file.h

一个简单的操作系统minix的核心代码

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				src/fs/file.h	 	 
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20300	/* This is the filp table.  It is an intermediary between file descriptors and
20301	 * inodes.  A slot is free if filp_count == 0.
20302	 */
20303	
20304	EXTERN struct filp {
20305	  mode_t filp_mode;             /* RW bits, telling how file is opened */
20306	  int filp_flags;               /* flags from open and fcntl */
20307	  int filp_count;               /* how many file descriptors share this slot?*/
20308	  struct inode *filp_ino;       /* pointer to the inode */
20309	  off_t filp_pos;               /* file position */
20310	} filp[NR_FILPS];
20311	
20312	#define FILP_CLOSED     0       /* filp_mode: associated device closed */
20313	
20314	#define NIL_FILP (struct filp *) 0      /* indicates absence of a filp slot */