Section 2: System Calls
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B
C
D
E
F
G
I
K
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N
O
P
Q
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T
U
V
W
Section index
- accept(2)
- accept a connection on a socket
- accept4(2)
- accept a connection on a socket
- access(2)
- check real user's permissions for a file
- acct(2)
- switch process accounting on or off
- add_key(2)
- add a key to the kernel's key management facility
- adjtimex(2)
- tune kernel clock
- afs_syscall(2)
- unimplemented system calls
- alarm(2)
- set an alarm clock for delivery of a signal
- alloc_hugepages(2)
- allocate or free huge pages
- arch_prctl(2)
- set architecture-specific thread state
- arm_fadvise(2)
- predeclare an access pattern for file data
- arm_fadvise64_64(2)
- predeclare an access pattern for file data
- arm_sync_file_range(2)
- sync a file segment with disk
- bdflush(2)
- start, flush, or tune buffer-dirty-flush daemon
- bind(2)
- bind a name to a socket
- break(2)
- unimplemented system calls
- brk(2)
- change data segment size
- cacheflush(2)
- flush contents of instruction and/or data cache
- capget(2)
- set/get capabilities of thread(s)
- capset(2)
- set/get capabilities of thread(s)
- chdir(2)
- change working directory
- chmod(2)
- change permissions of a file
- chown(2)
- change ownership of a file
- chown32(2)
- change ownership of a file
- chroot(2)
- change root directory
- clock_getres(2)
- clock and time functions
- clock_gettime(2)
- clock and time functions
- clock_nanosleep(2)
- high-resolution sleep with specifiable clock
- clock_settime(2)
- clock and time functions
- clone(2)
- create a child process
- __clone2(2)
- create a child process
- clone2(2)
- create a child process
- close(2)
- close a file descriptor
- connect(2)
- initiate a connection on a socket
- creat(2)
- open and possibly create a file or device
- create_module(2)
- create a loadable module entry
- delete_module(2)
- unload a kernel module
- dup(2)
- duplicate a file descriptor
- dup2(2)
- duplicate a file descriptor
- dup3(2)
- duplicate a file descriptor
- epoll_create(2)
- open an epoll file descriptor
- epoll_create1(2)
- open an epoll file descriptor
- epoll_ctl(2)
- control interface for an epoll descriptor
- epoll_pwait(2)
- wait for an I/O event on an epoll file descriptor
- epoll_wait(2)
- wait for an I/O event on an epoll file descriptor
- eventfd(2)
- create a file descriptor for event notification
- eventfd2(2)
- create a file descriptor for event notification
- execve(2)
- execute program
- _Exit(2)
- terminate the calling process
- _exit(2)
- terminate the calling process
- exit(2)
- terminate the calling process
- exit_group(2)
- exit all threads in a process
- faccessat(2)
- check user's permissions of a file relative to a direc...
- fadvise64(2)
- predeclare an access pattern for file data
- fadvise64_64(2)
- predeclare an access pattern for file data
- fallocate(2)
- manipulate file space
- fattach(2)
- unimplemented system calls
- fchdir(2)
- change working directory
- fchmod(2)
- change permissions of a file
- fchmodat(2)
- change permissions of a file relative to a directory f...
- fchown(2)
- change ownership of a file
- fchown32(2)
- change ownership of a file
- fchownat(2)
- change ownership of a file relative to a directory fil...
- fcntl(2)
- manipulate file descriptor
- fcntl64(2)
- manipulate file descriptor
- fdatasync(2)
- synchronize a file's in-core state with storage device
- fdetach(2)
- unimplemented system calls
- fgetxattr(2)
- retrieve an extended attribute value
- File::FcntlLock(3pm)
- File locking with fcntl(2)
- finit_module(2)
- load a kernel module
- flistxattr(2)
- list extended attribute names
- flock(2)
- apply or remove an advisory lock on an open file
- fork(2)
- create a child process
- free_hugepages(2)
- allocate or free huge pages
- fremovexattr(2)
- remove an extended attribute
- fsetxattr(2)
- set an extended attribute value
- fstat(2)
- get file status
- fstat64(2)
- get file status
- fstatat(2)
- get file status relative to a directory file descriptor
- fstatat64(2)
- get file status relative to a directory file descriptor
- fstatfs(2)
- get filesystem statistics
- fstatfs64(2)
- get filesystem statistics
- fstatvfs(2)
- get filesystem statistics
- fsync(2)
- synchronize a file's in-core state with storage device
- ftruncate(2)
- truncate a file to a specified length
- ftruncate64(2)
- truncate a file to a specified length
- futex(2)
- fast user-space locking
- futimesat(2)
- change timestamps of a file relative to a directory fi...
- get_kernel_syms(2)
- retrieve exported kernel and module symbols
- get_mempolicy(2)
- retrieve NUMA memory policy for a process
- get_robust_list(2)
- get/set list of robust futexes
- get_thread_area(2)
- get a thread-local storage (TLS) area
- getcontext(2)
- get or set the user context
- getcpu(2)
- determine CPU and NUMA node on which the calling threa...
- getcwd(2)
- get current working directory
- getdents(2)
- get directory entries
- getdents64(2)
- get directory entries
- getdomainname(2)
- get/set NIS domain name
- getdtablesize(2)
- get descriptor table size
- getegid(2)
- get group identity
- getegid32(2)
- get group identity
- geteuid(2)
- get user identity
- geteuid32(2)
- get user identity
- getgid(2)
- get group identity
- getgid32(2)
- get group identity
- getgroups(2)
- get/set list of supplementary group IDs
- getgroups32(2)
- get/set list of supplementary group IDs
- gethostid(2)
- get or set the unique identifier of the current host
- gethostname(2)
- get/set hostname
- getitimer(2)
- get or set value of an interval timer
- getmsg(2)
- unimplemented system calls
- getpagesize(2)
- get memory page size
- getpeername(2)
- get name of connected peer socket
- getpgid(2)
- set/get process group
- getpgrp(2)
- set/get process group
- getpid(2)
- get process identification
- getpmsg(2)
- unimplemented system calls
- getppid(2)
- get process identification
- getpriority(2)
- get/set program scheduling priority
- getresgid(2)
- get real, effective and saved user/group IDs
- getresgid32(2)
- get real, effective and saved user/group IDs
- getresuid(2)
- get real, effective and saved user/group IDs
- getresuid32(2)
- get real, effective and saved user/group IDs
- getrlimit(2)
- get/set resource limits
- getrusage(2)
- get resource usage
- getsid(2)
- get session ID
- getsockname(2)
- get socket name
- getsockopt(2)
- get and set options on sockets
- gettid(2)
- get thread identification
- gettimeofday(2)
- get / set time
- getuid(2)
- get user identity
- getuid32(2)
- get user identity
- getunwind(2)
- copy the unwind data to caller's buffer
- getxattr(2)
- retrieve an extended attribute value
- gtty(2)
- unimplemented system calls
- idle(2)
- make process 0 idle
- inb(2)
- port I/O
- inb_p(2)
- port I/O
- init_module(2)
- load a kernel module
- inl(2)
- port I/O
- inl_p(2)
- port I/O
- inotify_add_watch(2)
- add a watch to an initialized inotify instance
- inotify_init(2)
- initialize an inotify instance
- inotify_init1(2)
- initialize an inotify instance
- inotify_rm_watch(2)
- remove an existing watch from an inotify instance
- insb(2)
- port I/O
- insl(2)
- port I/O
- insw(2)
- port I/O
- intro(2)
- introduction to system calls
- inw(2)
- port I/O
- inw_p(2)
- port I/O
- io_cancel(2)
- cancel an outstanding asynchronous I/O operation
- io_destroy(2)
- destroy an asynchronous I/O context
- io_getevents(2)
- read asynchronous I/O events from the completion queue
- io_setup(2)
- create an asynchronous I/O context
- io_submit(2)
- submit asynchronous I/O blocks for processing
- ioctl(2)
- control device
- ioctl_list(2)
- list of ioctl calls in Linux/i386 kernel
- ioperm(2)
- set port input/output permissions
- iopl(2)
- change I/O privilege level
- ioprio_get(2)
- get/set I/O scheduling class and priority
- ioprio_set(2)
- get/set I/O scheduling class and priority
- ipc(2)
- System V IPC system calls
- isastream(2)
- unimplemented system calls
- kcmp(2)
- compare two processes to determine if they share a ker...
- kexec_load(2)
- load a new kernel for later execution
- keyctl(2)
- manipulate the kernel's key management facility
- kill(2)
- send signal to a process
- killpg(2)
- send signal to a process group
- Lchown(3pm)
- use the lchown(2) system call from Perl
- lchown(2)
- change ownership of a file
- lchown32(2)
- change ownership of a file
- lgetxattr(2)
- retrieve an extended attribute value
- link(2)
- make a new name for a file
- linkat(2)
- create a file link relative to directory file descriptors
- listen(2)
- listen for connections on a socket
- listxattr(2)
- list extended attribute names
- llistxattr(2)
- list extended attribute names
- _llseek(2)
- reposition read/write file offset
- llseek(2)
- reposition read/write file offset
- lock(2)
- unimplemented system calls
- lookup_dcookie(2)
- return a directory entry's path
- lremovexattr(2)
- remove an extended attribute
- lseek(2)
- reposition read/write file offset
- lsetxattr(2)
- set an extended attribute value
- lstat(2)
- get file status
- lstat64(2)
- get file status
- madvise(2)
- give advice about use of memory
- madvise1(2)
- unimplemented system calls
- mbind(2)
- set memory policy for a memory range
- migrate_pages(2)
- move all pages in a process to another set of nodes
- mincore(2)
- determine whether pages are resident in memory
- mkdir(2)
- create a directory
- mkdirat(2)
- create a directory relative to a directory file descri...
- mknod(2)
- create a special or ordinary file
- mknodat(2)
- create a special or ordinary file relative to a direct...
- mlock(2)
- lock and unlock memory
- mlockall(2)
- lock and unlock memory
- mmap(2)
- map or unmap files or devices into memory
- mmap2(2)
- map files or devices into memory
- modify_ldt(2)
- get or set ldt
- mount(2)
- mount filesystem
- move_pages(2)
- move individual pages of a process to another node
- mprotect(2)
- set protection on a region of memory
- mpx(2)
- unimplemented system calls
- mq_getsetattr(2)
- get/set message queue attributes
- mq_notify(2)
- register for notification when a message is available
- mq_open(2)
- open a message queue
- mq_timedreceive(2)
- receive a message from a message queue
- mq_timedsend(2)
- send a message to a message queue
- mq_unlink(2)
- remove a message queue
- mremap(2)
- remap a virtual memory address
- msgctl(2)
- System V message control operations
- msgget(2)
- get a System V message queue identifier
- msgop(2)
- System V message queue operations
- msgrcv(2)
- System V message queue operations
- msgsnd(2)
- System V message queue operations
- msync(2)
- synchronize a file with a memory map
- munlock(2)
- lock and unlock memory
- munlockall(2)
- lock and unlock memory
- munmap(2)
- map or unmap files or devices into memory
- nanosleep(2)
- high-resolution sleep
- _newselect(2)
- synchronous I/O multiplexing
- nfsservctl(2)
- syscall interface to kernel nfs daemon
- nice(2)
- change process priority
- oldfstat(2)
- get file status
- oldlstat(2)
- get file status
- oldolduname(2)
- get name and information about current kernel
- oldstat(2)
- get file status
- olduname(2)
- get name and information about current kernel
- open(2)
- open and possibly create a file or device
- openat(2)
- open a file relative to a directory file descriptor
- outb(2)
- port I/O
- outb_p(2)
- port I/O
- outl(2)
- port I/O
- outl_p(2)
- port I/O
- outsb(2)
- port I/O
- outsl(2)
- port I/O
- outsw(2)
- port I/O
- outw(2)
- port I/O
- outw_p(2)
- port I/O
- pause(2)
- wait for signal
- pciconfig_iobase(2)
- pci device information handling
- pciconfig_read(2)
- pci device information handling
- pciconfig_write(2)
- pci device information handling
- perf_event_open(2)
- set up performance monitoring
- perfmonctl(2)
- interface to IA-64 performance monitoring unit
- personality(2)
- set the process execution domain
- phys(2)
- unimplemented system calls
- pipe(2)
- create pipe
- pipe2(2)
- create pipe
- pivot_root(2)
- change the root filesystem
- poll(2)
- wait for some event on a file descriptor
- posix_fadvise(2)
- predeclare an access pattern for file data
- ppoll(2)
- wait for some event on a file descriptor
- prctl(2)
- operations on a process
- pread(2)
- read from or write to a file descriptor at a given offset
- pread64(2)
- read from or write to a file descriptor at a given offset
- preadv(2)
- read or write data into multiple buffers
- prlimit(2)
- get/set resource limits
- process_vm_readv(2)
- transfer data between process address spaces
- process_vm_writev(2)
- transfer data between process address spaces
- prof(2)
- unimplemented system calls
- pselect(2)
- synchronous I/O multiplexing
- pselect6(2)
- synchronous I/O multiplexing
- ptrace(2)
- process trace
- putmsg(2)
- unimplemented system calls
- putpmsg(2)
- unimplemented system calls
- pwrite(2)
- read from or write to a file descriptor at a given offset
- pwrite64(2)
- read from or write to a file descriptor at a given offset
- pwritev(2)
- read or write data into multiple buffers
- quotactl(2)
- manipulate disk quotas
- read(2)
- read from a file descriptor
- readahead(2)
- perform file readahead into page cache
- readdir(2)
- read directory entry
- readlink(2)
- read value of a symbolic link
- readlinkat(2)
- read value of a symbolic link relative to a directory ...
- readv(2)
- read or write data into multiple buffers
- reboot(2)
- reboot or enable/disable Ctrl-Alt-Del
- recv(2)
- receive a message from a socket
- recvfrom(2)
- receive a message from a socket
- recvmmsg(2)
- receive multiple messages on a socket
- recvmsg(2)
- receive a message from a socket
- remap_file_pages(2)
- create a nonlinear file mapping
- removexattr(2)
- remove an extended attribute
- rename(2)
- change the name or location of a file
- renameat(2)
- rename a file relative to directory file descriptors
- request_key(2)
- request a key from the kernel's key management facility
- restart_syscall(2)
- restart a system call after interruption by a stop signal
- rmdir(2)
- delete a directory
- rt_sigaction(2)
- examine and change a signal action
- rt_sigpending(2)
- examine pending signals
- rt_sigprocmask(2)
- examine and change blocked signals
- rt_sigqueueinfo(2)
- queue a signal and data
- rt_sigreturn(2)
- return from signal handler and cleanup stack frame
- rt_sigsuspend(2)
- wait for a signal
- rt_sigtimedwait(2)
- synchronously wait for queued signals
- rt_tgsigqueueinfo(2)
- queue a signal and data
- s390_runtime_instr(2)
- enable/disable s390 CPU run-time instrumentation
- sbrk(2)
- change data segment size
- sched_get_priority_max(2)
- get static priority range
- sched_get_priority_min(2)
- get static priority range
- sched_getaffinity(2)
- set and get a thread's CPU affinity mask
- sched_getparam(2)
- set and get scheduling parameters
- sched_getscheduler(2)
- set and get scheduling policy/parameters
- sched_rr_get_interval(2)
- get the SCHED_RR interval for the named process
- sched_setaffinity(2)
- set and get a thread's CPU affinity mask
- sched_setparam(2)
- set and get scheduling parameters
- sched_setscheduler(2)
- set and get scheduling policy/parameters
- sched_yield(2)
- yield the processor
- security(2)
- unimplemented system calls
- select(2)
- synchronous I/O multiplexing
- select_tut(2)
- synchronous I/O multiplexing
- semctl(2)
- System V semaphore control operations
- semget(2)
- get a System V semaphore set identifier
- semop(2)
- System V semaphore operations
- semtimedop(2)
- System V semaphore operations
- send(2)
- send a message on a socket
- sendfile(2)
- transfer data between file descriptors
- sendfile64(2)
- transfer data between file descriptors
- sendmmsg(2)
- send multiple messages on a socket
- sendmsg(2)
- send a message on a socket
- sendto(2)
- send a message on a socket
- set_robust_list(2)
- get/set list of robust futexes
- set_thread_area(2)
- set a thread local storage (TLS) area
- set_tid_address(2)
- set pointer to thread ID
- setcontext(2)
- get or set the user context
- setdomainname(2)
- get/set NIS domain name
- setegid(2)
- set effective user or group ID
- seteuid(2)
- set effective user or group ID
- setfsgid(2)
- set group identity used for filesystem checks
- setfsgid32(2)
- set group identity used for filesystem checks
- setfsuid(2)
- set user identity used for filesystem checks
- setfsuid32(2)
- set user identity used for filesystem checks
- setgid(2)
- set group identity
- setgid32(2)
- set group identity
- setgroups(2)
- get/set list of supplementary group IDs
- setgroups32(2)
- get/set list of supplementary group IDs
- sethostid(2)
- get or set the unique identifier of the current host
- sethostname(2)
- get/set hostname
- setitimer(2)
- get or set value of an interval timer
- setns(2)
- reassociate thread with a namespace
- setpgid(2)
- set/get process group
- setpgrp(2)
- set/get process group
- setpriority(2)
- get/set program scheduling priority
- setregid(2)
- set real and/or effective user or group ID
- setregid32(2)
- set real and/or effective user or group ID
- setresgid(2)
- set real, effective and saved user or group ID
- setresgid32(2)
- set real, effective and saved user or group ID
- setresuid(2)
- set real, effective and saved user or group ID
- setresuid32(2)
- set real, effective and saved user or group ID
- setreuid(2)
- set real and/or effective user or group ID
- setreuid32(2)
- set real and/or effective user or group ID
- setrlimit(2)
- get/set resource limits
- setsid(2)
- creates a session and sets the process group ID
- setsockopt(2)
- get and set options on sockets
- settimeofday(2)
- get / set time
- setuid(2)
- set user identity
- setuid32(2)
- set user identity
- setup(2)
- setup devices and filesystems, mount root filesystem
- setxattr(2)
- set an extended attribute value
- sgetmask(2)
- manipulation of signal mask (obsolete)
- shmat(2)
- System V shared memory operations
- shmctl(2)
- System V shared memory control
- shmdt(2)
- System V shared memory operations
- shmget(2)
- allocates a System V shared memory segment
- shmop(2)
- System V shared memory operations
- shutdown(2)
- shut down part of a full-duplex connection
- sigaction(2)
- examine and change a signal action
- sigaltstack(2)
- set and/or get signal stack context
- signal(2)
- ANSI C signal handling
- signalfd(2)
- create a file descriptor for accepting signals
- signalfd4(2)
- create a file descriptor for accepting signals
- sigpending(2)
- examine pending signals
- sigprocmask(2)
- examine and change blocked signals
- sigqueue(2)
- queue a signal and data to a process
- sigreturn(2)
- return from signal handler and cleanup stack frame
- sigsuspend(2)
- wait for a signal
- sigtimedwait(2)
- synchronously wait for queued signals
- sigwaitinfo(2)
- synchronously wait for queued signals
- socket(2)
- create an endpoint for communication
- socketcall(2)
- socket system calls
- socketpair(2)
- create a pair of connected sockets
- splice(2)
- splice data to/from a pipe
- spu_create(2)
- create a new spu context
- spu_run(2)
- execute an SPU context
- ssetmask(2)
- manipulation of signal mask (obsolete)
- stat(2)
- get file status
- stat64(2)
- get file status
- statfs(2)
- get filesystem statistics
- statfs64(2)
- get filesystem statistics
- statvfs(2)
- get filesystem statistics
- stime(2)
- set time
- stty(2)
- unimplemented system calls
- subpage_prot(2)
- define a subpage protection for an address range
- swapoff(2)
- start/stop swapping to file/device
- swapon(2)
- start/stop swapping to file/device
- symlink(2)
- make a new name for a file
- symlinkat(2)
- create a symbolic link relative to a directory file de...
- sync(2)
- commit buffer cache to disk
- sync_file_range(2)
- sync a file segment with disk
- sync_file_range2(2)
- sync a file segment with disk
- syncfs(2)
- commit buffer cache to disk
- _syscall(2)
- invoking a system call without library support (OBSOLETE)
- syscall(2)
- indirect system call
- syscalls(2)
- Linux system calls
- _sysctl(2)
- read/write system parameters
- sysctl(2)
- read/write system parameters
- sysfs(2)
- get filesystem type information
- sysinfo(2)
- returns information on overall system statistics
- syslog(2)
- read and/or clear kernel message ring buffer; set cons...
- tee(2)
- duplicating pipe content
- tgkill(2)
- send a signal to a thread
- time(2)
- get time in seconds
- timer_create(2)
- create a POSIX per-process timer
- timer_delete(2)
- delete a POSIX per-process timer
- timer_getoverrun(2)
- get overrun count for a POSIX per-process timer
- timer_gettime(2)
- arm/disarm and fetch state of POSIX per-process timer
- timer_settime(2)
- arm/disarm and fetch state of POSIX per-process timer
- timerfd_create(2)
- timers that notify via file descriptors
- timerfd_gettime(2)
- timers that notify via file descriptors
- timerfd_settime(2)
- timers that notify via file descriptors
- times(2)
- get process times
- tkill(2)
- send a signal to a thread
- truncate(2)
- truncate a file to a specified length
- truncate64(2)
- truncate a file to a specified length
- tuxcall(2)
- unimplemented system calls
- ugetrlimit(2)
- get/set resource limits
- umask(2)
- set file mode creation mask
- umount(2)
- unmount filesystem
- umount2(2)
- unmount filesystem
- uname(2)
- get name and information about current kernel
- unimplemented(2)
- unimplemented system calls
- unlink(2)
- delete a name and possibly the file it refers to
- unlinkat(2)
- remove a directory entry relative to a directory file ...
- unshare(2)
- disassociate parts of the process execution context
- uselib(2)
- load shared library
- ustat(2)
- get filesystem statistics
- utime(2)
- change file last access and modification times
- utimensat(2)
- change file timestamps with nanosecond precision
- utimes(2)
- change file last access and modification times
- vfork(2)
- create a child process and block parent
- vhangup(2)
- virtually hangup the current terminal
- vm86(2)
- enter virtual 8086 mode
- vm86old(2)
- enter virtual 8086 mode
- vmsplice(2)
- splice user pages into a pipe
- vserver(2)
- unimplemented system calls
- wait(2)
- wait for process to change state
- wait3(2)
- wait for process to change state, BSD style
- wait4(2)
- wait for process to change state, BSD style
- waitid(2)
- wait for process to change state
- waitpid(2)
- wait for process to change state
- write(2)
- write to a file descriptor
- writev(2)
- read or write data into multiple buffers
A
B
C
D
E
F
G
I
K
L
M
N
O
P
Q
R
S
T
U
V
W