Supported System Calls

This page is intended to serve as a reference for system call implementation.

Linux has north of 300 system calls. We don't plan on supporting all of them.

Some we will support 100%. Some we will support a little bit. Some will be stubbed out. Others will simply not be implemented. That is this list.

Supported calls:

socket
bind
listen
accept
accept4
connect
sendto
sendmsg
sendmmsg
recvfrom
recvmsg
setsockopt
getsockname
getpeername
getsockopt
shutdown
futex
clone
arch_prctl
set_tid_address
gettid
timerfd_create
timerfd_gettime
timerfd_settime
timer_create
timer_settime
timer_gettime
timer_getoverrun
timer_delete
getitimer
setitimer
alarm
mincore
mmap
mremap
msync
munmap
mprotect
epoll_create
epoll_create1
epoll_ctl
poll
ppoll
select
pselect6
epoll_wait
epoll_pwait
read
pread64
write
pwrite64
open
openat
dup
dup2
dup3
fstat
fallocate
fadvise64
sendfile
stat
lstat
readv
writev
truncate
ftruncate
fdatasync
fsync
sync
syncfs
io_setup
io_submit
io_getevents
io_destroy
access
lseek
fcntl
ioctl
getcwd
symlink
symlinkat
readlink
readlinkat
unlink
unlinkat
rmdir
rename
renameat
renameat2
close
sched_yield
brk
uname
getrlimit
setrlimit
prlimit64
getrusage
getpid
exit_group
exit
getdents
getdents64
mkdir
mkdirat
getrandom
pipe
pipe2
socketpair
eventfd
eventfd2
creat
chdir
fchdir
utime
utimes
newfstatat
sched_getaffinity
sched_setaffinity
capget
prctl
sysinfo
umask
statfs
fstatfs
io_uring_setup
io_uring_enter
io_uring_register
kill
pause
rt_sigaction
rt_sigpending
rt_sigprocmask
rt_sigqueueinfo
rt_tgsigqueueinfo
rt_sigreturn
rt_sigsuspend
rt_sigtimedwait
sigaltstack
signalfd
signalfd4
tgkill
tkill
clock_gettime
clock_nanosleep
gettimeofday
nanosleep
time
times

Unsupported Syscalls:

shmget
shmat
shmctl
fork
vfork
execve
wait4, syscall_ignore);
semget
semop
semctl
shmdt
msgget
msgsnd
msgrcv
msgctl
flock, syscall_ignore);
link
chmod, syscall_ignore);
fchmod, syscall_ignore);
fchown, syscall_ignore);
lchown, syscall_ignore);
ptrace
syslog
getgid, syscall_ignore);
getegid, syscall_ignore);
setpgid
getppid
getpgrp
setsid
setreuid
setregid
getgroups
setresuid
getresuid
setresgid
getresgid
getpgid
setfsuid
setfsgid
getsid
mknod
uselib
personality
ustat
sysfs
getpriority
setpriority
sched_setparam
sched_getparam
sched_setscheduler
sched_getscheduler
sched_get_priority_max
sched_get_priority_min
sched_rr_get_interval
mlock, syscall_ignore);
munlock, syscall_ignore);
mlockall, syscall_ignore);
munlockall, syscall_ignore);
vhangup
modify_ldt
pivot_root
_sysctl
adjtimex
chroot
acct
settimeofday
mount
umount2
swapon
swapoff
reboot
sethostname
setdomainname
iopl
ioperm
create_module
init_module
delete_module
get_kernel_syms
query_module
quotactl
nfsservctl
getpmsg
putpmsg
afs_syscall
tuxcall
security
readahead
setxattr
lsetxattr
fsetxattr
getxattr
lgetxattr
fgetxattr
listxattr
llistxattr
flistxattr
removexattr
lremovexattr
fremovexattr
set_thread_area
io_cancel
get_thread_area
lookup_dcookie
epoll_ctl_old
epoll_wait_old
remap_file_pages
restart_syscall
semtimedop
clock_settime
vserver
mbind
set_mempolicy
get_mempolicy
mq_open
mq_unlink
mq_timedsend
mq_timedreceive
mq_notify
mq_getsetattr
kexec_load
waitid
add_key
request_key
keyctl
ioprio_set
ioprio_get
inotify_init
inotify_add_watch
inotify_rm_watch
migrate_pages
mknodat
fchownat, syscall_ignore);
futimesat
linkat
fchmodat, syscall_ignore);
faccessat
unshare
set_robust_list
get_robust_list
splice
tee
sync_file_range
vmsplice
move_pages
utimensat
inotify_init1
preadv
pwritev
perf_event_open
recvmmsg
fanotify_init
fanotify_mark
name_to_handle_at
open_by_handle_at
clock_adjtime
setns
getcpu
process_vm_readv
process_vm_writev
kcmp
finit_module
sched_setattr
sched_getattr
seccomp
memfd_create
kexec_file_load
bpf
execveat
userfaultfd
membarrier
mlock2, syscall_ignore);
copy_file_range
preadv2
pwritev2
pkey_mprotect
pkey_alloc
pkey_free