ARCH_PRCTL(2) | Linux Programmer's Manual | ARCH_PRCTL(2) |
NAME
arch_prctl - set architecture-specific thread stateSYNOPSIS
#include<asm/prctl.h>
<sys/prctl.h>
int arch_prctl(int code , unsigned long addr );
int arch_prctl(int code , unsigned long * addr );
DESCRIPTION
The arch_prctl() function sets architecture-specific process or thread state. code selects a subfunction and passes argument addr to it; addr is interpreted as either an unsigned long for the "set" operations, or as an unsigned long *, for the "get" operations.Subfunctions for x86-64 are:
- ARCH_SET_FS
- Set the 64-bit base for the FS register to addr.
- ARCH_GET_FS
- Return the 64-bit base value for the FS register of the current thread in the unsigned long pointed to by addr.
- ARCH_SET_GS
- Set the 64-bit base for the GS register to addr.
- ARCH_GET_GS
- Return the 64-bit base value for the GS register of the current thread in the unsigned long pointed to by addr.
RETURN VALUE
On success, arch_prctl() returns 0; on error, -1 is returned, and errno is set to indicate the error.ERRORS
- 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.
CONFORMING TO
arch_prctl() is a Linux/x86-64 extension and should not be used in programs intended to be portable.NOTES
arch_prctl() is supported only on Linux/x86-64 for 64-bit programs currently.SEE ALSO
mmap(2), modify_ldt(2), prctl(2), set_thread_area(2)COLOPHON
This page is part of release 3.53 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/.2007-12-26 | Linux |