plucky (2) PR_SVE_GET_VL.2const.gz

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).