syscalls(2) - Linux manual page (original) (raw)
syscalls(2) System Calls Manual syscalls(2)
NAME top
syscalls - Linux system callsSYNOPSIS top
Linux system calls.DESCRIPTION top
The system call is the fundamental interface between an
application and the Linux kernel.System calls and library wrapper functions System calls are generally not invoked directly, but rather via wrapper functions in glibc (or perhaps some other library). For details of direct invocation of a system call, see intro(2). Often, but not always, the name of the wrapper function is the same as the name of the system call that it invokes. For example, glibc contains a function chdir() which invokes the underlying "chdir" system call.
Often the glibc wrapper function is quite thin, doing little work
other than copying arguments to the right registers before
invoking the system call, and then setting _[errno](../man3/errno.3.html)_ appropriately
after the system call has returned. (These are the same steps
that are performed by [syscall(2)](../man2/syscall.2.html), which can be used to invoke
system calls for which no wrapper function is provided.) Note:
system calls indicate a failure by returning a negative error
number to the caller on architectures without a separate error
register/flag, as noted in [syscall(2)](../man2/syscall.2.html); when this happens, the
wrapper function negates the returned error number (to make it
positive), copies it to _[errno](../man3/errno.3.html)_, and returns -1 to the caller of the
wrapper.
Sometimes, however, the wrapper function does some extra work
before invoking the system call. For example, nowadays there are
(for reasons described below) two related system calls,
[truncate(2)](../man2/truncate.2.html) and [truncate64(2)](../man2/truncate64.2.html), and the glibc **truncate**() wrapper
function checks which of those system calls are provided by the
kernel and determines which should be employed.System call list Below is a list of the Linux system calls. In the list, the Kernel column indicates the kernel version for those system calls that were new in Linux 2.2, or have appeared since that kernel version. Note the following points:
• Where no kernel version is indicated, the system call appeared
in Linux 1.0 or earlier.
• Where a system call is marked "1.2" this means the system call
probably appeared in a Linux 1.1.x kernel version, and first
appeared in a stable kernel with 1.2. (Development of the
Linux 1.2 kernel was initiated from a branch of Linux 1.0.6 via
the Linux 1.1.x unstable kernel series.)
• Where a system call is marked "2.0" this means the system call
probably appeared in a Linux 1.3.x kernel version, and first
appeared in a stable kernel with Linux 2.0. (Development of
the Linux 2.0 kernel was initiated from a branch of Linux
1.2.x, somewhere around Linux 1.2.10, via the Linux 1.3.x
unstable kernel series.)
• Where a system call is marked "2.2" this means the system call
probably appeared in a Linux 2.1.x kernel version, and first
appeared in a stable kernel with Linux 2.2.0. (Development of
the Linux 2.2 kernel was initiated from a branch of Linux
2.0.21 via the Linux 2.1.x unstable kernel series.)
• Where a system call is marked "2.4" this means the system call
probably appeared in a Linux 2.3.x kernel version, and first
appeared in a stable kernel with Linux 2.4.0. (Development of
the Linux 2.4 kernel was initiated from a branch of Linux 2.2.8
via the Linux 2.3.x unstable kernel series.)
• Where a system call is marked "2.6" this means the system call
probably appeared in a Linux 2.5.x kernel version, and first
appeared in a stable kernel with Linux 2.6.0. (Development of
Linux 2.6 was initiated from a branch of Linux 2.4.15 via the
Linux 2.5.x unstable kernel series.)
• Starting with Linux 2.6.0, the development model changed, and
new system calls may appear in each Linux 2.6.x release. In
this case, the exact version number where the system call
appeared is shown. This convention continues with the Linux
3.x kernel series, which followed on from Linux 2.6.39; and the
Linux 4.x kernel series, which followed on from Linux 3.19; and
the Linux 5.x kernel series, which followed on from Linux 4.20;
and the Linux 6.x kernel series, which followed on from Linux
5.19.
• In some cases, a system call was added to a stable kernel
series after it branched from the previous stable kernel
series, and then backported into the earlier stable kernel
series. For example some system calls that appeared in Linux
2.6.x were also backported into a Linux 2.4.x release after
Linux 2.4.15. When this is so, the version where the system
call appeared in both of the major kernel series is listed.
The list of system calls that are available as at Linux 5.14 (or
in a few cases only on older kernels) is as follows:
**System call Kernel Notes**
──────────────────────────────────────────────────────────────────────
[_llseek(2)](../man2/%5Fllseek.2.html) 1.2
[_newselect(2)](../man2/%5Fnewselect.2.html) 2.0
[_sysctl(2)](../man2/%5Fsysctl.2.html) 2.0 Removed in 5.5
[accept(2)](../man2/accept.2.html) 2.0 See notes on [socketcall(2)](../man2/socketcall.2.html)
[accept4(2)](../man2/accept4.2.html) 2.6.28
[access(2)](../man2/access.2.html) 1.0
[acct(2)](../man2/acct.2.html) 1.0
[add_key(2)](../man2/add%5Fkey.2.html) 2.6.10
[adjtimex(2)](../man2/adjtimex.2.html) 1.0
[alarm(2)](../man2/alarm.2.html) 1.0
[alloc_hugepages(2)](../man2/alloc%5Fhugepages.2.html) 2.5.36 Removed in 2.5.44
**arc_gettls**(2) 3.9 ARC only
**arc_settls**(2) 3.9 ARC only
**arc_usr_cmpxchg**(2) 4.9 ARC only
[arch_prctl(2)](../man2/arch%5Fprctl.2.html) 2.6 x86_64, x86 since 4.12
**atomic_barrier**(2) 2.6.34 m68k only
**atomic_cmpxchg_32**(2) 2.6.34 m68k only
[bdflush(2)](../man2/bdflush.2.html) 1.2 Deprecated (does nothing)
since 2.6, removed in 5.15
[bind(2)](../man2/bind.2.html) 2.0 See notes on [socketcall(2)](../man2/socketcall.2.html)
[bpf(2)](../man2/bpf.2.html) 3.18
[brk(2)](../man2/brk.2.html) 1.0
**breakpoint**(2) 2.2 ARM OABI only, defined with
**__ARM_NR** prefix
[cacheflush(2)](../man2/cacheflush.2.html) 1.2 Not on x86
[capget(2)](../man2/capget.2.html) 2.2
[capset(2)](../man2/capset.2.html) 2.2
[chdir(2)](../man2/chdir.2.html) 1.0
[chmod(2)](../man2/chmod.2.html) 1.0
[chown(2)](../man2/chown.2.html) 2.2 See [chown(2)](../man2/chown.2.html) for version
details
[chown32(2)](../man2/chown32.2.html) 2.4
[chroot(2)](../man2/chroot.2.html) 1.0
[clock_adjtime(2)](../man2/clock%5Fadjtime.2.html) 2.6.39
[clock_getres(2)](../man2/clock%5Fgetres.2.html) 2.6
[clock_gettime(2)](../man2/clock%5Fgettime.2.html) 2.6
[clock_nanosleep(2)](../man2/clock%5Fnanosleep.2.html) 2.6
[clock_settime(2)](../man2/clock%5Fsettime.2.html) 2.6
[clone2(2)](../man2/clone2.2.html) 2.4 IA-64 only
[clone(2)](../man2/clone.2.html) 1.0
[clone3(2)](../man2/clone3.2.html) 5.3
[close(2)](../man2/close.2.html) 1.0
[close_range(2)](../man2/close%5Frange.2.html) 5.9
[connect(2)](../man2/connect.2.html) 2.0 See notes on [socketcall(2)](../man2/socketcall.2.html)
[copy_file_range(2)](../man2/copy%5Ffile%5Frange.2.html) 4.5
[creat(2)](../man2/creat.2.html) 1.0
[create_module(2)](../man2/create%5Fmodule.2.html) 1.0 Removed in 2.6
[delete_module(2)](../man2/delete%5Fmodule.2.html) 1.0
[dup(2)](../man2/dup.2.html) 1.0
[dup2(2)](../man2/dup2.2.html) 1.0
[dup3(2)](../man2/dup3.2.html) 2.6.27
[epoll_create(2)](../man2/epoll%5Fcreate.2.html) 2.6
[epoll_create1(2)](../man2/epoll%5Fcreate1.2.html) 2.6.27
[epoll_ctl(2)](../man2/epoll%5Fctl.2.html) 2.6
[epoll_pwait(2)](../man2/epoll%5Fpwait.2.html) 2.6.19
[epoll_pwait2(2)](../man2/epoll%5Fpwait2.2.html) 5.11
[epoll_wait(2)](../man2/epoll%5Fwait.2.html) 2.6
[eventfd(2)](../man2/eventfd.2.html) 2.6.22
[eventfd2(2)](../man2/eventfd2.2.html) 2.6.27
**execv**(2) 2.0 SPARC/SPARC64 only, for
compatibility with SunOS
[execve(2)](../man2/execve.2.html) 1.0
[execveat(2)](../man2/execveat.2.html) 3.19
[exit(2)](../man2/exit.2.html) 1.0
[exit_group(2)](../man2/exit%5Fgroup.2.html) 2.6
[faccessat(2)](../man2/faccessat.2.html) 2.6.16
[faccessat2(2)](../man2/faccessat2.2.html) 5.8
[fadvise64(2)](../man2/fadvise64.2.html) 2.6
[fadvise64_64(2)](../man2/fadvise64%5F64.2.html) 2.6
[fallocate(2)](../man2/fallocate.2.html) 2.6.23
[fanotify_init(2)](../man2/fanotify%5Finit.2.html) 2.6.37
[fanotify_mark(2)](../man2/fanotify%5Fmark.2.html) 2.6.37
[fchdir(2)](../man2/fchdir.2.html) 1.0
[fchmod(2)](../man2/fchmod.2.html) 1.0
[fchmodat(2)](../man2/fchmodat.2.html) 2.6.16
[fchown(2)](../man2/fchown.2.html) 1.0
[fchown32(2)](../man2/fchown32.2.html) 2.4
[fchownat(2)](../man2/fchownat.2.html) 2.6.16
[fcntl(2)](../man2/fcntl.2.html) 1.0
[fcntl64(2)](../man2/fcntl64.2.html) 2.4
[fdatasync(2)](../man2/fdatasync.2.html) 2.0
[fgetxattr(2)](../man2/fgetxattr.2.html) 2.6; 2.4.18
[finit_module(2)](../man2/finit%5Fmodule.2.html) 3.8
[flistxattr(2)](../man2/flistxattr.2.html) 2.6; 2.4.18
[flock(2)](../man2/flock.2.html) 2.0
[fork(2)](../man2/fork.2.html) 1.0
[free_hugepages(2)](../man2/free%5Fhugepages.2.html) 2.5.36 Removed in 2.5.44
[fremovexattr(2)](../man2/fremovexattr.2.html) 2.6; 2.4.18
**fsconfig**(2) 5.2
[fsetxattr(2)](../man2/fsetxattr.2.html) 2.6; 2.4.18
**fsmount**(2) 5.2
**fsopen**(2) 5.2
**fspick**(2) 5.2
[fstat(2)](../man2/fstat.2.html) 1.0
[fstat64(2)](../man2/fstat64.2.html) 2.4
[fstatat64(2)](../man2/fstatat64.2.html) 2.6.16
[fstatfs(2)](../man2/fstatfs.2.html) 1.0
[fstatfs64(2)](../man2/fstatfs64.2.html) 2.6
[fsync(2)](../man2/fsync.2.html) 1.0
[ftruncate(2)](../man2/ftruncate.2.html) 1.0
[ftruncate64(2)](../man2/ftruncate64.2.html) 2.4
[futex(2)](../man2/futex.2.html) 2.6
[futimesat(2)](../man2/futimesat.2.html) 2.6.16
[get_kernel_syms(2)](../man2/get%5Fkernel%5Fsyms.2.html) 1.0 Removed in 2.6
[get_mempolicy(2)](../man2/get%5Fmempolicy.2.html) 2.6.6
[get_robust_list(2)](../man2/get%5Frobust%5Flist.2.html) 2.6.17
[get_thread_area(2)](../man2/get%5Fthread%5Farea.2.html) 2.6
**get_tls**(2) 4.15 ARM OABI only, has **__ARM_NR**
prefix
[getcpu(2)](../man2/getcpu.2.html) 2.6.19
[getcwd(2)](../man2/getcwd.2.html) 2.2
[getdents(2)](../man2/getdents.2.html) 2.0
[getdents64(2)](../man2/getdents64.2.html) 2.4
[getdomainname(2)](../man2/getdomainname.2.html) 2.2 SPARC, SPARC64; available
as **osf_getdomainname**(2) on
Alpha since Linux 2.0
**getdtablesize**(2) 2.0 SPARC (removed in 2.6.26),
available on Alpha as
**osf_getdtablesize**(2)
[getegid(2)](../man2/getegid.2.html) 1.0
[getegid32(2)](../man2/getegid32.2.html) 2.4
[geteuid(2)](../man2/geteuid.2.html) 1.0
[geteuid32(2)](../man2/geteuid32.2.html) 2.4
[getgid(2)](../man2/getgid.2.html) 1.0
[getgid32(2)](../man2/getgid32.2.html) 2.4
[getgroups(2)](../man2/getgroups.2.html) 1.0
[getgroups32(2)](../man2/getgroups32.2.html) 2.4
[gethostname(2)](../man2/gethostname.2.html) 2.0 Alpha, was available on
SPARC up to Linux 2.6.26
[getitimer(2)](../man2/getitimer.2.html) 1.0
[getpeername(2)](../man2/getpeername.2.html) 2.0 See notes on [socketcall(2)](../man2/socketcall.2.html)
[getpagesize(2)](../man2/getpagesize.2.html) 2.0 Alpha, SPARC/SPARC64 only
[getpgid(2)](../man2/getpgid.2.html) 1.0
[getpgrp(2)](../man2/getpgrp.2.html) 1.0
[getpid(2)](../man2/getpid.2.html) 1.0
[getppid(2)](../man2/getppid.2.html) 1.0
[getpriority(2)](../man2/getpriority.2.html) 1.0
[getrandom(2)](../man2/getrandom.2.html) 3.17
[getresgid(2)](../man2/getresgid.2.html) 2.2
[getresgid32(2)](../man2/getresgid32.2.html) 2.4
[getresuid(2)](../man2/getresuid.2.html) 2.2
[getresuid32(2)](../man2/getresuid32.2.html) 2.4
[getrlimit(2)](../man2/getrlimit.2.html) 1.0
[getrusage(2)](../man2/getrusage.2.html) 1.0
[getsid(2)](../man2/getsid.2.html) 2.0
[getsockname(2)](../man2/getsockname.2.html) 2.0 See notes on [socketcall(2)](../man2/socketcall.2.html)
[getsockopt(2)](../man2/getsockopt.2.html) 2.0 See notes on [socketcall(2)](../man2/socketcall.2.html)
[gettid(2)](../man2/gettid.2.html) 2.4.11
[gettimeofday(2)](../man2/gettimeofday.2.html) 1.0
[getuid(2)](../man2/getuid.2.html) 1.0
[getuid32(2)](../man2/getuid32.2.html) 2.4
[getunwind(2)](../man2/getunwind.2.html) 2.4.8 IA-64 only; deprecated
[getxattr(2)](../man2/getxattr.2.html) 2.6; 2.4.18
**getxgid**(2) 2.0 Alpha only; see NOTES
**getxpid**(2) 2.0 Alpha only; see NOTES
**getxuid**(2) 2.0 Alpha only; see NOTES
[init_module(2)](../man2/init%5Fmodule.2.html) 1.0
[inotify_add_watch(2)](../man2/inotify%5Fadd%5Fwatch.2.html) 2.6.13
[inotify_init(2)](../man2/inotify%5Finit.2.html) 2.6.13
[inotify_init1(2)](../man2/inotify%5Finit1.2.html) 2.6.27
[inotify_rm_watch(2)](../man2/inotify%5Frm%5Fwatch.2.html) 2.6.13
[io_cancel(2)](../man2/io%5Fcancel.2.html) 2.6
[io_destroy(2)](../man2/io%5Fdestroy.2.html) 2.6
[io_getevents(2)](../man2/io%5Fgetevents.2.html) 2.6
**io_pgetevents**(2) 4.18
[io_setup(2)](../man2/io%5Fsetup.2.html) 2.6
[io_submit(2)](../man2/io%5Fsubmit.2.html) 2.6
[io_uring_enter(2)](../man2/io%5Furing%5Fenter.2.html) 5.1
[io_uring_register(2)](../man2/io%5Furing%5Fregister.2.html) 5.1
[io_uring_setup(2)](../man2/io%5Furing%5Fsetup.2.html) 5.1
[ioctl(2)](../man2/ioctl.2.html) 1.0
[ioperm(2)](../man2/ioperm.2.html) 1.0
[iopl(2)](../man2/iopl.2.html) 1.0
[ioprio_get(2)](../man2/ioprio%5Fget.2.html) 2.6.13
[ioprio_set(2)](../man2/ioprio%5Fset.2.html) 2.6.13
[ipc(2)](../man2/ipc.2.html) 1.0
[kcmp(2)](../man2/kcmp.2.html) 3.5
**kern_features**(2) 3.7 SPARC64 only
[kexec_file_load(2)](../man2/kexec%5Ffile%5Fload.2.html) 3.17
[kexec_load(2)](../man2/kexec%5Fload.2.html) 2.6.13
[keyctl(2)](../man2/keyctl.2.html) 2.6.10
[kill(2)](../man2/kill.2.html) 1.0
[landlock_add_rule(2)](../man2/landlock%5Fadd%5Frule.2.html) 5.13
[landlock_create_ruleset(2)](../man2/landlock%5Fcreate%5Fruleset.2.html) 5.13
[landlock_restrict_self(2)](../man2/landlock%5Frestrict%5Fself.2.html) 5.13
[lchown(2)](../man2/lchown.2.html) 1.0 See [chown(2)](../man2/chown.2.html) for version
details
[lchown32(2)](../man2/lchown32.2.html) 2.4
[lgetxattr(2)](../man2/lgetxattr.2.html) 2.6; 2.4.18
[link(2)](../man2/link.2.html) 1.0
[linkat(2)](../man2/linkat.2.html) 2.6.16
[listen(2)](../man2/listen.2.html) 2.0 See notes on [socketcall(2)](../man2/socketcall.2.html)
[listxattr(2)](../man2/listxattr.2.html) 2.6; 2.4.18
[llistxattr(2)](../man2/llistxattr.2.html) 2.6; 2.4.18
[lookup_dcookie(2)](../man2/lookup%5Fdcookie.2.html) 2.6
[lremovexattr(2)](../man2/lremovexattr.2.html) 2.6; 2.4.18
[lseek(2)](../man2/lseek.2.html) 1.0
[lsetxattr(2)](../man2/lsetxattr.2.html) 2.6; 2.4.18
[lstat(2)](../man2/lstat.2.html) 1.0
[lstat64(2)](../man2/lstat64.2.html) 2.4
[madvise(2)](../man2/madvise.2.html) 2.4
[mbind(2)](../man2/mbind.2.html) 2.6.6
**memory_ordering**(2) 2.2 SPARC64 only
[membarrier(2)](../man2/membarrier.2.html) 3.17
[memfd_create(2)](../man2/memfd%5Fcreate.2.html) 3.17
[memfd_secret(2)](../man2/memfd%5Fsecret.2.html) 5.14
[migrate_pages(2)](../man2/migrate%5Fpages.2.html) 2.6.16
[mincore(2)](../man2/mincore.2.html) 2.4
[mkdir(2)](../man2/mkdir.2.html) 1.0
[mkdirat(2)](../man2/mkdirat.2.html) 2.6.16
[mknod(2)](../man2/mknod.2.html) 1.0
[mknodat(2)](../man2/mknodat.2.html) 2.6.16
[mlock(2)](../man2/mlock.2.html) 2.0
[mlock2(2)](../man2/mlock2.2.html) 4.4
[mlockall(2)](../man2/mlockall.2.html) 2.0
[mmap(2)](../man2/mmap.2.html) 1.0
[mmap2(2)](../man2/mmap2.2.html) 2.4
[modify_ldt(2)](../man2/modify%5Fldt.2.html) 1.0
[mount(2)](../man2/mount.2.html) 1.0
**move_mount**(2) 5.2
[move_pages(2)](../man2/move%5Fpages.2.html) 2.6.18
[mprotect(2)](../man2/mprotect.2.html) 1.0
[mq_getsetattr(2)](../man2/mq%5Fgetsetattr.2.html) 2.6.6
[mq_notify(2)](../man2/mq%5Fnotify.2.html) 2.6.6
[mq_open(2)](../man2/mq%5Fopen.2.html) 2.6.6
[mq_timedreceive(2)](../man2/mq%5Ftimedreceive.2.html) 2.6.6
[mq_timedsend(2)](../man2/mq%5Ftimedsend.2.html) 2.6.6
[mq_unlink(2)](../man2/mq%5Funlink.2.html) 2.6.6
[mremap(2)](../man2/mremap.2.html) 2.0
[msgctl(2)](../man2/msgctl.2.html) 2.0 See notes on [ipc(2)](../man2/ipc.2.html)
[msgget(2)](../man2/msgget.2.html) 2.0 See notes on [ipc(2)](../man2/ipc.2.html)
[msgrcv(2)](../man2/msgrcv.2.html) 2.0 See notes on [ipc(2)](../man2/ipc.2.html)
[msgsnd(2)](../man2/msgsnd.2.html) 2.0 See notes on [ipc(2)](../man2/ipc.2.html)
[msync(2)](../man2/msync.2.html) 2.0
[munlock(2)](../man2/munlock.2.html) 2.0
[munlockall(2)](../man2/munlockall.2.html) 2.0
[munmap(2)](../man2/munmap.2.html) 1.0
[name_to_handle_at(2)](../man2/name%5Fto%5Fhandle%5Fat.2.html) 2.6.39
[nanosleep(2)](../man2/nanosleep.2.html) 2.0
[newfstatat(2)](../man2/newfstatat.2.html) 2.6.16 See [stat(2)](../man2/stat.2.html)
[nfsservctl(2)](../man2/nfsservctl.2.html) 2.2 Removed in 3.1
[nice(2)](../man2/nice.2.html) 1.0
**old_adjtimex**(2) 2.0 Alpha only; see NOTES
**old_getrlimit**(2) 2.4 Old variant of [getrlimit(2)](../man2/getrlimit.2.html)
that used a different value
for **RLIM_INFINITY**
[oldfstat(2)](../man2/oldfstat.2.html) 1.0
[oldlstat(2)](../man2/oldlstat.2.html) 1.0
[oldolduname(2)](../man2/oldolduname.2.html) 1.0
[oldstat(2)](../man2/oldstat.2.html) 1.0
**oldumount**(2) 2.4.116 Name of the old [umount(2)](../man2/umount.2.html)
syscall on Alpha
[olduname(2)](../man2/olduname.2.html) 1.0
[open(2)](../man2/open.2.html) 1.0
[open_by_handle_at(2)](../man2/open%5Fby%5Fhandle%5Fat.2.html) 2.6.39
**open_tree**(2) 5.2
[openat(2)](../man2/openat.2.html) 2.6.16
[openat2(2)](../man2/openat2.2.html) 5.6
**or1k_atomic**(2) 3.1 OpenRISC 1000 only
[pause(2)](../man2/pause.2.html) 1.0
[pciconfig_iobase(2)](../man2/pciconfig%5Fiobase.2.html) 2.2.15; 2.4 Not on x86
[pciconfig_read(2)](../man2/pciconfig%5Fread.2.html) 2.0.26; 2.2 Not on x86
[pciconfig_write(2)](../man2/pciconfig%5Fwrite.2.html) 2.0.26; 2.2 Not on x86
[perf_event_open(2)](../man2/perf%5Fevent%5Fopen.2.html) 2.6.31 Was perf_counter_open() in
2.6.31; renamed in 2.6.32
[personality(2)](../man2/personality.2.html) 1.2
**perfctr**(2) 2.2 SPARC only; removed in
2.6.34
[perfmonctl(2)](../man2/perfmonctl.2.html) 2.4 IA-64 only; removed in 5.10
[pidfd_getfd(2)](../man2/pidfd%5Fgetfd.2.html) 5.6
[pidfd_send_signal(2)](../man2/pidfd%5Fsend%5Fsignal.2.html) 5.1
[pidfd_open(2)](../man2/pidfd%5Fopen.2.html) 5.3
[pipe(2)](../man2/pipe.2.html) 1.0
[pipe2(2)](../man2/pipe2.2.html) 2.6.27
[pivot_root(2)](../man2/pivot%5Froot.2.html) 2.4
[pkey_alloc(2)](../man2/pkey%5Falloc.2.html) 4.8
[pkey_free(2)](../man2/pkey%5Ffree.2.html) 4.8
[pkey_mprotect(2)](../man2/pkey%5Fmprotect.2.html) 4.8
[poll(2)](../man2/poll.2.html) 2.0.36; 2.2
[ppoll(2)](../man2/ppoll.2.html) 2.6.16
[prctl(2)](../man2/prctl.2.html) 2.2
[pread64(2)](../man2/pread64.2.html) Added as "pread" in 2.2;
renamed "pread64" in 2.6
[preadv(2)](../man2/preadv.2.html) 2.6.30
[preadv2(2)](../man2/preadv2.2.html) 4.6
[prlimit64(2)](../man2/prlimit64.2.html) 2.6.36
[process_madvise(2)](../man2/process%5Fmadvise.2.html) 5.10
[process_vm_readv(2)](../man2/process%5Fvm%5Freadv.2.html) 3.2
[process_vm_writev(2)](../man2/process%5Fvm%5Fwritev.2.html) 3.2
[pselect6(2)](../man2/pselect6.2.html) 2.6.16
[ptrace(2)](../man2/ptrace.2.html) 1.0
[pwrite64(2)](../man2/pwrite64.2.html) Added as "pwrite" in 2.2;
renamed "pwrite64" in 2.6
[pwritev(2)](../man2/pwritev.2.html) 2.6.30
[pwritev2(2)](../man2/pwritev2.2.html) 4.6
[query_module(2)](../man2/query%5Fmodule.2.html) 2.2 Removed in 2.6
[quotactl(2)](../man2/quotactl.2.html) 1.0
**quotactl_fd**(2) 5.14
[read(2)](../man2/read.2.html) 1.0
[readahead(2)](../man2/readahead.2.html) 2.4.13
[readdir(2)](../man2/readdir.2.html) 1.0
[readlink(2)](../man2/readlink.2.html) 1.0
[readlinkat(2)](../man2/readlinkat.2.html) 2.6.16
[readv(2)](../man2/readv.2.html) 2.0
[reboot(2)](../man2/reboot.2.html) 1.0
[recv(2)](../man2/recv.2.html) 2.0 See notes on [socketcall(2)](../man2/socketcall.2.html)
[recvfrom(2)](../man2/recvfrom.2.html) 2.0 See notes on [socketcall(2)](../man2/socketcall.2.html)
[recvmsg(2)](../man2/recvmsg.2.html) 2.0 See notes on [socketcall(2)](../man2/socketcall.2.html)
[recvmmsg(2)](../man2/recvmmsg.2.html) 2.6.33
[remap_file_pages(2)](../man2/remap%5Ffile%5Fpages.2.html) 2.6 Deprecated since 3.16
[removexattr(2)](../man2/removexattr.2.html) 2.6; 2.4.18
[rename(2)](../man2/rename.2.html) 1.0
[renameat(2)](../man2/renameat.2.html) 2.6.16
[renameat2(2)](../man2/renameat2.2.html) 3.15
[request_key(2)](../man2/request%5Fkey.2.html) 2.6.10
[restart_syscall(2)](../man2/restart%5Fsyscall.2.html) 2.6
[riscv_flush_icache(2)](../man2/riscv%5Fflush%5Ficache.2.html) 4.15 RISC-V only
[rmdir(2)](../man2/rmdir.2.html) 1.0
**rseq**(2) 4.18
[rt_sigaction(2)](../man2/rt%5Fsigaction.2.html) 2.2
[rt_sigpending(2)](../man2/rt%5Fsigpending.2.html) 2.2
[rt_sigprocmask(2)](../man2/rt%5Fsigprocmask.2.html) 2.2
[rt_sigqueueinfo(2)](../man2/rt%5Fsigqueueinfo.2.html) 2.2
[rt_sigreturn(2)](../man2/rt%5Fsigreturn.2.html) 2.2
[rt_sigsuspend(2)](../man2/rt%5Fsigsuspend.2.html) 2.2
[rt_sigtimedwait(2)](../man2/rt%5Fsigtimedwait.2.html) 2.2
[rt_tgsigqueueinfo(2)](../man2/rt%5Ftgsigqueueinfo.2.html) 2.6.31
**rtas**(2) 2.6.2 PowerPC/PowerPC64 only
[s390_runtime_instr(2)](../man2/s390%5Fruntime%5Finstr.2.html) 3.7 s390 only
[s390_pci_mmio_read(2)](../man2/s390%5Fpci%5Fmmio%5Fread.2.html) 3.19 s390 only
[s390_pci_mmio_write(2)](../man2/s390%5Fpci%5Fmmio%5Fwrite.2.html) 3.19 s390 only
[s390_sthyi(2)](../man2/s390%5Fsthyi.2.html) 4.15 s390 only
[s390_guarded_storage(2)](../man2/s390%5Fguarded%5Fstorage.2.html) 4.12 s390 only
**sched_get_affinity**(2) 2.6 Name of
[sched_getaffinity(2)](../man2/sched%5Fgetaffinity.2.html) on
SPARC and SPARC64
[sched_get_priority_max(2)](../man2/sched%5Fget%5Fpriority%5Fmax.2.html) 2.0
[sched_get_priority_min(2)](../man2/sched%5Fget%5Fpriority%5Fmin.2.html) 2.0
[sched_getaffinity(2)](../man2/sched%5Fgetaffinity.2.html) 2.6
[sched_getattr(2)](../man2/sched%5Fgetattr.2.html) 3.14
[sched_getparam(2)](../man2/sched%5Fgetparam.2.html) 2.0
[sched_getscheduler(2)](../man2/sched%5Fgetscheduler.2.html) 2.0
[sched_rr_get_interval(2)](../man2/sched%5Frr%5Fget%5Finterval.2.html) 2.0
**sched_set_affinity**(2) 2.6 Name of
[sched_setaffinity(2)](../man2/sched%5Fsetaffinity.2.html) on
SPARC and SPARC64
[sched_setaffinity(2)](../man2/sched%5Fsetaffinity.2.html) 2.6
[sched_setattr(2)](../man2/sched%5Fsetattr.2.html) 3.14
[sched_setparam(2)](../man2/sched%5Fsetparam.2.html) 2.0
[sched_setscheduler(2)](../man2/sched%5Fsetscheduler.2.html) 2.0
[sched_yield(2)](../man2/sched%5Fyield.2.html) 2.0
[seccomp(2)](../man2/seccomp.2.html) 3.17
[select(2)](../man2/select.2.html) 1.0
[semctl(2)](../man2/semctl.2.html) 2.0 See notes on [ipc(2)](../man2/ipc.2.html)
[semget(2)](../man2/semget.2.html) 2.0 See notes on [ipc(2)](../man2/ipc.2.html)
[semop(2)](../man2/semop.2.html) 2.0 See notes on [ipc(2)](../man2/ipc.2.html)
[semtimedop(2)](../man2/semtimedop.2.html) 2.6; 2.4.22
[send(2)](../man2/send.2.html) 2.0 See notes on [socketcall(2)](../man2/socketcall.2.html)
[sendfile(2)](../man2/sendfile.2.html) 2.2
[sendfile64(2)](../man2/sendfile64.2.html) 2.6; 2.4.19
[sendmmsg(2)](../man2/sendmmsg.2.html) 3.0
[sendmsg(2)](../man2/sendmsg.2.html) 2.0 See notes on [socketcall(2)](../man2/socketcall.2.html)
[sendto(2)](../man2/sendto.2.html) 2.0 See notes on [socketcall(2)](../man2/socketcall.2.html)
[set_mempolicy(2)](../man2/set%5Fmempolicy.2.html) 2.6.6
[set_robust_list(2)](../man2/set%5Frobust%5Flist.2.html) 2.6.17
[set_thread_area(2)](../man2/set%5Fthread%5Farea.2.html) 2.6
[set_tid_address(2)](../man2/set%5Ftid%5Faddress.2.html) 2.6
**set_tls**(2) 2.6.11 ARM OABI/EABI only
(constant has **__ARM_NR**
prefix)
[setdomainname(2)](../man2/setdomainname.2.html) 1.0
[setfsgid(2)](../man2/setfsgid.2.html) 1.2
[setfsgid32(2)](../man2/setfsgid32.2.html) 2.4
[setfsuid(2)](../man2/setfsuid.2.html) 1.2
[setfsuid32(2)](../man2/setfsuid32.2.html) 2.4
[setgid(2)](../man2/setgid.2.html) 1.0
[setgid32(2)](../man2/setgid32.2.html) 2.4
[setgroups(2)](../man2/setgroups.2.html) 1.0
[setgroups32(2)](../man2/setgroups32.2.html) 2.4
**sethae**(2) 2.0 Alpha only; see NOTES
[sethostname(2)](../man2/sethostname.2.html) 1.0
[setitimer(2)](../man2/setitimer.2.html) 1.0
[setns(2)](../man2/setns.2.html) 3.0
[setpgid(2)](../man2/setpgid.2.html) 1.0
[setpgrp(2)](../man2/setpgrp.2.html) 2.0 Alternative name for
[setpgid(2)](../man2/setpgid.2.html) on Alpha
[setpriority(2)](../man2/setpriority.2.html) 1.0
[setregid(2)](../man2/setregid.2.html) 1.0
[setregid32(2)](../man2/setregid32.2.html) 2.4
[setresgid(2)](../man2/setresgid.2.html) 2.2
[setresgid32(2)](../man2/setresgid32.2.html) 2.4
[setresuid(2)](../man2/setresuid.2.html) 2.2
[setresuid32(2)](../man2/setresuid32.2.html) 2.4
[setreuid(2)](../man2/setreuid.2.html) 1.0
[setreuid32(2)](../man2/setreuid32.2.html) 2.4
[setrlimit(2)](../man2/setrlimit.2.html) 1.0
[setsid(2)](../man2/setsid.2.html) 1.0
[setsockopt(2)](../man2/setsockopt.2.html) 2.0 See notes on [socketcall(2)](../man2/socketcall.2.html)
[settimeofday(2)](../man2/settimeofday.2.html) 1.0
[setuid(2)](../man2/setuid.2.html) 1.0
[setuid32(2)](../man2/setuid32.2.html) 2.4
[setup(2)](../man2/setup.2.html) 1.0 Removed in 2.2
[setxattr(2)](../man2/setxattr.2.html) 2.6; 2.4.18
[sgetmask(2)](../man2/sgetmask.2.html) 1.0
[shmat(2)](../man2/shmat.2.html) 2.0 See notes on [ipc(2)](../man2/ipc.2.html)
[shmctl(2)](../man2/shmctl.2.html) 2.0 See notes on [ipc(2)](../man2/ipc.2.html)
[shmdt(2)](../man2/shmdt.2.html) 2.0 See notes on [ipc(2)](../man2/ipc.2.html)
[shmget(2)](../man2/shmget.2.html) 2.0 See notes on [ipc(2)](../man2/ipc.2.html)
[shutdown(2)](../man2/shutdown.2.html) 2.0 See notes on [socketcall(2)](../man2/socketcall.2.html)
[sigaction(2)](../man2/sigaction.2.html) 1.0
[sigaltstack(2)](../man2/sigaltstack.2.html) 2.2
[signal(2)](../man2/signal.2.html) 1.0
[signalfd(2)](../man2/signalfd.2.html) 2.6.22
[signalfd4(2)](../man2/signalfd4.2.html) 2.6.27
[sigpending(2)](../man2/sigpending.2.html) 1.0
[sigprocmask(2)](../man2/sigprocmask.2.html) 1.0
[sigreturn(2)](../man2/sigreturn.2.html) 1.0
[sigsuspend(2)](../man2/sigsuspend.2.html) 1.0
[socket(2)](../man2/socket.2.html) 2.0 See notes on [socketcall(2)](../man2/socketcall.2.html)
[socketcall(2)](../man2/socketcall.2.html) 1.0
[socketpair(2)](../man2/socketpair.2.html) 2.0 See notes on [socketcall(2)](../man2/socketcall.2.html)
**spill**(2) 2.6.13 Xtensa only
[splice(2)](../man2/splice.2.html) 2.6.17
[spu_create(2)](../man2/spu%5Fcreate.2.html) 2.6.16 PowerPC/PowerPC64 only
[spu_run(2)](../man2/spu%5Frun.2.html) 2.6.16 PowerPC/PowerPC64 only
[ssetmask(2)](../man2/ssetmask.2.html) 1.0
[stat(2)](../man2/stat.2.html) 1.0
[stat64(2)](../man2/stat64.2.html) 2.4
[statfs(2)](../man2/statfs.2.html) 1.0
[statfs64(2)](../man2/statfs64.2.html) 2.6
[statx(2)](../man2/statx.2.html) 4.11
[stime(2)](../man2/stime.2.html) 1.0
[subpage_prot(2)](../man2/subpage%5Fprot.2.html) 2.6.25 PowerPC/PowerPC64 only
**swapcontext**(2) 2.6.3 PowerPC/PowerPC64 only
**switch_endian**(2) 4.1 PowerPC64 only
[swapoff(2)](../man2/swapoff.2.html) 1.0
[swapon(2)](../man2/swapon.2.html) 1.0
[symlink(2)](../man2/symlink.2.html) 1.0
[symlinkat(2)](../man2/symlinkat.2.html) 2.6.16
[sync(2)](../man2/sync.2.html) 1.0
[sync_file_range(2)](../man2/sync%5Ffile%5Frange.2.html) 2.6.17
[sync_file_range2(2)](../man2/sync%5Ffile%5Frange2.2.html) 2.6.22
[syncfs(2)](../man2/syncfs.2.html) 2.6.39
**sys_debug_setcontext**(2) 2.6.11 PowerPC only
[syscall(2)](../man2/syscall.2.html) 1.0 Still available on ARM OABI
and MIPS O32 ABI
[sysfs(2)](../man2/sysfs.2.html) 1.2
[sysinfo(2)](../man2/sysinfo.2.html) 1.0
[syslog(2)](../man2/syslog.2.html) 1.0
**sysmips**(2) 2.6.0 MIPS only
[tee(2)](../man2/tee.2.html) 2.6.17
[tgkill(2)](../man2/tgkill.2.html) 2.6
[time(2)](../man2/time.2.html) 1.0
[timer_create(2)](../man2/timer%5Fcreate.2.html) 2.6
[timer_delete(2)](../man2/timer%5Fdelete.2.html) 2.6
[timer_getoverrun(2)](../man2/timer%5Fgetoverrun.2.html) 2.6
[timer_gettime(2)](../man2/timer%5Fgettime.2.html) 2.6
[timer_settime(2)](../man2/timer%5Fsettime.2.html) 2.6
[timerfd_create(2)](../man2/timerfd%5Fcreate.2.html) 2.6.25
[timerfd_gettime(2)](../man2/timerfd%5Fgettime.2.html) 2.6.25
[timerfd_settime(2)](../man2/timerfd%5Fsettime.2.html) 2.6.25
[times(2)](../man2/times.2.html) 1.0
[tkill(2)](../man2/tkill.2.html) 2.6; 2.4.22
[truncate(2)](../man2/truncate.2.html) 1.0
[truncate64(2)](../man2/truncate64.2.html) 2.4
[ugetrlimit(2)](../man2/ugetrlimit.2.html) 2.4
[umask(2)](../man2/umask.2.html) 1.0
[umount(2)](../man2/umount.2.html) 1.0
[umount2(2)](../man2/umount2.2.html) 2.2
[uname(2)](../man2/uname.2.html) 1.0
[unlink(2)](../man2/unlink.2.html) 1.0
[unlinkat(2)](../man2/unlinkat.2.html) 2.6.16
[unshare(2)](../man2/unshare.2.html) 2.6.16
[uselib(2)](../man2/uselib.2.html) 1.0
[ustat(2)](../man2/ustat.2.html) 1.0
[userfaultfd(2)](../man2/userfaultfd.2.html) 4.3
**usr26**(2) 2.4.8.1 ARM OABI only
**usr32**(2) 2.4.8.1 ARM OABI only
[utime(2)](../man2/utime.2.html) 1.0
[utimensat(2)](../man2/utimensat.2.html) 2.6.22
[utimes(2)](../man2/utimes.2.html) 2.2
**utrap_install**(2) 2.2 SPARC64 only
[vfork(2)](../man2/vfork.2.html) 2.2
[vhangup(2)](../man2/vhangup.2.html) 1.0
[vm86old(2)](../man2/vm86old.2.html) 1.0 Was "vm86"; renamed in
2.0.28/2.2
[vm86(2)](../man2/vm86.2.html) 2.0.28; 2.2
[vmsplice(2)](../man2/vmsplice.2.html) 2.6.17
[wait4(2)](../man2/wait4.2.html) 1.0
[waitid(2)](../man2/waitid.2.html) 2.6.10
[waitpid(2)](../man2/waitpid.2.html) 1.0
[write(2)](../man2/write.2.html) 1.0
[writev(2)](../man2/writev.2.html) 2.0
**xtensa**(2) 2.6.13 Xtensa only
On many platforms, including x86-32, socket calls are all
multiplexed (via glibc wrapper functions) through [socketcall(2)](../man2/socketcall.2.html)
and similarly System V IPC calls are multiplexed through [ipc(2)](../man2/ipc.2.html).
Although slots are reserved for them in the system call table, the
following system calls are not implemented in the standard kernel:
[afs_syscall(2)](../man2/afs%5Fsyscall.2.html), [break(2)](../man2/break.2.html), **ftime**(2), [getpmsg(2)](../man2/getpmsg.2.html), [gtty(2)](../man2/gtty.2.html), [idle(2)](../man2/idle.2.html),
[lock(2)](../man2/lock.2.html), [madvise1(2)](../man2/madvise1.2.html), [mpx(2)](../man2/mpx.2.html), [phys(2)](../man2/phys.2.html), [prof(2)](../man2/prof.2.html), **profil**(2),
[putpmsg(2)](../man2/putpmsg.2.html), [security(2)](../man2/security.2.html), [stty(2)](../man2/stty.2.html), [tuxcall(2)](../man2/tuxcall.2.html), **ulimit**(2), and
[vserver(2)](../man2/vserver.2.html) (see also [unimplemented(2)](../man2/unimplemented.2.html)). However, [ftime(3)](../man3/ftime.3.html),
[profil(3)](../man3/profil.3.html), and [ulimit(3)](../man3/ulimit.3.html) exist as library routines. The slot for
[phys(2)](../man2/phys.2.html) is in use since Linux 2.1.116 for [umount(2)](../man2/umount.2.html); [phys(2)](../man2/phys.2.html) will
never be implemented. The [getpmsg(2)](../man2/getpmsg.2.html) and [putpmsg(2)](../man2/putpmsg.2.html) calls are for
kernels patched to support STREAMS, and may never be in the
standard kernel.
There was briefly **set_zone_reclaim**(2), added in Linux 2.6.13, and
removed in Linux 2.6.16; this system call was never available to
user space.System calls on removed ports Some system calls only ever existed on Linux architectures that have since been removed from the kernel:
AVR32 (port removed in Linux 4.12)
• [pread(2)](../man2/pread.2.html)
• [pwrite(2)](../man2/pwrite.2.html)
Blackfin (port removed in Linux 4.17)
• **bfin_spinlock**(2) (added in Linux 2.6.22)
• **dma_memcpy**(2) (added in Linux 2.6.22)
• [pread(2)](../man2/pread.2.html) (added in Linux 2.6.22)
• [pwrite(2)](../man2/pwrite.2.html) (added in Linux 2.6.22)
• **sram_alloc**(2) (added in Linux 2.6.22)
• **sram_free**(2) (added in Linux 2.6.22)
Metag (port removed in Linux 4.17)
• **metag_get_tls**(2) (add in Linux 3.9)
• **metag_set_fpu_flags**(2) (add in Linux 3.9)
• **metag_set_tls**(2) (add in Linux 3.9)
• **metag_setglobalbit**(2) (add in Linux 3.9)
Tile (port removed in Linux 4.17)
• **cmpxchg_badaddr**(2) (added in Linux 2.6.36)NOTES top
Roughly speaking, the code belonging to the system call with
number __NR_xxx defined in _/usr/include/asm/unistd.h_ can be found
in the Linux kernel source in the routine _sysxxx_(). There are
many exceptions, however, mostly because older system calls were
superseded by newer ones, and this has been treated somewhat
unsystematically. On platforms with proprietary operating-system
emulation, such as sparc, sparc64, and alpha, there are many
additional system calls; mips64 also contains a full set of 32-bit
system calls.
Over time, changes to the interfaces of some system calls have
been necessary. One reason for such changes was the need to
increase the size of structures or scalar values passed to the
system call. Because of these changes, certain architectures
(notably, longstanding 32-bit architectures such as i386) now have
various groups of related system calls (e.g., [truncate(2)](../man2/truncate.2.html) and
[truncate64(2)](../man2/truncate64.2.html)) which perform similar tasks, but which vary in
details such as the size of their arguments. (As noted earlier,
applications are generally unaware of this: the glibc wrapper
functions do some work to ensure that the right system call is
invoked, and that ABI compatibility is preserved for old
binaries.) Examples of system calls that exist in multiple
versions are the following:
• By now there are three different versions of [stat(2)](../man2/stat.2.html):
_sysstat_() (slot __NRoldstat_), _sysnewstat_() (slot __NRstat_),
and _sysstat64_() (slot __NRstat64_), with the last being the
most current. A similar story applies for [lstat(2)](../man2/lstat.2.html) and
[fstat(2)](../man2/fstat.2.html).
• Similarly, the defines __NRoldolduname_, __NRolduname_, and
__NRuname_ refer to the routines _sysolduname_(), _sysuname_(),
and _sysnewuname_().
• In Linux 2.0, a new version of [vm86(2)](../man2/vm86.2.html) appeared, with the old
and the new kernel routines being named _sysvm86old_() and
_sysvm86_().
• In Linux 2.4, a new version of [getrlimit(2)](../man2/getrlimit.2.html) appeared, with the
old and the new kernel routines being named _sysoldgetrlimit_()
(slot __NRgetrlimit_) and _sysgetrlimit_() (slot
__NRugetrlimit_).
• Linux 2.4 increased the size of user and group IDs from 16 to
32 bits. To support this change, a range of system calls were
added (e.g., [chown32(2)](../man2/chown32.2.html), [getuid32(2)](../man2/getuid32.2.html), [getgroups32(2)](../man2/getgroups32.2.html),
[setresuid32(2)](../man2/setresuid32.2.html)), superseding earlier calls of the same name
without the "32" suffix.
• Linux 2.4 added support for applications on 32-bit
architectures to access large files (i.e., files for which the
sizes and file offsets can't be represented in 32 bits.) To
support this change, replacements were required for system
calls that deal with file offsets and sizes. Thus the
following system calls were added: [fcntl64(2)](../man2/fcntl64.2.html), [getdents64(2)](../man2/getdents64.2.html),
[stat64(2)](../man2/stat64.2.html), [statfs64(2)](../man2/statfs64.2.html), [truncate64(2)](../man2/truncate64.2.html), and their analogs that
work with file descriptors or symbolic links. These system
calls supersede the older system calls which, except in the
case of the "stat" calls, have the same name without the "64"
suffix.
On newer platforms that only have 64-bit file access and 32-bit
UIDs/GIDs (e.g., alpha, ia64, s390x, x86-64), there is just a
single version of the UID/GID and file access system calls. On
platforms (typically, 32-bit platforms) where the *64 and *32
calls exist, the other versions are obsolete.
• The _rtsig*_ calls were added in Linux 2.2 to support the
addition of real-time signals (see [signal(7)](../man7/signal.7.html)). These system
calls supersede the older system calls of the same name without
the "rt_" prefix.
• The [select(2)](../man2/select.2.html) and [mmap(2)](../man2/mmap.2.html) system calls use five or more
arguments, which caused problems in the way argument passing on
the i386 used to be set up. Thus, while other architectures
have _sysselect_() and _sysmmap_() corresponding to __NRselect_
and __NRmmap_, on i386 one finds _oldselect_() and _oldmmap_()
(routines that use a pointer to an argument block) instead.
These days passing five arguments is not a problem any more,
and there is a __NR_newselect_ that corresponds directly to
_sysselect_() and similarly __NRmmap2_. s390x is the only
64-bit architecture that has _oldmmap_().Architecture-specific details: Alpha getxgid(2) returns a pair of GID and effective GID via registers r0 and r20; it is provided instead of getgid(2) and getegid(2).
**getxpid**(2)
returns a pair of PID and parent PID via registers **r0** and
**r20**; it is provided instead of [getpid(2)](../man2/getpid.2.html) and [getppid(2)](../man2/getppid.2.html).
**old_adjtimex**(2)
is a variant of [adjtimex(2)](../man2/adjtimex.2.html) that uses _struct timeval32_, for
compatibility with OSF/1.
**getxuid**(2)
returns a pair of GID and effective GID via registers **r0**
and **r20**; it is provided instead of [getuid(2)](../man2/getuid.2.html) and
[geteuid(2)](../man2/geteuid.2.html).
**sethae**(2)
is used for configuring the Host Address Extension register
on low-cost Alphas in order to access address space beyond
first 27 bits.SEE ALSO top
[intro(2)](../man2/intro.2.html), [syscall(2)](../man2/syscall.2.html), [unimplemented(2)](../man2/unimplemented.2.html), [errno(3)](../man3/errno.3.html), [libc(7)](../man7/libc.7.html),
[vdso(7)](../man7/vdso.7.html), **ausyscall**(8)COLOPHON top
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man-pages@man7.orgLinux man-pages 6.10 2024-11-17 syscalls(2)
Pages that refer to this page:strace(1), intro(2), syscall(2), unimplemented(2), stapprobes(3stap), libc(7), man-pages(7), vdso(7)