Section 2: System Calls

A B C D E F G I K L M N O P Q R S T U V W
Section index

A

accept(2)
accept a connection on a socket
accept4(2)
accept a connection on a socket
access(2)
check 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

B

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

C

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
create_module(2)
create a loadable module entry

D

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

E

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

F

faccessat(2)
check user's permissions for a file
fadvise64(2)
predeclare an access pattern for file data
fadvise64_64(2)
predeclare an access pattern for file data
fallocate(2)
manipulate file space
fanotify_init(2)
create and initialize fanotify group
fanotify_mark(2)
add, remove, or modify an fanotify mark on a filesyste...
fattach(2)
unimplemented system calls
fchdir(2)
change working directory
fchmod(2)
change permissions of a file
fchmodat(2)
change permissions of a file
fchown(2)
change ownership of a file
fchown32(2)
change ownership of a file
fchownat(2)
change ownership of a file
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
ffado-debug(29)
Run FFADO in debug mode
File::FcntlLock(3pm)
File locking with fcntl(2)
File::FcntlLock::Inline(3pm)
File locking with fcntl(2)
File::FcntlLock::Pure(3pm)
File locking with fcntl(2)
File::FcntlLock::XS(3pm)
File locking with fcntl(2)
finit_module(2)
load a kernel module
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
fstat(2)
get file status
fstat64(2)
get file status
fstatat(2)
get file status
fstatat64(2)
get file status
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...

G

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
gtty(2)
unimplemented system calls

I

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

K

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

L

lchown(2)
change ownership of a file
lchown32(2)
change ownership of a file
link(2)
make a new name for a file
linkat(2)
make a new name for a file
listen(2)
listen for connections on a socket
_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
lseek(2)
reposition read/write file offset
lstat(2)
get file status
lstat64(2)
get file status

M

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
mknod(2)
create a special or ordinary file
mknodat(2)
create a special or ordinary file
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

N

name_to_handle_at(2)
obtain handle for a pathname and open file via a handle
nanosleep(2)
high-resolution sleep
_newselect(2)
synchronous I/O multiplexing
nfsservctl(2)
syscall interface to kernel nfs daemon
nice(2)
change process priority

O

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
open_by_handle_at(2)
obtain handle for a pathname and open file via a handle
openat(2)
open and possibly create a file
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

P

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

Q

quotactl(2)
manipulate disk quotas

R

read(2)
read from a file descriptor
readahead(2)
initiate 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
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
rename(2)
change the name or location of a file
renameat(2)
change the name or location of a file
renameat2(2)
change the name or location of a file
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

S

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_getattr(2)
set and get scheduling policy and attributes
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_setattr(2)
set and get scheduling policy and attributes
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
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)
make a new name for a file
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...

T

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

U

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)
delete a name and possibly the file it refers to
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

V

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

W

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