update from Steve McCanne for Sun compatible kvm

[unix-history] / usr / src / usr.bin / w / w.c

/*-
* Copyright (c) 1980, 1991 The Regents of the University of California.
* All rights reserved.
*
* %sccs.include.redist.c%
*/

#ifndef lint
char copyright[] =
"@(#) Copyright (c) 1980, 1991 The Regents of the University of California.\n\
All rights reserved.\n";
#endif /* not lint */

#ifndef lint
static char sccsid[] = "@(#)w.c 5.32 (Berkeley) %G%";
#endif /* not lint */

#define ADDRHACK

/*
* w - print system status (who and what)
*
* This program is similar to the systat command on Tenex/Tops 10/20
*
*/
#include <sys/param.h>
#include <sys/file.h>
#include <sys/time.h>
#include <sys/stat.h>
#include <sys/kinfo.h>
#include <sys/proc.h>
#include <sys/user.h>
#include <sys/ioctl.h>
#include <sys/tty.h>
#include <ctype.h>
#include <kvm.h>
#include <nlist.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <utmp.h>
#include <paths.h>

#ifdef ADDRHACK
#include <sys/socket.h>
#include <netdb.h>
#endif

char    *program;
int     ttywidth;               /* width of tty */
int     argwidth;               /* width of tty */
int     header = 1;             /* true if -h flag: don't print heading */
int     wcmd = 1;               /* true if this is w(1), and not uptime(1) */
#ifdef ADDRHACK
int     nflag = 0;              /* true if -n flag: don't convert addrs */
#endif
int     nusers;                 /* number of users logged in now */
char *  sel_user;               /* login of particular user selected */
time_t  now;                    /* the current time of day */
struct  timeval boottime;
time_t  uptime;                 /* time of last reboot & elapsed time since */
struct  utmp utmp;
struct  winsize ws;
int     sortidle;               /* sort bu idle time */
#ifdef ADDRHACK
char    domain[64];
#endif
kvm_t *kd;

#if __STDC__
void error(const char *fmt, ...);
#else
void error();
#endif

void prttime();

/*
* One of these per active utmp entry.
*/
struct  entry {
       struct  entry *next;
       struct  utmp utmp;
       dev_t   tdev;           /* dev_t of terminal */
       int     idle;           /* idle time of terminal in minutes */
       struct  kinfo_proc *kp; /* `most interesting' proc */
       char    *args;          /* arg list of interesting process */
} *ep, *ehead = NULL, **nextp = &ehead;

struct nlist nl[] = {
       { "_boottime" },
#define X_BOOTTIME      0
#if defined(hp300) || defined(i386)
       { "_cn_tty" },
#define X_CNTTY         1
#endif
       { "" },
};

#define USAGE "[ -hi ] [ user ]"
#define usage() fprintf(stderr, "usage: %s: %s\n", program, USAGE)

main(argc, argv)
       int argc;
       char **argv;
{
       register int i;
       register struct kinfo_proc *kp;
       struct stat *stp, *ttystat();
       FILE *ut;
       char *cp;
       int nentries;
       int ch;
       extern char *optarg;
       extern int optind;
       char *attime();
       char errbuf[80];

       program = argv[0];
       /*
        * are we w(1) or uptime(1)
        */
       if ((cp = rindex(program, '/')) || *(cp = program) == '-')
               cp++;
       if (*cp == 'u')
               wcmd = 0;

       while ((ch = getopt(argc, argv, "hiflnsuw")) != EOF)
               switch((char)ch) {
               case 'h':
                       header = 0;
                       break;
               case 'i':
                       sortidle++;
                       break;
               case 'n':
#ifdef ADDRHACK
                       ++nflag;
#endif
                       break;
               case 'f': case 'l': case 's': case 'u': case 'w':
                       error("[-flsuw] no longer supported");
                       usage();
                       exit(1);
               case '?':
               default:
                       usage();
                       exit(1);
               }
       argc -= optind;
       argv += optind;

       if (*argv)
               sel_user = *argv;

       kd = kvm_openfiles((char *)0, (char *)0, (char *)0, O_RDONLY, errbuf);
       if (kd == NULL) {
               error("%s", errbuf);
               exit(1);
       }
       if (header && kvm_nlist(kd, nl) != 0) {
               error("can't get namelist");
               exit(1);
       }
#ifdef ADDRHACK
       if (!nflag) {
               if (gethostname(domain, sizeof(domain) - 1) < 0 ||
                   (cp = index(domain, '.')) == 0)
                       domain[0] = '\0';
               else {
                       domain[sizeof(domain) - 1] = '\0';
                       bcopy(cp, domain, strlen(cp) + 1);
               }
       }
#endif
       time(&now);
       ut = fopen(_PATH_UTMP, "r");
       while (fread(&utmp, sizeof(utmp), 1, ut)) {
               if (utmp.ut_name[0] == '\0')
                       continue;
               nusers++;
               if (wcmd == 0 || (sel_user &&
                   strncmp(utmp.ut_name, sel_user, UT_NAMESIZE) != 0))
                       continue;
               if ((ep = (struct entry *)
                    calloc(1, sizeof (struct entry))) == NULL) {
                       error("out of memory");
                       exit(1);
               }
               *nextp = ep;
               nextp = &(ep->next);
               bcopy(&utmp, &(ep->utmp), sizeof (struct utmp));
               stp = ttystat(ep->utmp.ut_line);
               ep->tdev = stp->st_rdev;
#if defined(hp300) || defined(i386)
               /*
                * XXX  If this is the console device, attempt to ascertain
                * the true console device dev_t.
                */
               if (ep->tdev == 0) {
                       static dev_t cn_dev;

                       if (nl[X_CNTTY].n_value) {
                               struct tty cn_tty, *cn_ttyp;
                               
                               if (kvm_read(kd, (u_long)nl[X_CNTTY].n_value,
                                   (char *)&cn_ttyp, sizeof(cn_ttyp)) > 0) {
                                       (void)kvm_read(kd, (u_long)cn_ttyp,
                                           (char *)&cn_tty, sizeof (cn_tty));
                                       cn_dev = cn_tty.t_dev;
                               }
                               nl[X_CNTTY].n_value = 0;
                       }
                       ep->tdev = cn_dev;
               }
#endif
               ep->idle = ((now - stp->st_atime) + 30) / 60; /* secs->mins */
               if (ep->idle < 0)
                       ep->idle = 0;
       }
       fclose(ut);

       if (header || wcmd == 0) {
               double  avenrun[3];
               int days, hrs, mins;

               /*
                * Print time of day
                */
               fputs(attime(&now), stdout);
               /*
                * Print how long system has been up.
                * (Found by looking for "boottime" in kernel)
                */
               (void)kvm_read(kd, (u_long)nl[X_BOOTTIME].n_value,
                   (char *)&boottime, sizeof (boottime));
               uptime = now - boottime.tv_sec;
               uptime += 30;
               days = uptime / (60*60*24);
               uptime %= (60*60*24);
               hrs = uptime / (60*60);
               uptime %= (60*60);
               mins = uptime / 60;

               printf("  up");
               if (days > 0)
                       printf(" %d day%s,", days, days>1?"s":"");
               if (hrs > 0 && mins > 0) {
                       printf(" %2d:%02d,", hrs, mins);
               } else {
                       if (hrs > 0)
                               printf(" %d hr%s,", hrs, hrs>1?"s":"");
                       if (mins > 0)
                               printf(" %d min%s,", mins, mins>1?"s":"");
               }

               /* Print number of users logged in to system */
               printf("  %d user%s", nusers, nusers>1?"s":"");

               /*
                * Print 1, 5, and 15 minute load averages.
                */
               printf(",  load average:");
               (void)getloadavg(avenrun, sizeof(avenrun) / sizeof(avenrun[0]));
               for (i = 0; i < (sizeof(avenrun)/sizeof(avenrun[0])); i++) {
                       if (i > 0)
                               printf(",");
                       printf(" %.2f", avenrun[i]);
               }
               printf("\n");
               if (wcmd == 0)          /* if uptime(1) then done */
                       exit(0);
#define HEADER  "USER    TTY FROM              LOGIN@  IDLE WHAT\n"
#define WUSED   (sizeof (HEADER) - sizeof ("WHAT\n"))
               printf(HEADER);
       }

       if ((kp = kvm_getprocs(kd, KINFO_PROC_ALL, 0, &nentries)) == NULL)
               error("%s", kvm_geterr(kd));
       for (i = 0; i < nentries; i++, kp++) {
               register struct proc *p = &kp->kp_proc;
               register struct eproc *e;

               if (p->p_stat == SIDL || p->p_stat == SZOMB)
                       continue;
               e = &kp->kp_eproc;
               for (ep = ehead; ep != NULL; ep = ep->next) {
                       if (ep->tdev == e->e_tdev && e->e_pgid == e->e_tpgid) {
                               /*
                                * Proc is in foreground of this terminal
                                */
                               if (proc_compare(&ep->kp->kp_proc, p))
                                       ep->kp = kp;
                               break;
                       }
               }
       }
       if ((ioctl(1, TIOCGWINSZ, &ws) == -1 &&
            ioctl(2, TIOCGWINSZ, &ws) == -1 &&
            ioctl(0, TIOCGWINSZ, &ws) == -1) || ws.ws_col == 0)
              ttywidth = 79;
       else
              ttywidth = ws.ws_col - 1;
       argwidth = ttywidth - WUSED;
       if (argwidth < 4)
               argwidth = 8;
       for (ep = ehead; ep != NULL; ep = ep->next) {
               char *fmt_argv();

               if (ep->kp == NULL) {
                       ep->args = "-";
                       continue;
               }
               ep->args = fmt_argv(kvm_getargv(kd, ep->kp, argwidth),
                   ep->kp->kp_proc.p_comm, MAXCOMLEN);
               if (ep->args == NULL) {
                       error("out of memory");
                       exit(1);
               }
       }
       /* sort by idle time */
       if (sortidle && ehead != NULL) {
               struct entry *from = ehead, *save;
               
               ehead = NULL;
               while (from != NULL) {
                       for (nextp = &ehead;
                           (*nextp) && from->idle >= (*nextp)->idle;
                           nextp = &(*nextp)->next)
                               continue;
                       save = from;
                       from = from->next;
                       save->next = *nextp;
                       *nextp = save;
               }
       }
                       
       for (ep = ehead; ep != NULL; ep = ep->next) {
#ifdef ADDRHACK
               register char *x;
               register struct hostent *hp;
               unsigned long l;
               char buf[64];
#endif

               cp = *ep->utmp.ut_host ? ep->utmp.ut_host : "-";
#ifdef ADDRHACK
               if (x = index(cp, ':'))
                       *x++ = '\0';
               if (!nflag && isdigit(*cp) &&
                   (long)(l = inet_addr(cp)) != -1 &&
                   (hp = gethostbyaddr((char *)&l, sizeof(l),
                   AF_INET))) {
                           if (domain[0] != '\0') {
                                   cp = hp->h_name;
                                   cp += strlen(hp->h_name);
                                   cp -= strlen(domain);
                                   if (cp > hp->h_name &&
                                       strcmp(cp, domain) == 0)
                                       *cp = '\0';
                           }
                           cp = hp->h_name;
               }
               if (x) {
                       sprintf(buf, "%s:%s", cp, x);
                       cp = buf;
               }
#endif
               printf("%-*.*s %-2.2s %-*.*s %s",
                       UT_NAMESIZE, UT_NAMESIZE, ep->utmp.ut_name,
                       strncmp(ep->utmp.ut_line, "tty", 3) == 0 ?
                               ep->utmp.ut_line+3 : ep->utmp.ut_line,
                       UT_HOSTSIZE, UT_HOSTSIZE, *cp ? cp : "-",
                       attime(&ep->utmp.ut_time));
               if (ep->idle >= 36 * 60)
                       printf(" %ddays ", (ep->idle + 12 * 60) / (24 * 60));
               else
                       prttime(ep->idle, " ");
               printf("%.*s\n", argwidth, ep->args);
       }
       exit(0);
}

struct stat *
ttystat(line)
       char *line;
{
       static struct stat statbuf;
       char ttybuf[sizeof (_PATH_DEV) + UT_LINESIZE + 1];

       sprintf(ttybuf, "%s/%.*s", _PATH_DEV, UT_LINESIZE, line);
       (void) stat(ttybuf, &statbuf);

       return (&statbuf);
}

/*
* prttime prints a time in hours and minutes or minutes and seconds.
* The character string tail is printed at the end, obvious
* strings to pass are "", " ", or "am".
*/
void
prttime(tim, tail)
       time_t tim;
       char *tail;
{

       if (tim >= 60) {
               printf(" %2d:", tim/60);
               tim %= 60;
               printf("%02d", tim);
       } else if (tim >= 0)
               printf("    %2d", tim);
       printf("%s", tail);
}

#if __STDC__
#include <stdarg.h>
#else
#include <varargs.h>
#endif

void
#if __STDC__
error(const char *fmt, ...)
#else
error(va_alist)
       va_dcl
#endif
{
#if !__STDC__
       char *fmt;
#endif
       va_list ap;

       fprintf(stderr, "%s: ", program);
#if __STDC__
       va_start(ap, fmt);
#else
       va_start(ap);
       fmt = va_arg(ap, char *);
#endif
       (void) vfprintf(stderr, fmt, ap);
       va_end(ap);
       fprintf(stderr, "\n");
}