Programming the UNIX™ System by M. R. M. Dunsmuir
By M. R. M. Dunsmuir
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Per Process Data Space .......... Inode Table -- File Table .......... . 2. 2. summarises the interrelationship of inode, file and per-process open file tables. The open system call serves to allocate these structures, the close routine, to deallocate them. The Dynamics of File I/O Now that we have examined the function of the data structures concerned with file I/O. we shall consider how access 52 Programming the UNIX System to these, via read and write system calls, translates into real I/O.
3. Files The philosophy of Ritchie ~ Thompson was that the UNIX system should provide the user with a carefully chosen set of complementary services without the complications of unnecessary and restrictive features. This has produced a system of great power and elegance, and nowhere is this more clearly seen than in the design of the UNIX file interface. In this chapter we will explore the structure of the files themselves; chapters 4 and 5 discuss the programming facilities provided for their manipulation.
In inode *1 13 • define NAPI 1* Number of physical block nos . in indo block *1 • define NAPS 128 1* inode index of single indirect block # *1 #define IX1 10 1* inode index of double indirect block # *1 #define IX2 11 1* inode index of triple indirect block # *1 #define IX3 12 int pmap{fd, ip, lb) int fd, lb; struct dinode tip; { long di_map[NAPI]; 1* blocks extracted from inode *1 long dd_map(NAPB1; 13tol{di_map, ip->di_addr. NAPI); if( lb < OIRO ) 1* direct block *1 return{di_map(lb]); < DIR1 ){ 1* Read the indirect block *1 if( Ib Ib -: DIRO; lseek(fd.