PR_SVE_GET_VL(2const) — Linux manual page

PR_SVE_GET_VL(2const)                              PR_SVE_GET_VL(2const)

NAME

       PR_SVE_GET_VL - get the thread's SVE vector length

LIBRARY

       Standard C library (libc, -lc)

SYNOPSIS

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

       int prctl(PR_SVE_GET_VL);

DESCRIPTION

       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

       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

       EINVAL SVE is not available on this platform.

STANDARDS

       Linux.  arm64 only.

HISTORY

       Linux 4.15 (arm64).

CAVEATS

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

SEE ALSO

       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

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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)

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