m_bsd43.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:  any generic 4.3BSD system
 *
 * DESCRIPTION:
 * This is the machine-dependent module for BSD4.3 
 * Works for:
 *      4.3 BSD
 *	AOS4.3,	IBM rt/pc
 *	mtXinu, vax
 *
 * LIBS: 
 *
 * AUTHOR:  Christos Zoulas <[e-mail]>
 */

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

#include <stdio.h>
#include <nlist.h>
#include <math.h>
#include <sys/dir.h>
#include <sys/user.h>
#include <sys/proc.h>
#include <sys/dk.h>
#include <sys/vm.h>
#include <sys/file.h>
#include <sys/time.h>
#include <machine/pte.h>


#define DOSWAP

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

extern int errno, sys_nerr;
extern char *sys_errlist[];
#define strerror(e) (((e) >= 0 && (e) < sys_nerr) ? sys_errlist[(e)] : "Unknown error")

#define VMUNIX	"/vmunix"
#define KMEM	"/dev/kmem"
#define MEM	"/dev/mem"
#ifdef DOSWAP
#define SWAP	"/dev/drum"
#endif

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

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

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

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

/* what we consider to be process size: */
#define PROCSIZE(pp) ((pp)->p_tsize + (pp)->p_dsize + (pp)->p_ssize)

/* definitions for indices in the nlist array */
#define X_AVENRUN	0
#define X_CCPU		1
#define X_NPROC		2
#define X_PROC		3
#define X_TOTAL		4
#define X_CP_TIME	5
#define X_MPID		6
#define X_HZ		7

static struct nlist nlst[] = {
    { "_avenrun" },		/* 0 */
    { "_ccpu" },		/* 1 */
    { "_nproc" },		/* 2 */
    { "_proc" },		/* 3 */
    { "_total" },		/* 4 */
    { "_cp_time" },		/* 5 */
    { "_mpid" },		/* 6 */
    { "_hz" },			/* 7 */
    { 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 %5s %5s %-5s %6s %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[] =
{
    "", "sleep", "WAIT", "run\0\0\0", "start", "zomb", "stop"
};


static int kmem, mem;
#ifdef DOSWAP
static int swap;
#endif

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

static double logcpu;

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

static unsigned long proc;
static          int  nproc;
static          long hz;
static load_avg  ccpu;
static          int  ncpu = 0;

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

static unsigned long avenrun_offset;
static unsigned long mpid_offset;
static unsigned long total_offset;
static unsigned long cp_time_offset;

/* 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[] = {
    "", " sleeping, ", " ABANDONED, ", " running, ", " starting, ",
    " zombie, ", " stopped, ",
    NULL
};

/* these are for detailing the cpu states */

int cpu_states[4];
char *cpustatenames[] = {
    "user", "nice", "system", "idle", NULL
};

/* these are for detailing the memory statistics */

int memory_stats[8];
char *memorynames[] = {
    "Real: ", "K/", "K act/tot  ", "Virtual: ", "K/",
    "K act/tot  ", "Free: ", "K", NULL
};

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

static int bytes;
static int pref_len;
static struct proc *pbase;
static struct 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 */
extern int errno;
extern char *sys_errlist[];

long lseek();
long time();

machine_init(statics)

struct statics *statics;

{
    register int i = 0;
    register int pagesize;

    if ((kmem = open(KMEM, O_RDONLY)) == -1) {
	perror(KMEM);
	return(-1);
    }
    if ((mem = open(MEM, O_RDONLY)) == -1) {
	perror(MEM);
	return(-1);
    }

#ifdef DOSWAP
    if ((swap = open(SWAP, O_RDONLY)) == -1) {
	perror(SWAP);
	return(-1);
    }
#endif

    /* get the list of symbols we want to access in the kernel */
    (void) nlist(VMUNIX, 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_PROC].n_value,   (int *)(&proc),	sizeof(proc),
	    nlst[X_PROC].n_name);
    (void) getkval(nlst[X_NPROC].n_value,  &nproc,		sizeof(nproc),
	    nlst[X_NPROC].n_name);
    (void) getkval(nlst[X_HZ].n_value,     (int *)(&hz),	sizeof(hz),
	    nlst[X_HZ].n_name);
    (void) getkval(nlst[X_CCPU].n_value,   (int *)(&ccpu),	sizeof(ccpu),
	    nlst[X_CCPU].n_name);

    /* stash away certain offsets for later use */
    mpid_offset = nlst[X_MPID].n_value;
    avenrun_offset = nlst[X_AVENRUN].n_value;
    total_offset = nlst[X_TOTAL].n_value;
    cp_time_offset = nlst[X_CP_TIME].n_value;

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

    /* allocate space for proc structure array and array of pointers */
    bytes = nproc * sizeof(struct proc);
    pbase = (struct proc *)malloc(bytes);
    pref  = (struct proc **)malloc(nproc * sizeof(struct proc *));

    /* Just in case ... */
    if (pbase == (struct proc *)NULL || pref == (struct proc **)NULL)
    {
	fprintf(stderr, "top: can't allocate sufficient memory\n");
	return(-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);
}

get_system_info(si)

struct system_info *si;

{
    load_avg avenrun[3];
    long total;

    /* get the cp_time array */
    (void) getkval(cp_time_offset, (int *)cp_time, sizeof(cp_time),
		   "_cp_time");

    /* get load average array */
    (void) getkval(avenrun_offset, (int *)avenrun, sizeof(avenrun),
		   "_avenrun");

    /* get mpid -- process id of last process */
    (void) getkval(mpid_offset, &(si->last_pid), sizeof(si->last_pid),
		   "_mpid");

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

	infoloadp = si->load_avg;
	sysloadp = avenrun;
	for (i = 0; i < 3; i++)
	{
	    *infoloadp++ = loaddouble(*sysloadp++);
	}
    }

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

    /* sum memory statistics */
    {
	struct vmtotal total;

	/* get total -- systemwide main memory usage structure */
	(void) getkval(total_offset, (int *)(&total), sizeof(total),
		       "_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);
    }

    /* set arrays and strings */
    si->cpustates = cpu_states;
    si->memory = memory_stats;
}

static struct handle handle;

caddr_t get_process_info(si, sel, compare)

struct system_info *si;
struct process_select *sel;
int (*compare)();

{
    register int i;
    register int total_procs;
    register int active_procs;
    register struct proc **prefp;
    register struct proc *pp;

    /* these are copied out of sel for speed */
    int show_idle;
    int show_system;
    int show_uid;
    int show_command;

    /* read all the proc structures in one fell swoop */
    (void) getkval(proc, (int *)pbase, bytes, "proc array");

    /* get a pointer to the states summary array */
    si->procstates = process_states;

    /* set up flags which define what we are going to select */
    show_idle = sel->idle;
    show_system = sel->system;
    show_uid = sel->uid != -1;
    show_command = sel->command != NULL;