PR_SVE_GET_VL(2const) — Linux manual page

PR_SVE_GET_VL(2const)                              PR_SVE_GET_VL(2const)

NAME         top

       PR_SVE_GET_VL - get the thread's SVE vector length

LIBRARY         top

       Standard C library (libc, -lc)

SYNOPSIS         top

       #include <linux/prctl.h>  /* Definition of PR_* constants */
       #include <sys/prctl.h>

       int prctl(PR_SVE_GET_VL);

DESCRIPTION         top

       Get the thread's current SVE vector length configuration.

       This operation returns a nonnegative value that describes the
       current configuration.  The bits corresponding to
       PR_SVE_VL_LEN_MASK contain the currently configured vector length
       in bytes.  The bit corresponding to PR_SVE_VL_INHERIT indicates
       whether the vector length will be inherited across execve(2).

RETURN VALUE         top

       On success, PR_SVE_GET_VL, return the nonnegative values
       described above.  On error, -1 is returned, and errno is set to
       indicate the error.

ERRORS         top

       EINVAL SVE is not available on this platform.

STANDARDS         top

       Linux.  arm64 only.

HISTORY         top

       Linux 4.15 (arm64).

CAVEATS         top

       There is no way to determine whether there is a pending vector
       length change that has not yet taken effect.

SEE ALSO         top

       prctl(2), PR_SVE_SET_VL(2const)

       For more information, see the kernel source file
       Documentation/arm64/sve.rst (or Documentation/arm64/sve.txt
       before Linux 5.3).

COLOPHON         top

       This page is part of the man-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-6.9.1.tar.gz
       fetched from
       ⟨https://mirrors.edge.kernel.org/pub/linux/docs/man-pages/⟩ on
       2024-06-26.  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 is not
       part of the original manual page), send a mail to
       [email protected]

Linux man-pages 6.9.1          2024-06-02          PR_SVE_GET_VL(2const)

Pages that refer to this page: prctl(2),  PR_SVE_SET_VL(2const)

HTML rendering created 2024-06-26 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH.