setarch(8) - Linux man page

Name

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

Synopsis

setarch arch [options] [program [arguments]]
arch [options] [program [arguments]]

Description

setarch This utility currently only affects the output of uname -m. For example, on an AMD64 system, running 'setarch i386 program' will cause 'program' to see i686 (or other relevant arch) instead of x86_64 as machine type. It also allows to set various personality options. The default program is /bin/sh.

Options

-v, "--verbose"
Be verbose.
-h, "--help"
Display help (it is also displayed when setarch takes no arguments).
-3, "--3gb"
Specifies that processes should use a maximum of 3GB of address space on systems where it is supported (ADDR_LIMIT_3GB).
-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.

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-ng package and is available from ftp://ftp.kernel.org/pub/linux/utils/util-linux-ng/.