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    Command Linux
    Home - man page - UNIMPLEMENTED

    UNIMPLEMENTED

    WillieBy WillieFebruary 26, 2026Updated:March 30, 2026No Comments1 Min Read
     

    NAME

    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

    Unimplemented system calls.  

    DESCRIPTION

    These system calls are not implemented in the Linux kernel.  

    RETURN VALUE

    These system calls always return -1 and set errno to ENOSYS.  

    NOTES

    Note that ftime(3), profil(3), and ulimit(3) are implemented as library functions.

    Some system calls, like alloc_hugepages(2), free_hugepages(2), ioperm(2), iopl(2), and vm86(2) exist only on certain architectures.

    Some system calls, like ipc(2), create_module(2), init_module(2), and delete_module(2) exist only when the Linux kernel was built with support for them.  

    COLOPHON

    This page is part of release 3.74 of the Linux man-pages project. A description of the project, information about reporting bugs, and the latest version of this page, can be found at http://www.kernel.org/doc/man-pages/.

    Willie
    • Website

    Willie has over 15 years of experience in Linux system administration and DevOps. After managing infrastructure for startups and enterprises alike, he founded Command Linux to share the practical knowledge he wished he had when starting out. He oversees content strategy and contributes guides on server management, automation, and security.

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