m_mtxinu.c

unix系统下top命令的源代码

/*
 * top - a top users display for Unix
 *
 * SYNOPSIS:  any VAX Running Mt. Xinu MORE/bsd
 *
 * DESCRIPTION:
 * This is the machine-dependent module for Mt. Xinu MORE/bsd
 * This makes top work on the following systems:
 *      Mt. Xinu MORE/bsd
 *
 * CFLAGS: -Dpid_t=int -DORDER
 *
 * 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 <sys/file.h>
#include <machine/pte.h>

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

/* 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)

/* process time is only available in u area, so retrieve it from u.u_ru and
   store a copy in unused (by top) p_mmsize field of struct proc
   struct timeval field tv_sec is a long, p_mmsize is an int, but both are the
   same size on VAX and MIPS, so this is safe */
#define PROCTIME(pp) ((pp)->p_mmsize)

/* 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_MPID          2
#define X_NPROC         3
#define X_PROC          4
#define X_TOTAL         5
#define X_CP_TIME       6

static struct nlist nlst[] = {
    { "_avenrun" },             /* 0 */
    { "_ccpu" },                /* 1 */
    { "_mpid" },                /* 2 */
    { "_nproc" },               /* 3 */
    { "_proc" },                /* 4 */
    { "_total" },               /* 5 */
    { "_cp_time" },             /* 6 */
    { 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"
};

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

static double logcpu;

#define VMUNIX "/vmunix"
#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;
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[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 names given to allowed sorting orders -- first is default */
char *ordernames[] =
{"cpu", "size", "res", "time", NULL};

/* forward definitions for comparison functions */
int compare_cpu();
int compare_size();
int compare_res();
int compare_time();

int (*proc_compares[])() = {
    compare_cpu,
    compare_size,
    compare_res,
    compare_time,
    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) >> (LOG1024 - PGSHIFT))

/* 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);

    /* 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);
    }

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

    /* 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];

    /* 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 */
    (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;
    register struct user u;

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

    /* 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;

    /* count up process states and get pointers to interesting procs */
    total_procs = 0;
    active_procs = 0;
    bzero((char *)process_states, sizeof(process_states));
    prefp = pref;
    for (pp = pbase, i = 0; i < nproc; pp++, i++)
    {
	/*
	 *  Place pointers to each valid proc structure in pref[].
	 *  Process slots that are actually in use have a non-zero
	 *  status field.  Processes with SSYS set are system
	 *  processes---these get ignored unless show_sysprocs is set.
	 */
	if (pp->p_stat != 0 &&
	    (show_system || ((pp->p_flag & SSYS) == 0)))
	{
	    total_procs++;
	    process_states[pp->p_stat]++;
	    if ((pp->p_stat != SZOMB) &&
		(show_idle || (pp->p_pctcpu != 0) || (pp->p_stat == SRUN)) &&
		(!show_uid || pp->p_uid == (uid_t)sel->uid))
	    {
		*prefp++ = pp;
		active_procs++;

		if (getu(pp, &u) == -1)
		  PROCTIME(pp) = 0;
		else
		  PROCTIME(pp) = u.u_ru.ru_utime.tv_sec + u.u_ru.ru_stime.tv_sec;
	    }
	}
    }

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