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