35 lines
1.1 KiB
C
35 lines
1.1 KiB
C
#ifndef _LINUX_PIPE_FS_I_H
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#define _LINUX_PIPE_FS_I_H
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struct pipe_inode_info {
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struct wait_queue * wait;
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char * base;
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unsigned int start;
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unsigned int len;
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unsigned int lock;
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unsigned int rd_openers;
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unsigned int wr_openers;
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unsigned int readers;
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unsigned int writers;
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};
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#define PIPE_WAIT(inode) ((inode).u.pipe_i.wait)
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#define PIPE_BASE(inode) ((inode).u.pipe_i.base)
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#define PIPE_START(inode) ((inode).u.pipe_i.start)
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#define PIPE_LEN(inode) ((inode).u.pipe_i.len)
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#define PIPE_RD_OPENERS(inode) ((inode).u.pipe_i.rd_openers)
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#define PIPE_WR_OPENERS(inode) ((inode).u.pipe_i.wr_openers)
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#define PIPE_READERS(inode) ((inode).u.pipe_i.readers)
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#define PIPE_WRITERS(inode) ((inode).u.pipe_i.writers)
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#define PIPE_LOCK(inode) ((inode).u.pipe_i.lock)
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#define PIPE_SIZE(inode) PIPE_LEN(inode)
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#define PIPE_EMPTY(inode) (PIPE_SIZE(inode)==0)
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#define PIPE_FULL(inode) (PIPE_SIZE(inode)==PIPE_BUF)
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#define PIPE_FREE(inode) (PIPE_BUF - PIPE_LEN(inode))
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#define PIPE_END(inode) ((PIPE_START(inode)+PIPE_LEN(inode))&\
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(PIPE_BUF-1))
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#define PIPE_MAX_RCHUNK(inode) (PIPE_BUF - PIPE_START(inode))
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#define PIPE_MAX_WCHUNK(inode) (PIPE_BUF - PIPE_END(inode))
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#endif
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