|
|
|
The data types defined in the include file are used in the system code; some data of these types are accessible to user code:
/*
* Copyright (c) 1982, 1986 Regents of the University of California.
* All rights reserved. The Berkeley software License Agreement
* specifies the terms and conditions for redistribution.
*/
#ifndef _TYPES_
#define _TYPES_
/*
* Basic system types.
*/
#include <sys/sysmacros.h>
typedef unsigned char u_char;
typedef unsigned short u_short;
typedef unsigned int u_int;
typedef unsigned long u_long;
typedef unsigned short ushort; /* System V compatibility */
typedef unsigned int uint; /* System V compatibility */
#ifdef vax
typedef struct _physadr { int r[1]; } *physadr;
typedef struct label_t {
int val[14];
} label_t;
#endif
#ifdef mc68000
typedef struct _physadr { short r[1]; } *physadr;
typedef struct label_t {
int val[13];
} label_t;
#endif
#ifdef sparc
typedef struct _physadr { int r[1]; } *physadr;
typedef struct label_t {
int val[2];
} label_t;
#endif
#ifdef i386
typedef struct _physadr { short r[1]; } *physadr;
typedef struct label_t {
int val[8];
} label_t;
#endif
typedef struct _quad { long val[2]; } quad;
typedef long daddr_t;
typedef char * caddr_t;
typedef u_long ino_t;
typedef long swblk_t;
typedef int size_t;
typedef long time_t;
typedef short dev_t;
typedef long off_t;
typedef u_short uid_t;
typedef u_short gid_t;
typedef long key_t;
#define NBBY 8 /* number of bits in a byte */
/*
* Select uses bit masks of file descriptors in longs.
* These macros manipulate such bit fields (the filesystem macros use chars).
* FD_SETSIZE may be defined by the user, but the default here
* should be >= NOFILE (param.h).
*/
#ifndef FD_SETSIZE
#define FD_SETSIZE 256
#endif
typedef long fd_mask;
#define NFDBITS (sizeof(fd_mask) * NBBY) /* bits per mask */
#ifndef howmany
#ifdef sun386
#define howmany(x, y) ((((u_int)(x))+(((u_int)(y))-1))/((u_int)(y)))
#else
#define howmany(x, y) (((x)+((y)-1))/(y))
#endif
#endif
typedef struct fd_set {
fd_mask fds_bits[howmany(FD_SETSIZE, NFDBITS)];
} fd_set;
typedef char * addr_t;
#define FD_SET(n, p) ((p)->fds_bits[(n)/NFDBITS] |= (1 << ((n) % NFDBITS)))
#define FD_CLR(n, p) ((p)->fds_bits[(n)/NFDBITS] &= ~(1 << ((n) % NFDBITS)))
#define FD_ISSET(n, p) ((p)->fds_bits[(n)/NFDBITS] & (1 << ((n) % NFDBITS)))
#define FD_ZERO(p) bzero((char *)(p), sizeof(*(p)))
#ifdef sparc
/*
* routines that call setjmp have strange control flow graphs,
* since a call to a routine that calls resume/longjmp will eventually
* return at the setjmp site, not the original call site. This
* utterly wrecks control flow analysis.
*/
extern int setjmp();
#pragma unknown_control_flow(setjmp)
#endif sparc
#endif _TYPES_
The form daddr_t is used for disk addresses, see fs.5 Times are encoded in seconds since 00:00:00 GMT, January 1, 1970. The major and minor parts of a device code specify kind and unit number of a device and are installation-dependent. Offsets are measured in bytes from the beginning of a file. The label_t variables are used to save the processor state while another process is running.
|
|
|
Created by unroff & hp-tools. © somebody (See intro for details). All Rights Reserved. Last modified 11/5/97