arch_prctl() - Unix, Linux System Call

NAME

arch_prctl - set architecture specific thread state

#include <asm/prctl.h>
#include <sys/prctl.h>

int arch_prctl(int code, unsigned long addr)

The arch_prctl() function sets architecture specific process or thread state. code selects a subfunction and passes argument addr to it.

Sub functions for x86-64 are:

Tag	Description
ARCH_SET_FS	Set the 64bit base for the FS register toaddr.
ARCH_GET_FS	Return the 64bit base value for theFS register of the current thread in theunsigned long pointed to by the address parameter
ARCH_SET_GS	Set the 64bit base for the GS register to addr.
ARCH_GET_GS	Return the 64bit base value for the GS register of the current thread in the unsigned long pointed to by the address parameter.

Tag	Description
EFAULT	addr points to an unmapped address or is outside the process address space.
EINVAL	code is not a valid subcommand.
EPERM	addr is outside the process address space.

Man page written by Andi Kleen.

arch_prctl() is a Linux/x86-64 extension and should not be used in programs intended to be portable.