m_sco5.c

unix系统下top命令的源代码

/*
 * top - a top users display for Unix
 *
 * SYNOPSIS:  SCO UNIX OpenServer5
 *
 * DESCRIPTION:
 * This is the machine-dependent module for SCO OpenServer5.
 * Originally written for BSD4.3 system by Christos Zoulas.
 * Modified to m_sco.c (3.2v4.2)  by Gregory Shilin <[e-mail]>
 * Modified to m_sco5.c (3.2v5.*) by Mike Hopkirk <[e-mail]>
 * Works for:
 * SCO UNIX 3.2v5.*
 *
 * CFLAGS: -DHAVE_GETOPT -DORDER
 *
 * AUTHOR: Mike Hopkirk ([e-mail])
 * hops 10-Jul-98 - added sort fields
 *      17-Jul-98 - add philiph's chopped cmd string support
 *                    (define NO_COMMAND_ARGS to enable )
 *      09-Dec-98 - provide RSS calculation
 *      15-Mar-2000 - Fix broken lines and cleanup sysinfo access w macros
 */

#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 <string.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"

#define SI_ACTIVE(p)   p->p_active
#define SI_TOTAL(p)    p->p_total

/* 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

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 */
   { 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;

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

/* 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;
   statics->order_names = ordernames ;  /* hops */

   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);
}


/* philiph - get run ave fm /dev/table info */
static int
tab_avenrun(double runave[])
{
   FILE *fp = fopen("/dev/table/avenrun", "r");
   int i;

   for (i=0; i<3; i++)
      runave[i] = -1.0;

   if (fp==NULL)
      return -1;
   else
   {
      short rawave[3];

	if (fread(rawave, sizeof(short), 3, fp) !=3 )
	{
	    fclose(fp);
	    return -1;
	}
	else
	{
	    int i;

	    for (i=0; i<3; i++)
		runave[i] = (double) (rawave[i] / 256.0);

	    fclose(fp);
	    return 0;
	}
    }
}

struct pregion *
get_pregion(void *ptr)
{
    static struct pregion preg;
    long addr = (long)ptr;

   (void) getkval(addr , (struct pregion *)(&preg),
		    sizeof(struct pregion), "pregion" );
    return &preg;
}

struct region *
get_region(void *ptr)
{
    static struct region reg;
    long addr = (long)ptr;

   (void) getkval( addr , (struct region *)(&reg),
		    sizeof(struct region), "region" );
    return &reg;
}

static unsigned char shareable[RT_VM86 + 1];     /* 1 if shareable */

/*
 * sum private referenced pages,
 * treat shared pages depending on value of TREAT_SHARABLE_PAGES macro
 *      undefined : ignore (don't account for - default)
 *      1:  divide among # of references
 *      2:  accumulate as if private
 */
/* #define TREAT_SHAREABLE_PAGES 1 */
static long
proc_residentsize(struct proc *pp)
{
    struct pregion *prp;
    struct region *rp;
    long rtot = 0;
    long stot = 0;
    long s1tot = 0;

    /* init shareable region array */
    if (shareable[RT_STEXT] == 0 )
	shareable[RT_STEXT] = shareable[RT_SHMEM] = shareable[RT_MAPFILE] = 1
	;

    prp = pp->p_region;

    if ( prp == 0)
	return 0;

    for( ; prp && (prp = get_pregion((void *)(prp))) &&
	   prp->p_reg && (rp = get_region((void*)(prp->p_reg)));
	   prp = prp->p_next)
    {
	if (shareable[rp->r_type] )     /* account for shared pgs separately
	*/
	{
	    stot  += (rp->r_nvalid / rp->r_refcnt);
	    s1tot += rp->r_nvalid;
	}
	else
	    rtot += rp->r_nvalid;

    }
#if defined(TREAT_SHAREABLE_PAGES) && TREAT_SHAREABLE_PAGES == 1
	rtot += stot;           /* accumulate and spread over users */
#endif

#if defined(TREAT_SHAREABLE_PAGES) && TREAT_SHAREABLE_PAGES == 1
	rtot += s1tot;          /* accumulate as if private */
#endif

    return rtot * NBPP/1024; ;
}


get_system_info(si)
struct system_info *si;
{
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);

   /* convert cp_time counts to persentages */
   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;

   tab_avenrun(si->load_avg);   /* philiph */
}

static struct handle handle;

caddr_t get_process_info(si, sel, compare)
	struct system_info *si;
	struct process_select *sel;
	int (*compare)();
{