PR_SVE_GET_VL

(2const)

get the thread's SVE vector length

System callsmanpages-dev 6.9.1-1

#include <linux/prctl.h> /* Definition of PR_* constants */ #include <sys/prctl.h> int prctl(PR_SVE_GET_VL);

LIBRARY

Standard C library (libc, -lc)

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.