m_freebsd20.c

查看系统硬件和内存资源使用情况；以及各个进程的使用情况

/*
 * top - a top users display for Unix
 *
 * SYNOPSIS:  For a FreeBSD-2.0 (4.4BSD) system
 *	      Note process resident sizes could be wrong, but ps shows
 *	      zero for them too..
 *
 * DESCRIPTION:
 * Originally written for BSD4.4 system by Christos Zoulas.
 * Ported to FreeBSD 2.0 by Steven Wallace && Wolfram Schneider
 *
 * This is the machine-dependent module for FreeBSD 2.x
 * Works for:
 *	FreeBSD 2.0
 *	FreeBSD 2.1.5
 *	FreeBSD 2.2
 *
 * LIBS: -lkvm
 *
 * CFLAGS: -DHAVE_GETOPT
 *
 * AUTHOR:  Christos Zoulas <[e-mail]>
 *          Steven Wallace  <[e-mail]>
 *          Wolfram Schneider <[e-mail]>
 *
 * $Id: machine.c,v 1.5 1995/01/06 02:04:39 swallace Exp $
 */



#define LASTPID      /**/  /* use last pid, compiler depended */
/* #define LASTPID_FIXED /**/ 
#define VM_REAL      /**/  /* use the same values as vmstat -s */
#define USE_SWAP     /**/  /* use swap usage (pstat -s), 
                              need to much cpu time */
/* #define DEBUG 1      /**/

#include <sys/types.h>
#include <sys/signal.h>
#include <sys/param.h>

#include "os.h"
#include <stdio.h>
#include <nlist.h>
#include <math.h>
#include <kvm.h>
#include <sys/errno.h>
#include <sys/sysctl.h>
#include <sys/dir.h>
#include <sys/dkstat.h>
#include <sys/file.h>
#include <sys/time.h>

#include <sys/vmmeter.h>
#include <sys/user.h>

#ifdef USE_SWAP
#include <stdlib.h>
#include <sys/rlist.h>
#include <sys/conf.h>
#endif

static int check_nlist __P((struct nlist *));
static int getkval __P((unsigned long, int *, int, char *));
extern char* printable __P((char *));

#include "top.h"
#include "machine.h"


/* get_process_info passes back a handle.  This is what it looks like: */

struct handle
{
    struct kinfo_proc **next_proc;	/* points to next valid proc pointer */
    int remaining;		/* number of pointers remaining */
};

/* declarations for load_avg */
#include "loadavg.h"

#define PP(pp, field) ((pp)->kp_proc . field)
#define EP(pp, field) ((pp)->kp_eproc . field)
#define VP(pp, field) ((pp)->kp_eproc.e_vm . field)

/* define what weighted cpu is.  */
#define weighted_cpu(pct, pp) (PP((pp), p_swtime) == 0 ? 0.0 : \
			 ((pct) / (1.0 - exp(PP((pp), p_swtime) * logcpu))))

/* what we consider to be process size: */
#define PROCSIZE(pp) (VP((pp), vm_tsize) + VP((pp), vm_dsize) + VP((pp), vm_ssize))

/* definitions for indices in the nlist array */


static struct nlist nlst[] = {
#define X_CCPU		0
    { "_ccpu" },		/* 0 */
#define X_CP_TIME	1
    { "_cp_time" },		/* 1 */
#define X_HZ		2
    { "_hz" },		        /* 2 */
#define X_STATHZ	3
    { "_stathz" },		/* 3 */
#define X_AVENRUN	4
    { "_averunnable" },		/* 4 */
#ifdef USE_SWAP
#define VM_SWAPLIST	5
	{ "_swaplist" },/* list of free swap areas */
#define VM_SWDEVT	6
	{ "_swdevt" },	/* list of swap devices and sizes */
#define VM_NSWAP	7
	{ "_nswap" },	/* size of largest swap device */
#define VM_NSWDEV	8
	{ "_nswdev" },	/* number of swap devices */
#define VM_DMMAX	9
	{ "_dmmax" },	/* maximum size of a swap block */
#endif
#ifdef VM_REAL
#ifdef USE_SWAP
#define X_CNT           10
#else
#define X_CNT           5
#endif
    { "_cnt" },		        /* struct vmmeter cnt */
#endif

#ifdef LASTPID
#if (defined USE_SWAP && defined VM_REAL)
#define X_LASTPID	11
#elif (defined VM_REAL)
#define X_LASTPID	6
#else
#define X_LASTPID       5
#endif
#ifdef LASTPID_FIXED
    { "_nextpid" },		
#else
    { "_nextpid.178" },		/* lastpid, compiler depended 
				 * should be changed 
				 * in /sys/kern/kern_fork.c */
#endif
#endif

    { 0 }
};

/*
 *  These definitions control the format of the per-process area
 */

static char header[] =
  "  PID X        PRI NICE   SIZE   RES STATE   TIME   WCPU    CPU COMMAND";
/* 0123456   -- field to fill in starts at header+6 */
#define UNAME_START 6

#define Proc_format \
	"%5d %-8.8s %3d %4d%7s %5s %-5s%7s %5.2f%% %5.2f%% %.14s"


/* process state names for the "STATE" column of the display */
/* the extra nulls in the string "run" are for adding a slash and
   the processor number when needed */

char *state_abbrev[] =
{
    "", "start", "run\0\0\0", "sleep", "stop", "zomb", "WAIT"
};


static kvm_t *kd;

/* values that we stash away in _init and use in later routines */

static double logcpu;

/* these are retrieved from the kernel in _init */

static          long hz;
static load_avg  ccpu;

/* these are offsets obtained via nlist and used in the get_ functions */

static unsigned long cp_time_offset;
static unsigned long avenrun_offset;
#ifdef LASTPID
static unsigned long lastpid_offset;
static long lastpid;
#endif
#ifdef VM_REAL
static unsigned long cnt_offset;
static long cnt;
#endif
/* these are for calculating cpu state percentages */

static long cp_time[CPUSTATES];
static long cp_old[CPUSTATES];
static long cp_diff[CPUSTATES];

/* these are for detailing the process states */

int process_states[7];
char *procstatenames[] = {
    "", " starting, ", " running, ", " sleeping, ", " stopped, ",
    " zombie, ", " ABANDONED, ",
    NULL
};

/* these are for detailing the cpu states */

int cpu_states[CPUSTATES];
char *cpustatenames[] = {
    "user", "nice", "system", "interrupt", "idle", NULL
};

/* these are for detailing the memory statistics */

int memory_stats[8];
char *memorynames[] = {
#ifndef VM_REAL
    "Real: ", "K/", "K ", "Virt: ", "K/",
    "K ", "Free: ", "K", NULL
#else
#if 0
    "K Act ", "K Inact ", "K Wired ", "K Free ", "% Swap, ",
    "K/", "K SWIO", 
#else
    "K Act ", "K Inact ", "K Wired ", "K Free ", "% Swap, ",
    "Kin ", "Kout", 
#endif
    NULL
#endif
};

/* these are for keeping track of the proc array */

static int nproc;
static int onproc = -1;
static int pref_len;
static struct kinfo_proc *pbase;
static struct kinfo_proc **pref;

/* these are for getting the memory statistics */

static int pageshift;		/* log base 2 of the pagesize */

/* define pagetok in terms of pageshift */

#define pagetok(size) ((size) << pageshift)

/* useful externals */
long percentages();

int
machine_init(statics)

struct statics *statics;

{
    register int i = 0;
    register int pagesize;

    if ((kd = kvm_open(NULL, NULL, NULL, O_RDONLY, "kvm_open")) == NULL)
	return -1;


    /* get the list of symbols we want to access in the kernel */
    (void) kvm_nlist(kd, nlst);
    if (nlst[0].n_type == 0)
    {
	fprintf(stderr, "top: nlist failed\n");
	return(-1);
    }

    /* make sure they were all found */
    if (i > 0 && check_nlist(nlst) > 0)
    {
	return(-1);
    }

    /* get the symbol values out of kmem */
    (void) getkval(nlst[X_STATHZ].n_value, (int *)(&hz), sizeof(hz), "!");
    if (!hz) {
	(void) getkval(nlst[X_HZ].n_value, (int *)(&hz), sizeof(hz),
		       nlst[X_HZ].n_name);
    }


#if (defined DEBUG)
    fprintf(stderr, "Hertz: %d\n", hz); 
#endif

    (void) getkval(nlst[X_CCPU].n_value,   (int *)(&ccpu),	sizeof(ccpu),
	    nlst[X_CCPU].n_name);

    /* stash away certain offsets for later use */
    cp_time_offset = nlst[X_CP_TIME].n_value;
    avenrun_offset = nlst[X_AVENRUN].n_value;
#ifdef LASTPID
    lastpid_offset =  nlst[X_LASTPID].n_value;
#endif
#ifdef VM_REAL
    cnt_offset = nlst[X_CNT].n_value;
#endif

    /* this is used in calculating WCPU -- calculate it ahead of time */
    logcpu = log(loaddouble(ccpu));

    pbase = NULL;
    pref = NULL;
    nproc = 0;
    onproc = -1;
    /* get the page size with "getpagesize" and calculate pageshift from it */
    pagesize = getpagesize();
    pageshift = 0;
    while (pagesize > 1)
    {
	pageshift++;
	pagesize >>= 1;
    }

    /* we only need the amount of log(2)1024 for our conversion */
    pageshift -= LOG1024;

    /* fill in the statics information */
    statics->procstate_names = procstatenames;
    statics->cpustate_names = cpustatenames;
    statics->memory_names = memorynames;

    /* all done! */
    return(0);
}

char *format_header(uname_field)

register char *uname_field;

{
    register char *ptr;

    ptr = header + UNAME_START;
    while (*uname_field != '\0')
    {
	*ptr++ = *uname_field++;
    }

    return(header);
}

static int swappgsin = -1;
static int swappgsout = -1;
extern struct timeval timeout;

void
get_system_info(si)

struct system_info *si;

{
    long total;
    load_avg avenrun[3];

    /* get the cp_time array */
    (void) getkval(cp_time_offset, (int *)cp_time, sizeof(cp_time),
		   nlst[X_CP_TIME].n_name);
    (void) getkval(avenrun_offset, (int *)avenrun, sizeof(avenrun),
		   nlst[X_AVENRUN].n_name);

#ifdef LASTPID
    (void) getkval(lastpid_offset, (int *)(&lastpid), sizeof(lastpid),
		   "!");
#endif

    /* convert load averages to doubles */
    {
	register int i;
	register double *infoloadp;
	load_avg *avenrunp;

#ifdef notyet
	struct loadavg sysload;
	int size;
	getkerninfo(KINFO_LOADAVG, &sysload, &size, 0);
#endif

	infoloadp = si->load_avg;
	avenrunp = avenrun;
	for (i = 0; i < 3; i++)
	{
#ifdef notyet
	    *infoloadp++ = ((double) sysload.ldavg[i]) / sysload.fscale;
#endif
	    *infoloadp++ = loaddouble(*avenrunp++);
	}
    }

    /* convert cp_time counts to percentages */
    total = percentages(CPUSTATES, cpu_states, cp_time, cp_old, cp_diff);

    /* sum memory statistics */
    {

#ifndef VM_REAL
	struct vmtotal total;
	int size = sizeof(total);
	static int mib[] = { CTL_VM, VM_METER };

	/* get total -- systemwide main memory usage structure */
	if (sysctl(mib, 2, &total, &size, NULL, 0) < 0) {
	    (void) fprintf(stderr, "top: sysctl failed: %s\n", strerror(errno));
	    bzero(&total, sizeof(total));
	}
	/* convert memory stats to Kbytes */
	memory_stats[0] = -1;
	memory_stats[1] = pagetok(total.t_arm);
	memory_stats[2] = pagetok(total.t_rm);
	memory_stats[3] = -1;
	memory_stats[4] = pagetok(total.t_avm);
	memory_stats[5] = pagetok(total.t_vm);
	memory_stats[6] = -1;
	memory_stats[7] = pagetok(total.t_free);
    }
#else
	struct vmmeter sum;
	static unsigned int swap_delay = 0;

        (void) getkval(cnt_offset, (int *)(&sum), sizeof(sum),
		   "_cnt");

	/* convert memory stats to Kbytes */
	memory_stats[0] = pagetok(sum.v_active_count);
	memory_stats[1] = pagetok(sum.v_inactive_count);
	memory_stats[2] = pagetok(sum.v_wire_count);
	memory_stats[3] = pagetok(sum.v_free_count);

        if (swappgsin < 0) {
	    memory_stats[5] = 0;
	    memory_stats[6] = 0;
	} else {
	    memory_stats[5] = pagetok(((sum.v_swappgsin - swappgsin)));
	    memory_stats[6] = pagetok(((sum.v_swappgsout - swappgsout)));
	}
        swappgsin = sum.v_swappgsin;
	swappgsout = sum.v_swappgsout;

#ifdef USE_SWAP
        if ((memory_stats[5] > 0 || memory_stats[6]) > 0 || swap_delay == 0) {
	    memory_stats[4] = swapmode();
	}
        swap_delay++;
#else
        memory_stats[4] = 0;