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 er-
ror.
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 Documenta-
tion/arm64/sve.rst (or Documentation/arm64/sve.txt before Linux 5.3).
Linux man-pages 6.9.1 2024-06-02 PR_SVE_GET_VL(2const)
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