proc.h

基于组件方式开发操作系统的OSKIT源代码

#define	p_endcopy	p_thread

	void	*p_thread;	/* Id for this "thread"; Mach glue. XXX */
	struct	user *p_addr;	/* Kernel virtual addr of u-area (PROC ONLY). */
	struct	mdproc p_md;	/* Any machine-dependent fields. */

	u_short	p_xstat;	/* Exit status for wait; also stop signal. */
	u_short	p_acflag;	/* Accounting flags. */
	struct	rusage *p_ru;	/* Exit information. XXX */
};

#define	p_session	p_pgrp->pg_session
#define	p_pgid		p_pgrp->pg_id

/*
 * Status values.
 *
 * A note about SRUN and SONPROC: SRUN indicates that a process is
 * runnable but *not* yet running, i.e. is on a run queue.  SONPROC
 * indicates that the process is actually executing on a CPU, i.e.
 * it is no longer on a run queue.
 */
#define	SIDL	1		/* Process being created by fork. */
#define	SRUN	2		/* Currently runnable. */
#define	SSLEEP	3		/* Sleeping on an address. */
#define	SSTOP	4		/* Process debugging or suspension. */
#define	SZOMB	5		/* Awaiting collection by parent. */
#define	SDEAD	6		/* Process is almost a zombie. */
#define	SONPROC	7		/* Process is currently on a CPU */

#define	P_ZOMBIE(p)	((p)->p_stat == SZOMB || (p)->p_stat == SDEAD)

/* These flags are kept in p_flag. */
#define	P_ADVLOCK	0x00001	/* Process may hold a POSIX advisory lock. */
#define	P_CONTROLT	0x00002	/* Has a controlling terminal. */
#define	P_INMEM		0x00004	/* Loaded into memory. */
#define	P_NOCLDSTOP	0x00008	/* No SIGCHLD when children stop. */
#define	P_PPWAIT	0x00010	/* Parent is waiting for child to exec/exit. */
#define	P_PROFIL	0x00020	/* Has started profiling. */
#define	P_SELECT	0x00040	/* Selecting; wakeup/waiting danger. */
#define	P_SINTR		0x00080	/* Sleep is interruptible. */
#define	P_SUGID		0x00100	/* Had set id privileges since last exec. */
#define	P_SYSTEM	0x00200	/* System proc: no sigs, stats or swapping. */
#define	P_TIMEOUT	0x00400	/* Timing out during sleep. */
#define	P_TRACED	0x00800	/* Debugged process being traced. */
#define	P_WAITED	0x01000	/* Debugging process has waited for child. */
#define	P_WEXIT		0x02000	/* Working on exiting. */
#define	P_EXEC		0x04000	/* Process called exec. */
#define	P_OWEUPC	0x08000	/* Owe process an addupc() call at next ast. */
#define	P_FSTRACE	0x10000	/* Debugger process being traced by procfs */
#define	P_NOCLDWAIT	0x20000	/* No zombies if child dies */
#define	P_32		0x40000	/* 32-bit process (used on 64-bit kernels) */
#define P_BIGLOCK	0x80000 /* Process needs kernel "big lock" to run */


/*
 * Macro to compute the exit signal to be delivered.
 */
#define	P_EXITSIG(p)	(((p)->p_flag & (P_TRACED|P_FSTRACE)) ? SIGCHLD : \
			 p->p_exitsig)

/*
 * MOVE TO ucred.h?
 *
 * Shareable process credentials (always resident).  This includes a reference
 * to the current user credentials as well as real and saved ids that may be
 * used to change ids.
 */
struct	pcred {
	struct	ucred *pc_ucred;	/* Current credentials. */
	uid_t	p_ruid;			/* Real user id. */
	uid_t	p_svuid;		/* Saved effective user id. */
	gid_t	p_rgid;			/* Real group id. */
	gid_t	p_svgid;		/* Saved effective group id. */
	int	p_refcnt;		/* Number of references. */
};

LIST_HEAD(proclist, proc);		/* a list of processes */

/*
 * This structure associates a proclist with its lock.
 */
struct proclist_desc {
	struct proclist *pd_list;	/* the list */
	/*
	 * XXX Add a pointer to the proclist's lock eventually.
	 */
};

#ifdef _KERNEL
/*
 * We use process IDs <= PID_MAX; PID_MAX + 1 must also fit in a pid_t,
 * as it is used to represent "no process group".
 */
#define	PID_MAX		30000
#define	NO_PID		30001

#define SESS_LEADER(p)	((p)->p_session->s_leader == (p))
#define	SESSHOLD(s)	((s)->s_count++)
#define	SESSRELE(s) {							\
	if (--(s)->s_count == 0)					\
		FREE(s, M_SESSION);					\
}

#define	PHOLD(p) {							\
	if ((p)->p_holdcnt++ == 0 && ((p)->p_flag & P_INMEM) == 0)	\
		uvm_swapin(p);						\
}
#define	PRELE(p)	(--(p)->p_holdcnt)

/*
 * Flags passed to fork1().
 */
#define	FORK_PPWAIT	0x01		/* block parent until child exit */
#define	FORK_SHAREVM	0x02		/* share vmspace with parent */
#define	FORK_SHARECWD	0x04		/* share cdir/rdir/cmask */
#define	FORK_SHAREFILES	0x08		/* share file descriptors */
#define	FORK_SHARESIGS	0x10		/* share signal actions */

#define	PIDHASH(pid)	(&pidhashtbl[(pid) & pidhash])
extern LIST_HEAD(pidhashhead, proc) *pidhashtbl;
extern u_long pidhash;

#define	PGRPHASH(pgid)	(&pgrphashtbl[(pgid) & pgrphash])
extern LIST_HEAD(pgrphashhead, pgrp) *pgrphashtbl;
extern u_long pgrphash;

#ifdef OSKIT
#include "oskit_uvm_vmspace.h"
#else
/*
 * Allow machine-dependent code to override curproc in <machine/cpu.h> for
 * its own convenience.  Otherwise, we declare it as appropriate.
 */
#if !defined(curproc)
#if defined(MULTIPROCESSOR)
#define	curproc	curcpu()->ci_curproc	/* Current running proc. */
#else
extern struct proc *curproc;		/* Current running proc. */
#endif /* MULTIPROCESSOR */
#endif /* ! curproc */

extern struct proc proc0;		/* Process slot for swapper. */
#endif /*OSKIT*/
extern int nprocs, maxproc;		/* Current and max number of procs. */

/* Process list lock; see kern_proc.c for locking protocol details. */
extern struct lock proclist_lock;

extern struct proclist allproc;		/* List of all processes. */
extern struct proclist zombproc;	/* List of zombie processes. */

extern struct proclist deadproc;	/* List of dead processes. */
extern struct simplelock deadproc_slock;

extern struct proc *initproc;		/* Process slots for init, pager. */

extern const struct proclist_desc proclists[];

extern struct pool proc_pool;		/* memory pool for procs */
extern struct pool pcred_pool;		/* memory pool for pcreds */
extern struct pool plimit_pool;		/* memory pool for plimits */
extern struct pool rusage_pool;		/* memory pool for rusages */

struct proc *pfind __P((pid_t));	/* Find process by id. */
struct pgrp *pgfind __P((pid_t));	/* Find process group by id. */

struct simplelock;

int	chgproccnt __P((uid_t uid, int diff));
int	enterpgrp __P((struct proc *p, pid_t pgid, int mksess));
void	fixjobc __P((struct proc *p, struct pgrp *pgrp, int entering));
int	inferior __P((struct proc *p, struct proc *q));
int	leavepgrp __P((struct proc *p));
void	yield __P((void));
void	preempt __P((struct proc *));
void	mi_switch __P((struct proc *));
void	pgdelete __P((struct pgrp *pgrp));
void	procinit __P((void));
void	remrunqueue __P((struct proc *));
void	resetpriority __P((struct proc *));
void	setrunnable __P((struct proc *));
void	setrunqueue __P((struct proc *));
void	suspendsched __P((void));
int	ltsleep __P((void *chan, int pri, const char *wmesg, int timo,
	    __volatile struct simplelock *));
#ifdef OSKIT
void	unsleep __P((struct lwp *));
#else
void	unsleep __P((struct proc *));
#endif
void	wakeup __P((void *chan));
void	wakeup_one __P((void *chan));
void	reaper __P((void *));
void	exit1 __P((struct proc *, int));
void	exit2 __P((struct proc *));
int	fork1 __P((struct proc *, int, int, void *, size_t,
	    void (*)(void *), void *, register_t *, struct proc **));
void	rqinit __P((void));
int	groupmember __P((gid_t, struct ucred *));
void	cpu_switch __P((struct proc *));
void	cpu_wait __P((struct proc *));
void	cpu_exit __P((struct proc *));
void	cpu_fork __P((struct proc *, struct proc *, void *, size_t,
	    void (*)(void *), void *));

void	child_return __P((void *));

int	proc_isunder __P((struct proc *, struct proc*));

void	proclist_lock_read __P((void));
void	proclist_unlock_read __P((void));
int	proclist_lock_write __P((void));
void	proclist_unlock_write __P((int));
void	p_sugid __P((struct proc*));

/* Compatbility with old, non-interlocked tsleep call. */
#define	tsleep(chan, pri, wmesg, timo)					\
	ltsleep(chan, pri, wmesg, timo, NULL)

#if defined(MULTIPROCESSOR)
void	proc_trampoline_mp(void);	/* XXX */
#endif

#endif	/* _KERNEL */
#endif	/* !_SYS_PROC_H_ */