ps.c revision 11809 
1/*-
2 * Copyright (c) 1990, 1993, 1994
3 *	The Regents of the University of California.  All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 *    must display the following acknowledgement:
15 *	This product includes software developed by the University of
16 *	California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 *    may be used to endorse or promote products derived from this software
19 *    without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 *
33 *	$Id: ps.c,v 1.8 1995/10/23 21:06:31 ache Exp $
34 */
35
36#ifndef lint
37static char copyright[] =
38"@(#) Copyright (c) 1990, 1993, 1994\n\
39	The Regents of the University of California.  All rights reserved.\n";
40#endif /* not lint */
41
42#ifndef lint
43static char sccsid[] = "@(#)ps.c	8.4 (Berkeley) 4/2/94";
44#endif /* not lint */
45
46#include <sys/param.h>
47#include <sys/user.h>
48#include <sys/time.h>
49#include <sys/resource.h>
50#include <sys/proc.h>
51#include <sys/stat.h>
52#include <sys/ioctl.h>
53#include <sys/sysctl.h>
54
55#include <ctype.h>
56#include <err.h>
57#include <errno.h>
58#include <fcntl.h>
59#include <kvm.h>
60#include <nlist.h>
61#include <paths.h>
62#include <stdio.h>
63#include <stdlib.h>
64#include <string.h>
65#include <unistd.h>
66#include <locale.h>
67
68#include "ps.h"
69
70#ifdef P_PPWAIT
71#define NEWVM
72#endif
73
74KINFO *kinfo;
75struct varent *vhead, *vtail;
76
77int	eval;			/* exit value */
78int	rawcpu;			/* -C */
79int	sumrusage;		/* -S */
80int	termwidth;		/* width of screen (0 == infinity) */
81int	totwidth;		/* calculated width of requested variables */
82
83static int needuser, needcomm, needenv;
84
85enum sort { DEFAULT, SORTMEM, SORTCPU } sortby = DEFAULT;
86
87static char	*fmt __P((char **(*)(kvm_t *, const struct kinfo_proc *, int),
88		    KINFO *, char *, int));
89static char	*kludge_oldps_options __P((char *));
90static int	 pscomp __P((const void *, const void *));
91static void	 saveuser __P((KINFO *));
92static void	 scanvars __P((void));
93static void	 usage __P((void));
94
95char dfmt[] = "pid tt state time command";
96char jfmt[] = "user pid ppid pgid sess jobc state tt time command";
97char lfmt[] = "uid pid ppid cpu pri nice vsz rss wchan state tt time command";
98char   o1[] = "pid";
99char   o2[] = "tt state time command";
100char ufmt[] = "user pid %cpu %mem vsz rss tt state start time command";
101char vfmt[] = "pid state time sl re pagein vsz rss lim tsiz %cpu %mem command";
102
103kvm_t *kd;
104
105int
106main(argc, argv)
107	int argc;
108	char *argv[];
109{
110	struct kinfo_proc *kp;
111	struct varent *vent;
112	struct winsize ws;
113	dev_t ttydev;
114	pid_t pid;
115	uid_t uid;
116	int all, ch, flag, i, fmt, lineno, nentries;
117	int prtheader, wflag, what, xflg;
118	char *nlistf, *memf, *swapf, errbuf[256];
119
120	(void) setlocale(LC_ALL, "");
121
122	if ((ioctl(STDOUT_FILENO, TIOCGWINSZ, (char *)&ws) == -1 &&
123	     ioctl(STDERR_FILENO, TIOCGWINSZ, (char *)&ws) == -1 &&
124	     ioctl(STDIN_FILENO,  TIOCGWINSZ, (char *)&ws) == -1) ||
125	     ws.ws_col == 0)
126		termwidth = 79;
127	else
128		termwidth = ws.ws_col - 1;
129
130	if (argc > 1)
131		argv[1] = kludge_oldps_options(argv[1]);
132
133	all = fmt = prtheader = wflag = xflg = 0;
134	pid = -1;
135	uid = (uid_t) -1;
136	ttydev = NODEV;
137	memf = nlistf = swapf = NULL;
138	while ((ch = getopt(argc, argv,
139	    "aCeghjLlM:mN:O:o:p:rSTt:uvW:wx")) != EOF)
140		switch((char)ch) {
141		case 'a':
142			all = 1;
143			break;
144		case 'e':			/* XXX set ufmt */
145			needenv = 1;
146			break;
147		case 'C':
148			rawcpu = 1;
149			break;
150		case 'g':
151			break;			/* no-op */
152		case 'h':
153			prtheader = ws.ws_row > 5 ? ws.ws_row : 22;
154			break;
155		case 'j':
156			parsefmt(jfmt);
157			fmt = 1;
158			jfmt[0] = '\0';
159			break;
160		case 'L':
161			showkey();
162			exit(0);
163		case 'l':
164			parsefmt(lfmt);
165			fmt = 1;
166			lfmt[0] = '\0';
167			break;
168		case 'M':
169			memf = optarg;
170			break;
171		case 'm':
172			sortby = SORTMEM;
173			break;
174		case 'N':
175			nlistf = optarg;
176			break;
177		case 'O':
178			parsefmt(o1);
179			parsefmt(optarg);
180			parsefmt(o2);
181			o1[0] = o2[0] = '\0';
182			fmt = 1;
183			break;
184		case 'o':
185			parsefmt(optarg);
186			fmt = 1;
187			break;
188		case 'p':
189			pid = atol(optarg);
190			xflg = 1;
191			break;
192		case 'r':
193			sortby = SORTCPU;
194			break;
195		case 'S':
196			sumrusage = 1;
197			break;
198		case 'T':
199			if ((optarg = ttyname(STDIN_FILENO)) == NULL)
200				errx(1, "stdin: not a terminal");
201			/* FALLTHROUGH */
202		case 't': {
203			struct stat sb;
204			char *ttypath, pathbuf[MAXPATHLEN];
205
206			if (strcmp(optarg, "co") == 0)
207				ttypath = _PATH_CONSOLE;
208			else if (*optarg != '/')
209				(void)snprintf(ttypath = pathbuf,
210				    sizeof(pathbuf), "%s%s", _PATH_TTY, optarg);
211			else
212				ttypath = optarg;
213			if (stat(ttypath, &sb) == -1)
214				err(1, "%s", ttypath);
215			if (!S_ISCHR(sb.st_mode))
216				errx(1, "%s: not a terminal", ttypath);
217			ttydev = sb.st_rdev;
218			break;
219		}
220		case 'u':
221			parsefmt(ufmt);
222			sortby = SORTCPU;
223			fmt = 1;
224			ufmt[0] = '\0';
225			break;
226		case 'v':
227			parsefmt(vfmt);
228			sortby = SORTMEM;
229			fmt = 1;
230			vfmt[0] = '\0';
231			break;
232		case 'W':
233			swapf = optarg;
234			break;
235		case 'w':
236			if (wflag)
237				termwidth = UNLIMITED;
238			else if (termwidth < 131)
239				termwidth = 131;
240			wflag++;
241			break;
242		case 'x':
243			xflg = 1;
244			break;
245		case '?':
246		default:
247			usage();
248		}
249	argc -= optind;
250	argv += optind;
251
252#define	BACKWARD_COMPATIBILITY
253#ifdef	BACKWARD_COMPATIBILITY
254	if (*argv) {
255		nlistf = *argv;
256		if (*++argv) {
257			memf = *argv;
258			if (*++argv)
259				swapf = *argv;
260		}
261	}
262#endif
263	/*
264	 * Discard setgid privileges if not the running kernel so that bad
265	 * guys can't print interesting stuff from kernel memory.
266	 */
267	if (nlistf != NULL || memf != NULL || swapf != NULL)
268		setgid(getgid());
269
270	kd = kvm_openfiles(nlistf, memf, swapf, O_RDONLY, errbuf);
271	if (kd == 0)
272		errx(1, "%s", errbuf);
273
274	if (!fmt)
275		parsefmt(dfmt);
276
277	if (!all && ttydev == NODEV && pid == -1)  /* XXX - should be cleaner */
278		uid = getuid();
279
280	/*
281	 * scan requested variables, noting what structures are needed,
282	 * and adjusting header widths as appropiate.
283	 */
284	scanvars();
285	/*
286	 * get proc list
287	 */
288	if (uid != (uid_t) -1) {
289		what = KERN_PROC_UID;
290		flag = uid;
291	} else if (ttydev != NODEV) {
292		what = KERN_PROC_TTY;
293		flag = ttydev;
294	} else if (pid != -1) {
295		what = KERN_PROC_PID;
296		flag = pid;
297	} else {
298		what = KERN_PROC_ALL;
299		flag = 0;
300	}
301	/*
302	 * select procs
303	 */
304	if ((kp = kvm_getprocs(kd, what, flag, &nentries)) == 0)
305		errx(1, "%s", kvm_geterr(kd));
306	if ((kinfo = malloc(nentries * sizeof(*kinfo))) == NULL)
307		err(1, NULL);
308	for (i = nentries; --i >= 0; ++kp) {
309		kinfo[i].ki_p = kp;
310		if (needuser)
311			saveuser(&kinfo[i]);
312	}
313	/*
314	 * print header
315	 */
316	printheader();
317	if (nentries == 0)
318		exit(0);
319	/*
320	 * sort proc list
321	 */
322	qsort(kinfo, nentries, sizeof(KINFO), pscomp);
323	/*
324	 * for each proc, call each variable output function.
325	 */
326	for (i = lineno = 0; i < nentries; i++) {
327		if (xflg == 0 && (KI_EPROC(&kinfo[i])->e_tdev == NODEV ||
328		    (KI_PROC(&kinfo[i])->p_flag & P_CONTROLT ) == 0))
329			continue;
330		for (vent = vhead; vent; vent = vent->next) {
331			(vent->var->oproc)(&kinfo[i], vent);
332			if (vent->next != NULL)
333				(void)putchar(' ');
334		}
335		(void)putchar('\n');
336		if (prtheader && lineno++ == prtheader - 4) {
337			(void)putchar('\n');
338			printheader();
339			lineno = 0;
340		}
341	}
342	exit(eval);
343}
344
345static void
346scanvars()
347{
348	struct varent *vent;
349	VAR *v;
350	int i;
351
352	for (vent = vhead; vent; vent = vent->next) {
353		v = vent->var;
354		i = strlen(v->header);
355		if (v->width < i)
356			v->width = i;
357		totwidth += v->width + 1;	/* +1 for space */
358		if (v->flag & USER)
359			needuser = 1;
360		if (v->flag & COMM)
361			needcomm = 1;
362	}
363	totwidth--;
364}
365
366static char *
367fmt(fn, ki, comm, maxlen)
368	char **(*fn) __P((kvm_t *, const struct kinfo_proc *, int));
369	KINFO *ki;
370	char *comm;
371	int maxlen;
372{
373	char *s;
374
375	if ((s =
376	    fmt_argv((*fn)(kd, ki->ki_p, termwidth), comm, maxlen)) == NULL)
377		err(1, NULL);
378	return (s);
379}
380
381static void
382saveuser(ki)
383	KINFO *ki;
384{
385	struct pstats pstats;
386	struct usave *usp;
387	struct user *u_addr = (struct user *)USRSTACK;
388
389	usp = &ki->ki_u;
390	if (kvm_uread(kd, KI_PROC(ki), (unsigned long)&u_addr->u_stats,
391	    (char *)&pstats, sizeof(pstats)) == sizeof(pstats)) {
392		/*
393		 * The u-area might be swapped out, and we can't get
394		 * at it because we have a crashdump and no swap.
395		 * If it's here fill in these fields, otherwise, just
396		 * leave them 0.
397		 */
398		usp->u_start = pstats.p_start;
399		usp->u_ru = pstats.p_ru;
400		usp->u_cru = pstats.p_cru;
401		usp->u_valid = 1;
402	} else
403		usp->u_valid = 0;
404	/*
405	 * save arguments if needed
406	 */
407	if (needcomm)
408		ki->ki_args = fmt(kvm_getargv, ki, KI_PROC(ki)->p_comm,
409		    MAXCOMLEN);
410	else
411		ki->ki_args = NULL;
412	if (needenv)
413		ki->ki_env = fmt(kvm_getenvv, ki, (char *)NULL, 0);
414	else
415		ki->ki_env = NULL;
416}
417
418static int
419pscomp(a, b)
420	const void *a, *b;
421{
422	int i;
423#ifdef NEWVM
424#define VSIZE(k) (KI_EPROC(k)->e_vm.vm_dsize + KI_EPROC(k)->e_vm.vm_ssize + \
425		  KI_EPROC(k)->e_vm.vm_tsize)
426#else
427#define VSIZE(k) ((k)->ki_p->p_dsize + (k)->ki_p->p_ssize + (k)->ki_e->e_xsize)
428#endif
429
430	if (sortby == SORTCPU)
431		return (getpcpu((KINFO *)b) - getpcpu((KINFO *)a));
432	if (sortby == SORTMEM)
433		return (VSIZE((KINFO *)b) - VSIZE((KINFO *)a));
434	i =  KI_EPROC((KINFO *)a)->e_tdev - KI_EPROC((KINFO *)b)->e_tdev;
435	if (i == 0)
436		i = KI_PROC((KINFO *)a)->p_pid - KI_PROC((KINFO *)b)->p_pid;
437	return (i);
438}
439
440/*
441 * ICK (all for getopt), would rather hide the ugliness
442 * here than taint the main code.
443 *
444 *  ps foo -> ps -foo
445 *  ps 34 -> ps -p34
446 *
447 * The old convention that 't' with no trailing tty arg means the users
448 * tty, is only supported if argv[1] doesn't begin with a '-'.  This same
449 * feature is available with the option 'T', which takes no argument.
450 */
451static char *
452kludge_oldps_options(s)
453	char *s;
454{
455	size_t len;
456	char *newopts, *ns, *cp;
457
458	len = strlen(s);
459	if ((newopts = ns = malloc(len + 2)) == NULL)
460		err(1, NULL);
461	/*
462	 * options begin with '-'
463	 */
464	if (*s != '-')
465		*ns++ = '-';	/* add option flag */
466	/*
467	 * gaze to end of argv[1]
468	 */
469	cp = s + len - 1;
470	/*
471	 * if last letter is a 't' flag with no argument (in the context
472	 * of the oldps options -- option string NOT starting with a '-' --
473	 * then convert to 'T' (meaning *this* terminal, i.e. ttyname(0)).
474	 */
475	if (*cp == 't' && *s != '-')
476		*cp = 'T';
477	else {
478		/*
479		 * otherwise check for trailing number, which *may* be a
480		 * pid.
481		 */
482		while (cp >= s && isdigit(*cp))
483			--cp;
484	}
485	cp++;
486	memmove(ns, s, (size_t)(cp - s));	/* copy up to trailing number */
487	ns += cp - s;
488	/*
489	 * if there's a trailing number, and not a preceding 'p' (pid) or
490	 * 't' (tty) flag, then assume it's a pid and insert a 'p' flag.
491	 */
492	if (isdigit(*cp) &&
493	    (cp == s || (cp[-1] != 't' && cp[-1] != 'p')) &&
494	    (cp - 1 == s || cp[-2] != 't'))
495		*ns++ = 'p';
496	(void)strcpy(ns, cp);		/* and append the number */
497
498	return (newopts);
499}
500
501static void
502usage()
503{
504
505	(void)fprintf(stderr,
506	    "usage:\t%s\n\t   %s\n\t%s\n",
507	    "ps [-aChjlmrSTuvwx] [-O|o fmt] [-p pid] [-t tty]",
508	    "[-M core] [-N system] [-W swap]",
509	    "ps [-L]");
510	exit(1);
511}
512