Merge "Fetch peer credentials for local sockets" into gingerbread

#include "../../../frameworks/base/include/utils/List.h"

#include <pthread.h>

#include <sys/types.h>

class SocketClient {

    int             mSocket;

    pthread_mutex_t mWriteMutex;

    /* Peer process ID */

    pid_t mPid;

    /* Peer user ID */

    uid_t mUid;

    /* Peer group ID */

    gid_t mGid;

public:

    SocketClient(int sock);

    virtual ~SocketClient() {}

    int getSocket() { return mSocket; }

    pid_t getPid() const { return mPid; }

    uid_t getUid() const { return mUid; }

    gid_t getGid() const { return mGid; }

    int sendMsg(int code, const char *msg, bool addErrno);

    int sendMsg(const char *msg);

#include <alloca.h>

#include <errno.h>

#include <sys/socket.h>

#include <sys/types.h>

#include <pthread.h>

#include <string.h>

#include <sysutils/SocketClient.h>

SocketClient::SocketClient(int socket) {

    mSocket = socket;

SocketClient::SocketClient(int socket)

        : mSocket(socket)

        , mPid(-1)

        , mUid(-1)

        , mGid(-1)

{

    pthread_mutex_init(&mWriteMutex, NULL);

    struct ucred creds;

    socklen_t szCreds = sizeof(creds);

    memset(&creds, 0, szCreds);

    int err = getsockopt(socket, SOL_SOCKET, SO_PEERCRED, &creds, &szCreds);

    if (err == 0) {

        mPid = creds.pid;

        mUid = creds.uid;

        mGid = creds.gid;

    }

}

int SocketClient::sendMsg(int code, const char *msg, bool addErrno) {