see
https://sourceware.org/ml/libc-alpha/2016-01/msg00822.html

marks different RLD_MAP for debugging PIE binaries.

following
http://www.sco.com/developers/gabi/latest/ch4.sheader.html

see
https://sourceware.org/ml/libc-alpha/2015-03/msg00580.html

following
https://sourceware.org/ml/libc-alpha/2014-05/msg00332.html

add ilp32 related relocs and alternative names for a few macros following
https://sourceware.org/ml/libc-alpha/2014-11/msg00455.html

see
https://sourceware.org/ml/libc-alpha/2013-11/msg00315.html
https://sourceware.org/ml/libc-alpha/2013-11/msg00314.html

following the corresponding binutils and glibc changes
https://sourceware.org/ml/binutils/2013-10/msg00372.html

it was changed to EM_OR1K in 200d1547
as that was meant to be the official name, but glibc and the latest
gabi spec still uses the EM_OPENRISC name:
http://www.sco.com/developers/gabi/latest/ch4.eheader.html
binutils defines both macros so we should do the same for backward
compatibility.

placing the opening brace on the same line as the struct keyword/tag
is the style I prefer and seems to be the prevailing practice in more
recent additions.

these changes were generated by the command:

find include/ arch/*/bits -name '*.h' \
-exec sed -i '/^struct [^;{]*$/{N;s/\n/ /;}' {} +

and subsequently checked by hand to ensure that the regex did not pick
up any false positives.

the kernel ABI value for RUSAGE_CHILDREN is -1, not 1. the latter is
actually interpreted as RUSAGE_THREAD, to obtain values for just the
calling thread and not the whole process.

compilers are free not to copy, or in some cases to clobber, padding
bytes in a structure. while it's an aliasing violation, and thus
undefined behavior, to copy or manipulate other sockaddr types using
sockaddr_storage, it seems likely that traditional code attempts to do
so, and the original intent of the sockaddr_storage structure was
probably to allow such usage.

in the interest of avoiding silent and potentially dangerous breakage,
ensure that there are no actual padding bytes in sockaddr_storage by
moving and adjusting the size of the __ss_padding member so that it
fits exactly.

this change also removes a silent assumption that the alignment of
long is equal to its size.

kernel connection multiplexor macros AF_KCM, PF_KCM, SOL_KCM were
added in linux commit ab7ac4eb9832e32a09f4e8042705484d2fb0aad3

MSG_BATCH sendmsg flag for performance optimization was added
in linux commit f092276d85b82504e8a07498f4e9e0c51f06745c

SOL_* macros are now synced with linux socket.h which is not a uapi
header and glibc did not have the macros either, but that has changed
http://sourceware.org/ml/libc-alpha/2016-05/msg00322.html

new fields and associated linux commit:
tcpi_notsent_bytes, tcpi_min_rtt cd9b266095f422267bddbec88f9098b48ea548fc
tcpi_data_segs_in, tcpi_data_segs_out a44d6eacdaf56f74fad699af7f4925a5f5ac0e7f

flag for new cgroup namespace, added in linux commit
5e2bec7c2248ae27c5b16cd97215ae05c1d39179

x86 protection key faults are reported in the si_pkey field,
added in linux commit cd0ea35ff5511cde299a61c21a95889b4a71464e

ethertype for macsec added in linux commit
dece8d2b78d19df7fe5e4e965f1f0d1a3e188d1b

new socket option so application can give advice about routing
path quality of connected udp sockets, added in linux commit
a87cb3e48ee86d29868d3f59cfb9ce1a8fa63314

previously, the only way the stopping condition could be met with
correct lengths in the headers invoked undefined behavior, adding
sizeof(struct cmsghdr) beyond the end of the cmsg buffer.

instead, compute and compare sizes rather than pointers.

allows the os to free the marked pages lazily on memory pressure.
expected to increase malloc performance.
new in linux commit 854e9ed09dedf0c19ac8640e91bcc74bc3f9e5c9

new flag for exclusive wakeup mode when an event source fd is attached
to multiple epoll fds but they should not all receive the events.
new in linux commit df0108c5da561c66c333bb46bfe3c1fc65905898

new socket options for setting classic or extended BPF program
for sockets in a SO_REUSEPORT group.  added in linux commit
538950a1b7527a0a52ccd9337e3fcd304f027f13

new in linux commit 715f504b118998c41a2079a17e16bf5a8a114885
same as IP_HDRINCL but for SOL_IPV6 sockets.

currently five targets use the same mman.h constants and the rest
share most constants too, so move them to sys/mman.h before the
bits/mman.h include where the differences can be corrected by
redefinition of the macros.

this fixes two minor bugs: POSIX_MADV_DONTNEED was wrong on most
targets (it should be the same as MADV_DONTNEED), and sh defined
the x86-only MAP_32BIT mmap flag.

This is a GNU extension, but a fairly minor one, for a system call that
otherwise has no libc wrapper.

some software simply uses static_assert if the macro is defined, and
this breaks if the compiler does not recognize the _Static_assert
keyword used to define it.

commit 378f8cb5 added these functions
(as stubs) but left them without declarations. this broke some
autoconf based software that detected linkability of the symbols but
didn't check for a declaration.

si_errno and si_code are swapped in mips siginfo_t compared to other
archs and some si_code values are different.  This fix is required
for POSIX timers to work.

based on patch by Dmitry Ivanov.

only have code above the bits/signal.h include that is necessary.
(some types are used for the ucontext struct and mips has to
override a few macro definitions)

this way mips bits/signal.h will be able to affect siginfo_t.

allows the tracer to dump the bpf seccomp filters of the tracee,
new in linux v4.4, commit f8e529ed941ba2bbcbf310b575d968159ce7e895

they lock faulted pages into memory (useful when a small part of a
large mapped file needs efficient access), new in linux v4.4, commit
b0f205c2a3082dd9081f9a94e50658c5fa906ff1

MLOCK_* is not in the POSIX reserved namespace for sys/mman.h

allows a ptracer process to disable/enable seccomp filters of the
traced process, useful for checkpoint/restore, new in v4.3 commit
13c4a90119d28cfcb6b5bdd820c233b86c2b0237

ambient capability mask is new in linux v4.3, commit
58319057b7847667f0c9585b9de0e8932b0fdb08

IP_BIND_ADDRESS_NO_PORT is a SOL_IP socket option to delay src port
allocation until connect in case src ip is set with bind(port=0).
new in linux v4.2, commit 90c337da1524863838658078ec34241f45d8394d

IPPROTO_MPLS protocol number for mpls over ip.
new in linux v4.2, commit 730fc4371333636a00fed32c587fc1e85c5367e2

TCP_CC_INFO is a new socket option to get congestion control info without
netlink (union tcp_cc_info is in linux/inet_diag.h kernel header).
linux commit 6e9250f59ef9efb932c84850cd221f22c2a03c4a

TCP_SAVE_SYN, TCP_SAVED_SYN socket options are for saving and getting the
SYN headers of passive connections in a server application.
linux commit cd8ae85299d54155702a56811b2e035e63064d3d

Add new tcpi_* fields to struct tcp_info implementing RFC4898 counters.
linux commit 2efd055c53c06b7e89c167c98069bab9afce7e59