m_sco.c

unix系统下top命令的源代码

/*
 * top - a top users display for Unix
 *
 * SYNOPSIS:  SCO UNIX
 *
 * DESCRIPTION:
 * This is the machine-dependent module for SCO UNIX.
 * Originally written for BSD4.3 system by Christos Zoulas.
 * Works for:
 * SCO UNIX 3.2v4.2
 *
 * CFLAGS: -iBCS2
 *
 * You HAVE to use compiler option: -iBCS2
 *       (Enforces strict Intel Binary Compatibility Standard 2 conformance.)
 *
 * AUTHOR:  Gregory Shilin <[e-mail]>
 *          Georgi Kuzmanov <[e-mail]>
 */

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

#include <stdio.h>
#include <unistd.h>
#include <fcntl.h>
#include <nlist.h>
#include <math.h>
#include <signal.h>

#include <sys/dir.h>
#include <sys/immu.h>
#include <sys/region.h>
#include <sys/proc.h>
#include <sys/user.h>
#include <sys/sysinfo.h>
#include <sys/systm.h>
#include <sys/sysmacros.h>
#include <sys/var.h>
#include <sys/sysi86.h>

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

typedef unsigned long  ulong;
typedef unsigned int   uint;
typedef unsigned short ushort;
typedef unsigned char  uchar;

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

/* 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 */
};

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

#define bytetok(bytes) ((bytes) >> 10)

/* what we consider to be process size: */
#define PROCSIZE(up) bytetok(ctob((up)->u_tsize + (up)->u_dsize +(up)->u_ssize))

/* definitions for indices in the nlist array */
#define X_V		0  /* System configuration information */
#define X_PROC		1  /* process tables */
#define X_FREEMEM	2  /* current free memory */
#define X_AVAILRMEM	3  /* available resident (not swappable) mem in pages */
#define X_AVAILSMEM	4  /* available swappable memory in pages */
#define X_MAXMEM	5  /* maximum available free memory in clicks */
#define X_PHYSMEM	6  /* physical memory in clicks */
#define X_NSWAP		7  /* size of swap space in blocks */
#define X_HZ		8  /* ticks/second of the clock */
#define X_MPID		9  /* last process id */
#define X_SYSINFO	10 /* system information (cpu states) */
#define X_CUR_CPU	11
#define X_AVENRUN       12 /* load averages */


static struct nlist nlst[] = {
   { "v" },		/* 0 */
   { "proc" },		/* 1 */
   { "freemem" },	/* 2 */
   { "availrmem" },	/* 3 */
   { "availsmem" },	/* 4 */
   { "maxmem" },	/* 5 */
   { "physmem" },	/* 6 */
   { "nswap" },		/* 7 */
   { "Hz" },		/* 8 */
   { "mpid" },		/* 9 */
   { "sysinfo" },	/* 10 */
   { "cur_cpu" },	/* 11 */
   { "avenrun" },	/* 12 */
   { NULL }
};

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

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

#define Proc_format \
	"%5d %-8.8s %3d %4d  %5s %5dK %-5s %6s  %.28s"

static int kmem, mem;

static double logcpu;

/* these are retrieved from the kernel in _init */
static int   Hz;
static struct var   v;
static ulong proca;
static load_avg  cur_cpu;
static unsigned short int anr[NUM_AVERAGES];


/* these are for detailing the process states */
int process_states[8];
char *procstatenames[] = {
    "", " sleeping, ", " running, ", " zombie, ", " stopped, ",
    " created, ", " onproc, ", " xswapped, ",
    NULL
};

/* process state names for the "STATE" column of the display */
char *state_abbrev[] = {
   "", "sleep", "run", "zomb", "stop", "create", "onpr", "swap"
};

/* these are for calculating cpu state percentages */
#define CPUSTATES	5    /* definition from struct sysinfo */
static time_t cp_time[CPUSTATES];
static time_t cp_old[CPUSTATES];
static time_t cp_diff[CPUSTATES];

/* these are for detailing the cpu states */
int cpu_states[CPUSTATES];
char *cpustatenames[] = {
    "idle", "user", "system", "wait", "sxbrk",
    NULL
};

/* these are for detailing the memory statistics */
int memory_stats[6];
char *memorynames[] = {
    "K phys, ", "K max, ", "K free, ", "K locked, ", "K unlocked, ", "K swap, ", 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;

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

long time();
long percentages();

machine_init(statics)
struct statics *statics;
{
ulong ptr;

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

   /* get the list of symbols we want to access in the kernel */
   if (nlist(VMUNIX, nlst) == -1) {
      fprintf(stderr, "top: nlist failed\n");
      return -1;
   }
   /* make sure they were all found */
   /*ZZ
   if (check_nlist(nlst) > 0)
      return -1;
   */

   proca = nlst[X_PROC].n_value;

   /* get the symbol values out of kmem */
   (void) getkval(nlst[X_CUR_CPU].n_value, (int *)(&cur_cpu), sizeof(cur_cpu),
                  nlst[X_CUR_CPU].n_name);
   (void) getkval(nlst[X_HZ].n_value,      (int *)(&Hz),      sizeof(Hz),
                  nlst[X_HZ].n_name);
   (void) getkval(nlst[X_V].n_value,       (int *)(&v),       sizeof(v),
                  nlst[X_V].n_name);

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

   /* allocate space for proc structure array and array of pointers */
   bytes = v.v_proc * sizeof(struct proc);
   pbase = (struct proc *)malloc(bytes);
   pref  = (struct proc **)malloc(v.v_proc * sizeof(struct proc *));
   if (pbase == (struct proc *)NULL || pref == (struct proc **)NULL) {
      fprintf(stderr, "top: cannot allocate sufficient memory\n");
      return -1;
   }

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

   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;
{
int i;
long total;

   /* get process id of the last process */
   (void) getkval(nlst[X_MPID].n_value,  &(si->last_pid),  sizeof(si->last_pid),
                  nlst[X_MPID].n_name);
   /* get the cp_time array */
   (void) getkval(nlst[X_SYSINFO].n_value, (int *)cp_time, sizeof(cp_time),
                  nlst[X_SYSINFO].n_name);

   /* get the load averages and convert them... */
   (void) getkval(nlst[X_AVENRUN].n_value, (int *)(&anr[0]), sizeof(anr),
                  nlst[X_AVENRUN].n_name);

   for (i = 0; i < NUM_AVERAGES; i++)
       si->load_avg[i] = (double)anr[i]/256.0;


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

   /* sum memory statistics */
   (void) getkval(nlst[X_PHYSMEM].n_value, &memory_stats[0],
                  sizeof(memory_stats[0]), nlst[X_PHYSMEM].n_name);
   (void) getkval(nlst[X_MAXMEM].n_value, &memory_stats[1],
                  sizeof(memory_stats[1]), nlst[X_MAXMEM].n_name);
   (void) getkval(nlst[X_FREEMEM].n_value, &memory_stats[2],
                  sizeof(memory_stats[2]), nlst[X_FREEMEM].n_name);
   (void) getkval(nlst[X_AVAILRMEM].n_value, &memory_stats[3],
                  sizeof(memory_stats[3]), nlst[X_AVAILRMEM].n_name);
   (void) getkval(nlst[X_AVAILSMEM].n_value, &memory_stats[4],
                  sizeof(memory_stats[4]), nlst[X_AVAILSMEM].n_name);
   (void) getkval(nlst[X_NSWAP].n_value, &memory_stats[5],
                  sizeof(memory_stats[5]), nlst[X_NSWAP].n_name);
   memory_stats[0] = bytetok(ctob(memory_stats[0]));    /* clicks -> bytes    */
   memory_stats[1] = bytetok(ctob(memory_stats[1]));    /* clicks -> bytes    */
   memory_stats[2] = bytetok(ctob(memory_stats[2]));    /* clicks -> bytes    */
   memory_stats[3] = bytetok(memory_stats[3] * NBPP);   /* # bytes per page   */
   memory_stats[4] = bytetok(memory_stats[4] * NBPP);   /* # bytes per page   */
   memory_stats[5] = bytetok(memory_stats[5] * NBPSCTR);/* # bytes per sector */

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

static struct handle handle;

caddr_t get_process_info(si, sel, compare)