Linux下面如何复制文件的函数代码：

修改版本，感谢网友yisheng2002 指出其中Bug!

#include <string> #include <fcntl.h> #include <sys/mman.h> using namespace std; bool copyfile(const string& srcfile, const string& destfile) {         int        fdin, fdout;         void        *src, *dst;         struct stat statbuf;         if ((fdin = open(srcfile.c_str(), O_RDONLY)) < 0)             return false;         if ((fdout = open(destfile.c_str(), O_RDWR | O_CREAT | O_TRUNC,           FILE_MODE)) < 0){             close(srcfile.c_str());             return false;         }         if (fstat(fdin, &statbuf) < 0)  /* need size of input file */             return false;         /* set size of output file */         if (lseek(fdout, statbuf.st_size - 1, SEEK_SET) == -1)             return false;         if (write(fdout, "", 1) != 1)             return false;         if ((src = mmap(0, statbuf.st_size, PROT_READ, MAP_SHARED,           fdin, 0)) == MAP_FAILED)             return false;         if ((dst = mmap(0, statbuf.st_size, PROT_READ | PROT_WRITE,           MAP_SHARED, fdout, 0)) == MAP_FAILED)             return false;         memcpy(dst, src, statbuf.st_size); /* does the file copy */         return true; }
参考：
http://topic.csdn.net/u/20071109/17/ad236653-c55c-4c09-bb27-1b7f14c75af1.html