m_freebsd.c

unix系统下top命令的源代码

	    total_procs++;
	    process_states[(unsigned char) PP(pp, p_stat)]++;
	    if ((PP(pp, p_stat) != SZOMB) &&
		(show_idle || (PP(pp, p_pctcpu) != 0) || 
		 (PP(pp, p_stat) == SRUN)) &&
		(!show_uid || EP(pp, e_pcred.p_ruid) == (uid_t)sel->uid))
	    {
		*prefp++ = pp;
		active_procs++;
	    }
	}
    }

    /* if requested, sort the "interesting" processes */
    if (compare != NULL)
    {
	qsort((char *)pref, active_procs, sizeof(struct kinfo_proc *), compare);
    }

    /* remember active and total counts */
    si->p_total = total_procs;
    si->p_active = pref_len = active_procs;

    /* pass back a handle */
    handle.next_proc = pref;
    handle.remaining = active_procs;
    return((caddr_t)&handle);
}

char fmt[128];		/* static area where result is built */

char *format_next_process(handle, get_userid)

caddr_t handle;
char *(*get_userid)();

{
    register struct kinfo_proc *pp;
    register long cputime;
    register double pct;
    struct handle *hp;
    char status[16];
    int state;

    /* find and remember the next proc structure */
    hp = (struct handle *)handle;
    pp = *(hp->next_proc++);
    hp->remaining--;
    
    /* get the process's command name */
    if ((PP(pp, p_flag) & P_INMEM) == 0) {
	/*
	 * Print swapped processes as <pname>
	 */
	char *comm = PP(pp, p_comm);
#define COMSIZ sizeof(PP(pp, p_comm))
	char buf[COMSIZ];
	(void) strncpy(buf, comm, COMSIZ);
	comm[0] = '<';
	(void) strncpy(&comm[1], buf, COMSIZ - 2);
	comm[COMSIZ - 2] = '\0';
	(void) strncat(comm, ">", COMSIZ - 1);
	comm[COMSIZ - 1] = '\0';
    }

    /*
     * Convert the process's runtime from microseconds to seconds.  This
     * time includes the interrupt time although that is not wanted here.
     * ps(1) is similarly sloppy.
     */
    cputime = (PP(pp, p_runtime) + 500000) / 1000000;

    /* calculate the base for cpu percentages */
    pct = pctdouble(PP(pp, p_pctcpu));

    /* generate "STATE" field */
    switch (state = PP(pp, p_stat)) {
	case SRUN:
	    if (smpmode && PP(pp, p_oncpu) != 0xff)
		sprintf(status, "CPU%d", PP(pp, p_oncpu));
	    else
		strcpy(status, "RUN");
	    break;
	case SSLEEP:
	    if (PP(pp, p_wmesg) != NULL) {
		sprintf(status, "%.6s", EP(pp, e_wmesg));
		break;
	    }
	    /* fall through */
	default:

	    if (state >= 0 &&
	        state < sizeof(state_abbrev) / sizeof(*state_abbrev))
		    sprintf(status, "%.6s", state_abbrev[(unsigned char) state]);
	    else
		    sprintf(status, "?%5d", state);
	    break;
    }

    /* format this entry */
    sprintf(fmt,
	    smpmode ? smp_Proc_format : up_Proc_format,
	    PP(pp, p_pid),
	    namelength, namelength,
	    (*get_userid)(EP(pp, e_pcred.p_ruid)),
	    PP(pp, p_priority) - PZERO,

	    /*
	     * normal time      -> nice value -20 - +20 
	     * real time 0 - 31 -> nice value -52 - -21
	     * idle time 0 - 31 -> nice value +21 - +52
	     */
	    (PP(pp, p_rtprio.type) ==  RTP_PRIO_NORMAL ? 
	    	PP(pp, p_nice) - NZERO : 
	    	(RTP_PRIO_IS_REALTIME(PP(pp, p_rtprio.type)) ?
		    (PRIO_MIN - 1 - RTP_PRIO_MAX + PP(pp, p_rtprio.prio)) : 
		    (PRIO_MAX + 1 + PP(pp, p_rtprio.prio)))), 
	    format_k(PROCSIZE(pp)),
	    format_k(pagetok(VP(pp, vm_rssize))),
	    status,
	    smpmode ? PP(pp, p_lastcpu) : 0,
	    format_time(cputime),
	    100.0 * weighted_cpu(pct, pp),
	    100.0 * pct,
	    cmdlength,
	    printable(PP(pp, p_comm)));

    /* return the result */
    return(fmt);
}


/*
 * check_nlist(nlst) - checks the nlist to see if any symbols were not
 *		found.  For every symbol that was not found, a one-line
 *		message is printed to stderr.  The routine returns the
 *		number of symbols NOT found.
 */

static int check_nlist(nlst)

register struct nlist *nlst;

{
    register int i;

    /* check to see if we got ALL the symbols we requested */
    /* this will write one line to stderr for every symbol not found */

    i = 0;
    while (nlst->n_name != NULL)
    {
	if (nlst->n_type == 0)
	{
	    /* this one wasn't found */
	    (void) fprintf(stderr, "kernel: no symbol named `%s'\n",
			   nlst->n_name);
	    i = 1;
	}
	nlst++;
    }

    return(i);
}


/*
 *  getkval(offset, ptr, size, refstr) - get a value out of the kernel.
 *	"offset" is the byte offset into the kernel for the desired value,
 *  	"ptr" points to a buffer into which the value is retrieved,
 *  	"size" is the size of the buffer (and the object to retrieve),
 *  	"refstr" is a reference string used when printing error meessages,
 *	    if "refstr" starts with a '!', then a failure on read will not
 *  	    be fatal (this may seem like a silly way to do things, but I
 *  	    really didn't want the overhead of another argument).
 *  	
 */

static int getkval(offset, ptr, size, refstr)

unsigned long offset;
int *ptr;
int size;
char *refstr;

{
    if (kvm_read(kd, offset, (char *) ptr, size) != size)
    {
	if (*refstr == '!')
	{
	    return(0);
	}
	else
	{
	    fprintf(stderr, "top: kvm_read for %s: %s\n",
		refstr, strerror(errno));
	    quit(23);
	}
    }
    return(1);
}
    
/* comparison routines for qsort */

/*
 *  proc_compare - comparison function for "qsort"
 *	Compares the resource consumption of two processes using five
 *  	distinct keys.  The keys (in descending order of importance) are:
 *  	percent cpu, cpu ticks, state, resident set size, total virtual
 *  	memory usage.  The process states are ordered as follows (from least
 *  	to most important):  WAIT, zombie, sleep, stop, start, run.  The
 *  	array declaration below maps a process state index into a number
 *  	that reflects this ordering.
 */

static unsigned char sorted_state[] =
{
    0,	/* not used		*/
    3,	/* sleep		*/
    1,	/* ABANDONED (WAIT)	*/
    6,	/* run			*/
    5,	/* start		*/
    2,	/* zombie		*/
    4	/* stop			*/
};
 

#define ORDERKEY_PCTCPU \
  if (lresult = (long) PP(p2, p_pctcpu) - (long) PP(p1, p_pctcpu), \
     (result = lresult > 0 ? 1 : lresult < 0 ? -1 : 0) == 0)

#define ORDERKEY_CPTICKS \
  if ((result = PP(p2, p_runtime) > PP(p1, p_runtime) ? 1 : \
                PP(p2, p_runtime) < PP(p1, p_runtime) ? -1 : 0) == 0)

#define ORDERKEY_STATE \
  if ((result = sorted_state[(unsigned char) PP(p2, p_stat)] - \
                sorted_state[(unsigned char) PP(p1, p_stat)]) == 0)

#define ORDERKEY_PRIO \
  if ((result = PP(p2, p_priority) - PP(p1, p_priority)) == 0)

#define ORDERKEY_RSSIZE \
  if ((result = VP(p2, vm_rssize) - VP(p1, vm_rssize)) == 0) 

#define ORDERKEY_MEM \
  if ( (result = PROCSIZE(p2) - PROCSIZE(p1)) == 0 )

/* compare_cpu - the comparison function for sorting by cpu percentage */

int
#ifdef ORDER
compare_cpu(pp1, pp2)
#else
proc_compare(pp1, pp2)
#endif

struct proc **pp1;
struct proc **pp2;

{
    register struct kinfo_proc *p1;
    register struct kinfo_proc *p2;
    register int result;
    register pctcpu lresult;

    /* remove one level of indirection */
    p1 = *(struct kinfo_proc **) pp1;
    p2 = *(struct kinfo_proc **) pp2;

    ORDERKEY_PCTCPU
    ORDERKEY_CPTICKS
    ORDERKEY_STATE
    ORDERKEY_PRIO
    ORDERKEY_RSSIZE
    ORDERKEY_MEM
    ;

    return(result);
}

#ifdef ORDER
/* compare routines */
int compare_size(), compare_res(), compare_time(), compare_prio();

int (*proc_compares[])() = {
    compare_cpu,
    compare_size,
    compare_res,
    compare_time,
    compare_prio,
    NULL
};

/* compare_size - the comparison function for sorting by total memory usage */

int
compare_size(pp1, pp2)

struct proc **pp1;
struct proc **pp2;

{
    register struct kinfo_proc *p1;
    register struct kinfo_proc *p2;
    register int result;
    register pctcpu lresult;

    /* remove one level of indirection */
    p1 = *(struct kinfo_proc **) pp1;
    p2 = *(struct kinfo_proc **) pp2;

    ORDERKEY_MEM
    ORDERKEY_RSSIZE
    ORDERKEY_PCTCPU
    ORDERKEY_CPTICKS
    ORDERKEY_STATE
    ORDERKEY_PRIO
    ;

    return(result);
}

/* compare_res - the comparison function for sorting by resident set size */

int
compare_res(pp1, pp2)

struct proc **pp1;
struct proc **pp2;

{
    register struct kinfo_proc *p1;
    register struct kinfo_proc *p2;
    register int result;
    register pctcpu lresult;

    /* remove one level of indirection */
    p1 = *(struct kinfo_proc **) pp1;
    p2 = *(struct kinfo_proc **) pp2;

    ORDERKEY_RSSIZE
    ORDERKEY_MEM
    ORDERKEY_PCTCPU
    ORDERKEY_CPTICKS
    ORDERKEY_STATE
    ORDERKEY_PRIO
    ;

    return(result);
}

/* compare_time - the comparison function for sorting by total cpu time */

int
compare_time(pp1, pp2)

struct proc **pp1;
struct proc **pp2;

{
    register struct kinfo_proc *p1;
    register struct kinfo_proc *p2;
    register int result;
    register pctcpu lresult;
  
    /* remove one level of indirection */
    p1 = *(struct kinfo_proc **) pp1;
    p2 = *(struct kinfo_proc **) pp2;

    ORDERKEY_CPTICKS
    ORDERKEY_PCTCPU
    ORDERKEY_STATE
    ORDERKEY_PRIO
    ORDERKEY_RSSIZE
    ORDERKEY_MEM
    ;

      return(result);
  }
  
/* compare_prio - the comparison function for sorting by cpu percentage */

int
compare_prio(pp1, pp2)

struct proc **pp1;
struct proc **pp2;

{
    register struct kinfo_proc *p1;
    register struct kinfo_proc *p2;
    register int result;
    register pctcpu lresult;

    /* remove one level of indirection */
    p1 = *(struct kinfo_proc **) pp1;
    p2 = *(struct kinfo_proc **) pp2;

    ORDERKEY_PRIO
    ORDERKEY_CPTICKS
    ORDERKEY_PCTCPU
    ORDERKEY_STATE
    ORDERKEY_RSSIZE
    ORDERKEY_MEM
    ;

    return(result);
}
#endif

/*
 * proc_owner(pid) - returns the uid that owns process "pid", or -1 if
 *		the process does not exist.
 *		It is EXTREMLY IMPORTANT that this function work correctly.
 *		If top runs setuid root (as in SVR4), then this function
 *		is the only thing that stands in the way of a serious
 *		security problem.  It validates requests for the "kill"
 *		and "renice" commands.
 */

int proc_owner(pid)

int pid;

{
    register int cnt;
    register struct kinfo_proc **prefp;
    register struct kinfo_proc *pp;

    prefp = pref;
    cnt = pref_len;
    while (--cnt >= 0)
    {
	pp = *prefp++;	
	if (PP(pp, p_pid) == (pid_t)pid)
	{
	    return((int)EP(pp, e_pcred.p_ruid));
	}
    }
    return(-1);
}


/*
 * swapmode is based on a program called swapinfo written
 * by Kevin Lahey <[e-mail]>.
 */

#define	SVAR(var) __STRING(var)	/* to force expansion */
#define	KGET(idx, var)							\
	KGET1(idx, &var, sizeof(var), SVAR(var))
#define	KGET1(idx, p, s, msg)						\
	KGET2(nlst[idx].n_value, p, s, msg)
#define	KGET2(addr, p, s, msg)						\
	if (kvm_read(kd, (u_long)(addr), p, s) != s) {		        \
		warnx("cannot read %s: %s", msg, kvm_geterr(kd));       \
		return (0);                                             \
       }
#define	KGETRET(addr, p, s, msg)					\
	if (kvm_read(kd, (u_long)(addr), p, s) != s) {			\
		warnx("cannot read %s: %s", msg, kvm_geterr(kd));	\
		return (0);						\
	}


int
swapmode(retavail, retfree)
	int *retavail;
	int *retfree;
{
	int n;
	int pagesize = getpagesize();
	struct kvm_swap swapary[1];

	*retavail = 0;
	*retfree = 0;

#define CONVERT(v)	((quad_t)(v) * pagesize / 1024)

	n = kvm_getswapinfo(kd, swapary, 1, 0);
	if (n < 0 || swapary[0].ksw_total == 0)
		return(0);

	*retavail = CONVERT(swapary[0].ksw_total);
	*retfree = CONVERT(swapary[0].ksw_total - swapary[0].ksw_used);

	n = (int)((double)swapary[0].ksw_used * 100.0 /
	    (double)swapary[0].ksw_total);
	return(n);
}