Section 2

Section 2 of the manual describes the Linux system calls. A system call is an entry point into the Linux kernel. Usually, system calls are not invoked directly: instead, most system calls have corresponding C library wrapper functions which perform the steps required (e.g., trapping to kernel mode) in order to invoke the system call. Thus, making a system call looks the same as invoking a normal library function.

Page 4

i386_set_ldt: i386_get_ldt , i386_set_ldt — manage i386 per-process Local Descriptor Table entries
i386_vm86: control vm86-related functions
idle: make process 0 idle
inb: outb, outw, outl, outsb, outsw, outsl, inb, inw, inl, insb, insw, insl, outb_p, outw_p, outl_p, inb_p, inw_p, inl_p - port I/O
inb_p: outb, outw, outl, outsb, outsw, outsl, inb, inw, inl, insb, insw, insl, outb_p, outw_p, outl_p, inb_p, inw_p, inl_p - port I/O
init_module: init_module, finit_module - load a kernel module
inl: outb, outw, outl, outsb, outsw, outsl, inb, inw, inl, insb, insw, insl, outb_p, outw_p, outl_p, inb_p, inw_p, inl_p - port I/O
inl_p: outb, outw, outl, outsb, outsw, outsl, inb, inw, inl, insb, insw, insl, outb_p, outw_p, outl_p, inb_p, inw_p, inl_p - port I/O
inotify_add_watch: add a watch to an initialized inotify instance
inotify_init: inotify_init, inotify_init1 - initialize an inotify instance
inotify_init1: inotify_init, inotify_init1 - initialize an inotify instance
inotify_rm_watch: remove an existing watch from an inotify instance
insb: outb, outw, outl, outsb, outsw, outsl, inb, inw, inl, insb, insw, insl, outb_p, outw_p, outl_p, inb_p, inw_p, inl_p - port I/O
insl: outb, outw, outl, outsb, outsw, outsl, inb, inw, inl, insb, insw, insl, outb_p, outw_p, outl_p, inb_p, inw_p, inl_p - port I/O
insw: outb, outw, outl, outsb, outsw, outsl, inb, inw, inl, insb, insw, insl, outb_p, outw_p, outl_p, inb_p, inw_p, inl_p - port I/O
intro: introduction to system calls
intro: introduction to system calls and error numbers
inw: outb, outw, outl, outsb, outsw, outsl, inb, inw, inl, insb, insw, insl, outb_p, outw_p, outl_p, inb_p, inw_p, inl_p - port I/O
inw_p: outb, outw, outl, outsb, outsw, outsl, inb, inw, inl, insb, insw, insl, outb_p, outw_p, outl_p, inb_p, inw_p, inl_p - port I/O
io_cancel: cancel an outstanding asynchronous I/O operation
io_destroy: destroy an asynchronous I/O context
io_getevents: read asynchronous I/O events from the completion queue
io_setup: create an asynchronous I/O context
io_submit: submit asynchronous I/O blocks for processing
io_uring_enter: initiate and/or complete asynchronous I/O
io_uring_enter2: io_uring_enter - initiate and/or complete asynchronous I/O
io_uring_register: register files or user buffers for asynchronous I/O
io_uring_setup: setup a context for performing asynchronous I/O
ioctl: control device
ioctl: control device
ioctl_console: ioctls for console terminal and virtual consoles
ioctl_fat: manipulating the FAT filesystem
ioctl_ficlone: ioctl_ficlonerange, ioctl_ficlone - share some the data of one file with another file
ioctl_ficlonerange: ioctl_ficlonerange, ioctl_ficlone - share some the data of one file with another file
ioctl_fideduperange: share some the data of one file with another file
ioctl_fslabel: get or set a filesystem label
ioctl_getfsmap: retrieve the physical layout of the filesystem
ioctl_iflags: ioctl() operations for inode flags
ioctl_ns: ioctl() operations for Linux namespaces
ioctl_tty: ioctls for terminals and serial lines
ioctl_userfaultfd: create a file descriptor for handling page faults in user space
ioctl_xfs_ag_geometry: query XFS allocation group geometry information
ioctl_xfs_bulkstat: query information for a batch of XFS inodes
ioctl_xfs_fsbulkstat: query information for a batch of XFS inodes
ioctl_xfs_fscounts: query XFS summary counter information
ioctl_xfs_fsgeometry: report XFS filesystem layout and features
ioctl_xfs_fsgetxattr: query information for an open file
ioctl_xfs_fsgetxattra: ioctl_xfs_fsgetxattr - query information for an open file
ioctl_xfs_fsinumbers: extract a list of valid inode numbers from an XFS filesystem
ioctl_xfs_fssetxattr: ioctl_xfs_fsgetxattr - query information for an open file
ioctl_xfs_getbmap: ioctl_xfs_getbmapx - query extent information for an open file
ioctl_xfs_getbmapa: ioctl_xfs_getbmapx - query extent information for an open file
ioctl_xfs_getbmapx: query extent information for an open file
ioctl_xfs_getresblks: query and set XFS free space reservation information
ioctl_xfs_goingdown: shut down an XFS filesystem
ioctl_xfs_inumbers: query allocation information for groups of XFS inodes
ioctl_xfs_scrub_metadata: check XFS filesystem metadata
ioctl_xfs_setresblks: ioctl_xfs_getresblks - query and set XFS free space reservation information
ioperm: set port input/output permissions
iopl: change I/O privilege level
ioprio_get: ioprio_get, ioprio_set - get/set I/O scheduling class and priority
ioprio_set: ioprio_get, ioprio_set - get/set I/O scheduling class and priority
ipc: System V IPC system calls
isastream: afs_syscall, break, fattach, fdetach, ftime, getmsg, getpmsg, gtty, isastream, lock, madvise1, mpx, prof, profil, putmsg, putpmsg, security, stty, tuxcall, ulimit, vserver - unimplemented system calls
issetugid: is current process tainted by uid or gid changes
jail: jail , jail_get , jail_set , jail_remove , jail_attach — create and manage system jails
jail_attach: jail , jail_get , jail_set , jail_remove , jail_attach — create and manage system jails
jail_get: jail , jail_get , jail_set , jail_remove , jail_attach — create and manage system jails
jail_remove: jail , jail_get , jail_set , jail_remove , jail_attach — create and manage system jails
jail_set: jail , jail_get , jail_set , jail_remove , jail_attach — create and manage system jails
kcmp: compare two processes to determine if they share a kernel resource
kenv: kernel environment
kevent: kqueue , kevent — kernel event notification mechanism
kexec_file_load: kexec_load, kexec_file_load - load a new kernel for later execution
kexec_load: kexec_load, kexec_file_load - load a new kernel for later execution
keyctl: manipulate the kernel's key management facility
kill: send signal to a process
kill: send signal to a process
killpg: send signal to a process group
kldfind: returns the fileid of a kld file
kldfirstmod: return first module id from the kld file specified
kldload: load KLD files into the kernel
kldnext: return the fileid of the next kld file
kldstat: get status of kld file
kldsym: look up address by symbol name in a KLD
kldunload: kldunload , kldunloadf — unload kld files
kldunloadf: kldunload , kldunloadf — unload kld files
kqueue: kqueue , kevent — kernel event notification mechanism
ktrace: process tracing
landlock_add_rule: add a new Landlock rule to a ruleset
landlock_create_ruleset: create a new Landlock ruleset
landlock_restrict_self: enforce a Landlock ruleset
lchflags: chflags , lchflags , fchflags , chflagsat — set file flags
lchmod: chmod , fchmod , lchmod , fchmodat — change mode of file
lchown: chown, fchown, lchown, fchownat - change ownership of a file
lchown: chown , fchown , lchown , fchownat — change owner and group of a file
lchown32: chown, fchown, lchown, fchownat - change ownership of a file
lgetfh: getfh , lgetfh , getfhat — get file handle
lgetxattr: getxattr, lgetxattr, fgetxattr - retrieve an extended attribute value
link: link, linkat - make a new name for a file