m_dynix32.c

unix系统下top命令的源代码

/*
 * top - a top users display for Unix
 *
 * SYNOPSIS:  any Sequent Running Dynix 3.2.x
 *
 * DESCRIPTION:
 * This is the machine-dependent module for Sequent Dynix 3.2.0
 * This makes top work on the following systems:
 *	Dynix 3.2.0 and perhaps later versions
 *
 * CFLAGS: -DBSD
 *
 * AUTHOR:  Daniel Trinkle <[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 <machine/pte.h>
#include <machine/plocal.h>
#include <machine/engine.h>
#include <sys/file.h>

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

#ifndef uid_t
/* some early versions of DYNIX don't have uid_t */
#define uid_t int
#endif

#ifndef pid_t
/* ditto pid_t */
#define pid_t short
#endif

struct engine *engine;
struct engine *pengine;
struct plocal **pplocal;
int Nengine;

/* 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 */
typedef long load_avg;
typedef long pctcpu;
#define loaddouble(la) ((double)(la) / FSCALE)
#define intload(i) ((int)((i) * FSCALE))
#define pctdouble(p) ((double)(p) / FSCALE)

/* 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_dsize + (pp)->p_ssize)

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

static struct nlist nlst[] = {
    { "_avenrun" },		/* 0 */
    { "_ccpu" },		/* 1 */
    { "_mpid" },		/* 2 */
    { "_nproc" },		/* 3 */
    { "_proc" },		/* 4 */
    { "_total" },		/* 5 */
    { "_engine" },		/* 6 */
    { "_Nengine" },		/* 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", "start", "zomb", "stop", "RUN"
};

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

static double logcpu;

#define VMUNIX "/dynix"
#define KMEM "/dev/kmem"
#define MEM "/dev/mem"

static int kmem = -1;
static int mem = -1;

struct vmtotal total;

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

static unsigned long proc;
static          int  nproc;
static load_avg  ccpu;

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

static unsigned long mpid_offset;
static unsigned long avenrun_offset;
static unsigned long total_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[8];
char *procstatenames[] = {
    "", " sleeping, ", " ABANDONED, ", " runable, ", " starting, ",
    " zombie, ", " stopped, ", " running, ",
    NULL
};

/* these are for detailing the cpu states */

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

/* these are for detailing the memory statistics */

int memory_stats[5];
char *memorynames[] = {
    "K (", "K) real, ", "K (", "K) virtual, ", "K free", 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;

#define pagetok(size)	((size) << (PGSHIFT - LOG1024))

/* useful externals */
extern int errno;
extern char *sys_errlist[];

long lseek();

machine_init(statics)

struct statics *statics;

{
    register int i;

    /* open kernel memory */
    if ((kmem = open(KMEM, 0)) < 0)
    {
	perror(KMEM);
	exit(20);
    }
    if ((mem = open(MEM, 0)) < 0)
    {
	perror(MEM);
	exit(21);
    }

    /* get the list of symbols we want to access in the kernel */
    if ((i = nlist(VMUNIX, nlst)) < 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_CCPU].n_value,   (int *)(&ccpu),	sizeof(ccpu),
	    nlst[X_CCPU].n_name);
    (void) getkval(nlst[X_NENGINE].n_value,  &Nengine,  sizeof(int),
	    nlst[X_NENGINE].n_name);
    (void) getkval(nlst[X_ENGINE].n_value,  &pengine,  sizeof(struct engine *),
	    nlst[X_ENGINE].n_name);

    engine = (struct engine *)calloc(Nengine, sizeof(struct engine));
    if (engine == NULL)
    {
	fprintf(stderr, "Cannot allocate memory for engine structure\n");
	exit(2);
    }
    (void) getkval(pengine,  &engine[0],  Nengine * sizeof(struct engine),
	    "engine array");
    pplocal = (struct plocal **)calloc(Nengine, sizeof(struct plocal *));
    if (pplocal == NULL)
    {
	fprintf(stderr, "Cannot allocate memory for plocal structures\n");
	exit(2);
    }
    for (i = 0; i < Nengine; i++) {
	pplocal[i] = (struct plocal *)&engine[i].e_local->pp_local[0][0];
    }

    /* 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;

    /* 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);
    }

    /* 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];
    struct plocal plocal;
    register int i, j;

    /* get the cp_time array */
    for (j = 0; j < CPUSTATES; j++)
	cp_time[j] = 0L;
    for (i = 0; i < Nengine; i++) {
	(void) getkval(pplocal[i], &plocal, sizeof(struct plocal), "plocal array");
	for (j = 0; j < CPUSTATES; j++)
	    cp_time[j] += (long)plocal.cnt.v_time[j];
    }

    /* 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 */
    (void) percentages(CPUSTATES, cpu_states, cp_time, cp_old, cp_diff);

    /* get total -- systemwide main memory usage structure */
    (void) getkval(total_offset, (int *)(&total), sizeof(total),
		   "_total");
    /* convert memory stats to Kbytes */
    memory_stats[0] = pagetok(total.t_rm);
    memory_stats[1] = pagetok(total.t_arm);
    memory_stats[2] = pagetok(total.t_vm);
    memory_stats[3] = pagetok(total.t_avm);
    memory_stats[4] = 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;