2.9BSD/usr/src/ucb/w.c
/*
* w - print system status (who and what)
*
* This program is similar to the systat command on Tenex/Tops 10/20
* It needs read permission on /dev/mem and /dev/swap.
*
* PDP-11 V7 version that does not run off ps -r.
*/
#include <whoami.h>
#include <a.out.h>
#include <core.h>
#include <stdio.h>
#include <ctype.h>
#include <utmp.h>
#include <time.h>
#include <sys/param.h>
#include <sys/stat.h>
#include <sys/proc.h>
#include <sys/dir.h>
#include <sys/user.h>
#include <sys/tty.h>
#define ARGWIDTH 33 /* # chars left on 80 col crt for args */
#define ARGLIST 1024 /* amount of stack to examine for argument list */
struct smproc {
long w_addr; /* address in file for args */
short w_pid; /* proc.p_pid */
int w_igintr; /* INTR+3*QUIT, 0=die, 1=ign, 2=catch */
time_t w_time; /* CPU time used by this process */
time_t w_ctime; /* CPU time used by children */
dev_t w_tty; /* tty device of process */
char w_comm[15]; /* user.u_comm, null terminated */
char w_args[ARGWIDTH+1]; /* args if interesting process */
} *pr;
struct nlist nl[] = {
{ "_proc" },
#define X_PROC 0
{ "_swapdev" },
#define X_SWAPDEV 1
{ "_swplo" },
#define X_SWPLO 2
{ "_avenrun" },
#define X_AVENRUN 3
{ "_bootime" },
#define X_BOOTIME 4
{ "_nproc" },
#define X_NPROC 5
{ 0 },
};
FILE *ps;
FILE *ut;
FILE *bootfd;
int swmem;
int mem;
int swap; /* /dev/mem, mem, and swap */
int nswap;
int file;
dev_t tty;
char doing[520]; /* process attached to terminal */
time_t proctime; /* cpu time of process in doing */
short avenrun[3];
double load[3];
#define DIV60(t) ((t+30)/60) /* x/60 rounded */
#define TTYEQ (tty == pr[i].w_tty)
#define IGINT (1+3*1) /* ignoring both SIGINT & SIGQUIT */
long round();
char *getargs();
char *fread();
char *ctime();
char *rindex();
char *getptr();
FILE *popen();
struct tm *localtime();
int debug; /* true if -d flag: debugging output */
int header = 1; /* true if -h flag: don't print heading */
int lflag = 1; /* true if -l flag: long style output */
int login; /* true if invoked as login shell */
time_t idle; /* number of minutes user is idle */
int nusers; /* number of users logged in now */
char * sel_user; /* login of particular user selected */
char firstchar; /* first char of name of prog invoked as */
time_t jobtime; /* total cpu time visible */
time_t now; /* the current time of day */
struct tm *nowt; /* current time as time struct */
time_t bootime, uptime; /* time of last reboot & elapsed time since */
int np; /* number of processes currently active */
struct utmp utmp;
struct proc mproc;
struct user up;
char fill[512];
struct map {
long b1, e1; long f1;
long b2, e2; long f2;
};
struct map datmap;
main(argc, argv)
char **argv;
{
int days, hrs, mins;
register int i, j;
char *cp;
register int curpid, empty;
extern char _sobuf[];
setbuf(stdout, _sobuf);
login = (argv[0][0] == '-');
cp = rindex(argv[0], '/');
firstchar = login ? argv[0][1] : (cp==0) ? argv[0][0] : cp[1];
cp = argv[0]; /* for Usage */
while (argc > 1) {
if (argv[1][0] == '-') {
for (i=1; argv[1][i]; i++) {
switch(argv[1][i]) {
case 'd':
debug++;
break;
case 'h':
header = 0;
break;
case 'l':
lflag++;
break;
case 's':
lflag = 0;
break;
case 'u':
case 'w':
firstchar = argv[1][1];
break;
default:
printf("Bad flag %s\n", argv[1]);
exit(1);
}
}
} else {
if (!isalnum(argv[1][0]) || argc > 2) {
printf("Usage: %s [ -hlsuw ] [ user ]\n", cp);
exit(1);
} else
sel_user = argv[1];
}
argc--; argv++;
}
if ((mem = open("/dev/kmem", 0)) < 0) {
fprintf(stderr, "No mem\n");
exit(1);
}
nlist("/unix", nl);
if (nl[0].n_type==0) {
fprintf(stderr, "No namelist\n");
exit(1);
}
if (firstchar != 'u')
readpr();
ut = fopen("/etc/utmp","r");
if (header) {
/* Print time of day */
time(&now);
nowt = localtime(&now);
prtat(nowt);
if (nl[X_BOOTIME].n_type > 0) {
/*
* Print how long system has been up.
* (Found by looking for "bootime" in kernel)
*/
lseek(mem, (long)nl[X_BOOTIME].n_value, 0);
read(mem, &bootime, sizeof (bootime));
uptime = now - bootime;
days = uptime / (60L*60L*24L);
uptime %= (60L*60L*24L);
hrs = uptime / (60L*60L);
uptime %= (60L*60L);
mins = DIV60(uptime);
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 */
while (fread(&utmp, sizeof(utmp), 1, ut)) {
if (utmp.ut_name[0] != '\0')
nusers++;
}
rewind(ut);
printf(" %d user%c", nusers, nusers > 1 ? 's' : '\0');
if (nl[X_AVENRUN].n_type > 0) {
/*
* Print 1, 5, and 15 minute load averages.
* (Found by looking in kernel for avenrun).
*/
printf(", load average:");
lseek(mem, (long)nl[X_AVENRUN].n_value, 0);
read(mem, avenrun, sizeof(avenrun));
for (i = 0; i < (sizeof(avenrun)/sizeof(avenrun[0])); i++) {
load[i] = avenrun[i] / 256.0;
if (i > 0)
printf(",");
printf(" %.2f", load[i]);
}
}
printf("\n");
if (firstchar == 'u')
exit(0);
/* Headers for rest of output */
if (lflag)
printf("User tty login@ idle JCPU PCPU what\n");
else
printf("User tty idle what\n");
fflush(stdout);
}
for (;;) { /* for each entry in utmp */
if (fread(&utmp, sizeof(utmp), 1, ut) == NULL) {
fclose(ut);
exit(0);
}
if (utmp.ut_name[0] == '\0')
continue; /* that tty is free */
if (sel_user && strncmp(utmp.ut_name, sel_user, 8) != 0)
continue; /* we wanted only somebody else */
gettty();
jobtime = 0;
proctime = 0;
strcpy(doing, "-"); /* default act: normally never prints */
empty = 1;
curpid = -1;
idle = findidle();
for (i=0; i<np; i++) { /* for each process on this tty */
if (!(TTYEQ))
continue;
jobtime += pr[i].w_time + pr[i].w_ctime;
proctime += pr[i].w_time;
if (debug) {
printf("\t\t%d\t%s", pr[i].w_pid, pr[i].w_args);
if ((j=pr[i].w_igintr) > 0)
if (j==IGINT)
printf(" &");
else
printf(" & %d %d", j%3, j/3);
printf("\n");
}
if (empty && pr[i].w_igintr!=IGINT) {
empty = 0;
curpid = -1;
}
if(pr[i].w_pid>curpid && (pr[i].w_igintr!=IGINT || empty)){
curpid = pr[i].w_pid;
strcpy(doing, lflag ? pr[i].w_args : pr[i].w_comm);
if (doing[0]==0 || doing[0]=='-' && doing[1]<=' ' || doing[0] == '?') {
strcat(doing, " (");
strcat(doing, pr[i].w_comm);
strcat(doing, ")");
}
}
}
putline();
}
}
/* figure out the major/minor device # pair for this tty */
gettty()
{
char ttybuf[20];
struct stat statbuf;
ttybuf[0] = 0;
strcpy(ttybuf, "/dev/");
strcat(ttybuf, utmp.ut_line);
stat(ttybuf, &statbuf);
tty = statbuf.st_rdev;
}
/*
* putline: print out the accumulated line of info about one user.
*/
putline()
{
register int tm;
/* print login name of the user */
printf("%-8.8s ", utmp.ut_name);
/* print tty user is on */
if (lflag)
/* long form: all (up to) 8 chars */
printf("%-8.8s", utmp.ut_line);
else {
/* short form: 4 chars, skipping 'tty' if there */
if (utmp.ut_line[0]=='t' && utmp.ut_line[1]=='t' && utmp.ut_line[2]=='y')
printf("%-4.4s", &utmp.ut_line[3]);
else
printf("%-4.4s", utmp.ut_line);
}
if (lflag)
/* print when the user logged in */
prtat(localtime(&utmp.ut_time));
/* print idle time */
prttime(idle," ");
if (lflag) {
/* print CPU time for all processes & children */
prttime(DIV60(jobtime)," ");
/* print cpu time for interesting process */
prttime(DIV60(proctime)," ");
}
/* what user is doing, either command tail or args */
printf(" %-.32s\n",doing);
fflush(stdout);
}
/* find & return number of minutes current tty has been idle */
findidle()
{
struct stat stbuf;
long lastaction, diff;
char ttyname[20];
strcpy(ttyname, "/dev/");
strncat(ttyname, utmp.ut_line, 8);
stat(ttyname, &stbuf);
time(&now);
lastaction = stbuf.st_atime;
diff = now - lastaction;
diff = DIV60(diff);
if (diff < 0) diff = 0;
return(diff);
}
/*
* prttime prints a time in hours and minutes.
* The character string tail is printed at the end, obvious
* strings to pass are "", " ", or "am".
*/
prttime(tim, tail)
time_t tim;
char *tail;
{
register int didhrs = 0;
if (tim >= 60) {
printf("%3ld:", tim/60);
didhrs++;
} else {
printf(" ");
}
tim %= 60;
if (tim > 0 || didhrs) {
printf(didhrs&&tim<10 ? "%02ld" : "%2ld", tim);
} else {
printf(" ");
}
printf("%s", tail);
}
/* prtat prints a 12 hour time given a pointer to a time of day */
prtat(p)
struct tm *p;
{
register int pm;
register time_t t;
t = p -> tm_hour;
pm = (t > 11);
if (t > 11)
t -= 12;
if (t == 0)
t = 12;
prttime(t*60 + p->tm_min, pm ? "pm" : "am");
}
/*
* readpr finds and reads in the array pr, containing the interesting
* parts of the proc and user tables for each live process.
*/
readpr()
{
int pn, mf, c, nproc;
int szpt, pfnum, i;
long addr;
#ifdef VIRUS_VFORK
long daddr, saddr;
#endif
daddr_t swplo;
long txtsiz, datsiz, stksiz;
int septxt;
if((swmem = open("/dev/mem", 0)) < 0) {
perror("/dev/mem");
exit(1);
}
if ((swap = open("/dev/swap", 0)) < 0) {
perror("/dev/swap");
exit(1);
}
/*
* read mem to find swap dev.
*/
lseek(mem, (long)nl[X_SWAPDEV].n_value, 0);
read(mem, &nl[X_SWAPDEV].n_value, sizeof(nl[X_SWAPDEV].n_value));
/*
* Find base of swap
*/
lseek(mem, (long)nl[X_SWPLO].n_value, 0);
read(mem, &swplo, sizeof(swplo));
if (nl[X_NPROC].n_value == 0) {
fprintf(stderr, "nproc not in namelist\n");
exit(1);
}
lseek (mem, (off_t) nl[X_NPROC].n_value, 0);
read(mem, (char *)&nproc, sizeof(nproc));
pr = (struct smproc *) malloc(nproc * sizeof(struct smproc));
if (pr == (struct smproc *)NULL) {
fprintf("Not enough memory for proc table\n");
exit(1);
}
/*
* Locate proc table
*/
np = 0;
for (pn=0; pn<nproc; pn++) {
lseek(mem, (long)(nl[X_PROC].n_value + pn*(sizeof mproc)), 0);
pread(mem, &mproc, sizeof mproc, (long)(nl[X_PROC].n_value + pn*(sizeof mproc)));
/* decide if it's an interesting process */
if (mproc.p_stat==0 || mproc.p_pgrp==0)
continue;
#ifdef notdef
/*
* The following improves speed on systems with lots of ttys
* by skipping gettys and inits, but loses when root logs in.
*/
if (mproc.p_ppid == 1 && mproc.p_uid == 0)
continue;
#endif
/* find & read in the user structure */
if (mproc.p_flag&SLOAD) {
addr = ctob((long)mproc.p_addr);
#ifdef VIRUS_VFORK
daddr = ctob((long)mproc.p_daddr);
saddr = ctob((long)mproc.p_saddr);
#endif
file = swmem;
} else {
addr = (mproc.p_addr+swplo)<<9;
#ifdef VIRUS_VFORK
daddr = (mproc.p_daddr+swplo)<<9;
saddr = (mproc.p_saddr+swplo)<<9;
#endif
file = swap;
}
lseek(file, addr, 0);
if (pread(file, (char *)&up, sizeof(up), addr) != sizeof(up))
continue;
if (up.u_ttyp == NULL)
continue;
/* set up address maps for user pcs */
txtsiz = ctob(up.u_tsize);
datsiz = ctob(up.u_dsize);
stksiz = ctob(up.u_ssize);
septxt = up.u_sep;
datmap.b1 = (septxt ? 0 : round(txtsiz,TXTRNDSIZ));
datmap.e1 = datmap.b1+datsiz;
#ifdef VIRUS_VFORK
datmap.f1 = daddr;
#else
datmap.f1 = ctob(USIZE)+addr;
#endif
datmap.b2 = stackbas(stksiz);
datmap.e2 = stacktop(stksiz);
#ifdef VIRUS_VFORK
datmap.f2 = saddr;
#else
datmap.f2 = ctob(USIZE)+(datmap.e1-datmap.b1)+addr;
#endif
/* save the interesting parts */
#ifdef VIRUS_VFORK
pr[np].w_addr = saddr + ctob((long)mproc.p_ssize) - ARGLIST;
#else
pr[np].w_addr = addr + ctob((long)mproc.p_size) - ARGLIST;
#endif
pr[np].w_pid = mproc.p_pid;
pr[np].w_igintr = ((up.u_signal[2]==1) + 2*(up.u_signal[2]>1) + 3*(up.u_signal[3]==1)) + 6*(up.u_signal[3]>1);
pr[np].w_time = up.u_utime + up.u_stime;
pr[np].w_ctime = up.u_cutime + up.u_cstime;
pr[np].w_tty = up.u_ttyd;
up.u_comm[14] = 0; /* Bug: This bombs next field. */
strcpy(pr[np].w_comm, up.u_comm);
/*
* Get args if there's a chance we'll print it.
* Cant just save pointer: getargs returns static place.
* Cant use strncpy: that crock blank pads.
*/
pr[np].w_args[0] = 0;
strncat(pr[np].w_args,getargs(&pr[np]),ARGWIDTH);
if (pr[np].w_args[0]==0 || pr[np].w_args[0]=='-' && pr[np].w_args[1]<=' ' || pr[np].w_args[0] == '?') {
strcat(pr[np].w_args, " (");
strcat(pr[np].w_args, pr[np].w_comm);
strcat(pr[np].w_args, ")");
}
np++;
}
}
/*
* getargs: given a pointer to a proc structure, this looks at the swap area
* and tries to reconstruct the arguments. This is straight out of ps.
*/
char *
getargs(p)
struct smproc *p;
{
int c, nbad;
static char abuf[ARGLIST];
register int *ip;
register char *cp, *cp1;
char **ap;
long addr;
addr = p->w_addr;
/* look for sh special */
lseek(file, addr+ARGLIST-sizeof(char **), 0);
if (read(file, (char *)&ap, sizeof(char *)) != sizeof(char *))
return(NULL);
if (ap) {
char *b = (char *) abuf;
char *bp = b;
while((cp=getptr(ap++)) && cp && (bp<b+ARGWIDTH) ) {
nbad = 0;
while((c=getbyte(cp++)) && (bp<b+ARGWIDTH)) {
if (c<' ' || c>'~') {
if (nbad++>3)
break;
continue;
}
*bp++ = c;
}
*bp++ = ' ';
}
*bp++ = 0;
return(b);
}
lseek(file, addr, 0);
if (pread(file, abuf, sizeof(abuf), addr) != sizeof(abuf))
return(1);
for (ip = (int *) &abuf[ARGLIST]-2; ip > (int *) abuf;) {
/* Look from top for -1 or 0 as terminator flag. */
if (*--ip == -1 || *ip == 0) {
cp = (char *)(ip+1);
if (*cp==0)
cp++;
nbad = 0; /* up to 5 funny chars as ?'s */
for (cp1 = cp; cp1 < (char *)&abuf[ARGLIST]; cp1++) {
c = *cp1&0177;
if (c==0) /* nulls between args => spaces */
*cp1 = ' ';
else if (c < ' ' || c > 0176) {
if (++nbad >= 5) {
*cp1++ = ' ';
break;
}
*cp1 = '?';
} else if (c=='=') { /* Oops - found an
* environment var, back
* over & erase it. */
*cp1 = 0;
while (cp1>cp && *--cp1!=' ')
*cp1 = 0;
break;
}
}
while (*--cp1==' ') /* strip trailing spaces */
*cp1 = 0;
return(cp);
}
}
return (p->w_comm);
}
min(a, b)
{
return (a < b ? a : b);
}
char *
getptr(adr)
char **adr;
{
char *ptr;
register char *p, *pa;
register i;
ptr = 0;
pa = (char *)adr;
p = (char *)&ptr;
for (i=0; i<sizeof(ptr); i++)
*p++ = getbyte(pa++);
return(ptr);
}
getbyte(adr)
char *adr;
{
register struct map *amap = &datmap;
char b;
long saddr;
if(!within(adr, amap->b1, amap->e1)) {
if(within(adr, amap->b2, amap->e2)) {
saddr = (unsigned)adr + amap->f2 - amap->b2;
} else
return(0);
} else
saddr = (unsigned)adr + amap->f1 - amap->b1;
if(lseek(file, saddr, 0)==-1
|| read(file, &b, 1)<1) {
return(0);
}
return((unsigned)b);
}
within(adr,lbd,ubd)
char *adr;
long lbd, ubd;
{
return((unsigned)adr>=lbd && (unsigned)adr<ubd);
}
long
round(a, b)
long a, b;
{
long w = ((a+b-1)/b)*b;
return(w);
}
/*
* pread is like read, but if it's /dev/mem we use the phys
* system call for speed. (On systems without phys we have
* to use regular read.)
*/
pread(fd, ptr, nbytes, loc)
char *ptr;
long loc;
{
int rc;
extern int errno;
if (fd == swmem) {
rc=phys(6, nbytes/64+1, (short)(loc/64));
if (rc>=0) {
memcpy(ptr, 0140000, nbytes);
return nbytes;
} else {
return read(fd, ptr, nbytes);
}
} else {
return read(fd, ptr, nbytes);
}
}
memcpy(dest, src, nbytes)
register char *dest, *src;
register int nbytes;
{
while (nbytes--)
*dest++ = *src++;
}