ENOSYS(1)                        User Commands                       ENOSYS(1)

NAME
       enosys - utility make syscalls fail with ENOSYS

SYNOPSIS
       enosys [--syscall|-s syscall] command

DESCRIPTION
       enosys is a simple command to execute a child process for which certain
       syscalls fail with errno ENOSYS.

       It can be used to test the behavior of applications in the face of
       missing syscalls as would happen when running on old kernels.

OPTIONS
       -s, --syscall
           Syscall to block. Can be specified multiple times.

       -i, --ioctl
           Ioctl to block. Can be specified multiple times.

       -l, --list
           List syscalls known to enosys.

       -m, --list-ioctl
           List ioctls known to enosys.

       -h, --help
           Display help text and exit.

       -V, --version
           Print version and exit.

EXIT STATUS
       enosys exits with the status code of the executed process.  The
       following values have special meanings:

       1
           internal error

       2
           system does not provide the necessary functionality

AUTHORS
       Thomas Weissschuh <thomas@t-8ch.de>

SEE ALSO
       syscall(2)

REPORTING BUGS
       For bug reports, use the issue tracker at
       <https://github.com/util-linux/util-linux/issues>.

AVAILABILITY
       The enosys command is part of the util-linux package which can be
       downloaded from Linux Kernel Archive
       <https://www.kernel.org/pub/linux/utils/util-linux/>.

util-linux 2.40.1                 2024-05-06                         ENOSYS(1)