NetBSD/bin/ps/ps.c

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/* $NetBSD: ps.c,v 1.34 1999/12/04 01:23:09 hubertf Exp $ */
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/*-
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* Copyright (c) 1990, 1993, 1994
* The Regents of the University of California. All rights reserved.
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*
* 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.
*/
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#include <sys/cdefs.h>
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#ifndef lint
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__COPYRIGHT("@(#) Copyright (c) 1990, 1993, 1994\n\
The Regents of the University of California. All rights reserved.\n");
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#endif /* not lint */
#ifndef lint
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#if 0
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static char sccsid[] = "@(#)ps.c 8.4 (Berkeley) 4/2/94";
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#else
__RCSID("$NetBSD: ps.c,v 1.34 1999/12/04 01:23:09 hubertf Exp $");
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#endif
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#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>
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#include <sys/sysctl.h>
#include <ctype.h>
#include <err.h>
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#include <errno.h>
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#include <fcntl.h>
#include <kvm.h>
#include <limits.h>
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#include <nlist.h>
#include <paths.h>
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#include <pwd.h>
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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
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#include <unistd.h>
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#include "ps.h"
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#ifdef P_PPWAIT
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#define NEWVM
#endif
KINFO *kinfo;
struct varent *vhead, *vtail;
int eval; /* exit value */
int rawcpu; /* -C */
int sumrusage; /* -S */
int dontuseprocfs=0; /* -K */
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int termwidth; /* width of screen (0 == infinity) */
int totwidth; /* calculated width of requested variables */
int needuser, needcomm, needenv, commandonly, use_procfs;
uid_t myuid;
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enum sort { DEFAULT, SORTMEM, SORTCPU } sortby = DEFAULT;
static KINFO *getkinfo_kvm __P((kvm_t *, int, int, int *, int));
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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));
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int main __P((int, char *[]));
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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";
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char vfmt[] = "pid state time sl re pagein vsz rss lim tsiz %cpu %mem command";
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kvm_t *kd;
int
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main(argc, argv)
int argc;
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char *argv[];
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{
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struct varent *vent;
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struct winsize ws;
gid_t egid = getegid();
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int ch, flag, i, fmt, lineno, nentries;
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int prtheader, wflag, what, xflg;
char *nlistf, *memf, *swapf, errbuf[_POSIX2_LINE_MAX];
char *ttname;
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(void)setegid(getgid());
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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]);
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fmt = prtheader = wflag = xflg = 0;
what = KERN_PROC_UID;
flag = myuid = getuid();
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memf = nlistf = swapf = NULL;
while ((ch = getopt(argc, argv,
"acCeghjKLlM:mN:O:o:p:rSTt:U:uvW:wx")) != -1)
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switch((char)ch) {
case 'a':
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what = KERN_PROC_ALL;
flag = 0;
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break;
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case 'c':
commandonly = 1;
break;
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case 'e': /* XXX set ufmt */
needenv = 1;
break;
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case 'C':
rawcpu = 1;
break;
case 'g':
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break; /* no-op */
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case 'h':
prtheader = ws.ws_row > 5 ? ws.ws_row : 22;
break;
case 'j':
parsefmt(jfmt);
fmt = 1;
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jfmt[0] = '\0';
break;
case 'K':
dontuseprocfs=1;
break;
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case 'L':
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showkey();
exit(0);
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/* NOTREACHED */
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case 'l':
parsefmt(lfmt);
fmt = 1;
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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;
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break;
case 'o':
parsefmt(optarg);
fmt = 1;
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break;
case 'p':
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what = KERN_PROC_PID;
flag = atol(optarg);
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xflg = 1;
break;
case 'r':
sortby = SORTCPU;
break;
case 'S':
sumrusage = 1;
break;
case 'T':
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if ((ttname = ttyname(STDIN_FILENO)) == NULL)
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errx(1, "stdin: not a terminal");
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goto tty;
case 't':
ttname = optarg;
tty: {
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struct stat sb;
char *ttypath, pathbuf[MAXPATHLEN];
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if (strcmp(ttname, "co") == 0)
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ttypath = _PATH_CONSOLE;
else if (*ttname != '/')
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(void)snprintf(ttypath = pathbuf,
sizeof(pathbuf), "%s%s", _PATH_TTY, ttname);
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else
ttypath = ttname;
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if (stat(ttypath, &sb) == -1)
err(1, "%s", ttypath);
if (!S_ISCHR(sb.st_mode))
errx(1, "%s: not a terminal", ttypath);
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what = KERN_PROC_TTY;
flag = sb.st_rdev;
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break;
}
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case 'U':
if (*optarg != '\0') {
struct passwd *pw;
char *ep;
what = KERN_PROC_UID;
pw = getpwnam(optarg);
if (pw == NULL) {
errno = 0;
flag = strtoul(optarg, &ep, 10);
if (errno)
err(1, "%s", optarg);
if (*ep != '\0')
errx(1, "%s: illegal user name",
optarg);
} else
flag = pw->pw_uid;
}
break;
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case 'u':
parsefmt(ufmt);
sortby = SORTCPU;
fmt = 1;
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ufmt[0] = '\0';
break;
case 'v':
parsefmt(vfmt);
sortby = SORTMEM;
fmt = 1;
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vfmt[0] = '\0';
break;
case 'W':
swapf = optarg;
break;
case 'w':
if (wflag)
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termwidth = UNLIMITED;
else if (termwidth < 131)
termwidth = 131;
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wflag++;
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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
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/*
* Discard setgid privileges. If not the running kernel, we toss
* them away totally so that bad guys can't print interesting stuff
* from kernel memory, otherwise switch back to kmem for the
* duration of the kvm_openfiles() call.
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*/
if (nlistf != NULL || memf != NULL || swapf != NULL)
(void)setgid(getgid());
else
(void)setegid(egid);
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kd = kvm_openfiles(nlistf, memf, swapf, O_RDONLY, errbuf);
if (kd == 0) {
if (dontuseprocfs)
errx(1, "%s", errbuf);
else {
warnx("kvm_openfiles: %s", errbuf);
fprintf(stderr, "ps: falling back to /proc-based lookup\n");
}
}
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if (nlistf == NULL && memf == NULL && swapf == NULL)
(void)setgid(getgid());
if (!fmt)
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parsefmt(dfmt);
/*
* scan requested variables, noting what structures are needed,
* and adjusting header widths as appropiate.
*/
scanvars();
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/*
* select procs
*/
if (!kd || !(kinfo = getkinfo_kvm(kd, what, flag, &nentries, needuser)))
{
/* If/when the /proc-based code is ripped out
* again, make sure all references to the -K
* option are also pulled (getopt(), usage(),
* man page). See the man page comments about
* this for more details. */
/* sysctl() ought to provide some sort of
* always-working-but-minimal-functionality
* method of providing at least some of the
* process information. Unfortunately, such a
* change will require too much work to be put
* into 1.4. For now, enable this experimental
* /proc-based support instead (if /proc is
* mounted) to grab as much information as we can.
* The guts of emulating kvm_getprocs() is in
* the file procfs_ops.c. */
if (kd)
warnx("%s.", kvm_geterr(kd));
if (dontuseprocfs) {
exit(1);
}
/* procfs_getprocs supports all but the
* KERN_PROC_RUID flag. */
kinfo = getkinfo_procfs(what, flag, &nentries);
if (kinfo == 0) {
errx(1, "fallback /proc-based lookup also failed. %s",
"Giving up...");
}
fprintf(stderr, "%s%s",
"Warning: /proc does not provide ",
"valid data for all fields.\n");
use_procfs = 1;
}
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/*
* print header
*/
printheader();
if (nentries == 0)
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exit(0);
/*
* sort proc list
*/
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qsort(kinfo, nentries, sizeof(KINFO), pscomp);
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/*
* for each proc, call each variable output function.
*/
for (i = lineno = 0; i < nentries; i++) {
KINFO *ki = &kinfo[i];
if (xflg == 0 && (KI_EPROC(ki)->e_tdev == NODEV ||
(KI_PROC(ki)->p_flag & P_CONTROLT ) == 0))
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continue;
for (vent = vhead; vent; vent = vent->next) {
(vent->var->oproc)(ki, vent);
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if (vent->next != NULL)
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(void)putchar(' ');
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}
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(void)putchar('\n');
if (prtheader && lineno++ == prtheader - 4) {
(void)putchar('\n');
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printheader();
lineno = 0;
}
}
exit(eval);
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/* NOTREACHED */
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}
static KINFO *
getkinfo_kvm(kd, what, flag, nentriesp, needuser)
kvm_t *kd;
int what, flag, *nentriesp, needuser;
{
struct kinfo_proc *kp;
KINFO *kinfo=NULL;
size_t i;
if ((kp = kvm_getprocs(kd, what, flag, nentriesp)) != 0)
{
if ((kinfo = malloc((*nentriesp) * sizeof(*kinfo))) == NULL)
err(1, NULL);
for (i = (*nentriesp); i-- > 0; kp++) {
kinfo[i].ki_p = kp;
if (needuser)
saveuser(&kinfo[i]);
}
}
return (kinfo);
}
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static void
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scanvars()
{
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struct varent *vent;
VAR *v;
int i;
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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--;
}
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static void
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saveuser(ki)
KINFO *ki;
{
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struct pstats pstats;
struct usave *usp;
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usp = &ki->ki_u;
if (kvm_read(kd, (u_long)&KI_PROC(ki)->p_addr->u_stats,
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(char *)&pstats, sizeof(pstats)) == sizeof(pstats)) {
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/*
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* 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.
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*/
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usp->u_start = pstats.p_start;
usp->u_ru = pstats.p_ru;
usp->u_cru = pstats.p_cru;
usp->u_valid = 1;
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} else
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usp->u_valid = 0;
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}
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static int
pscomp(a, b)
const void *a, *b;
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{
int i;
#ifdef NEWVM
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#define VSIZE(k) (KI_EPROC(k)->e_vm.vm_dsize + KI_EPROC(k)->e_vm.vm_ssize + \
KI_EPROC(k)->e_vm.vm_tsize)
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#else
#define VSIZE(k) ((k)->ki_p->p_dsize + (k)->ki_p->p_ssize + (k)->ki_e->e_xsize)
#endif
if (sortby == SORTCPU)
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return (getpcpu((KINFO *)b) - getpcpu((KINFO *)a));
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if (sortby == SORTMEM)
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return (VSIZE((KINFO *)b) - VSIZE((KINFO *)a));
i = KI_EPROC((KINFO *)a)->e_tdev - KI_EPROC((KINFO *)b)->e_tdev;
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if (i == 0)
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i = KI_PROC((KINFO *)a)->p_pid - KI_PROC((KINFO *)b)->p_pid;
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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
*
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* The old convention that 't' with no trailing tty arg means the user's
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* 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.
*/
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static char *
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kludge_oldps_options(s)
char *s;
{
size_t len;
char *newopts, *ns, *cp;
len = strlen(s);
if ((newopts = ns = malloc(len + 3)) == NULL)
err(1, NULL);
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/*
* 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++;
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memmove(ns, s, (size_t)(cp - s)); /* copy up to trailing number */
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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.
*/
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if (isdigit(*cp) &&
(cp == s || (cp[-1] != 'U' && cp[-1] != 't' && cp[-1] != 'p' &&
(cp - 1 == s || cp[-2] != 't'))))
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*ns++ = 'p';
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/* and append the number */
(void)strcpy(ns, cp); /* XXX strcpy is safe */
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return (newopts);
}
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static void
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usage()
{
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(void)fprintf(stderr,
"usage:\t%s\n\t %s\n\t%s\n",
"ps [-aChjKlmrSTuvwx] [-O|o fmt] [-p pid] [-t tty]",
"[-M core] [-N system] [-W swap] [-U username]",
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"ps [-L]");
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exit(1);
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/* NOTREACHED */
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}