Linux unit

Linux-specific operating system calls.

The linux unit contains Linux specific operating system calls.

The platform independent functionality of the FPC 1.0.X version of the linux unit has been split out over the UNIX, baseunix and unixutil units.

The X86-specific parts have been moved to the X86 unit.

Classes and records

`EPoll_Data`	record	Epoll data call structure.
`EPoll_Event`	record	Structure used in epoll_ctl call.
`inotify_event`	record	INotify event structure.
`statx_timestamp`	record
`tstatx`	record
`TSysInfo`	record	Record with system information, used by the call.
`user_cap_data`	record	Capability description record.
`user_cap_header`	record	Root user capabilities header.
`user_desc`	record	TLS segment descriptor.

Procedures and functions

`capget`	function	Return the capabilities for the indicated thread.
`capset`	function	Set the capabilities for the indicated thread.
`clock_getres`	function	Get clock resolution.
`clock_gettime`	function	Get the time of a clock.
`clock_settime`	function	Set the time of a clock.
`clone`	function	Clone current process (create new thread).
`epoll_create`	function	Create new epoll file descriptor.
`epoll_create1`	function
`epoll_ctl`	function	Modify an epoll file descriptor.
`epoll_pwait`	function
`epoll_wait`	function	Wait for an event on an epoll file descriptor.
`fdatasync`	function	Synchronize the data in memory with the data on storage device.
`futex`	function	Perform a futex operation.
`futex_op`	function	Futex operation:.
`futimens`	function
`getrandom`	function
`inotify_add_watch`	function	Add a watch to a notify file descriptor.
`inotify_init`	function	Initialize a new inotify file descriptor.
`inotify_init1`	function	Initialize a new inotify file descriptor with extra options.
`inotify_rm_watch`	function	Remove watch from Inotify file descriptor.
`modify_ldt`	function
`sched_yield`	procedure	Yield the processor to another thread.
`setregid`	function	Set Real and Effective Group ID.
`setreuid`	function
`statx`	function
`sync_file_range`	function	Force committing of data to disk.
`Sysinfo`	function	Return kernel system information.
`utimensat`	function

Types

`__s16`	type
`__s32`	type
`__s64`	type
`__u16`	type
`__u32`	type
`__u64`	type
`clockid_t`	type	Clock id type.
`PEPoll_Data`	type	Pointer to EPoll_Data record.
`PEpoll_Event`	type	Pointer to EPoll_Event type.
`Pinotify_event`	type	Pointer to inotify_event structure.
`pstatx`	type
`pstatx_timestamp`	type
`PSysInfo`	type	Pointer to record.
`Puser_cap_data`	type	Pointer to user_cap_data record.
`Puser_cap_header`	type	Pointer to user_cap_header record.
`PUser_Desc`	type	Pointer to User_Desc record.
`TCloneFunc`	procedure type	Clone function prototype.
`TEPoll_Data`	type	Alias for EPoll_Data type.
`TEPoll_Event`	type	Alias for EPoll_Event type.
`TUser_Desc`	type	Alias for user_desc record.

Constants

`CAP_AUDIT_CONTROL`	constant	Allow manipulation of kernel auditing features.
`CAP_AUDIT_WRITE`	constant	Allow writing to kernel audit log.
`CAP_CHOWN`	constant	Perform chown operation.
`CAP_DAC_OVERRIDE`	constant	Bypass file operation (rwx) checks.
`CAP_DAC_READ_SEARCH`	constant	Bypass file read-only operation checks.
`CAP_FOWNER`	constant	Bypass owner ID checks.
`CAP_FS_MASK`	constant	?
`CAP_FSETID`	constant	Do not clear SUID/GUID bits on modified files.
`CAP_IPC_LOCK`	constant	Allow memory locking calls.
`CAP_IPC_OWNER`	constant	Bypass permission checks on IPC operations.
`CAP_KILL`	constant	Bypass permission checks for sending signals.
`CAP_LEASE`	constant	Allow file leases.
`CAP_LINUX_IMMUTABLE`	constant	Allow setting ext2 file attributes.
`CAP_MKNOD`	constant	Allow creation of special files through mknod calls.
`CAP_NET_ADMIN`	constant	Allow network operations (e.g. setting socket options).
`CAP_NET_BIND_SERVICE`	constant	Allow binding to ports less than 1024.
`CAP_NET_BROADCAST`	constant	Allow socket broadcast operations.
`CAP_NET_RAW`	constant	Allow use of RAW and PACKET sockets.
`CAP_SETGID`	constant	Allow GID manipulations.
`CAP_SETPCAP`	constant	Allow to set other process' capabilities.
`CAP_SETUID`	constant	Allow process ID manipulations.
`CAP_SYS_ADMIN`	constant	Allow various system administration calls.
`CAP_SYS_BOOT`	constant	Allow reboot calls.
`CAP_SYS_CHROOT`	constant	Allow chroot calls.
`CAP_SYS_MODULE`	constant	Allow loading/unloading of kernel modules.
`CAP_SYS_NICE`	constant	Allowing raising process and thread priorities.
`CAP_SYS_PACCT`	constant	Allow acct calls.
`CAP_SYS_PTRACE`	constant	Allow ptrace calls.
`CAP_SYS_RAWIO`	constant	Allow raw I/O port operations.
`CAP_SYS_RESOURCE`	constant	Allow use of special resources or raising of resource limits.
`CAP_SYS_TIME`	constant	Allow system or real-time clock modification.
`CAP_SYS_TTY_CONFIG`	constant	Allow vhangup calls.
`CLOCK_MONOTONIC`	constant	Monotonic system time since some undetermined start point. Can change if time is set.
`CLOCK_MONOTONIC_COARSE`	constant	Less precise (but faster) version of CLOCK_MONOTONIC.
`CLOCK_MONOTONIC_RAW`	constant	Like CLOCK_MONOTONIC, not subject to NTP adjustments.
`CLOCK_PROCESS_CPUTIME_ID`	constant	Processs-specific high-resolution timer from the CPU.
`CLOCK_REALTIME`	constant	System wide real-time clock. Can only be set by root.
`CLOCK_REALTIME_COARSE`	constant	Less precise (but faster) version of CLOCK_REALTIME.
`CLOCK_SGI_CYCLE`	constant	High resolution timer.
`CLOCK_THREAD_CPUTIME_ID`	constant	Thread-specific high-resolution timer from the CPU.
`CLOCKS_MASK`	constant	Mask for supported clocks.
`CLOCKS_MONO`	constant	Monotonic clocks mask.
`CLONE_CHILD_CLEARTID`	constant	Clone option: Erase child thread ID in child memory space when child exits.
`CLONE_CHILD_SETTID`	constant	Clone option: Store child thread ID in child memory.
`CLONE_DETACHED`	constant	Clone option: Start clone detached.
`CLONE_FILES`	constant	option: open files shared between processes.
`CLONE_FS`	constant	option: fs info shared between processes.
`CLONE_NEWNS`	constant	Clone options: Start child in new (file system) namespace.
`CLONE_PARENT`	constant	Clone options: Set child parent to parent of calling process.
`CLONE_PARENT_SETTID`	constant	Clone option: Store child thread ID in memory in both parent and child.
`CLONE_PID`	constant	option: PID shared between processes.
`CLONE_PTRACE`	constant	Clone options: if parent is traced, trace child also.
`CLONE_SETTLS`	constant	Clone option: The newtls parameter is the TLS descriptor of the child.
`CLONE_SIGHAND`	constant	option: signal handlers shared between processes.
`CLONE_STOPPED`	constant	Clone option: Start child in stopped state.
`CLONE_SYSVSEM`	constant	Clone option: Caller and child share the same semaphore undo values.
`CLONE_THREAD`	constant	Clone options: Set child in thread group of calling process.
`CLONE_UNTRACED`	constant	Clone option: Do not allow a ptrace call on this clone.
`CLONE_VFORK`	constant	Clone options: suspend parent till child execs.
`CLONE_VM`	constant	option: VM shared between processes.
`CSIGNAL`	constant	option: Signal mask to be sent at exit.
`EPOLL_CTL_ADD`	constant	Add filedescriptor to list of events.
`EPOLL_CTL_DEL`	constant	Delete event for filedescriptor.
`EPOLL_CTL_MOD`	constant	Modify event for filedescriptor.
`EPOLLERR`	constant	event_wait error condition on file descriptor.
`EPOLLET`	constant	Set event_wait edge trigger behaviour on file descriptor.
`EPOLLHUP`	constant	event_wait hang up event.
`EPOLLIN`	constant	event_wait input file descriptor ready event.
`EPOLLONESHOT`	constant	Set single-shot behaviour on epoll_wait.
`EPOLLOUT`	constant	event_wait output file descriptor ready event.
`EPOLLPRI`	constant	event_wait high priority data available on input file descriptor.
`FUTEX_CMP_REQUEUE`	constant	Futex option: requeue waiting processes on other futex, but check it's value first.
`FUTEX_FD`	constant	Futex option: Associate file descriptor with futex.
`FUTEX_LOCK_PI`	constant	Futex option: Undocumented.
`FUTEX_OP_ADD`	constant	Futex operation: Undocumented.
`FUTEX_OP_ANDN`	constant	Futex operation: Undocumented.
`FUTEX_OP_CMP_EQ`	constant	Futex operation: Undocumented.
`FUTEX_OP_CMP_GE`	constant	Futex operation: Undocumented.
`FUTEX_OP_CMP_GT`	constant	Futex operation: Undocumented.
`FUTEX_OP_CMP_LE`	constant	Futex operation: Undocumented.
`FUTEX_OP_CMP_LT`	constant	Futex operation: Undocumented.
`FUTEX_OP_CMP_NE`	constant	Futex operation: Undocumented.
`FUTEX_OP_OPARG_SHIFT`	constant	Futex operation: Undocumented.
`FUTEX_OP_OR`	constant	Futex operation: Undocumented.
`FUTEX_OP_SET`	constant	Futex operation: Undocumented.
`FUTEX_OP_XOR`	constant	Futex operation: Undocumented.
`FUTEX_REQUEUE`	constant	Futex option: requeue waiting processes on other futex.
`FUTEX_TRYLOCK_PI`	constant	Futex option: Undocumented.
`FUTEX_UNLOCK_PI`	constant	Futex option: Undocumented.
`FUTEX_WAIT`	constant	Futex option: Wait on futex till wake call arrives.
`FUTEX_WAKE`	constant	Futex option: wakes any waiting processes on this futex.
`FUTEX_WAKE_OP`	constant	Futex option: Undocumented.
`GIO_CMAP`	constant	IOCTL: Get color palette on VGA+.
`GIO_FONT`	constant	IOCTL: Get font in expanded form.
`GIO_FONTX`	constant	IOCTL: Get font in consolefontdesc record.
`GIO_SCRNMAP`	constant	IOCTL: get screen mapping from kernel.
`GIO_UNIMAP`	constant	IOCTL: get unicode-to-font mapping from kernel.
`GIO_UNISCRNMAP`	constant	IOCTL: get full Unicode screen mapping.
`GRND_NONBLOCK`	constant
`GRND_RANDOM`	constant
`IN_ACCESS`	constant	Data was read from file.
`IN_ALL_EVENTS`	constant	All possible events OR-ed together.
`IN_ATTRIB`	constant	File attributes changed.
`IN_CLOEXEC`	constant	Inotify close on exec flag.
`IN_CLOSE`	constant	File was closed (read or write).
`IN_CLOSE_NOWRITE`	constant	File opened for read was closed.
`IN_CLOSE_WRITE`	constant	File opened for write was closed.
`IN_CREATE`	constant	A file was created in the directory.
`IN_DELETE`	constant	A file was deleted from the directory.
`IN_DELETE_SELF`	constant	Directory or file under observation was deleted.
`IN_DONT_FOLLOW`	constant	Do not follow symlinks.
`IN_IGNORED`	constant	Watch was ignored (removed). Only reported.
`IN_ISDIR`	constant	Event subject is a directory (reported only).
`IN_MASK_ADD`	constant	Add events to existing watch (OR-ing the sets) if one exists.
`IN_MODIFY`	constant	Data was written to file.
`IN_MOVE`	constant	File was moved (in or out of directory).
`IN_MOVE_SELF`	constant	Directory or file under observation was moved.
`IN_MOVED_FROM`	constant	File was moved away from watched directory.
`IN_MOVED_TO`	constant	File was moved into watched directory.
`IN_NONBLOCK`	constant	Do not block on read.
`IN_ONESHOT`	constant	Only report one event, then remove the watch.
`IN_ONLYDIR`	constant	Only watch filename if it is a directory.
`IN_OPEN`	constant	File was opened.
`IN_Q_OVERFLOW`	constant	Queue overflowed. Only reported.
`IN_UNMOUNT`	constant	File system on which file resides was unmounted. Only reported.
`KB_101`	constant	IOCTL: Keyboard types: 101 keys.
`KB_84`	constant	IOCTL: Keyboard types: 84 keys.
`KB_OTHER`	constant	IOCTL: Keyboard types: other type.
`KD_GRAPHICS`	constant	IOCTL: Tty modes: graphics mode.
`KD_TEXT`	constant	IOCTL: Tty modes: Text mode.
`KD_TEXT0`	constant	IOCTL: Tty modes: Text mode (obsolete).
`KD_TEXT1`	constant	IOCTL: Tty modes: Text mode (obsolete).
`KDADDIO`	constant	IOCTL: add i/o port as valid.
`KDDELIO`	constant	IOCTL: delete i/o port as valid.
`KDDISABIO`	constant	IOCTL: disable i/o to video board.
`KDENABIO`	constant	IOCTL: enable i/o to video board.
`KDFONTOP`	constant	IOCTL: font operations.
`KDGETKEYCODE`	constant	IOCTL: read kernel keycode table entry.
`KDGETLED`	constant	IOCTL: return current led state.
`KDGETMODE`	constant	IOCTL: get current mode.
`KDGKBDIACR`	constant	IOCTL: read kernel accent table.
`KDGKBTYPE`	constant	IOCTL: get keyboard type.
`KDMAPDISP`	constant	IOCTL: map display into address space.
`KDMKTONE`	constant	IOCTL: generate tone.
`KDSETKEYCODE`	constant	IOCTL: write kernel keycode table entry.
`KDSETLED`	constant	IOCTL: set led state.
`KDSETMODE`	constant	IOCTL: set text/graphics mode.
`KDSIGACCEPT`	constant	IOCTL: accept kbd generated signals.
`KDSKBDIACR`	constant	IOCTL: write kernel accent table.
`KDUNMAPDISP`	constant	IOCTL: unmap display from address space.
`KIOCSOUND`	constant	IOCTL: start/stop sound generation (0 for off).
`LED_CAP`	constant	IOCTL: LED_CAP : caps lock led.
`LED_NUM`	constant	IOCTL: LED_SCR : Num lock led.
`LED_SCR`	constant	IOCTL: LED_SCR : scroll lock led.
`LINUX_CAPABILITY_VERSION`	constant	Current capability version in use by kernel.
`MAP_DENYWRITE`	constant	Read-only.
`MAP_EXECUTABLE`	constant	Memory area is marked as executable.
`MAP_GROWSDOWN`	constant	Memory map grows down, like stack.
`MAP_LOCKED`	constant	Memory pages are locked.
`MAP_NORESERVE`	constant	Do not check for reservations.
`MAX_CLOCKS`	constant	Maximum number of clocks in the system.
`MODIFY_LDT_CONTENTS_CODE`	constant	Modify_ldt option: Undocumented.
`MODIFY_LDT_CONTENTS_DATA`	constant	Modify_ldt option: Undocumented.
`MODIFY_LDT_CONTENTS_STACK`	constant	Modify_ldt option: Undocumented.
`O_CLOEXEC`	constant	Close on exec flag: close file handle on exec call.
`PIO_CMAP`	constant	IOCTL: Set color palette on VGA+.
`PIO_FONT`	constant	IOCTL: Use font in expanded form.
`PIO_FONTRESET`	constant	IOCTL: Reset to default font.
`PIO_FONTX`	constant	IOCTL: Set font in consolefontdesc record.
`PIO_SCRNMAP`	constant	IOCTL: put screen mapping table in kernel.
`PIO_UNIMAP`	constant	IOCTL: put unicode-to-font mapping in kernel.
`PIO_UNIMAPCLR`	constant	IOCTL: clear table, possibly advise hash algorithm.
`PIO_UNISCRNMAP`	constant	IOCTL: set full Unicode screen mapping.
`POLLMSG`	constant	Unused in Linux.
`POLLRDHUP`	constant	Peer Shutdown/closed writing half of connection.
`POLLREMOVE`	constant	Undocumented Linux extension of Poll.
`SPLICE_F_GIFT`	constant	Pages spliced in are a gift.
`SPLICE_F_MORE`	constant	Expect more data.
`SPLICE_F_MOVE`	constant	Move pages instead of copying.
`SPLICE_F_NONBLOCK`	constant	Don't block on pipe splicing operations.
`STATX__RESERVED`	constant
`STATX_ALL`	constant
`STATX_ATIME`	constant
`STATX_ATTR_APPEND`	constant
`STATX_ATTR_AUTOMOUNT`	constant
`STATX_ATTR_COMPRESSED`	constant
`STATX_ATTR_ENCRYPTED`	constant
`STATX_ATTR_IMMUTABLE`	constant
`STATX_ATTR_NODUMP`	constant
`STATX_BASIC_STATS`	constant
`STATX_BLOCKS`	constant
`STATX_BTIME`	constant
`STATX_CTIME`	constant
`STATX_GID`	constant
`STATX_INO`	constant
`STATX_MODE`	constant
`STATX_MTIME`	constant
`STATX_NLINK`	constant
`STATX_SIZE`	constant
`STATX_TYPE`	constant
`STATX_UID`	constant
`SYNC_FILE_RANGE_WAIT_AFTER`	constant	Wait upon write-out of specified pages in the range after performing any write.
`SYNC_FILE_RANGE_WAIT_BEFORE`	constant	Wait for write-out of previously-submitted specified pages before writing more data.
`SYNC_FILE_RANGE_WRITE`	constant	Initiate write of all dirty pages in the specified range.
`UD_CONTENTS_CODE`	constant	TLS segment descriptor: Undocumented.
`UD_CONTENTS_DATA`	constant	TLS segment descriptor: Undocumented.
`UD_CONTENTS_STACK`	constant	TLS segment descriptor: Undocumented.
`UD_LIMIT_IN_PAGES`	constant	TLS segment descriptor: Undocumented.
`UD_LM`	constant	TLS segment descriptor: Undocumented.
`UD_READ_EXEC_ONLY`	constant	TLS segment descriptor: Undocumented.
`UD_SEG_32BIT`	constant	TLS segment descriptor : Undocumented.
`UD_SEG_NOT_PRESENT`	constant	TLS segment descriptor: Undocumented.
`UD_USEABLE`	constant	TLS segment descriptor: Undocumented.

Uses

An experiment, built from development snapshots. Not the official Free Pascal or Lazarus documentation.