c/c++文件相关

取的文件大小

1. int fd = open("data.txt",O_RDONLY);

int len = lseek(fd,0,SEEK_END);

2. struct stat sb;  

if ((fstat(fd, &sb)) == -1) { 

perror("fstat");
}

sb.st_size

3.

 if ((mapped = (char *)mmap(NULL, sb.st_size, PROT_READ |   

                    PROT_WRITE, MAP_PRIVATE, fd, 0)) == (void *)-1) {  

        perror("mmap");  

    }  

1.  if ((mapped = (char *)mmap(NULL, sb.st_size, PROT_READ |   
2.                     PROT_WRITE, MAP_PRIVATE, fd, 0)) == (void *)-1) {  
3.         perror("mmap");  
4.     }  

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