Reference for unit 'Linux': Constants¶

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