m_hpux10.c

unix系统下top命令的源代码

/*
 * top - a top users display for Unix
 *
 * SYNOPSIS:  any hp9000 running hpux version 10.x
 *
 * DESCRIPTION:
 * This is the machine-dependent module for HPUX 10/11 that uses pstat.
 * It has been tested on HP/UX 10.01, 10.20, and 11.00.  It is presumed
 * to work also on 10.10.
 * Idle processes are marked by being either runnable or having a %CPU
 * of at least 0.1%.  This fraction is defined by CPU_IDLE_THRESH and
 * can be adjusted at compile time.
 *
 * CFLAGS: -DHAVE_GETOPT
 *
 * LIBS: 
 *
 * AUTHOR: John Haxby <[e-mail]>
 * AUTHOR: adapted from Rich Holland <[e-mail]>
 * AUTHOR: adapted from Kevin Schmidt <[e-mail]> 
 */

#include <stdio.h>
#include <errno.h>
#include <unistd.h>
#include <ctype.h>
#include <signal.h>
#include <nlist.h>
#include <fcntl.h>
#include <stdlib.h>

#include <sys/types.h>
#include <sys/param.h>
#include <sys/pstat.h>
#include <sys/dk.h>
#include <sys/stat.h>
#include <sys/dirent.h>

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

/*
 * The idle threshold (CPU_IDLE_THRESH) is an extension to the normal
 * idle process check.  Basically, we regard a process as idle if it is
 * both asleep and using less that CPU_IDLE_THRESH percent cpu time.  I
 * believe this makes the "i" option more useful, but if you don't, add
 * "-DCPU_IDLE_THRESH=0.0" to the CFLAGS.
 */
#ifndef CPU_IDLE_THRESH
#define CPU_IDLE_THRESH 0.1
#endif

# define P_RSSIZE(p) (p)->pst_rssize
# define P_TSIZE(p) (p)->pst_tsize
# define P_DSIZE(p) (p)->pst_dsize
# define P_SSIZE(p) (p)->pst_ssize

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

/* what we consider to be process size: */
#define PROCSIZE(pp) (P_TSIZE(pp) + P_DSIZE(pp) + P_SSIZE(pp))

/* definitions for indices in the nlist array */
#define X_MPID		0

static struct nlist nlst[] = {
    { "mpid" },
    { 0 }
};

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

static char header[] =
  "     TTY   PID X         PRI NICE  SIZE   RES STATE   TIME    CPU COMMAND";
/* 0123456789.12345 -- field to fill in starts at header+6 */
#define UNAME_START 15

#define Proc_format \
	"%8.8s %5d %-8.8s %4d %4d %5s %5s %-5s %6s %5.2f%% %s"

/* process state names for the "STATE" column of the display */

char *state_abbrev[] =
{
    "", "sleep", "run", "stop", "zomb", "trans", "start"
};


/* values that we stash away in _init and use in later routines */
static int kmem;
static struct pst_status *pst;

/* these are retrieved from the OS in _init */
static int nproc;
static int ncpu = 0;

/* these are offsets obtained via nlist and used in the get_ functions */
static unsigned long mpid_offset;

/* these are for calculating cpu state percentages */
static long cp_time[PST_MAX_CPUSTATES];
static long cp_old[PST_MAX_CPUSTATES];
static long cp_diff[PST_MAX_CPUSTATES];

/* these are for detailing the process states */
int process_states[7];
char *procstatenames[] = {
    "", " sleeping, ", " running, ", " stopped, ", " zombie, ",
    " trans, ", " starting, ",
    NULL
};

/* these are for detailing the cpu states */
int cpu_states[PST_MAX_CPUSTATES];
char *cpustatenames[] = {
    /* roll "swait" into "block" and "ssys" into "sys" */
    "usr", "nice", "sys", "idle", "", "block", "\0swait", "intr", "\0ssys",
    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 getting the memory statistics */
static int pageshift;		/* log base 2 of the pagesize */

/* define pagetok in terms of pageshift */
#define pagetok(size) ((size) << pageshift)

/* Mapping TTY major/minor numbers is done through this structure */
struct ttymap {
    dev_t dev;
    char name [9];
};
static struct ttymap *ttynames = NULL;
static int nttys = 0;
static get_tty_names ();


machine_init(statics)

struct statics *statics;

{
    struct pst_static info;
    int i = 0;
    int pagesize;

    /* If we can get mpid from the kernel, we'll use it, otherwise    */
    /* we'll guess from the most recently started proces              */
    if ((kmem = open (KMEM, O_RDONLY)) < 0 ||
	(nlist (VMUNIX, nlst)) < 0 ||
	(nlst[X_MPID].n_type) == 0)
	mpid_offset = 0;
    else
	mpid_offset = nlst[X_MPID].n_value;

    if (pstat_getstatic (&info, sizeof (info), 1, 0) < 0)
    {
	perror ("pstat_getstatic");
	return -1;
    }

    /*
     * Allocate space for the per-process structures (pst_status).  To
     * make life easier, simply allocate enough storage to hold all the
     * process information at once.  This won't normally be a problem
     * since machines with lots of processes configured will also have
     * lots of memory.
     */
    nproc = info.max_proc;
    pst = (struct pst_status *) malloc (nproc * sizeof (struct pst_status));
    if (pst == NULL)
    {
	fprintf (stderr, "out of memory\n");
	return -1;
    }

    /*
     * Calculate pageshift -- the value needed to convert pages to Kbytes.
     * This will usually be 2.
     */
    pageshift = 0;
    for (pagesize = info.page_size; pagesize > 1; pagesize >>= 1)
	pageshift += 1;
    pageshift -= LOG1024;

    /* get tty name information */
    i = 0;
    get_tty_names ("/dev", &i);

    /* 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)
char *uname_field;
{
    char *ptr = header + UNAME_START;
    while (*uname_field != '\0')
	*ptr++ = *uname_field++;

    return header;
}

get_system_info(si)

struct system_info *si;

{
    static struct pst_dynamic dynamic;
    int i, n;
    long total;

    pstat_getdynamic (&dynamic, sizeof (dynamic), 1, 0);
    ncpu = dynamic.psd_proc_cnt;  /* need this later */

    /* Load average */
    si->load_avg[0] = dynamic.psd_avg_1_min;
    si->load_avg[1] = dynamic.psd_avg_5_min;
    si->load_avg[2] = dynamic.psd_avg_15_min;

    /*
     * CPU times
     * to avoid space problems, we roll SWAIT (kernel semaphore block)
     * into BLOCK (spin lock block) and SSYS (kernel process) into SYS
     * (system time) Ideally, all screens would be wider :-)
     */
    dynamic.psd_cpu_time [CP_BLOCK] += dynamic.psd_cpu_time [CP_SWAIT];
    dynamic.psd_cpu_time [CP_SWAIT] = 0;
    dynamic.psd_cpu_time [CP_SYS] += dynamic.psd_cpu_time [CP_SSYS];
    dynamic.psd_cpu_time [CP_SSYS] = 0;
    for (i = 0; i < PST_MAX_CPUSTATES; i++)
	cp_time [i] = dynamic.psd_cpu_time [i];
    percentages(PST_MAX_CPUSTATES, cpu_states, cp_time, cp_old, cp_diff);
    si->cpustates = cpu_states;

    /*
     * VM statistics
     */	
    memory_stats[0] = -1;
    memory_stats[1] = pagetok (dynamic.psd_arm);
    memory_stats[2] = pagetok (dynamic.psd_rm);
    memory_stats[3] = -1;
    memory_stats[4] = pagetok (dynamic.psd_avm);
    memory_stats[5] = pagetok (dynamic.psd_vm);
    memory_stats[6] = -1;
    memory_stats[7] = pagetok (dynamic.psd_free);
    si->memory = memory_stats;

    /*
     * If we can get mpid from the kernel, then we will do so now. 
     * Otherwise we'll guess at mpid from the most recently started
     * process time.  Note that this requires us to get the pst array
     * now rather than in get_process_info().  We rely on
     * get_system_info() being called before get_system_info() for this
     * to work reliably.
     */
    for (i = 0; i < nproc; i++)
	pst[i].pst_pid = -1;
    n = pstat_getproc (pst, sizeof (*pst), nproc, 0);

    if (kmem >= 0 && mpid_offset > 0)
	(void) getkval(mpid_offset, &(si->last_pid), sizeof(si->last_pid), "mpid");
    else
    {
	static int last_start_time = 0;
	int pid = 0;

	for (i = 0; i < n; i++)
	{
	    if (last_start_time <= pst[i].pst_start) 
	    {
	    	last_start_time = pst[i].pst_start;
		if (pid <= pst[i].pst_pid)
		    pid = pst[i].pst_pid;
	    }
	}
	if (pid != 0)
	    si->last_pid = pid;
    }
}

caddr_t get_process_info(si, sel, compare)

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

{
    static int handle;
    int i, active, total;

    /*
     * Eliminate unwanted processes
     * and tot up all the wanted processes by state
     */
    for (i = 0; i < sizeof (process_states)/sizeof (process_states[0]); i++)
	process_states [i] = 0;

    for (total = 0, active = 0, i = 0; pst[i].pst_pid >= 0; i++)
    {
	int state = pst[i].pst_stat;

	process_states [state] += 1;
	total += 1;

	if (!sel->system && (pst[i].pst_flag & PS_SYS))
	{
	    pst[i].pst_stat = -1;
	    continue;
	}

	/*
	 * If we are eliminating idle processes, then a process is regarded
	 * as idle if it is in a short term sleep and not using much
	 * CPU, or stopped, or simple dead.
	 */
	if (!sel->idle