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SETARCH

Section: Linux Programmer's Manual (8)
Updated: Jun 2007
Index Return to Main Contents

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