BSD 4_4_Lite1 release

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

/*-
* Copyright (c) 1990, 1993, 1994
*      The Regents of the University of California.  All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
*    notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
*    notice, this list of conditions and the following disclaimer in the
*    documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
*    must display the following acknowledgement:
*      This product includes software developed by the University of
*      California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
*    may be used to endorse or promote products derived from this software
*    without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/

#ifndef lint
static char copyright[] =
"@(#) Copyright (c) 1990, 1993, 1994\n\
       The Regents of the University of California.  All rights reserved.\n";
#endif /* not lint */

#ifndef lint
static char sccsid[] = "@(#)ps.c        8.4 (Berkeley) 4/2/94";
#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/sysctl.h>

#include <ctype.h>
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <kvm.h>
#include <nlist.h>
#include <paths.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#include "ps.h"

#ifdef P_PPWAIT
#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, needenv;

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

static char     *fmt __P((char **(*)(kvm_t *, const struct kinfo_proc *, int),
                   KINFO *, char *, int));
static char     *kludge_oldps_options __P((char *));
static int       pscomp __P((const void *, const void *));
static void      saveuser __P((KINFO *));
static void      scanvars __P((void));
static void      usage __P((void));

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 %cpu %mem command";

kvm_t *kd;

int
main(argc, argv)
       int argc;
       char *argv[];
{
       struct kinfo_proc *kp;
       struct varent *vent;
       struct winsize ws;
       dev_t ttydev;
       pid_t pid;
       uid_t uid;
       int all, ch, flag, i, fmt, lineno, nentries;
       int prtheader, wflag, what, xflg;
       char *nlistf, *memf, *swapf, errbuf[256];

       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]);

       all = fmt = prtheader = wflag = xflg = 0;
       pid = -1;
       uid = (uid_t) -1;
       ttydev = NODEV;
       memf = nlistf = swapf = NULL;
       while ((ch = getopt(argc, argv,
           "aCeghjLlM:mN:O:o:p:rSTt:uvW:wx")) != EOF)
               switch((char)ch) {
               case 'a':
                       all = 1;
                       break;
               case 'e':                       /* XXX set ufmt */
                       needenv = 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;
                       jfmt[0] = '\0';
                       break;
               case 'L':
                       showkey();
                       exit(0);
               case 'l':
                       parsefmt(lfmt);
                       fmt = 1;
                       lfmt[0] = '\0';
                       break;
               case 'M':
                       memf = optarg;
                       break;
               case 'm':
                       sortby = SORTMEM;
                       break;
               case 'N':
                       nlistf = optarg;
                       break;
               case 'O':
                       parsefmt(o1);
                       parsefmt(optarg);
                       parsefmt(o2);
                       o1[0] = o2[0] = '\0';
                       fmt = 1;
                       break;
               case 'o':
                       parsefmt(optarg);
                       fmt = 1;
                       break;
               case 'p':
                       pid = atol(optarg);
                       xflg = 1;
                       break;
               case 'r':
                       sortby = SORTCPU;
                       break;
               case 'S':
                       sumrusage = 1;
                       break;
               case 'T':
                       if ((optarg = ttyname(STDIN_FILENO)) == NULL)
                               errx(1, "stdin: not a terminal");
                       /* FALLTHROUGH */
               case 't': {
                       struct stat sb;
                       char *ttypath, pathbuf[MAXPATHLEN];

                       if (strcmp(optarg, "co") == 0)
                               ttypath = _PATH_CONSOLE;
                       else if (*optarg != '/')
                               (void)snprintf(ttypath = pathbuf,
                                   sizeof(pathbuf), "%s%s", _PATH_TTY, optarg);
                       else
                               ttypath = optarg;
                       if (stat(ttypath, &sb) == -1)
                               err(1, "%s", ttypath);
                       if (!S_ISCHR(sb.st_mode))
                               errx(1, "%s: not a terminal", ttypath);
                       ttydev = sb.st_rdev;
                       break;
               }
               case 'u':
                       parsefmt(ufmt);
                       sortby = SORTCPU;
                       fmt = 1;
                       ufmt[0] = '\0';
                       break;
               case 'v':
                       parsefmt(vfmt);
                       sortby = SORTMEM;
                       fmt = 1;
                       vfmt[0] = '\0';
                       break;
               case 'W':
                       swapf = optarg;
                       break;
               case 'w':
                       if (wflag)
                               termwidth = UNLIMITED;
                       else if (termwidth < 131)
                               termwidth = 131;
                       wflag++;
                       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
       /*
        * Discard setgid privileges if not the running kernel so that bad
        * guys can't print interesting stuff from kernel memory.
        */
       if (nlistf != NULL || memf != NULL || swapf != NULL)
               setgid(getgid());

       kd = kvm_openfiles(nlistf, memf, swapf, O_RDONLY, errbuf);
       if (kd == 0)
               errx(1, "%s", errbuf);

       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 != (uid_t) -1) {
               what = KERN_PROC_UID;
               flag = uid;
       } else if (ttydev != NODEV) {
               what = KERN_PROC_TTY;
               flag = ttydev;
       } else if (pid != -1) {
               what = KERN_PROC_PID;
               flag = pid;
       } else {
               what = KERN_PROC_ALL;
               flag = 0;
       }
       /*
        * select procs
        */
       if ((kp = kvm_getprocs(kd, what, flag, &nentries)) == 0)
               errx(1, "%s", kvm_geterr(kd));
       if ((kinfo = malloc(nentries * sizeof(*kinfo))) == NULL)
               err(1, NULL);
       for (i = nentries; --i >= 0; ++kp) {
               kinfo[i].ki_p = kp;
               if (needuser)
                       saveuser(&kinfo[i]);
       }
       /*
        * print header
        */
       printheader();
       if (nentries == 0)
               exit(0);
       /*
        * sort proc list
        */
       qsort(kinfo, nentries, sizeof(KINFO), pscomp);
       /*
        * for each proc, call each variable output function.
        */
       for (i = lineno = 0; i < nentries; i++) {
               if (xflg == 0 && (KI_EPROC(&kinfo[i])->e_tdev == NODEV ||
                   (KI_PROC(&kinfo[i])->p_flag & P_CONTROLT ) == 0))
                       continue;
               for (vent = vhead; vent; vent = vent->next) {
                       (vent->var->oproc)(&kinfo[i], vent);
                       if (vent->next != NULL)
                               (void)putchar(' ');
               }
               (void)putchar('\n');
               if (prtheader && lineno++ == prtheader - 4) {
                       (void)putchar('\n');
                       printheader();
                       lineno = 0;
               }
       }
       exit(eval);
}

static void
scanvars()
{
       struct varent *vent;
       VAR *v;
       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--;
}

static char *
fmt(fn, ki, comm, maxlen)
       char **(*fn) __P((kvm_t *, const struct kinfo_proc *, int));
       KINFO *ki;
       char *comm;
       int maxlen;
{
       char *s;

       if ((s =
           fmt_argv((*fn)(kd, ki->ki_p, termwidth), comm, maxlen)) == NULL)
               err(1, NULL);
       return (s);
}

static void
saveuser(ki)
       KINFO *ki;
{
       struct pstats pstats;
       struct usave *usp;

       usp = &ki->ki_u;
       if (kvm_read(kd, (u_long)&KI_PROC(ki)->p_addr->u_stats,
           (char *)&pstats, sizeof(pstats)) == sizeof(pstats)) {
               /*
                * The u-area might be swapped out, and we can't get
                * at it because we have a crashdump and no swap.
                * If it's here fill in these fields, otherwise, just
                * leave them 0.
                */
               usp->u_start = pstats.p_start;
               usp->u_ru = pstats.p_ru;
               usp->u_cru = pstats.p_cru;
               usp->u_valid = 1;
       } else
               usp->u_valid = 0;
       /*
        * save arguments if needed
        */
       if (needcomm)
               ki->ki_args = fmt(kvm_getargv, ki, KI_PROC(ki)->p_comm,
                   MAXCOMLEN);
       else
               ki->ki_args = NULL;
       if (needenv)
               ki->ki_env = fmt(kvm_getenvv, ki, (char *)NULL, 0);
       else
               ki->ki_env = NULL;
}

static int
pscomp(a, b)
       const void *a, *b;
{
       int i;
#ifdef NEWVM
#define VSIZE(k) (KI_EPROC(k)->e_vm.vm_dsize + KI_EPROC(k)->e_vm.vm_ssize + \
                 KI_EPROC(k)->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((KINFO *)b) - getpcpu((KINFO *)a));
       if (sortby == SORTMEM)
               return (VSIZE((KINFO *)b) - VSIZE((KINFO *)a));
       i =  KI_EPROC((KINFO *)a)->e_tdev - KI_EPROC((KINFO *)b)->e_tdev;
       if (i == 0)
               i = KI_PROC((KINFO *)a)->p_pid - KI_PROC((KINFO *)b)->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.
*/
static 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(1, NULL);
       /*
        * 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++;
       memmove(ns, s, (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);
}

static void
usage()
{

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