add support COMPAT_LINUX for aarch64

Don't read data from userland directly. This simply does not work on any
recent x86 CPU (thanks to SMAP) and all architectures that forbid direct
access to userland from the kernel. But I guess no on

Don't read data from userland directly. This simply does not work on any
recent x86 CPU (thanks to SMAP) and all architectures that forbid direct
access to userland from the kernel. But I guess no one noticed because no
one ever uses compat_linux, right?

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add sendmmsg and recvmmsg

Add basic IPV6 level socket options support (IPV6_V6ONLY).

dependant -> dependent

update linux_sys_socket() to understand the flags that are now
included in the "type" parameter. in linux_sys_sendmsg(),
if we see an SCM_CREDENTIALS control message, just drop it
instead of giving

update linux_sys_socket() to understand the flags that are now
included in the "type" parameter. in linux_sys_sendmsg(),
if we see an SCM_CREDENTIALS control message, just drop it
instead of giving an error. the linux and native versions of
the cred-passing operation are very different and some apps
(eg. linux pulseaudio library talking to a native server)
will work without the control data.

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Add LINUX_SIOCGIFMTU and LINUX_IP_HDRINCL support.
Fixes part of PR/31358
The other parts are rather too intrusive to be fixed as in the PR.

Add a new linux_msghdr structure, as its size differs on 64bit archs.
Do the needed conversions in sendmsg/recvmsg syscalls, and adjust
their definitions accordingly.

Add LINUX_CMSG_{SPACE,LEN} macros. Use then when calculating the
msg_controllen size, when converting the control message buffer from
native (previous version was missing the linux_cmsghdr size).

Remove clause 3 and 4 from TNF licenses

Fix long-term breakage in the definition of 'control' data for linux.
cmsg->cmsg_len is 'size_t' not 'socklen_t' - so it is 8 bytes on 64bit
platforms instead of 4. There is also never padding after

Fix long-term breakage in the definition of 'control' data for linux.
cmsg->cmsg_len is 'size_t' not 'socklen_t' - so it is 8 bytes on 64bit
platforms instead of 4. There is also never padding after the header.
Redo linux sendmsg() so that it stands a chance of getting it right.
Redo linux recvmsg() so that it process control data directly from the mbuf
list. Allowing it to hack the data without using the stackgap.

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Kill caddr_t; there will be some MI fallout, but it will be fixed shortly.

merge ktrace-lwp.

First work on COMPAT_LINUX/amd64
Process startup and dynamiclinking work, but processes hang due to
Linux arch_prctl(2) not being really supported yet.

More complete sendmsg(2) and recvmsg(2) emulation:
* translate MSG_* flags
* rewrite CMSG level/type to appropriate NetBSD value on input, and to Linux
value on output
* handle different CMSG_DATA

More complete sendmsg(2) and recvmsg(2) emulation:
* translate MSG_* flags
* rewrite CMSG level/type to appropriate NetBSD value on input, and to Linux
value on output
* handle different CMSG_DATA alignment for some archs

This fixes SCM_RIGHTS passing. Other SCM_* types are not supported -
the set is different on NetBSD and Linux. SCM_TIMESTAMP doesn't seem
to be actually implemented in Linux 2.5.15, so it's not supported
for Linux binaries either (for now).

PR: 21577 by Todd Vierling

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Crude first cut at ARMLinux binary compatibility. Successfully runs
"/emul/linux/bin/echo hello, world", dynamically linked.

Enable Mips Linux emulation in header files

Added Linux compatibility support for powerpc ports

Added linux compat support on m68k ports.

Assign my copyright to TNF. Merge with others were appropriate.
Regen syscall files after script change.

Attempt to fix the mess.

Split linux_socket.h into i386 and common parts.

Convert TCP socket options.

Convert IP socket options.

Added Linux compat code.