linux32(1)



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 <https://www.kernel.org/pub/linux/utils/util-
       linux/>.

util-linux                       December 2014                      SETARCH(8)

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