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

/*-
* Copyright (c) 1990 The Regents of the University of California.
* All rights reserved.
*
* %sccs.include.redist.c%
*/

#ifndef lint
char copyright[] =
"@(#) Copyright (c) 1990 The Regents of the University of California.\n\
All rights reserved.\n";
#endif /* not lint */

#ifndef lint
static char sccsid[] = "@(#)ps.c        5.42 (Berkeley) %G%";
#endif /* not lint */

#include <sys/param.h>
#include <sys/user.h>
#include <sys/time.h>
#include <sys/resource.h>
#include <sys/proc.h>
#include <sys/stat.h>
#include <sys/ioctl.h>
#include <sys/kinfo.h>
#include <nlist.h>
#include <kvm.h>
#include <errno.h>
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <paths.h>
#include "ps.h"

#ifdef SPPWAIT
#define NEWVM
#endif

KINFO *kinfo;
struct varent *vhead, *vtail;

int     eval;                   /* exit value */
int     rawcpu;                 /* -C */
int     sumrusage;              /* -S */
int     termwidth;              /* width of screen (0 == infinity) */
int     totwidth;               /* calculated width of requested variables */

static int needuser, needcomm;

enum sort { DEFAULT, SORTMEM, SORTCPU } sortby = DEFAULT;

uid_t   getuid();
char    *ttyname();

char dfmt[] = "pid tt state time command";
char jfmt[] = "user pid ppid pgid sess jobc state tt time command";
char lfmt[] = "uid pid ppid cpu pri nice vsz rss wchan state tt time command";
char   o1[] = "pid";
char   o2[] = "tt state time command";
char ufmt[] = "user pid %cpu %mem vsz rss tt state start time command";
char vfmt[] =
       "pid state time sl re pagein vsz rss lim tsiz trs %cpu %mem command";

main(argc, argv)
       int argc;
       char **argv;
{
       extern char *optarg;
       extern int optind;
       register struct proc *p;
       register size_t nentries;
       register struct varent *vent;
       register int i;
       struct winsize ws;
       dev_t ttydev;
       int all, ch, flag, fmt, lineno, pid, prtheader, uid, what, xflg;
       int pscomp();
       char *nlistf, *memf, *swapf;
       char *kludge_oldps_options();

       if ((ioctl(STDOUT_FILENO, TIOCGWINSZ, (char *)&ws) == -1 &&
            ioctl(STDERR_FILENO, TIOCGWINSZ, (char *)&ws) == -1 &&
            ioctl(STDIN_FILENO,  TIOCGWINSZ, (char *)&ws) == -1) ||
            ws.ws_col == 0)
               termwidth = 79;
       else
               termwidth = ws.ws_col - 1;

       if (argc > 1)
               argv[1] = kludge_oldps_options(argv[1]);

       fmt = 0;
       all = xflg = 0;
       pid = uid = -1;
       ttydev = NODEV;
       memf = nlistf = swapf = NULL;
       while ((ch = getopt(argc, argv,
           "aCghjLlM:mN:O:o:p:rSTt:uvW:wx")) != EOF)
               switch((char)ch) {
               case 'a':
                       all = 1;
                       break;
               case 'C':
                       rawcpu = 1;
                       break;
               case 'g':
                       break;  /* no-op */
               case 'h':
                       prtheader = ws.ws_row > 5 ? ws.ws_row : 22;
                       break;
               case 'j':
                       parsefmt(jfmt);
                       fmt = 1;
                       break;
               case 'L': 
                       showkey();
                       exit(0);
               case 'l':
                       parsefmt(lfmt);
                       fmt = 1;
                       break;
               case 'M':
                       memf = optarg;
                       break;
               case 'm':
                       sortby = SORTMEM;
                       break;
               case 'N':
                       nlistf = optarg;
                       break;
               case 'O':
                       parsefmt(o1);
                       parsefmt(optarg);
                       parsefmt(o2);
                       fmt = 1;
                       break;
               case 'o':
                       parsefmt(optarg);
                       fmt = 1;
                       break;
               case 'p':
                       pid = atoi(optarg);
                       xflg = 1;
                       break;
               case 'r':
                       sortby = SORTCPU;
                       break;
               case 'S':
                       sumrusage = 1;
                       break;
               case 'T':
                       if ((optarg = ttyname(STDIN_FILENO)) == NULL)
                               err("stdin: not a terminal");
                       /* FALLTHROUGH */
               case 't': {
                       char *ttypath;
                       struct stat stbuf;
                       char pathbuf[MAXPATHLEN];

                       if (strcmp(optarg, "co") == 0)
                               ttypath = _PATH_CONSOLE;
                       else if (*optarg != '/')
                               (void) sprintf(ttypath = pathbuf, "%s%s",
                                   _PATH_TTY, optarg);
                       else
                               ttypath = optarg;
                       if (stat(ttypath, &stbuf) == -1)
                               err("%s: %s", ttypath, strerror(errno));
                       if (!S_ISCHR(stbuf.st_mode))
                               err("%s: not a terminal", ttypath);
                       ttydev = stbuf.st_rdev;
                       break;
               }
               case 'u':
                       parsefmt(ufmt);
                       sortby = SORTCPU;
                       fmt = 1;
                       break;
               case 'v':
                       parsefmt(vfmt);
                       sortby = SORTMEM;
                       fmt = 1;
                       break;
               case 'W':
                       swapf = optarg;
                       break;
               case 'w':
                       if (termwidth < 131)
                               termwidth = 131;
                       else
                               termwidth = UNLIMITED;
                       break;
               case 'x':
                       xflg = 1;
                       break;
               case '?':
               default:
                       usage();
               }
       argc -= optind;
       argv += optind;

#define BACKWARD_COMPATIBILITY
#ifdef  BACKWARD_COMPATIBILITY
       if (*argv) {

               nlistf = *argv;
               if (*++argv) {
                       memf = *argv;
                       if (*++argv)
                               swapf = *argv;
               }
       }
#endif
       if (kvm_openfiles(nlistf, memf, swapf) == -1)
               err("kvm_openfiles: %s", kvm_geterr());

       if (!fmt)
               parsefmt(dfmt);

       if (!all && ttydev == NODEV && pid == -1)  /* XXX - should be cleaner */
               uid = getuid();

       /*
        * scan requested variables, noting what structures are needed,
        * and adjusting header widths as appropiate.
        */
       scanvars();
       /*
        * get proc list
        */
       if (uid != -1) {
               what = KINFO_PROC_UID;
               flag = uid;
       } else if (ttydev != NODEV) {
               what = KINFO_PROC_TTY;
               flag = ttydev;
       } else if (pid != -1) {
               what = KINFO_PROC_PID;
               flag = pid;
       /*
        * select procs
        */
       if ((nentries = kvm_getprocs(what, flag)) == -1)
               err("%s", kvm_geterr());
       kinfo = malloc(nentries * sizeof(KINFO));
       if (kinfo == NULL)
               err("%s", strerror(errno));
       for (nentries = 0; p = kvm_nextproc(); ++nentries) {
               kinfo[nentries].ki_p = p;
               kinfo[nentries].ki_e = kvm_geteproc(p);
               if (needuser)
                       saveuser(&kinfo[nentries]);
       }
       /*
        * print header
        */
       printheader();
       if (nentries == 0)
               exit(0);
       /*
        * sort proc list
        */
       qsort((void *)kinfo, nentries, sizeof(KINFO), pscomp);
       /*
        * for each proc, call each variable output function.
        */
       for (i = lineno = 0; i < nentries; i++) {
               if (xflg == 0 && (kinfo[i].ki_e->e_tdev == NODEV ||
                   (kinfo[i].ki_p->p_flag & SCTTY ) == 0))
                       continue;
               for (vent = vhead; vent; vent = vent->next) {
                       (*vent->var->oproc)(&kinfo[i], vent->var, vent->next);
                       if (vent->next != NULL)
                               (void) putchar(' ');
               }
               (void) putchar('\n');
               if (prtheader && lineno++ == prtheader-4) {
                       (void) putchar('\n');
                       printheader();
                       lineno = 0;
               }
       }
       exit(eval);
}

scanvars()
{
       register struct varent *vent;
       register VAR *v;
       register int i;

       for (vent = vhead; vent; vent = vent->next) {
               v = vent->var;
               i = strlen(v->header);
               if (v->width < i)
                       v->width = i;
               totwidth += v->width + 1;       /* +1 for space */
               if (v->flag & USER)
                       needuser = 1;
               if (v->flag & COMM)
                       needcomm = 1;
       }
       totwidth--;
}


/* XXX - redo */
saveuser(ki)
       KINFO *ki;
{
       register struct usave *usp;
       register struct user *up;

       if ((usp = calloc(1, sizeof(struct usave))) == NULL)
               err("%s", strerror(errno));
       ki->ki_u = usp;
       up = kvm_getu(ki->ki_p);
       /*
        * save arguments if needed
        */
       ki->ki_args = needcomm ? strdup(kvm_getargs(ki->ki_p, up)) : NULL;
       if (up != NULL) {
               /*
                * save important fields
                */
#ifdef NEWVM
               usp->u_start = up->u_stats.p_start;
               usp->u_ru = up->u_stats.p_ru;
               usp->u_cru = up->u_stats.p_cru;
#else
               usp->u_procp = up->u_procp;
               usp->u_start = up->u_start;
               usp->u_ru = up->u_ru;
               usp->u_cru = up->u_cru;
               usp->u_acflag = up->u_acflag;
#endif
       }
}

pscomp(k1, k2)
       KINFO *k1, *k2;
{
       int i;
#ifdef NEWVM
#define VSIZE(k) ((k)->ki_e->e_vm.vm_dsize + (k)->ki_e->e_vm.vm_ssize + \
                 (k)->ki_e->e_vm.vm_tsize)
#else
#define VSIZE(k) ((k)->ki_p->p_dsize + (k)->ki_p->p_ssize + (k)->ki_e->e_xsize)
#endif

       if (sortby == SORTCPU)
               return (getpcpu(k2) - getpcpu(k1));
       if (sortby == SORTMEM)
               return (VSIZE(k2) - VSIZE(k1));
       i =  k1->ki_e->e_tdev - k2->ki_e->e_tdev;
       if (i == 0)
               i = k1->ki_p->p_pid - k2->ki_p->p_pid;
       return (i);
}

/*
* ICK (all for getopt), would rather hide the ugliness
* here than taint the main code.
*
*  ps foo -> ps -foo
*  ps 34 -> ps -p34
*
* The old convention that 't' with no trailing tty arg means the users
* tty, is only supported if argv[1] doesn't begin with a '-'.  This same
* feature is available with the option 'T', which takes no argument.
*/
char *
kludge_oldps_options(s)
       char *s;
{
       size_t len;
       char *newopts, *ns, *cp;

       len = strlen(s);
       if ((newopts = ns = malloc(len + 2)) == NULL)
               err("%s", strerror(errno));
       /*
        * options begin with '-'
        */
       if (*s != '-')
               *ns++ = '-';    /* add option flag */
       /*
        * gaze to end of argv[1]
        */
       cp = s + len - 1;
       /*
        * if last letter is a 't' flag with no argument (in the context
        * of the oldps options -- option string NOT starting with a '-' --
        * then convert to 'T' (meaning *this* terminal, i.e. ttyname(0)).
        */
       if (*cp == 't' && *s != '-')
               *cp = 'T';
       else {
               /*
                * otherwise check for trailing number, which *may* be a
                * pid.
                */
               while (cp >= s && isdigit(*cp))
                       --cp;
       }
       cp++;
       bcopy(s, ns, (size_t)(cp - s)); /* copy up to trailing number */
       ns += cp - s;
       /*
        * if there's a trailing number, and not a preceding 'p' (pid) or
        * 't' (tty) flag, then assume it's a pid and insert a 'p' flag.
        */
       if (isdigit(*cp) && (cp == s || cp[-1] != 't' && cp[-1] != 'p' &&
           (cp - 1 == s || cp[-2] != 't')))
               *ns++ = 'p';
       (void) strcpy(ns, cp);          /* and append the number */

       return (newopts);
}

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

void
#if __STDC__
err(const char *fmt, ...)
#else
err(fmt, va_alist)
       char *fmt;
       va_dcl
#endif
{
       va_list ap;
#if __STDC__
       va_start(ap, fmt);
#else
       va_start(ap);
#endif
       (void)fprintf(stderr, "ps: ");
       (void)vfprintf(stderr, fmt, ap);
       va_end(ap);
       (void)fprintf(stderr, "\n");
       exit(1);
       /* NOTREACHED */
}

usage()
{
       (void) fprintf(stderr,
"usage: ps [-aChjlmrSTuvwx] [-O|o fmt] [-p pid] [-t tty]\n\t  [-M core] [-N system] [-W swap]\n       ps [-L]\n");
       exit(1);
}