filp - mathfur/minix GitHub Wiki

呼出元

read_write

概要

• servers/vfs/file.hにて定義
• ファイルポジション、モードを持つ
• ロックが出来る

実装

EXTERN struct filp {
  mode_t filp_mode;		/* ビット列。ファイルの開き方? */
  u64_t filp_pos;		/* file position */

  int filp_flags;		/* flags from open and fcntl */
  int filp_state;		/* state for crash recovery */
  int filp_count;		/* ファイルディスクリプタ何個が使用しているか? */
  struct vnode *filp_vno;	/* vnode belonging to this file */
  mutex_t filp_lock;		/* lock to gain exclusive access */
  struct fproc *filp_softlock;	/* if not NULL; this filp didn't lock the
				 * vnode. Another filp already holds a lock
				 * for this thread */

  /* the following fields are for select() and are owned by the generic
   * select() code (i.e., fd-type-specific select() code can't touch these).
   */
  int filp_selectors;		/* select()ing processes blocking on this fd */
  int filp_select_ops;		/* interested in these SEL_* operations */
  int filp_select_flags;	/* Select flags for the filp */

  /* following are for fd-type-specific select() */
  int filp_pipe_select_ops;
} filp[NR_FILPS];

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