9664ba0c4f
Added interface to select() for pipes (also named pipes), and select() stubs for regular files. Added timer library in FS that select() is the first customer of. This is unfinished, but committed anyway to get a new release out to Al and testers.
25 lines
958 B
C
25 lines
958 B
C
/* This is the filp table. It is an intermediary between file descriptors and
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* inodes. A slot is free if filp_count == 0.
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*/
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EXTERN struct filp {
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mode_t filp_mode; /* RW bits, telling how file is opened */
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int filp_flags; /* flags from open and fcntl */
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int filp_count; /* how many file descriptors share this slot?*/
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struct inode *filp_ino; /* pointer to the inode */
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off_t filp_pos; /* file position */
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/* the following fields are for select() and are owned by the generic
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* select() code (i.e., fd-type-specific select() code can't touch these).
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*/
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int filp_selectors; /* select()ing processes blocking on this fd */
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int filp_select_ops; /* interested in these SEL_* operations */
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/* following are for fd-type-specific select() */
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int filp_pipe_select_ops;
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} filp[NR_FILPS];
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#define FILP_CLOSED 0 /* filp_mode: associated device closed */
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#define NIL_FILP (struct filp *) 0 /* indicates absence of a filp slot */
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