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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
   various 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/⟩.



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