file_ptr_info_example.c

linux下的程序开发（C语言实现）：本程序主要实现文件的操作

#include<stdio.h>
#include<string.h>
#include<stdlib.h>
#define prt(CONTENT,MSG) printf(CONTENT":\t%p\n",MSG)

int main(int argc , char ** argv )
{
	FILE *fp ;
	char *p="test\n";
	if(( fp = ( FILE *) fopen ( "ftest.txt","a+") ) == NULL ){
		perror("file open failure!");
		return(0);
	}
	fwrite(p,strlen(p),1,fp);
	printf("int flags:%d\n",fp->_flags);
	
	prt("_IO_read_ptr",fp->_IO_read_ptr);
	prt("_IO_read_end",fp->_IO_read_end);
	prt("_IO_read_base",fp->_IO_read_base);
	
	prt("_IO_write_ptr",fp->_IO_write_ptr);
	prt("_IO_write_base",fp->_IO_write_base);
	prt("_IO_write_end",fp->_IO_write_end);
	
	prt("_IO_buf_base",fp->_IO_buf_base);
	prt("_IO_buf_end",fp->_IO_buf_end);
	
	fclose(fp);
	return(0);
}