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unimplemented(2) — Linux manual page

UNIMPLEMENTED(2)           System Calls ManualUNIMPLEMENTED(2)

NAME        top

       afs_syscall, break, fattach, fdetach, ftime, getmsg, getpmsg,       gtty, isastream, lock, madvise1, mpx, prof, profil, putmsg,       putpmsg, security, stty, tuxcall, ulimit, vserver - unimplemented       system calls

SYNOPSIS        top

       Unimplemented system calls.

DESCRIPTION        top

       These system calls are not implemented in the Linux kernel.

RETURN VALUE        top

       These system calls always return -1 and seterrno toENOSYS.

NOTES        top

       Note thatftime(3),profil(3), andulimit(3) are implemented as       library functions.       Some system calls, likealloc_hugepages(2),free_hugepages(2),ioperm(2),iopl(2), andvm86(2) exist only on certain       architectures.       Some system calls, likeipc(2),create_module(2),init_module(2),       anddelete_module(2) exist only when the Linux kernel was built       with support for them.

SEE ALSO        top

syscalls(2)

COLOPHON        top

       This page is part of theman-pages (Linux kernel and C library       user-space interface documentation) project.  Information about       the project can be found at        ⟨https://www.kernel.org/doc/man-pages/⟩.  If you have a bug report       for this manual page, see       ⟨https://git.kernel.org/pub/scm/docs/man-pages/man-pages.git/tree/CONTRIBUTING⟩.       This page was obtained from the tarball man-pages-6.15.tar.gz       fetched from       ⟨https://mirrors.edge.kernel.org/pub/linux/docs/man-pages/⟩ on       2025-08-11.  If you discover any rendering problems in this HTML       version of the page, or you believe there is a better or more up-       to-date source for the page, or you have corrections or       improvements to the information in this COLOPHON (which isnot       part of the original manual page), send a mail to       man-pages@man7.orgLinux man-pages 6.15            2025-05-17UNIMPLEMENTED(2)

Pages that refer to this page:ioctl(2), syscalls(2), systemd.exec(5)

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