Minix1.1/usr/src/h/const.h
/* Copyright (C) 1987 by Prentice-Hall, Inc. Permission is hereby granted to
* private individuals and educational institutions to modify and
* redistribute the binary and source programs of this system to other
* private individuals and educational institutions for educational and
* research purposes. For corporate or commercial use, permission from
* Prentice-Hall is required. In general, such permission will be granted,
* subject to a few conditions.
*/
#define EXTERN extern /* used in *.h files */
#define PRIVATE static /* PRIVATE x limits the scope of x */
#define PUBLIC /* PUBLIC is the opposite of PRIVATE */
#define FORWARD /* some compilers require this to be 'static' */
#define TRUE 1 /* used for turning integers into Booleans */
#define FALSE 0 /* used for turning integers into Booleans */
#define HZ 60 /* clock freq (software settable on IBM-PC) */
#define BLOCK_SIZE 1024 /* # bytes in a disk block */
#define SUPER_USER (uid) 0 /* uid of superuser */
#define MAJOR 8 /* major device = (dev>>MAJOR) & 0377 */
#define MINOR 0 /* minor device = (dev>>MINOR) & 0377 */
#define NR_TASKS 8 /* number of tasks in the transfer vector */
#define NR_PROCS 16 /* number of slots in proc table */
#define NR_SEGS 3 /* # segments per process */
#define T 0 /* proc[i].mem_map[T] is for text */
#define D 1 /* proc[i].mem_map[D] is for data */
#define S 2 /* proc[i].mem_map[S] is for stack */
#define MAX_P_LONG 2147483647 /* maximum positive long, i.e. 2**31 - 1 */
/* Memory is allocated in clicks. */
#define CLICK_SIZE 0020 /* unit in which memory is allocated */
#define CLICK_SHIFT 4 /* log2 of CLICK_SIZE */
/* Process numbers of some important processes */
#define MM_PROC_NR 0 /* process number of memory manager */
#define FS_PROC_NR 1 /* process number of file system */
#define INIT_PROC_NR 2 /* init -- the process that goes multiuser */
#define LOW_USER 2 /* first user not part of operating system */
/* Miscellaneous */
#define BYTE 0377 /* mask for 8 bits */
#define TO_USER 0 /* flag telling to copy from fs to user */
#define FROM_USER 1 /* flag telling to copy from user to fs */
#define READING 0 /* copy data to user */
#define WRITING 1 /* copy data from user */
#define ABS -999 /* this process means absolute memory */
#define WORD_SIZE 2 /* number of bytes per word */
#define NIL_PTR (char *) 0 /* generally useful expression */
#define NO_NUM 0x8000 /* used as numerical argument to panic() */
#define MAX_PATH 128 /* max length of path names */
#define SIG_PUSH_BYTES 8 /* how many bytes pushed by signal */
#define MAX_ISTACK_BYTES 1024 /* maximum initial stack size for EXEC */
/* Device numbers of root (RAM) and boot (fd0) devices. */
#define ROOT_DEV (dev_nr) 256 /* major-minor device number of root dev */
#define BOOT_DEV (dev_nr) 512 /* major-minor device number of boot diskette */
/* Flag bits for i_mode in the inode. */
#define I_TYPE 0170000 /* this field gives inode type */
#define I_REGULAR 0100000 /* regular file, not dir or special */
#define I_BLOCK_SPECIAL 0060000 /* block special file */
#define I_DIRECTORY 0040000 /* file is a directory */
#define I_CHAR_SPECIAL 0020000 /* character special file */
#define I_SET_UID_BIT 0004000 /* set effective uid on exec */
#define I_SET_GID_BIT 0002000 /* set effective gid on exec */
#define ALL_MODES 0006777 /* all bits for user, group and others */
#define RWX_MODES 0000777 /* mode bits for RWX only */
#define R_BIT 0000004 /* Rwx protection bit */
#define W_BIT 0000002 /* rWx protection bit */
#define X_BIT 0000001 /* rwX protection bit */
#define I_NOT_ALLOC 0000000 /* this inode is free */