linux.4: improve the path translation clarificiation

As suggested by martin@lispworks.com, refer to the compat path
explicitly, and correct an existing grammaro.

PR: 277804
Fixes: f66e71fa78e1 ("l

linux.4: improve the path translation clarificiation

As suggested by martin@lispworks.com, refer to the compat path
explicitly, and correct an existing grammaro.

PR: 277804
Fixes: f66e71fa78e1 ("linux.4: clarify path translation")
Sponsored by: The FreeBSD Foundation

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linux.4: clarify path translation

Try to be a little more explicit about the path translation mechanism
accessing /compat/linux/<path> then falling back to /<path>.

PR: 277804
Reviewed by: fernape

linux.4: clarify path translation

Try to be a little more explicit about the path translation mechanism
accessing /compat/linux/<path> then falling back to /<path>.

PR: 277804
Reviewed by: fernape
Sponsored by: The FreeBSD Foundation

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linux: Update linux manpage to mention mqueuefs

Reviewed by: imp, kib
Pull Request: https://github.com/freebsd/freebsd-src/pull/1248

man filesystems: fix xrefs after move to section 4

Reviewed by: des, imp
Pull Request: https://github.com/freebsd/freebsd-src/pull/1077

Remove $FreeBSD$: two-line nroff pattern

Remove /^\.\\"\n\.\\"\s*\$FreeBSD\$$\n/

linux(4): Add compat.linux32.emulate_i386 knob.

Historically 32-bit Linuxulator under amd64 emulated the real i386
behavior. Since 3d8dd983 the old i386 Linux world can't be used under
amd64 Linuxul

linux(4): Add compat.linux32.emulate_i386 knob.

Historically 32-bit Linuxulator under amd64 emulated the real i386
behavior. Since 3d8dd983 the old i386 Linux world can't be used under
amd64 Linuxulator as it don't know anything about amd64 machine (which
is returned now by newuname() syscall). So, add a knob to allow to swith
the behavior and use i386 Linux binaries on amd64.
Set knob to the new behavior as I think this is common to the modern
Linux distros.

Reviewed by: Pau Amma (doc), emaste
Differential revision: https://reviews.freebsd.org/D34708
MFC after: 2 weeks

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linux: Make compat.linux.preserve_vstatus default to 1

From a user point of view, this makes ^T work out of the box.

Reviewed By: debdrup (man page)
Sponsored By: EPSRC
Differential Revision: https

linux: Make compat.linux.preserve_vstatus default to 1

From a user point of view, this makes ^T work out of the box.

Reviewed By: debdrup (man page)
Sponsored By: EPSRC
Differential Revision: https://reviews.freebsd.org/D33842

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linux: More man page tweaks

Mention debootstrap(8) and improve the wording.

Reviewed By: debdrup, emaste, Pau Amma
Sponsored By: EPSRC
Differential Revision: https://reviews.freebsd.org/D33772

linux(4): man page tweaks

Advertise rc.conf method as the right way to enable it, mention
file system mapping... and change some wording.

Reviewed By: emaste, debdrup, Pau Amma
Sponsored By: EPSRC

linux(4): man page tweaks

Advertise rc.conf method as the right way to enable it, mention
file system mapping... and change some wording.

Reviewed By: emaste, debdrup, Pau Amma
Sponsored By: EPSRC
Differential Revision: https://reviews.freebsd.org/D33720

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linux(4): Get rid of Linuxulator kernel build options.

Stop confusing people, retire COMPAT_LINUX and COMPAT_LINUX32 kernel
build options. Since we have 32 and 64 bit Linux emulators, we can't build

linux(4): Get rid of Linuxulator kernel build options.

Stop confusing people, retire COMPAT_LINUX and COMPAT_LINUX32 kernel
build options. Since we have 32 and 64 bit Linux emulators, we can't build both
emulators together into the kernel. I don't think it matters, Linux emulation
depends on loadable modules (via rc).

Cut LINPROCFS and LINSYSFS for consistency.

PR: 215061
Reviewed by: bcr (manpages), trasz
Differential Revision: https://reviews.freebsd.org/D30751
MFC after: 2 weeks

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linuxolator: Add compat.linux.setid_allowed knob

PR: 21463
Reported by: kris
Reviewed by: dchagin
Tested by: trasz
Sponsored by: The FreeBSD Foundation
MFC after: 1 week
Differential Revision: https

linuxolator: Add compat.linux.setid_allowed knob

PR: 21463
Reported by: kris
Reviewed by: dchagin
Tested by: trasz
Sponsored by: The FreeBSD Foundation
MFC after: 1 week
Differential Revision: https://reviews.freebsd.org/D28154

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- add more linux socket options (sorted by value)
- map those IPv4 / IPv6 socket options which exist in FreeBSD
+ most of them visually verified to have the same type/layout of arguments
+ not

- add more linux socket options (sorted by value)
- map those IPv4 / IPv6 socket options which exist in FreeBSD
+ most of them visually verified to have the same type/layout of arguments
+ not tested with linux programs to behave as intended
- be more human readable for known options which are not handled
- be more verbose for unhandled socket message flags we know about
- print the jail ID in linux_msg if run in a jail
- add possibility to print debug message about known missing parts only once
- add multiple levels of sysctl linux.debug:
1: print debug messages, tell about unimplemented stuff (only once)
2: like 1, but also print messages about implemented but not tested
stuff (only once)
3+: like 2, but no rate limiting of messages
- increase default linux debug level from 1 to 3

We are a lot more verbose in as we need to be (e.g. some of the IP socket
options which are the same, and share the same memory layout, and are
believed to work). The reason is that we have no good testsuite to test those
linux-bits. The LTP or other test suites like the python one, are not fully
up to the task we need. As such the excessive messages about emulated but not
tested socket options.

IMO any MFC (possible, but most probably not by me) should set the default
debug level to 1.

Discussed with: trasz

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Fix a bunch of mdoc issues found by mandoc -Tlint.

Make linux(4) man page also mention /compat/linux/dev.

MFC after: 2 weeks
Sponsored by: The FreeBSD Foundation

Make the linux rc script use linrdlnk by default.

This fixes Linux gettyname(3), with caveats (see PR).

PR: kern/240767
MFC after: 2 weeks
Sponsored by: The FreeBSD Foundation
Differential Revisio

Make the linux rc script use linrdlnk by default.

This fixes Linux gettyname(3), with caveats (see PR).

PR: kern/240767
MFC after: 2 weeks
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D25558

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Add compat.linux.debug sysctl, to make it possible to silence down
the debug messages. While here, clean up some variable naming.

Reviewed by: bcr (manpages), emaste
MFC after: 2 weeks
Sponsored by:

Add compat.linux.debug sysctl, to make it possible to silence down
the debug messages. While here, clean up some variable naming.

Reviewed by: bcr (manpages), emaste
MFC after: 2 weeks
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D25230

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Make linux(4) set the openfiles soft resource limit to 1024 for Linux
applications, which often depend on this being the case. There's a new
sysctl, compat.linux.default_openfiles, to control this b

Make linux(4) set the openfiles soft resource limit to 1024 for Linux
applications, which often depend on this being the case. There's a new
sysctl, compat.linux.default_openfiles, to control this behaviour.

Reviewed by: kevans, emaste, bcr (manpages)
MFC after: 2 weeks
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D25177

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Add a hack to make ^T work for Linux binaries, enabled with
'compat.linux.preserve_vstatus=1' sysctl.

MFC after: 2 weeks
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.f

Add a hack to make ^T work for Linux binaries, enabled with
'compat.linux.preserve_vstatus=1' sysctl.

MFC after: 2 weeks
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D21967

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Add compat.linux.emul_path, so it can be set to something other
than "/compat/linux". Useful when you have several compat directories
with different Linux versions and you don't want to clash with f

Add compat.linux.emul_path, so it can be set to something other
than "/compat/linux". Useful when you have several compat directories
with different Linux versions and you don't want to clash with files
installed by linux-c7 packages.

Reviewed by: bcr (manpages)
MFC after: 2 weeks
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D22574

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Improve Linuxulator man pages to better reflect the current state,
and add some missing Xrs.

Reviewed by: brueffer, emaste (earlier version)
MFC after: 2 weeks
Sponsored by: The FreeBSD Foundation
D

Improve Linuxulator man pages to better reflect the current state,
and add some missing Xrs.

Reviewed by: brueffer, emaste (earlier version)
MFC after: 2 weeks
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D22277

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Document the fact that Linux binaries depend on pty(4).

The source part of the review will be addressed in a different way.

Reviewed by: emaste, brooks
MFC after: 2 weeks
Sponsored by: The FreeBSD

Document the fact that Linux binaries depend on pty(4).

The source part of the review will be addressed in a different way.

Reviewed by: emaste, brooks
MFC after: 2 weeks
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D21492

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Merge ^/head r321383 through r322397.

MFhead@r321970

MFhead@r321851

Implement proper Linux /dev/fd and /proc/self/fd behavior by adding
Linux specific things to the native fdescfs file system.

Unlike FreeBSD, the Linux fdescfs is a directory containing a symbolic
li

Implement proper Linux /dev/fd and /proc/self/fd behavior by adding
Linux specific things to the native fdescfs file system.

Unlike FreeBSD, the Linux fdescfs is a directory containing a symbolic
links to the actual files, which the process has open.
A readlink(2) call on this file returns a full path in case of regular file
or a string in a special format (type:[inode], anon_inode:<file-type>, etc..).
As well as in a FreeBSD, opening the file in the Linux fdescfs directory is
equivalent to duplicating the corresponding file descriptor.

Here we have mutually exclusive requirements:
- in case of readlink(2) call fdescfs lookup() method should return VLNK
vnode otherwise our kern_readlink() fail with EINVAL error;
- in the other calls fdescfs lookup() method should return non VLNK vnode.

For what new vnode v_flag VV_READLINK was added, which is set if fdescfs has beed
mounted with linrdlnk option an modified kern_readlinkat() to properly handle it.

For now For Linux ABI compatibility mount fdescfs volume with linrdlnk option:

mount -t fdescfs -o linrdlnk null /compat/linux/dev/fd

Reviewed by: kib@
MFC after: 1 week
Relnotes: yes

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