- Copy stable/10@296371 to releng/10.3 in preparation for 10.3-RC1
builds.
- Update newvers.sh to reflect RC1.
- Update __FreeBSD_version to reflect 10.3.
- Update default pkg(8) configuration to use the quarterly branch.

Approved by: re (implicit)

MFC r283497:

Convert SCM_TIMESTAMP in recvmsg().

MFC r283488:

Implement recvmmsg() and sendmmsg() system calls.

MFC r283487:

Reduce duplication between MD Linux code by moving msg related
struct definitions out into the compat/linux/linux_socket.h

MFC r283413:

64-bit paltforms, like x86_64, do not use multiplexing on
socketcall system calls.

Copy head (r256279) to stable/10 as part of the 10.0-RELEASE cycle.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

Reduce duplication between i386/linux/linux.h and amd64/linux32/linux.h
by moving bits that are MI out into headers in compat/linux.

Reviewed by: Chagin Dmitry dmitry | gmail
MFC after: 2 weeks

linux compat: improve and fix sendmsg/recvmsg compatibility

- implement baseic stubs for capget, capset, prctl PR_GET_KEEPCAPS
and prctl PR_SET_KEEPCAPS.
- add SCM_CREDS support to sendmsg and recvmsg
- modify sendmsg to ignore control messages if not using UNIX
domain sockets

This should allow linux pulse audio daemon and client work on FreeBSD
and interoperate with native counter-parts modulo the differences in
pulseaudio versions.

PR: kern/149168
Submitted by: John Wehle <john@feith.com>
Reviewed by: netchild
MFC after: 2 weeks

Implement MSG_CMSG_CLOEXEC flag for linux_recvmsg().

Approved by: kib (mentor)
MFC after: 1 month

Somewhere between 2.6.23 and 2.6.27, Linux added SOCK_CLOEXEC and
SOCK_NONBLOCK flags, that allow to save fcntl() calls.

Implement a variation of the socket() syscall which takes a flags
in addition to the type argument.

Approved by: kib (mentor)
MFC after: 1 month

Return EINVAL in case when the incorrect or unsupported
type argument is specified.

Do not map type argument value as its Linux values are
identical to FreeBSD values.

Approved by: kib (mentor)

Emulate SO_PEERCRED socket option.
Temporarily use 0 for pid member as the FreeBSD does not cache remote
UNIX domain socket peer pid.

PR: kern/102956
Reviewed by: rwatson
Approved by: kib (mentor)
MFC after: 1 month

To avoid excessive code duplication move MI definitions to the MI
header file. As it is defined in Linux.

Approved by: kib (mentor)
MFC after: 1 month

Make linux_sendmsg() and linux_recvmsg() work on linux32/amd64.
Change types used in the linux' struct msghdr and struct cmsghdr
definitions to the properly-sized architecture-specific types.
Move ancillary data handler from linux_sendit() to linux_sendmsg().

Submitted by: dchagin

Fix typo in the BSD copyright: s/withough/without/

Spotted and suggested by: des
MFC after: 3 weeks

translate the flags in recvfrom and recvmsg from linux to bsd ones

Approved by: marcel