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NAME | SYNOPSIS | DESCRIPTION | OPTIONS | EXAMPLE | AUTHORS | SEE ALSO | REPORTING BUGS | AVAILABILITY |
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SETARCH(8) System Administration SETARCH(8)
setarch - change reported architecture in new program environment
and/or set personality flags
setarch [arch] [options] [program [argument...]]
setarch --list|-h|-V
arch [options] [program [argument...]]
setarch modifies execution domains and process personality flags.
The execution domains 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 can also be used to set various personality options. The
default program is /bin/sh.
Since version 2.33 the arch command line argument is optional and
setarch may be used to change personality flags (ADDR_LIMIT_*,
SHORT_INODE, etc) without modification of the execution domain.
--list
List the architectures that setarch knows about. Whether
setarch can actually set each of these architectures depends
on the running kernel.
--show[=personality]
Show the currently active personality and flags. If the
personality argument is provided, it is shown instead of the
current one. personality is a hexadecimal number with values
was described in sys/personality.h.
--uname-2.6
Causes the program to see a kernel version number beginning
with 2.6. Turns on UNAME26.
-v, --verbose
Be verbose.
-3, --3gb
Specifies program should use a maximum of 3GB of address
space. Supported on x86. Turns on ADDR_LIMIT_3GB.
--4gb
This option has no effect. It is retained for backward
compatibility only, and may be removed in future releases.
-B, --32bit
Limit the address space to 32 bits to emulate hardware.
Supported on ARM and Alpha. Turns on ADDR_LIMIT_32BIT.
-F, --fdpic-funcptrs
Treat user-space function pointers to signal handlers as
pointers to address descriptors. This option has no effect on
architectures that do not support FDPIC ELF binaries. In
kernel v4.14 support is limited to ARM, Blackfin, Fujitsu
FR-V, and SuperH CPU architectures.
-I, --short-inode
Obsolete bug emulation flag. Turns on SHORT_INODE.
-L, --addr-compat-layout
Provide legacy virtual address space layout. Use when the
program binary does not have PT_GNU_STACK ELF header. Turns
on ADDR_COMPAT_LAYOUT.
-R, --addr-no-randomize
Disables randomization of the virtual address space. Turns on
ADDR_NO_RANDOMIZE.
-S, --whole-seconds
Obsolete bug emulation flag. Turns on WHOLE_SECONDS.
-T, --sticky-timeouts
This makes select(2), pselect(2), and ppoll(2) system calls
preserve the timeout value instead of modifying it to reflect
the amount of time not slept when interrupted by a signal
handler. Use when program depends on this behavior. For more
details see the timeout description in select(2) manual page.
Turns on STICKY_TIMEOUTS.
-X, --read-implies-exec
If this is set then mmap(2) PROT_READ will also add the
PROT_EXEC bit - as expected by legacy x86 binaries. Notice
that the ELF loader will automatically set this bit when it
encounters a legacy binary. Turns on READ_IMPLIES_EXEC.
-Z, --mmap-page-zero
SVr4 bug emulation that will set mmap(2) page zero as
read-only. Use when program depends on this behavior, and the
source code is not available to be fixed. Turns on
MMAP_PAGE_ZERO.
-h, --help
Display help text and exit.
-V, --version
Print version and exit.
setarch --addr-no-randomize mytestprog
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
Elliot Lee <sopwith@redhat.com>, Jindrich Novy
<jnovy@redhat.com>, Karel Zak <kzak@redhat.com>
personality(2), select(2)
For bug reports, use the issue tracker at
https://github.com/util-linux/util-linux/issues.
The setarch command is part of the util-linux package which can
be downloaded from Linux Kernel Archive
<https://www.kernel.org/pub/linux/utils/util-linux/>. This page
is part of the util-linux (a random collection of Linux
utilities) project. Information about the project can be found at
⟨https://www.kernel.org/pub/linux/utils/util-linux/⟩. If you have
a bug report for this manual page, send it to
util-linux@vger.kernel.org. This page was obtained from the
project's upstream Git repository
⟨git://git.kernel.org/pub/scm/utils/util-linux/util-linux.git⟩ on
2024-06-14. (At that time, the date of the most recent commit
that was found in the repository was 2024-06-10.) If you discover
any rendering problems in this HTML version of the page, or you
believe there is a better or more up-to-date source for the page,
or you have corrections or improvements to the information in
this COLOPHON (which is not part of the original manual page),
send a mail to man-pages@man7.org
util-linux 2.39.594-1e0ad 2023-07-19 SETARCH(8)
Pages that refer to this page: personality(2)
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HTML rendering created 2024-06-26 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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