ubuntu 上 新建大文件 超过2G

  
  
 
 

   
   
  
  /*
   
   
  
  *
 author lx
 date 3.24 2011
 contact [e-mail]
 biref cp a big file to anthor file.

   
   
  
  */
   
   
  
  

#include 
   
   
  
  <
   
   
  
  sys
   
   
  
  /
   
   
  
  types.h
   
   
  
  >
   
   
  
  
#include 
   
   
  
  <
   
   
  
  sys
   
   
  
  /
   
   
  
  stat.h
   
   
  
  >
   
   
  
  
#include 
   
   
  
  <
   
   
  
  fcntl.h
   
   
  
  >
   
   
  
  
#include 
   
   
  
  <
   
   
  
  stdlib.h
   
   
  
  >
   
   
  
  
#include 
   
   
  
  <
   
   
  
  unistd.h
   
   
  
  >
   
   
  
  
#include 
   
   
  
  <
   
   
  
  stdio.h
   
   
  
  >
   
   
  
  
#include 
   
   
  
  <
   
   
  
  errno.h
   
   
  
  >
   
   
  
  
#include 
   
   
  
  <
   
   
  
  string
   
   
  
  .h
   
   
  
  >
   
   
  
  


   
   
  
  #define
   
   
  
   BUFFSIZE 8192
   
   
  
  


   
   
  
  int
   
   
  
   main( 
   
   
  
  void
   
   
  
   )
{

   
   
  
  int
   
   
  
   id_write, id_read;

 id_write 
   
   
  
  =
   
   
  
   open( 
   
   
  
  "
   
   
  
  temp.pcap
   
   
  
  "
   
   
  
  , O_WRONLY 
   
   
  
  |
   
   
  
   O_APPEND 
   
   
  
  |
   
   
  
   O_CREAT );
 id_read 
   
   
  
  =
   
   
  
   open( 
   
   
  
  "
   
   
  
  lx03.pcap
   
   
  
  "
   
   
  
  , O_RDONLY );


   
   
  
  int
   
   
  
   n;

   
   
  
  char
   
   
  
   buf[BUFFSIZE];

   
   
  
  while
   
   
  
   ( ( n 
   
   
  
  =
   
   
  
   read( id_read, buf, BUFFSIZE ) ) 
   
   
  
  >
   
   
  
   
   
   
  
  0
   
   
  
   )
 {

   
   
  
  if
   
   
  
   ( write( id_write, buf, n ) 
   
   
  
  !=
   
   
  
   n )
 fprintf( stderr, 
   
   
  
  "
   
   
  
  error is %s\n
   
   
  
  "
   
   
  
  , strerror(errno) );
 } 


   
   
  
  if
   
   
  
   ( n 
   
   
  
  <
   
   
  
   
   
   
  
  0
   
   
  
   )
 printf( 
   
   
  
  "
   
   
  
  read error\n
   
   
  
  "
   
   
  
   );

 close( id_write );
 close( id_read ); 

 exit( 
   
   
  
  0
   
   
  
   );
}　　　　　　　　　　　　　
  
  
 
 
  
  
 
 

   
   
  
  

  
  
 
 
  
  
 
 

   
   
  
  编译的时候：g++ -o opencp  -D_FILE_OFFSET_BITS=64 -g opencp.cpp