setarch Man page

SETARCH(8) System Administration SETARCH(8)

NAME

setarch – change reported architecture in new program environment and
set personality flags

SYNOPSIS

setarch arch [options] [program [argument…]]

arch [options] [program [argument…]]

setarch –list|-h|-V

DESCRIPTION

setarch currently only affects the output of uname -m. For example, on
an AMD64 system, running setarch i386 program will cause program to see
i686 instead of x86_64 as the machine type. It also allows to set var‐
ious personality options. The default program is /bin/sh.

OPTIONS

–list List the architectures that setarch knows about. Whether
setarch can actually set each of these architectures depends on
the running kernel.

–uname-2.6
Causes the program to see a kernel version number beginning with
2.6.

-v, –verbose
Be verbose.

-3, –3gb
Specifies that processes should use a maximum of 3GB of address
space on systems where it is supported (ADDR_LIMIT_3GB).

–4gb Ignored (for backward compatibility only).

-B, –32bit
Turns on ADDR_LIMIT_32BIT.

-F, –fdpic-funcptrs
Userspace function pointers point to descriptors (turns on
FDPIC_FUNCPTRS).

-I, –short-inode
Turns on SHORT_INODE.

-L, –addr-compat-layout
Changes the way virtual memory is allocated (turns on the
ADDR_COMPAT_LAYOUT).

-R, –addr-no-randomize
Disables randomization of the virtual address space (turns on
ADDR_NO_RANDOMIZE).

-S, –whole-seconds
Turns on WHOLE_SECONDS.

-T, –sticky-timeouts
Turns on STICKY_TIMEOUTS.

-X, –read-implies-exec
Turns on READ_IMPLIES_EXEC.

-Z, –mmap-page-zero
Turns on MMAP_PAGE_ZERO.

-V, –version
Display version information and exit.

-h, –help
Display help text and exit.

EXAMPLES
setarch ppc32 rpmbuild –target=ppc –rebuild foo.src.rpm
setarch ppc32 -v -vL3 rpmbuild –target=ppc –rebuild bar.src.rpm
setarch ppc32 –32bit rpmbuild –target=ppc –rebuild foo.src.rpm

AUTHOR

Elliot Lee ⟨sopwith@redhat.com⟩
Jindrich Novy ⟨jnovy@redhat.com⟩

AVAILABILITY
The setarch command is part of the util-linux package and is available
from Linux Kernel Archive ⟨ftp://ftp.kernel.org/pub/linux/utils/util-
linux/⟩.

util-linux December 2014 SETARCH(8)