Minix2.0/include/minix/const.h
/* Copyright (C) 1995 by Prentice-Hall, Inc. Permission is hereby granted
* to redistribute the binary and source programs of this system for
* educational or research purposes. For other use, written permission from
* Prentice-Hall is required.
*/
#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 static /* 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_t) 0 /* uid_t of superuser */
#define MAJOR 8 /* major device = (dev>>MAJOR) & 0377 */
#define MINOR 0 /* minor device = (dev>>MINOR) & 0377 */
#define NULL ((void *)0) /* null pointer */
#define CPVEC_NR 16 /* max # of entries in a SYS_VCOPY request */
#define NR_IOREQS MIN(NR_BUFS, 64)
/* maximum number of entries in an iorequest */
#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 */
/* 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 INET_PROC_NR 2 /* process number of the TCP/IP server */
#define INIT_PROC_NR (INET_PROC_NR + ENABLE_NETWORKING)
/* init -- the process that goes multiuser */
#define LOW_USER (INET_PROC_NR + ENABLE_NETWORKING)
/* first user not part of operating system */
/* Miscellaneous */
#define BYTE 0377 /* mask for 8 bits */
#define READING 0 /* copy data to user */
#define WRITING 1 /* copy data from user */
#define NO_NUM 0x8000 /* used as numerical argument to panic() */
#define NIL_PTR (char *) 0 /* generally useful expression */
#define HAVE_SCATTERED_IO 1 /* scattered I/O is now standard */
/* Macros. */
#define MAX(a, b) ((a) > (b) ? (a) : (b))
#define MIN(a, b) ((a) < (b) ? (a) : (b))
/* Number of tasks. */
#define NR_TASKS (9 + ENABLE_WINI + ENABLE_SCSI + ENABLE_CDROM \
+ ENABLE_NETWORKING + 2 * ENABLE_AUDIO)
/* Memory is allocated in clicks. */
#if (CHIP == INTEL)
#define CLICK_SIZE 256 /* unit in which memory is allocated */
#define CLICK_SHIFT 8 /* log2 of CLICK_SIZE */
#endif
#if (CHIP == SPARC) || (CHIP == M68000)
#define CLICK_SIZE 4096 /* unit in which memory is alocated */
#define CLICK_SHIFT 12 /* 2log of CLICK_SIZE */
#endif
#define click_to_round_k(n) \
((unsigned) ((((unsigned long) (n) << CLICK_SHIFT) + 512) / 1024))
#if CLICK_SIZE < 1024
#define k_to_click(n) ((n) * (1024 / CLICK_SIZE))
#else
#define k_to_click(n) ((n) / (CLICK_SIZE / 1024))
#endif
#define ABS -999 /* this process means absolute memory */
/* 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_NAMED_PIPE 0010000 /* named pipe (FIFO) */
#define I_SET_UID_BIT 0004000 /* set effective uid_t on exec */
#define I_SET_GID_BIT 0002000 /* set effective gid_t 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 */
/* Some limits. */
#define MAX_BLOCK_NR ((block_t) 077777777) /* largest block number */
#define HIGHEST_ZONE ((zone_t) 077777777) /* largest zone number */
#define MAX_INODE_NR ((ino_t) 0177777) /* largest inode number */
#define MAX_FILE_POS ((off_t) 037777777777) /* largest legal file offset */
#define NO_BLOCK ((block_t) 0) /* absence of a block number */
#define NO_ENTRY ((ino_t) 0) /* absence of a dir entry */
#define NO_ZONE ((zone_t) 0) /* absence of a zone number */
#define NO_DEV ((dev_t) 0) /* absence of a device numb */