md) - attach an exception port to a task | 
|  | + [task_kill](syscalls/task_kill.md) - cause a task to stop running | 
|  | + [task_resume](syscalls/task_resume.md) - cause a suspended task to continue running | 
|  | + [task_suspend](syscalls/task_suspend.md) - cause a task to be suspended | 
|  |  | 
|  | ## Channels | 
|  | + [channel_call](syscalls/channel_call.md) - synchronously send a message and receive a reply | 
|  | + [channel_create](syscalls/channel_create.md) - create a new channel | 
|  | + [channel_read](syscalls/channel_read.md) - receive a message from a channel | 
|  | + [channel_read_etc](syscalls/channel_read.md) - receive a message from a channel with handle information | 
|  | + [channel_write](syscalls/channel_write.md) - write a message to a channel | 
|  |  | 
|  | ## Sockets | 
|  | + [socket_create](syscalls/socket_create.md) - create a new socket | 
|  | + [socket_read](syscalls/socket_read.md) - read data from a socket | 
|  | + [socket_write](syscalls/socket_write.md) - write data to a socket | 
|  |  | 
|  | ## Fifos | 
|  | + [fifo_create](syscalls/fifo_create.md) - create a new fifo | 
|  | + [fifo_read](syscalls/fifo_read.md) - read data from a fifo | 
|  | + [fifo_write](syscalls/fifo_write.md) - write data to a fifo | 
|  |  | 
|  | ## Events and Event Pairs | 
|  | + [event_create](syscalls/event_create.md) - create an event | 
|  | + [eventpair_create](syscalls/eventpair_create.md) - create a connected pair of events | 
|  |  | 
|  | ## Ports | 
|  | + [port_create](syscalls/port_create.md) - create a port | 
|  | + [port_queue](syscalls/port_queue.md) - send a packet to a port | 
|  | + [port_wait](syscalls/port_wait.md) - wait for packets to arrive on a port | 
|  | + [port_cancel](syscalls/port_cancel.md) - cancel notifications from async_wait | 
|  |  | 
|  | ## Futexes | 
|  | + [futex_wait](syscalls/futex_wait.md) - wait on a futex | 
|  | + [futex_wake](syscalls/futex_wake.md) - wake waiters on a futex | 
|  | + [futex_requeue](syscalls/futex_requeue.md) - wake some waiters and requeue other waiters | 
|  |  | 
|  | ## Virtual Memory Objects (VMOs) | 
|  | + [vmo_create](syscalls/vmo_create.md) - create a new vmo | 
|  | + [vmo_read](syscalls/vmo_read.md) - read from a vmo | 
|  | + [vmo_write](syscalls/vmo_write.md) - write to a vmo | 
|  | + [vmo_clone](syscalls/vmo_clone.md) - clone a vmo | 
|  | + [vmo_get_size](syscalls/vmo_get_size.md) - obtain the size of a vmo | 
|  | + [vmo_set_size](syscalls/vmo_set_size.md) - adjust the size of a vmo | 
|  | + [vmo_op_range](syscalls/vmo_op_range.md) - perform an operation on a range of a vmo | 
|  |  | 
|  | ## Virtual Memory Address Regions (VMARs) | 
|  | + [vmar_allocate](syscalls/vmar_allocate.md) - create a new child VMAR | 
|  | + [vmar_map](syscalls/vmar_map.md) - map a VMO into a process | 
|  | + [vmar_unmap](syscalls/vmar_unmap.md) - unmap a memory region from a process | 
|  | + [vmar_protect](syscalls/vmar_protect.md) - adjust memory access permissions | 
|  | + [vmar_destroy](syscalls/vmar_destroy.md) - destroy a VMAR and all of its children | 
|  |  | 
|  | ## Cryptographically Secure RNG | 
|  | + [cprng_draw](syscalls/cprng_draw.md) | 
|  | + [cprng_add_entropy](syscalls/cprng_add_entropy.md) | 
|  |  | 
|  | ## Time | 
|  | + [nanosleep](syscalls/nanosleep.md) - sleep for some number of nanoseconds | 
|  | + [clock_get](syscalls/clock_get.md) - read a system clock | 
|  | + [ticks_get](syscalls/ticks_get.md) - read high-precision timer ticks | 
|  | + [ticks_per_second](syscalls/ticks_per_second.md) - read the number of high-precision timer ticks in a second | 
|  |  | 
|  | ## Timers | 
|  | + [timer_create](syscalls/timer_create.md) - create a timer object | 
|  | + [timer_set](syscalls/timer_set.md) - start a timer | 
|  | + [timer_cancel](syscalls/timer_cancel.md) - cancel a timer | 
|  |  | 
|  | ## Hypervisor guests | 
|  | + [guest_create](syscalls/guest_create.md) - create a hypervisor guest | 
|  | + [guest_set_trap](syscalls/guest_set_trap.md) - set a trap in a hypervisor guest | 
|  |  | 
|  | ## Virtual CPUs | 
|  | + [vcpu_create](syscalls/vcpu_create.md) - create a virtual cpu | 
|  | + [vcpu_resume](syscalls/vcpu_resume.md) - resume execution of a virtual cpu | 
|  | + [vcpu_interrupt](syscalls/vcpu_interrupt.md) - raise an interrupt on a virtual cpu | 
|  | + [vcpu_read_state](syscalls/vcpu_read_state.md) - read state from a virtual cpu | 
|  | + [vcpu_write_state](syscalls/vcpu_write_state.md) - write state to a virtual cpu | 
|  |  | 
|  | ## Global system information | 
|  | + [system_get_features](syscalls/system_get_features.md) - get hardware-specific features | 
|  | + [system_get_num_cpus](syscalls/system_get_num_cpus.md) - get number of CPUs | 
|  | + [system_get_physmem](syscalls/system_get_physmem.md) - get physical memory size | 
|  | + [system_get_version](syscalls/system_get_version.md) - get version string | 
|  |  | 
|  | ## Logging | 
|  | + log_create - create a kernel managed log reader or writer | 
|  | + log_write - write log entry to log | 
|  | + log_read - read log entries from log | 
|  |  | 
|  | ## Multi-function | 
|  | + [vmar_unmap_handle_close_thread_exit](syscalls/vmar_unmap_handle_close_thread_exit.md) - three-in-one | 
|  | + [futex_wake_handle_close_thread_exit](syscalls/futex_wake_handle_close_thread_exit.md) - three-in-one | 
|  |  | 
|  | ## DDK | 
|  | + [cache_flush](syscalls/cache_flush.md) - Flush CPU data and/or instruction caches | 
|  | + [interrupt_ack](syscalls/interrupt_ack.md) - Acknowledge an interrupt object | 
|  | + [interrupt_bind](syscalls/interrupt_bind.md) - Bind an interrupt object to a port | 
|  | + [interrupt_create](syscalls/interrupt_create.md) - Create a physical or virtual interrupt object | 
|  | + [interrupt_destroy](syscalls/interrupt_destroy.md) - Destroy an interrupt object | 
|  | + [interrupt_trigger](syscalls/interrupt_trigger.md) - Trigger a virtual interrupt object | 
|  | + [interrupt_wait](interrupt_wait.md) - Wait on an interrupt object | 
|  | + [smc_call](syscalls/smc_call.md) - Make an SMC call from user space | 
|  | + acpi_uefi_rsdp | 
|  | + mmap_device_io | 
|  | + framebuffer_set_range | 
|  | + vmo_create_contiguous | 
|  | + vmo_create_physical |