fcntl(socket, F_SETFL, fcntl(s, F_GETFL) | O_NONBLOCK);

nb = 1;
ioctl(s, FIONBIO, &nb);

signal(SIGIO, &input_handler); /* dummy sample; sigaction(  ) is better */
fcntl(STDIN_FILENO, F_SETOWN, getpid(  ));
oflags = fcntl(STDIN_FILENO, F_GETFL);
fcntl(STDIN_FILENO, F_SETFL, oflags | FASYNC);

#include <stdio.h>  
#include <stdlib.h>  
#include <unistd.h>  
#include <fcntl.h>  
#include <errno.h>  
#include <netinet/in.h>       /*socket address struct*/  
#include <arpa/inet.h>            /*host to network convertion*/  
#include <sys/socket.h>  
#include <sys/types.h>  
#include <signal.h>  
#include <sys/ioctl.h>  
#define MAX_TRANSPORT_LENTH 512  

static int g_var = 0;
static int g_skt = 0;
void sig_handler(int signum)
{
  char  buf[MAX_TRANSPORT_LENTH+1] = "";
  int len = 0;
  len = read(g_skt,buf,MAX_TRANSPORT_LENTH);
  if (len<0)
  {
      perror("Read socket failed");
      exit(-1);
  }
  else
  {
      printf("In SIGIO handler,got msg:%s\n",buf);
  }
}

int main()
{
  struct sockaddr_in addr;
  memset(&addr,0,sizeof(addr));
  addr.sin_family =  AF_INET;
  addr.sin_addr.s_addr = INADDR_ANY;
  addr.sin_port = htons(50001);

  signal(SIGIO,sig_handler);

  g_skt = socket(AF_INET,SOCK_DGRAM,0);
  if(g_skt == -1)
  {
      perror("Create socket failed");
      exit(-1);
  }

  int len = sizeof(addr);
  int ret = 0;

  int on = 1;
  ret = fcntl(g_skt, F_SETOWN, getpid());//Set process or process group ID to receive SIGIO signals  
  if(-1 == ret)
  {
      perror("Fcntl F_SETOWN failed");
      exit(-1);
  }
  ret = ioctl(g_skt, FIOASYNC, &on);
  if(-1 == ret)
  {
      perror("Fcntl FIOASYNC failed");
      exit(-1);
  }
  ret = ioctl(g_skt, FIONBIO, &on);
  if(-1 == ret)
  {
      perror("ioctl FIONBIO failed");
      exit(-1);
  }

  ret = bind(g_skt,(struct sockaddr *)&addr,sizeof(addr));
  if(-1 == ret)
  {
      perror("Bind socket failed");
      exit(-1);
  }
  while(1)
  {
      printf("I am running\n");
      sleep(2);
  }
  close(g_skt);
}

#include <stdio.h>  
#include <stdlib.h>  
#include <unistd.h>  
#include <fcntl.h>  
#include <errno.h>  
#include <netinet/in.h>       /*socket address struct*/  
#include <arpa/inet.h>            /*host to network convertion*/  
#include <sys/socket.h>  
#include <signal.h>  
#define MAX_TRANSPORT_LENTH 512  

int main()
{
  struct sockaddr_in addr;
  memset(&addr,0,sizeof(addr));
  addr.sin_family =  AF_INET;
  addr.sin_addr.s_addr = inet_addr("192.168.1.106");
  addr.sin_port = htons(50001);

  int sock;
  sock = socket(AF_INET,SOCK_DGRAM,0);
  if(sock == -1)
  {
      perror("Create socket failed");
      exit(-1);
  }

  int ret;
  ret = connect(sock,(struct sockaddr *)&addr,sizeof(addr));
  if(ret == -1)
  {
      perror("Connect socket failed");
      exit(-1);
  }
  while(1)
  {
      printf("Will send messge to server\n");
      write(sock,"Some unknown infomation\n",MAX_TRANSPORT_LENTH);
      sleep(1);
  }

}

tar -xvf apache-nutch-2.1.tar.gz

<property>
 <name>storage.data.store.class</name>
  <value>org.apache.gora.hbase.store.HBaseStore</value>
   <description>Default class for storing data</description>
   </property>

 <!-- Uncomment this to use HBase as Gora backend. -->

       <dependency org="org.apache.gora" name="gora-hbase" rev="0.2" conf="*->default" />

gora.datastore.default=org.apache.gora.hbase.store.HBaseStore

ant

cd runtime/local/bin
nutch inject ../urls
nutch readdb

for(;;){
  event = get_next_event();
  handle_event(event);
}

# This is a comment line.

my-plugin.so junk.example.com trash.example.org garbage.example.edu
some-plugin.so arg1 arg2 $proxy.config.http.cache.on

Container<T>::iterator it;
for (it = container.begin(); it != container.end(); ++it) {
  if (N == X)
      container.erase(it);
}

std::list< int>::iterator itList;
for( itList = List.begin(); itList != List.end(); )
{
  if( WillDelete( *itList) )
  {
      itList = List.erase( itList);
  }
  else
      itList++;
}

std::list< int>::iterator itList;
for( itList = List.begin(); itList != List.end(); )
{
  if( WillDelete( *itList) )
  {
      List.erase( itList++);
  }
  else
      itList++;
}

std::list< int> List;
std::list< int>::iterator itList;
for( itList = List.begin(); itList != List.end(); itList++)
{
  if( WillDelete( *itList) )
  {
      List.erase( itList);
  }
}

std::list< int> List;
std::list< int>::iterator itList;
for( itList = List.begin(); itList != List.end(); )
{
  if( WillDelete( *itList) )
  {
      itList = List.erase( ++itList);
  }
  else
      itList++;
}

iterator erase(iterator position)
{
  if (position + 1 != end())
      copy(position + 1, finish, position);  // 后续元素往前移动
  --finish;
  destroy(finish); // 一个释放资源的全局函数
  return position;
}

std::vector< int> Vec;
std::vector< int>::iterator itVec;
for( itVec = Vec.begin(); itVec != Vec.end(); )
{
  if( WillDelete( *itVec) )
  {
      itVec = Vec.erase( itVec);
  }
  else
      itList++;
}

tar -xvf hbase-0.94.1.tar.gz
cd hbase-0.94.1

<?xml version="1.0"?>
<?xml-stylesheet type="text/xsl" href="configuration.xsl"?>
<configuration>
<property>
<name>hbase.rootdir</name>
<value>file:///DIRECTORY/hbase</value>
</property>
</configuration>

./bin/start-hbase.sh
starting master, logging to /home/hadoop/hbase-0.94.1/bin/../logs/hbase-hadoop-master-localhost.out

hadoop@localhost:~/hbase-0.94.1$ ./bin/hbase shell
HBase Shell; enter 'help<RETURN>' for list of supported commands.
Type "exit<RETURN>" to leave the HBase Shell
Version 0.94.1, r1365210, Tue Jul 24 18:40:10 UTC 2012

hbase(main):001:0>

hadoop@localhost:~/hbase-0.94.1$ ./bin/hbase shell
HBase Shell; enter 'help<RETURN>' for list of supported commands.
Type "exit<RETURN>" to leave the HBase Shell
Version 0.94.1, r1365210, Tue Jul 24 18:40:10 UTC 2012

hbase(main):001:0> create 'test','cf'
0 row(s) in 4.4750 seconds

hbase(main):002:0> list 'test'
TABLE
test                                                                                                                                         
1 row(s) in 0.1360 seconds

hbase(main):003:0> put 'test', 'row1', 'cf:a', 'value1'
0 row(s) in 0.3430 seconds

hbase(main):004:0> put 'test', 'row2', 'cf:b', 'value2'
0 row(s) in 0.0720 seconds

hbase(main):015:0> put 'test', 'row3', 'cf:c', 'value3'
0 row(s) in 0.0250 seconds

hbase(main):016:0> scan 'test'
ROW                                  COLUMN+CELL
row1                                column=cf:a, timestamp=1348043456231, value=value1
row2                                column=cf:b, timestamp=1348043476312, value=value2
row3                                column=cf:c, timestamp=1348043612383, value=value3
row(s) in 0.1310 seconds

hbase(main):017:0> get 'test', 'row1'
COLUMN                               CELL
 cf:a                                timestamp=1348043456231, value=value1
 1 row(s) in 0.0560 seconds

hbase(main):018:0> disable 'test'
0 row(s) in 2.2520 seconds

hbase(main):019:0> drop 'test'
0 row(s) in 1.6390 seconds

hbase(main):018:0> disable 'test'
0 row(s) in 2.2520 seconds

hbase(main):019:0> drop 'test'
0 row(s) in 1.6390 seconds

hbase(main):020:0> exit
hadoop@localhost:~/hbase-0.94.1$ ./bin/stop-hbase.sh
stopping hbase.................
hadoop@localhost:~/hbase-0.94.1$ 

#include "build/build_config.h"

// The entry point for all invocations of Chromium, browser and renderer. On
// windows, this does nothing but load chrome.dll and invoke its entry point in
// order to make it easy to update the app from GoogleUpdate. We don't need
// that extra layer with on linux.

extern "C" {
  int ChromeMain(int argc, const char** argv);
}

int main(int argc, const char** argv) {
    return ChromeMain(argc, argv);
}

#include "chrome/app/chrome_main_delegate.h"

#include "content/public/app/content_main.h"

#if defined(OS_WIN)
#define DLLEXPORT __declspec(dllexport)

// We use extern C for the prototype DLLEXPORT to avoid C++ name mangling.
extern "C" {
DLLEXPORT int __cdecl ChromeMain(HINSTANCE instance,
sandbox::SandboxInterfaceInfo* sandbox_info);
}
#elif defined(OS_POSIX)
extern "C" {
__attribute__((visibility("default")))
int ChromeMain(int argc, const char** argv);
}
#endif

#if defined(OS_WIN)
DLLEXPORT int __cdecl ChromeMain(HINSTANCE instance,
sandbox::SandboxInterfaceInfo* sandbox_info) {
ChromeMainDelegate chrome_main_delegate;
return content::ContentMain(instance, sandbox_info, &chrome_main_delegate);
#elif defined(OS_POSIX)
int ChromeMain(int argc, const char** argv) {
ChromeMainDelegate chrome_main_delegate;
return content::ContentMain(argc, argv, &chrome_main_delegate);
#endif
}

#include "content/public/app/content_main.h"

#include "base/memory/scoped_ptr.h"
#include "content/public/app/content_main_runner.h"

namespace content {

#if defined(OS_WIN)
int ContentMain(HINSTANCE instance,
                sandbox::SandboxInterfaceInfo* sandbox_info,
                              ContentMainDelegate* delegate) {
#else
  int ContentMain(int argc,
                  const char** argv,
                                  ContentMainDelegate* delegate) {
#endif  // OS_WIN

        scoped_ptr<ContentMainRunner> main_runner(ContentMainRunner::Create());

          int exit_code;

#if defined(OS_WIN)
  exit_code = main_runner->Initialize(instance, sandbox_info, delegate);
#else
    exit_code = main_runner->Initialize(argc, argv, delegate);
#endif  // OS_WIN

    if (exit_code >= 0)
            return exit_code;

              exit_code = main_runner->Run();

                main_runner->Shutdown();

                  return exit_code;
  }

}  // namespace content