lutfisk.net - syscall table

# Linux system call table for AMD64

Be aware that this API can change, and depending on LibC is usually preferred, however much it sucks.

Includes the first 334 of 439 calls as of 2025-02-09.

Return values are passed in RAX, with values above 0xFFFFFFFFFFFFF000 (unsigned negative 4096) being error codes equivalent to those of LibC's errno after a sign flip by a negq instruction.

Syscall	RAX	RDI	RSI	RDX	R10	R8	R9
read	0	FD	BUF*	SIZE
write	1	FD	BUF*	SIZE
open	2	PATH*	FLAGS	MODE
close	3	FD
stat	4	PATH*	STATBUF*
fstat	5	FD	STATBUF*
lstat	6	PATH*	STATBUF*
poll	7	POLLFD*	COUNT	TIMEOUT
lseek	8	FD	OFFSET	ORIGIN
mmap	9	ADDR*	SIZE	PERMIT	FLAGS	FD	OFFSET
mprotect	10	ADDR*	SIZE	PERMIT
munmap	11	ADDR*	SIZE
brk	12	SIZE
rt_sigaction	13	SIG	ACT*	OACT*	COUNT
rt_sigprocmask	14	HOW	SET*	OSET*	COUNT
rt_sigreturn	15	UNUSED
ioctl	16	FD	CMD	ARG
pread64	17	FD	BUF*	SIZE	OFFSET
pwrite64	18	FD	BUF*	SIZE	OFFSET
readv	19	FD	IOVEC*	COUNT
writev	20	FD	IOVEC*	COUNT
access	21	PATH*	MODE
pipe	22	FD*	MODE
select	23	COUNT	IFDSET*	OFDSET*	EXPFDSET*	TIMEVAL*
sched_yield	24
mremap	25	ADDR*	SIZE	NEWSIZE	FLAGS	NEWADDR*
msync	26	ADDR*	SIZE	FLAGS
mincore	27	ADDR*	SIZE	CHARVEC*
madvise	28	ADDR*	SIZE	BEHAVIOUR
shmget	29	KEY	SIZE	FLAGS
shmat	30	ID	ADDR*	FLAGS
shmctl	31	ID	CMD	BUF*
dup	32	FD
dup2	33	FD	NEWFD
pause	34
nanosleep	35	RQTP*	RMTP*
getitimer	36	WHICH	VAL*
alarm	37	SEC
setitimer	38	WHICH	VAL*	OVAL*
getpid	39
sendfile	40	OFD	IFD	OFFSET*	SIZE
socket	41	FAMILY	TYPE	PROTO
connect	42	FD	SOCKADDR*	ADDRLEN
accept	43	FD	SOCKADDR*	ADDRLEN*
sendto	44	FD	BUF*	SIZE	FLAGS	SOCKADDR*	ADDRLEN
recvfrom	45	FD	BUF*	SIZE	FLAGS	SOCKADDR*	ADDRLEN
sendmsg	46	FD	MSG*	FLAGS
recvmsg	47	FD	MSG*	FLAGS
shutdown	48	FD	HOW
bind	49	FD	SOCKADDR*	ADDRLEN
listen	50	FD	BACKLOG
getsockname	51	FD	SOCKADDR*	ADDRLEN
getpeername	52	FD	SOCKADDR*	ADDRLEN
socketpair	53	FAMILY	TYPE	PROTO	FD*
setsockopt	54	FD	LEVEL	OPT	VAL*	SIZE
getsockopt	55	FD	LEVEL	OPT	VAL*	SIZE*
clone	56	FLAGS	NEWSP	PARENTID*	CHILDID*	TID
fork	57
vfork	58
execve	59	PATH*	ARGV**	ENV**
exit	60	CODE
wait4	61	PID	STATADDR*	OPT	RUSAGE*
kill	62	PID	SIG
uname	63	NAME*
semget	64	KEY	COUNT	FLAGS
semop	65	ID	SEMOPS*	COUNT
semctl	66	ID	COUNT	CMD	ARG
shmdt	67	ADDR*
msgget	68	KEY	FLAGS
msgsnd	69	ID	BUF*	SIZE	FLAGS
msgrcv	70	ID	BUF*	SIZE	TYPE	FLAGS
msgctl	71	ID	CMD	BUF*
fcntl	72	FD	CMD	ARG
flock	73	FD	CMD
fsync	74	FD
fdatasync	75	FD
truncate	76	PATH*	SIZE
ftruncate	77	FD	SIZE
getdents	78	FD	DIRENT*	COUNT
getcwd	79	BUF*	SIZE
chdir	80	PATH*
fchdir	81	FD
rename	82	PATH*	NEWPATH*
mkdir	83	PATH*	MODE
rmdir	84	PATH*
creat	85	PATH*	MODE
link	86	PATH*	NEWPATH*
unlink	87	PATH*
symlink	88	PATH*	NEWPATH*
readlink	89	PATH*	BUF*	SIZE
chmod	90	PATH*	MODE
fchmod	91	FD	MODE
chown	92	PATH*	USRID	GRPID
fchown	93	FD	USRID	GRPID
lchown	94	PATH*	USRID	GRPID
umask	95	MASK
gettimeofday	96	TIMEVAL*	TIMEZONE*
getrlimit	97	RESOURCE	RLIMIT*
getrusage	98	WHO	RUSAGE*
sysinfo	99	SYSINFO*
times	100	TMS*
ptrace	101	REQUEST	PID	ADDR*	DATA*
getuid	102
syslog	103	TYPE	BUF*	SIZE
getgid	104
setuid	105	USRID
setgid	106	GRPID
geteuid	107
getegid	108
setpgid	109	PID	GRPID
getppid	110
getpgrp	111
setsid	112
setreuid	113	RUSRID	EUSRID
setregid	114	RGRPID	EGRPID
getgroups	115	COUNT	GRPID*
setgroups	116	COUNT	GRPID*
setresuid	117	RUSRID*	EUSRID*	SUSRID*
getresuid	118	RUSRID*	EUSRID*	SUSRID*
setresgid	119	RGRPID	EGRPID	SGRPID
getresgid	120	RGRPID*	EGRPID*	SGRPID*
getpgid	121	PID
setfsuid	122	USRID
setfsgid	123	GRPID
getsid	124	PID
capget	125	CAPHEADER	CAPDATAPTR
capset	126	CAPHEADER	CAPDATAPTR
rt_sigpending	127	SIGSET*	COUNT
rt_sigtimedwait	128	SIGSET*	SIGINFO*	TIMESPEC*	COUNT
rt_sigqueueinfo	129	PID	SIG	SIGINFO*
rt_sigsuspend	130	SIGSET*	COUNT
sigaltstack	131	STACK*	OSTACK*
utime	132	PATH*	UTIMBUF*
mknod	133	PATH*	MODE	DEV
uselib	134	--DEPRECATED--
personality	135	PERSONALITY
ustat	136	DEV	USTATBUF*
statfs	137	PATH*	STATFSBUF*
fstatfs	138	FD	STATFSBUF*
sysfs	139	OPT	ARG1	ARG2
getpriority	140	WHICH	WHO
setpriority	141	WHICH	WHO	NICENESS
sched_setparam	142	PID	SCHEDPARAM*
sched_getparam	143	PID	SCHEDPARAM*
sched_setscheduler	144	PID	POLICY	SCHEDPARAM*
sched_getscheduler	145	PID
sched_get_priority_max	146	POLICY
sched_get_priority_min	147	POLICY
sched_rr_get_interval	148	PID	TIMESPEC*
mlock	149	ADDR*	SIZE
munlock	150	ADDR*	SIZE
mlockall	151	FLAGS
munlockall	152
vhangup	153
modify_ldt	154	FUNC	PTR*	BYTES
pivot_root	155	PATH*	OLDPATH*
_sysctl	156	ARGS*
prctl	157	OPT	ARG2	ARG3	ARG4	ARG5
arch_prctl	158	TASK*	CODE	ADDR*
adjtimex	159	TIMEX*
setrlimit	160	RESOURCE	RLIMIT*
chroot	161	PATH*
sync	162
acct	163	PATH*
settimeofday	164	TIMEVAL*	TIMEZONE*
mount	165	DEVPATH*	DIRPATH*	TYPE*	FLAGS	DATA*
umount2	166	PATH*	FLAGS
swapon	167	PATH*	FLAGS
swapoff	168	PATH*
reboot	169	MAGIC1	MAGIC2	CMD	ARG*
sethostname	170	NAME*	SIZE
setdomainname	171	NAME*	SIZE
iopl	172	LEVEL	PTREGS*
ioperm	173	FROM	COUNT	TURN_ON
create_module	174	--REMOVED--
init_module	175	UMOD*	SIZE	UARGS*
delete_module	176	NAME*	FLAGS
get_kernel_syms	177	--REMOVED--
query_module	178	--REMOVED--
quotactl	179	CMD	SPECIAL*	QID	ADDR*
nfsservctl	180	--REMOVED--
getpmsg	180	--REMOVED--
setpmsg	181	--REMOVED--
putpmsg	182	--REMOVED--
afs_syscall	183	--REMOVED--
tucavall	184	--REMOVED--
security	185	--REMOVED--
gettid	186
readahead	187	FD	OFFSET	COUNT
setxattr	188	PATH*	NAME*	VAL*	SIZE	FLAGS
lsetxattr	189	PATH*	NAME*	VAL*	SIZE	FLAGS
fsetxattr	190	FD	NAME*	VAL*	SIZE	FLAGS
getxattr	191	PATH*	NAME*	OVAL*	SIZE
lgetxattr	192	PATH*	NAME*	OVAL*	SIZE
fgetxattr	193	FD	NAME*	OVAL*	SIZE
listxattr	194	PATH*	LIST*	SIZE
llistxattr	195	PATH*	LIST*	SIZE
flistxattr	196	FD	LIST*	SIZE
removexattr	197	PATH*	NAME*
lremovexattr	198	PATH*	NAME*
fremovexattr	199	FD	NAME*
tkill	200	PID	SIG
time	201	TLOC*
futex	202	UADDR*	OP	VAL	UTIME*	UADDR2*	VAL3
sched_setaffinity	203	PID	LEN	UMASK*
sched_getaffinity	204	PID	LEN	UMASK*
set_thread_area	205	UINFO*
io_setup	206	EVENTS	CTX*
io_destroy	207	CTXID
io_getevents	208	CTXID	NMIN	NMAX	OEVENT*
io_submit	209	CTXID	COUNT	IOCB**
io_cancel	210	CTXID	IOCB*	RES*
get_thread_area	211	UINFO*
lookup_dcookie	212	COOKIE	OPATH*	SIZE
epoll_create	213	SIZE
epoll_ctl_old	214	?
epoll_wait_old	215	?
remap_file_pages	216	ADDR*	SIZE	PROT	OFFS	FLAGS
getdents64	217	FD	DIRENT64*	COUNT
set_tid_address	218	TID*
restart_syscall	219
semtimedop	220	SEMID	SEMOPS*	COUNT	TIMESPEC*
fadvise64	221	FD	OFFSET	SIZE	ADVICE	TIMESPEC*
timer_create	222	CLOCKID	EVENTSPEC*	OTIMERID*
timer_settime	223	TIMERID	FLAGS	NEW*	OLD*
timer_gettime	224	TIMERID	SETTING*
timer_getoverrun	225	TIMERID
timer_delete	226	TIMERID
clock_settime	227	CLOCKID	TIMESPEC*
clock_gettime	228	CLOCKID	TIMESPEC*
clock_getres	229	CLOCKID	TIMESPEC*
clock_nanosleep	230	CLOCKID	FLAGS	TIMESPEC*	REMAIN*
exit_group	231	ERRCODE
epoll_wait	232	FD	EVENT*	MAX	TIMEOUT
epoll_ctl	233	FD	OP	FD	EVENT*
tgkill	234	TGID	PID	SIG
utimes	235	PATH*	TIMEVAL*
vserver	236	--NOTIMPL--
mbind	237	ADDR*	SIZE	MODE	NMASK*	MAX	FLAGS
set_mempolicy	238	POLICY	NMASK*	MAX
get_mempolicy	239	OPOLICY*	NMASK*	MAX	ADDR*	FLAGS
mq_open	240	NAME*	FLAGS	MODE	ATTR*
mq_unlink	241	NAME*
mq_timedsend	242	MQD	MSG*	SIZE	PRIORITY	TIMESPEC*
mq_timedreceive	243	MQD	MSG*	SIZE	PRIORITY*	TIMESPEC*
mq_notify	244	MQD	SIGEVENT*
mq_getsetattr	245	MQD	ATTR*	OATTR*
kexec_load	246	ENTRY	COUNT	SEGMENT*	FLAGS
waitid	247	TYPE	PID	SIGINFO*	OPT	RUSAGE*
add_key	248	TYPE*	DESC*	PAYLOAD*	SIZE
request_key	249	TYPE*	DESC*	OCALLOUT*	DSTKEYRING
keyctl	250	OPT	ARG2	ARG3	ARG4	ARG5
ioprio_set	251	WHICH	WHO	PRIORITY
ioprio_get	252	WHICH	WHO
inotify_init	253
inotify_add_watch	254	FD	PATH*	MASK
inotify_rm_watch	255	FD	WD
migrate_pages	256	PID	MAX	OLD*	NEW*
openat	257	FD	PATH*	FLAGS	MODE
mkdirat	258	FD	PATH*	MODE
mknodat	259	FD	PATH*	MODE	DEV
fchownat	260	FD	PATH*	UID	GID	FLAGS
futimesat	261	FD	PATH*	TIMEVAL*
newfstatat	262	FD	PATH*	STATBUF*	FLAGS
unlinkat	263	FD	PATH*	FLAGS
renameat	264	OLDFD	OLDPATH*	NEWFD	NEWPATH*
linkat	265	OLDFD	OLDPATH*	NEWFD	NEWPATH*	FLAGS
symlinkat	266	OLDPATH*	NEWFD	NEWPATH*
readlinkat	267	FD	PATH*	BUF*	SIZE
fchmodat	268	FD	PATH*	MODE
faccessat	269	FD	PATH*	MODE
pselect6	270	COUNT	FDSET*	OFDSET*	EFDSET*	TIMESPEC*	SIGSET*
ppoll	271	POLLFD*	COUNT	TIMESPEC*	SIGSET*	SIZE
unshare	272	FLAGS
set_robust_list	273	HEAD*	LEN
get_robust_list	274	PID	HEAD**	LEN*
splice	275	FDIN	OFFSETIN	FDOUT	OFFSETOUT	SIZE	FLAGS
tee	276	FDIN	FDOUT	SIZE	FLAGS
sync_file_range	277	FD	OFFSET	SIZE	FLAGS
vmsplice	278	FD	IOVEC*	COUNT	FLAGS
move_pages	279	PID	COUNT	ADDR**	NODE*	STATUS*	FLAGS
utimensat	280	FD	PATH*	TIMESPEC*	FLAGS
epoll_pwait	281	FD	EVENT*	MAX	TIMEOUT	SIGSET*	SIZE
signalfd	282	FD	SIGSET*	SIZE
timerfd_create	283	CLOCKID	FLAGS
eventfd	284	COUNT
fallocate	285	FD	MODE	OFFSET	SIZE
timerfd_settime	286	FD	FLAGS	ITIMERSPEC*	OITIMERSPEC*
timerfd_gettime	287	FD	FLAGS	OITIMERSPEC*
accept4	288	FD	OSOCKADDR*	OSIZE*	FLAGS
signalfd4	289	FD	SIGSET*	SIZE	FLAGS
eventfd2	290	COUNT	FLAGS
epoll_create1	291	FLAGS
dup3	292	OLDFD	NEWFD	FLAGS
pipe2	293	OFD*	FLAGS
inotify_init1	294	FLAGS
preadv	295	FD	IOVEC*	COUNT	POSL	POSH
pwritev	296	FD	IOVEC*	COUNT	POSL	POSH
rt_tgsigqueueinfo	297	TGID	PID	SIG	SIGINFO*
perf_event_open	298	ATTR*	PID	CPU	GROUPFD	FLAGS
recvmmsg	299	FD	MSGHDR*	COUNT	FLAGS	TIMESPEC*
fanotify_init	300	FLAGS	EVENTFLAGS
fanotify_mark	301	FD	FLAGS	MASK	DFD	PATH*
prlimit64	302	PID	RESOURCE	NEWRLIMIT64*	OLDRLIMIT64*
name_to_handle_at	303	FD	PATH*	HANDLE*	OMNTID*	FLAGS
open_by_handle_at	304	FD	PATH*	HANDLE*	OMNTID*	FLAGS
clock_adjtime	305	CLOCKID	TIMEX*
syncfs	306	FD
sendmmsg	307	FD	MSGHDR*	COUNT	FLAGS
setns	308	FD	TYPE
getcpu	309	OCPU*	ONODE*	OCACHE*
process_vm_readv	310	PID	LIOVEC*	LCOUNT	RIOVEC*	RCOUNT	FLAGS
process_vm_writev	311	PID	LIOVEC*	LCOUNT	RIOVEC*	RCOUNT	FLAGS
kcmp	312	PID1	PID2	TYPE	IDX1	IDX2
finit_module	313	FD	ARGS*	FLAGS
sched_setattr	314	ATTR*	FLAGS
sched_getattr	315	OATTR*	SIZE	FLAGS
renameat2	316	OLDFD	OLDPATH*	NEWFD	NEWPATH*	FLAGS
seccomp	317	OP	FLAGS	ARGS*
getrandom	318	BUF*	SIZE	FLAGS
memfd_create	319	NAME*	FLAGS
kexec_file_load	320	KERNELFD	INITRDFD	CMDLINESZ	CMDLINE*	FLAGS
bpf	321	CMD	ATTR*	SIZE
execveat	322	FD	PATH*	ARGV**	ENV**	FLAGS
userfaultfd	323	FLAGS
membarrier	324	CMD	FLAGS
mlock2	325	ADDR*	SIZE	FLAGS
copy_file_range	326	FDIN	OFFSETIN	FDOUT	OFFSETOUT	SIZE	FLAGS
preadv2	327	FD	IOVEC*	COUNT	POSL	POSH	FLAGS
pwritev2	328	FD	IOVEC*	COUNT	POSL	POSH	FLAGS
pkey_mprotect	329	ADDR*	SIZE	PROT	PKEY
pkey_alloc	330	FLAGS	ACCESS
pkey_free	331	PKEY
statx	332	FD	PATH*	FLAGS	MASK	STATXBUF*
io_pgetevents	333	?
rseq	334	RSEQ*	SIZE	FLAGS	SIG