libsysutils: Add iovec/runOnEachSocket

SocketClient:
* Replace sendDataLocked with sendDataLockedv which takes an iovec.
* Add a version of sendData, sendDatav, which takes an iovec.
* do not preserve iovec content through sendDatav

SocketListener:
* Add runOnEachSocket, which allows to to specify a SocketClientCommand to
  run individually on each socket. This allows you to do broadcast-like
  actions customized for each individual socket.
* Client safe list reference counting for sendBroadcast & runOnEach Socket

(cherry picked from commit a6e965578e44f8ae5f98de822ba5decec381d5fc)

Signed-off-by: Nick Kralevich <nnk@google.com>
Signed-off-by: Mark Salyzyn <salyzyn@google.com>

Change-Id: I716f89c01b4cb7af900045c7e41fac1492defb06
libsysutils: Get rid of warnings

- UNUSED argument warnings
- Remove LOG_NDEBUG define

(cherry picked from commit 696f267ff5a1e6227c2f5784dae60c190e0228b8)

Change-Id: I48b0942adfdb7a46a7693e580bc6ed5a685b0d5b
libsysutils: SocketListener export release

* Foreground thread (legacy) closes connection by
  reporting false return value for onDataAvailable.
* Background thread can choose instead to close the
  connection asynchronously by calling release, must
  return true for the onDataAvailable method.

(cherry picked from commit d7ad4e409eaac53db3a9789060097b712850b337)

Change-Id: I70ab37d5c22b02804aa3b4dfb26cc9b75291f8b6
libsysutil: frequent native crash /system/bin/vold

regression from commit a6e965578e44f9ae5f98de822ba5decec381dffc

* wrap writev with sigaction SIG_IGN SIGPIPE to emulate the
  send(,,,MSG_NOSIGNAL) call it had replaced.

(cherry pick from commit 83fc720785c4e40f3341daf7c0bf5ee99261fee9)

BUG: 12796279
Change-Id: I14363630ada79c0a5b85bb6b2afd0a1c4d5c3109
Fix assertion failure

Adding 0 items to vector causes assertion failure in _grow -> itemLocation

Change-Id: Ief232a9c12e2e43ee6c87a7a137fe8a94aa741d4
Unicode: Fix mismatched type initialization

Fixes the following:
system/core/libutils/Unicode.cpp:579:27: error: cannot initialize a variable of type 'const uint16_t *const' (aka 'const
unsigned short *const') with an rvalue of type 'char16_t *'
    const uint16_t* const u16end = dst + dstLen;
                          ^        ~~~~~~~~~~~~

Change-Id: I6b1c64d69bb78faeb0e7ae7b08afe05f426c7532
ueventd: fix a busy loop while reading uevents

Under certain conditions, poll() may raise the POLLERR
flag along with POLLIN, in which case the check for
(ufd.revents == POLLIN) results in an endless busy loop.

The following fix was applied to
hardware/libhardware_legacy/uevent/uevent.c
to fix a similar bug:

  commit 3aabb260ceef10377c31c9e45fb239247f5cfeba
  Author: Mathias Agopian <mathias@google.com>
  Date:   Mon Oct 1 14:53:18 2012 -0700

    fix a typo in uevent_next_eventi

    Bug: 7114973
    Change-Id: I15a4c714b59aeb1d02db00517d70b5f0e5ab22c2

Applying the same fix for two more poll loops in init
and ueventd.

https://android.googlesource.com/platform/hardware/libhardware_legacy.git/+/3aabb260ceef10377c31c9e45fb239247f5cfeba
Signed-off-by: houst0nn <houstonn@gmail.com>
Change-Id: I50693f6d3c904992ac4b8a9a14a83c7106e6b9e0