machine.c revision 1.99 
1/* $OpenBSD: machine.c,v 1.99 2019/10/06 15:08:54 kn Exp $	 */
2
3/*-
4 * Copyright (c) 1994 Thorsten Lockert <tholo@sigmasoft.com>
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 * 3. The name of the author may not be used to endorse or promote products
16 *    derived from this software without specific prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
19 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
20 * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL
21 * THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
22 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
23 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
24 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
25 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
26 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
27 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28 *
29 * AUTHOR:  Thorsten Lockert <tholo@sigmasoft.com>
30 *          Adapted from BSD4.4 by Christos Zoulas <christos@ee.cornell.edu>
31 *          Patch for process wait display by Jarl F. Greipsland <jarle@idt.unit.no>
32 *	    Patch for -DORDER by Kenneth Stailey <kstailey@disclosure.com>
33 *	    Patch for new swapctl(2) by Tobias Weingartner <weingart@openbsd.org>
34 */
35
36#include <sys/param.h>	/* DEV_BSIZE MAXCOMLEN PZERO */
37#include <sys/types.h>
38#include <sys/signal.h>
39#include <sys/mount.h>
40#include <sys/proc.h>
41#include <sys/sched.h>
42#include <sys/swap.h>
43#include <sys/sysctl.h>
44
45#include <stdio.h>
46#include <stdlib.h>
47#include <string.h>
48#include <unistd.h>
49#include <err.h>
50#include <errno.h>
51
52#include "top.h"
53#include "display.h"
54#include "machine.h"
55#include "utils.h"
56
57static int	swapmode(int *, int *);
58static char	*state_abbr(struct kinfo_proc *);
59static char	*format_comm(struct kinfo_proc *);
60static int	cmd_matches(struct kinfo_proc *, char *);
61static char	**get_proc_args(struct kinfo_proc *);
62
63/* get_process_info passes back a handle.  This is what it looks like: */
64
65struct handle {
66	struct kinfo_proc **next_proc;	/* points to next valid proc pointer */
67	int		remaining;	/* number of pointers remaining */
68};
69
70/* what we consider to be process size: */
71#define PROCSIZE(pp) ((pp)->p_vm_tsize + (pp)->p_vm_dsize + (pp)->p_vm_ssize)
72
73/*
74 *  These definitions control the format of the per-process area
75 */
76static char header[] =
77	"  PID X        PRI NICE  SIZE   RES STATE     WAIT      TIME    CPU COMMAND";
78
79/* 0123456   -- field to fill in starts at header+6 */
80#define UNAME_START 6
81
82#define Proc_format \
83	"%5d %-8.8s %3d %4d %5s %5s %-9s %-7.7s %6s %5.2f%% %s"
84
85/* process state names for the "STATE" column of the display */
86/*
87 * the extra nulls in the string "run" are for adding a slash and the
88 * processor number when needed
89 */
90
91char	*state_abbrev[] = {
92	"", "start", "run", "sleep", "stop", "zomb", "dead", "onproc"
93};
94
95/* these are for calculating cpu state percentages */
96static struct cpustats	*cp_time;
97static struct cpustats	*cp_old;
98static struct cpustats	*cp_diff;
99
100/* these are for detailing the process states */
101int process_states[8];
102char *procstatenames[] = {
103	"", " starting, ", " running, ", " idle, ",
104	" stopped, ", " zombie, ", " dead, ", " on processor, ",
105	NULL
106};
107
108/* these are for detailing the cpu states */
109int64_t *cpu_states;
110char *cpustatenames[] = {
111	"user", "nice", "sys", "spin", "intr", "idle", NULL
112};
113
114/* this is for tracking which cpus are online */
115int *cpu_online;
116
117/* these are for detailing the memory statistics */
118int memory_stats[10];
119char *memorynames[] = {
120	"Real: ", "K/", "K act/tot ", "Free: ", "K ",
121	"Cache: ", "K ",
122	"Swap: ", "K/", "K",
123	NULL
124};
125
126/* these are names given to allowed sorting orders -- first is default */
127char	*ordernames[] = {
128	"cpu", "size", "res", "time", "pri", "pid", "command", NULL
129};
130
131/* these are for keeping track of the proc array */
132static int	nproc;
133static int	onproc = -1;
134static int	pref_len;
135static struct kinfo_proc *pbase;
136static struct kinfo_proc **pref;
137
138/* these are for getting the memory statistics */
139static int	pageshift;	/* log base 2 of the pagesize */
140
141/* define pagetok in terms of pageshift */
142#define pagetok(size) ((size) << pageshift)
143
144int		ncpu;
145int		ncpuonline;
146int		fscale;
147
148unsigned int	maxslp;
149
150int
151getfscale(void)
152{
153	int mib[] = { CTL_KERN, KERN_FSCALE };
154	size_t size = sizeof(fscale);
155
156	if (sysctl(mib, sizeof(mib) / sizeof(mib[0]),
157	    &fscale, &size, NULL, 0) == -1)
158		return (-1);
159	return fscale;
160}
161
162int
163getncpu(void)
164{
165	int mib[] = { CTL_HW, HW_NCPU };
166	int numcpu;
167	size_t size = sizeof(numcpu);
168
169	if (sysctl(mib, sizeof(mib) / sizeof(mib[0]),
170	    &numcpu, &size, NULL, 0) == -1)
171		return (-1);
172
173	return (numcpu);
174}
175
176int
177getncpuonline(void)
178{
179	int mib[] = { CTL_HW, HW_NCPUONLINE };
180	int numcpu;
181	size_t size = sizeof(numcpu);
182
183	if (sysctl(mib, sizeof(mib) / sizeof(mib[0]),
184	    &numcpu, &size, NULL, 0) == -1)
185		return (-1);
186
187	return (numcpu);
188}
189
190int
191machine_init(struct statics *statics)
192{
193	int pagesize;
194
195	ncpu = getncpu();
196	if (ncpu == -1)
197		return (-1);
198	if (getfscale() == -1)
199		return (-1);
200	cpu_states = calloc(ncpu, CPUSTATES * sizeof(int64_t));
201	if (cpu_states == NULL)
202		err(1, NULL);
203	cp_time = calloc(ncpu, sizeof(*cp_time));
204	cp_old  = calloc(ncpu, sizeof(*cp_old));
205	cp_diff = calloc(ncpu, sizeof(*cp_diff));
206	if (cp_time == NULL || cp_old == NULL || cp_diff == NULL)
207		err(1, NULL);
208	cpu_online = calloc(ncpu, sizeof(*cpu_online));
209	if (cpu_online == NULL)
210		err(1, NULL);
211
212	pbase = NULL;
213	pref = NULL;
214	onproc = -1;
215	nproc = 0;
216
217	/*
218	 * get the page size with "getpagesize" and calculate pageshift from
219	 * it
220	 */
221	pagesize = getpagesize();
222	pageshift = 0;
223	while (pagesize > 1) {
224		pageshift++;
225		pagesize >>= 1;
226	}
227
228	/* we only need the amount of log(2)1024 for our conversion */
229	pageshift -= LOG1024;
230
231	/* fill in the statics information */
232	statics->procstate_names = procstatenames;
233	statics->cpustate_names = cpustatenames;
234	statics->memory_names = memorynames;
235	statics->order_names = ordernames;
236	return (0);
237}
238
239char *
240format_header(char *second_field, int show_threads)
241{
242	char *field_name, *thread_field = "     TID";
243	char *ptr;
244
245	if (show_threads)
246		field_name = thread_field;
247	else
248		field_name = second_field;
249
250	ptr = header + UNAME_START;
251	while (*field_name != '\0')
252		*ptr++ = *field_name++;
253	return (header);
254}
255
256void
257get_system_info(struct system_info *si)
258{
259	static int cpustats_mib[] = {CTL_KERN, KERN_CPUSTATS, /*fillme*/0};
260	static int sysload_mib[] = {CTL_VM, VM_LOADAVG};
261	static int uvmexp_mib[] = {CTL_VM, VM_UVMEXP};
262	static int bcstats_mib[] = {CTL_VFS, VFS_GENERIC, VFS_BCACHESTAT};
263	struct loadavg sysload;
264	struct uvmexp uvmexp;
265	struct bcachestats bcstats;
266	double *infoloadp;
267	size_t size;
268	int i;
269	int64_t *tmpstate;
270
271	size = sizeof(*cp_time);
272	for (i = 0; i < ncpu; i++) {
273		cpustats_mib[2] = i;
274		tmpstate = cpu_states + (CPUSTATES * i);
275		if (sysctl(cpustats_mib, 3, &cp_time[i], &size, NULL, 0) == -1)
276			warn("sysctl kern.cpustats failed");
277		/* convert cpustats counts to percentages */
278		(void) percentages(CPUSTATES, tmpstate, cp_time[i].cs_time,
279		    cp_old[i].cs_time, cp_diff[i].cs_time);
280		/* note whether the cpu is online */
281		cpu_online[i] = (cp_time[i].cs_flags & CPUSTATS_ONLINE) != 0;
282	}
283
284	size = sizeof(sysload);
285	if (sysctl(sysload_mib, 2, &sysload, &size, NULL, 0) == -1)
286		warn("sysctl failed");
287	infoloadp = si->load_avg;
288	for (i = 0; i < 3; i++)
289		*infoloadp++ = ((double) sysload.ldavg[i]) / sysload.fscale;
290
291
292	/* get total -- systemwide main memory usage structure */
293	size = sizeof(uvmexp);
294	if (sysctl(uvmexp_mib, 2, &uvmexp, &size, NULL, 0) == -1) {
295		warn("sysctl failed");
296		bzero(&uvmexp, sizeof(uvmexp));
297	}
298	size = sizeof(bcstats);
299	if (sysctl(bcstats_mib, 3, &bcstats, &size, NULL, 0) == -1) {
300		warn("sysctl failed");
301		bzero(&bcstats, sizeof(bcstats));
302	}
303	/* convert memory stats to Kbytes */
304	memory_stats[0] = -1;
305	memory_stats[1] = pagetok(uvmexp.active);
306	memory_stats[2] = pagetok(uvmexp.npages - uvmexp.free);
307	memory_stats[3] = -1;
308	memory_stats[4] = pagetok(uvmexp.free);
309	memory_stats[5] = -1;
310	memory_stats[6] = pagetok(bcstats.numbufpages);
311	memory_stats[7] = -1;
312
313	if (!swapmode(&memory_stats[8], &memory_stats[9])) {
314		memory_stats[8] = 0;
315		memory_stats[9] = 0;
316	}
317
318	/* set arrays and strings */
319	si->cpustates = cpu_states;
320	si->cpuonline = cpu_online;
321	si->memory = memory_stats;
322	si->last_pid = -1;
323}
324
325static struct handle handle;
326
327struct kinfo_proc *
328getprocs(int op, int arg, int *cnt)
329{
330	size_t size;
331	int mib[6] = {CTL_KERN, KERN_PROC, 0, 0, sizeof(struct kinfo_proc), 0};
332	static int maxslp_mib[] = {CTL_VM, VM_MAXSLP};
333	static struct kinfo_proc *procbase;
334	int st;
335
336	mib[2] = op;
337	mib[3] = arg;
338
339	size = sizeof(maxslp);
340	if (sysctl(maxslp_mib, 2, &maxslp, &size, NULL, 0) == -1) {
341		warn("sysctl vm.maxslp failed");
342		return (0);
343	}
344    retry:
345	free(procbase);
346	st = sysctl(mib, 6, NULL, &size, NULL, 0);
347	if (st == -1) {
348		/* _kvm_syserr(kd, kd->program, "kvm_getprocs"); */
349		return (0);
350	}
351	size = 5 * size / 4;			/* extra slop */
352	if ((procbase = malloc(size)) == NULL)
353		return (0);
354	mib[5] = (int)(size / sizeof(struct kinfo_proc));
355	st = sysctl(mib, 6, procbase, &size, NULL, 0);
356	if (st == -1) {
357		if (errno == ENOMEM)
358			goto retry;
359		/* _kvm_syserr(kd, kd->program, "kvm_getprocs"); */
360		return (0);
361	}
362	*cnt = (int)(size / sizeof(struct kinfo_proc));
363	return (procbase);
364}
365
366static char **
367get_proc_args(struct kinfo_proc *kp)
368{
369	static char	**s;
370	static size_t	siz = 1023;
371	int		mib[4];
372
373	if (!s && !(s = malloc(siz)))
374		err(1, NULL);
375
376	mib[0] = CTL_KERN;
377	mib[1] = KERN_PROC_ARGS;
378	mib[2] = kp->p_pid;
379	mib[3] = KERN_PROC_ARGV;
380	for (;;) {
381		size_t space = siz;
382		if (sysctl(mib, 4, s, &space, NULL, 0) == 0)
383			break;
384		if (errno != ENOMEM)
385			return NULL;
386		siz *= 2;
387		if ((s = realloc(s, siz)) == NULL)
388			err(1, NULL);
389	}
390	return s;
391}
392
393static int
394cmd_matches(struct kinfo_proc *proc, char *term)
395{
396	extern int	show_args;
397	char		**args = NULL;
398
399	if (!term) {
400		/* No command filter set */
401		return 1;
402	} else {
403		/* Filter set, process name needs to contain term */
404		if (strstr(proc->p_comm, term))
405			return 1;
406		/* If showing arguments, search those as well */
407		if (show_args) {
408			args = get_proc_args(proc);
409
410			if (args == NULL) {
411				/* Failed to get args, so can't search them */
412				return 0;
413			}
414
415			while (*args != NULL) {
416				if (strstr(*args, term))
417					return 1;
418				args++;
419			}
420		}
421	}
422	return 0;
423}
424
425struct handle *
426get_process_info(struct system_info *si, struct process_select *sel,
427    int (*compare) (const void *, const void *))
428{
429	int show_idle, show_system, show_threads, show_uid, show_pid, show_cmd;
430	int hide_uid;
431	int total_procs, active_procs;
432	struct kinfo_proc **prefp, *pp;
433	int what = KERN_PROC_KTHREAD;
434
435	if (sel->threads)
436		what |= KERN_PROC_SHOW_THREADS;
437
438	if ((pbase = getprocs(what, 0, &nproc)) == NULL) {
439		/* warnx("%s", kvm_geterr(kd)); */
440		quit(23);
441	}
442	if (nproc > onproc)
443		pref = reallocarray(pref, (onproc = nproc),
444		    sizeof(struct kinfo_proc *));
445	if (pref == NULL) {
446		warnx("Out of memory.");
447		quit(23);
448	}
449	/* get a pointer to the states summary array */
450	si->procstates = process_states;
451
452	/* set up flags which define what we are going to select */
453	show_idle = sel->idle;
454	show_system = sel->system;
455	show_threads = sel->threads;
456	show_uid = sel->uid != (uid_t)-1;
457	hide_uid = sel->huid != (uid_t)-1;
458	show_pid = sel->pid != (pid_t)-1;
459	show_cmd = sel->command != NULL;
460
461	/* count up process states and get pointers to interesting procs */
462	total_procs = 0;
463	active_procs = 0;
464	memset((char *) process_states, 0, sizeof(process_states));
465	prefp = pref;
466	for (pp = pbase; pp < &pbase[nproc]; pp++) {
467		/*
468		 *  Place pointers to each valid proc structure in pref[].
469		 *  Process slots that are actually in use have a non-zero
470		 *  status field.  Processes with P_SYSTEM set are system
471		 *  processes---these get ignored unless show_system is set.
472		 */
473		if (show_threads && pp->p_tid == -1)
474			continue;
475		if (pp->p_stat != 0 &&
476		    (show_system || (pp->p_flag & P_SYSTEM) == 0) &&
477		    (show_threads || (pp->p_flag & P_THREAD) == 0)) {
478			total_procs++;
479			process_states[(unsigned char) pp->p_stat]++;
480			if ((pp->p_psflags & PS_ZOMBIE) == 0 &&
481			    (show_idle || pp->p_pctcpu != 0 ||
482			    pp->p_stat == SRUN) &&
483			    (!hide_uid || pp->p_ruid != sel->huid) &&
484			    (!show_uid || pp->p_ruid == sel->uid) &&
485			    (!show_pid || pp->p_pid == sel->pid) &&
486			    (!show_cmd || cmd_matches(pp, sel->command))) {
487				*prefp++ = pp;
488				active_procs++;
489			}
490		}
491	}
492
493	/* if requested, sort the "interesting" processes */
494	if (compare != NULL)
495		qsort((char *) pref, active_procs,
496		    sizeof(struct kinfo_proc *), compare);
497	/* remember active and total counts */
498	si->p_total = total_procs;
499	si->p_active = pref_len = active_procs;
500
501	/* pass back a handle */
502	handle.next_proc = pref;
503	handle.remaining = active_procs;
504	return &handle;
505}
506
507char fmt[MAX_COLS];	/* static area where result is built */
508
509static char *
510state_abbr(struct kinfo_proc *pp)
511{
512	static char buf[10];
513
514	if (ncpu > 1 && pp->p_cpuid != KI_NOCPU)
515		snprintf(buf, sizeof buf, "%s/%llu",
516		    state_abbrev[(unsigned char)pp->p_stat], pp->p_cpuid);
517	else
518		snprintf(buf, sizeof buf, "%s",
519		    state_abbrev[(unsigned char)pp->p_stat]);
520	return buf;
521}
522
523static char *
524format_comm(struct kinfo_proc *kp)
525{
526	static char	buf[MAX_COLS];
527	char		**p, **s;
528	extern int	show_args;
529
530	if (!show_args)
531		return (kp->p_comm);
532
533	s = get_proc_args(kp);
534	if (s == NULL)
535		return kp->p_comm;
536
537	buf[0] = '\0';
538	for (p = s; *p != NULL; p++) {
539		if (p != s)
540			strlcat(buf, " ", sizeof(buf));
541		strlcat(buf, *p, sizeof(buf));
542	}
543	if (buf[0] == '\0')
544		return (kp->p_comm);
545	return (buf);
546}
547
548char *
549format_next_process(struct handle *hndl, const char *(*get_userid)(uid_t, int),
550    pid_t *pid, int show_threads)
551{
552	char *p_wait;
553	struct kinfo_proc *pp;
554	int cputime;
555	double pct;
556	char buf[16];
557
558	/* find and remember the next proc structure */
559	pp = *(hndl->next_proc++);
560	hndl->remaining--;
561
562	cputime = pp->p_rtime_sec + ((pp->p_rtime_usec + 500000) / 1000000);
563
564	/* calculate the base for cpu percentages */
565	pct = (double)pp->p_pctcpu / fscale;
566
567	if (pp->p_wmesg[0])
568		p_wait = pp->p_wmesg;
569	else
570		p_wait = "-";
571
572	if (show_threads)
573		snprintf(buf, sizeof(buf), "%8d", pp->p_tid);
574	else
575		snprintf(buf, sizeof(buf), "%s", (*get_userid)(pp->p_ruid, 0));
576
577	/* format this entry */
578	snprintf(fmt, sizeof(fmt), Proc_format, pp->p_pid, buf,
579	    pp->p_priority - PZERO, pp->p_nice - NZERO,
580	    format_k(pagetok(PROCSIZE(pp))),
581	    format_k(pagetok(pp->p_vm_rssize)),
582	    (pp->p_stat == SSLEEP && pp->p_slptime > maxslp) ?
583	    "idle" : state_abbr(pp),
584	    p_wait, format_time(cputime), 100.0 * pct,
585	    printable(format_comm(pp)));
586
587	*pid = pp->p_pid;
588	/* return the result */
589	return (fmt);
590}
591
592/* comparison routine for qsort */
593static unsigned char sorted_state[] =
594{
595	0,			/* not used		 */
596	4,			/* start		 */
597	5,			/* run			 */
598	2,			/* sleep		 */
599	3,			/* stop			 */
600	1			/* zombie		 */
601};
602
603extern int rev_order;
604
605/*
606 *  proc_compares - comparison functions for "qsort"
607 */
608
609/*
610 * First, the possible comparison keys.  These are defined in such a way
611 * that they can be merely listed in the source code to define the actual
612 * desired ordering.
613 */
614
615#define ORDERKEY_PCTCPU \
616	if ((result = (int)(p2->p_pctcpu - p1->p_pctcpu)) == 0)
617#define ORDERKEY_CPUTIME \
618	if ((result = p2->p_rtime_sec - p1->p_rtime_sec) == 0) \
619		if ((result = p2->p_rtime_usec - p1->p_rtime_usec) == 0)
620#define ORDERKEY_STATE \
621	if ((result = sorted_state[(unsigned char)p2->p_stat] - \
622	    sorted_state[(unsigned char)p1->p_stat])  == 0)
623#define ORDERKEY_PRIO \
624	if ((result = p2->p_priority - p1->p_priority) == 0)
625#define ORDERKEY_RSSIZE \
626	if ((result = p2->p_vm_rssize - p1->p_vm_rssize) == 0)
627#define ORDERKEY_MEM \
628	if ((result = PROCSIZE(p2) - PROCSIZE(p1)) == 0)
629#define ORDERKEY_PID \
630	if ((result = p1->p_pid - p2->p_pid) == 0)
631#define ORDERKEY_CMD \
632	if ((result = strcmp(p1->p_comm, p2->p_comm)) == 0)
633
634/* remove one level of indirection and set sort order */
635#define SETORDER do { \
636		if (rev_order) { \
637			p1 = *(struct kinfo_proc **) v2; \
638			p2 = *(struct kinfo_proc **) v1; \
639		} else { \
640			p1 = *(struct kinfo_proc **) v1; \
641			p2 = *(struct kinfo_proc **) v2; \
642		} \
643	} while (0)
644
645/* compare_cpu - the comparison function for sorting by cpu percentage */
646static int
647compare_cpu(const void *v1, const void *v2)
648{
649	struct kinfo_proc *p1, *p2;
650	int result;
651
652	SETORDER;
653
654	ORDERKEY_PCTCPU
655	ORDERKEY_CPUTIME
656	ORDERKEY_STATE
657	ORDERKEY_PRIO
658	ORDERKEY_RSSIZE
659	ORDERKEY_MEM
660		;
661	return (result);
662}
663
664/* compare_size - the comparison function for sorting by total memory usage */
665static int
666compare_size(const void *v1, const void *v2)
667{
668	struct kinfo_proc *p1, *p2;
669	int result;
670
671	SETORDER;
672
673	ORDERKEY_MEM
674	ORDERKEY_RSSIZE
675	ORDERKEY_PCTCPU
676	ORDERKEY_CPUTIME
677	ORDERKEY_STATE
678	ORDERKEY_PRIO
679		;
680	return (result);
681}
682
683/* compare_res - the comparison function for sorting by resident set size */
684static int
685compare_res(const void *v1, const void *v2)
686{
687	struct kinfo_proc *p1, *p2;
688	int result;
689
690	SETORDER;
691
692	ORDERKEY_RSSIZE
693	ORDERKEY_MEM
694	ORDERKEY_PCTCPU
695	ORDERKEY_CPUTIME
696	ORDERKEY_STATE
697	ORDERKEY_PRIO
698		;
699	return (result);
700}
701
702/* compare_time - the comparison function for sorting by CPU time */
703static int
704compare_time(const void *v1, const void *v2)
705{
706	struct kinfo_proc *p1, *p2;
707	int result;
708
709	SETORDER;
710
711	ORDERKEY_CPUTIME
712	ORDERKEY_PCTCPU
713	ORDERKEY_STATE
714	ORDERKEY_PRIO
715	ORDERKEY_MEM
716	ORDERKEY_RSSIZE
717		;
718	return (result);
719}
720
721/* compare_prio - the comparison function for sorting by CPU time */
722static int
723compare_prio(const void *v1, const void *v2)
724{
725	struct kinfo_proc *p1, *p2;
726	int result;
727
728	SETORDER;
729
730	ORDERKEY_PRIO
731	ORDERKEY_PCTCPU
732	ORDERKEY_CPUTIME
733	ORDERKEY_STATE
734	ORDERKEY_RSSIZE
735	ORDERKEY_MEM
736		;
737	return (result);
738}
739
740static int
741compare_pid(const void *v1, const void *v2)
742{
743	struct kinfo_proc *p1, *p2;
744	int result;
745
746	SETORDER;
747
748	ORDERKEY_PID
749	ORDERKEY_PCTCPU
750	ORDERKEY_CPUTIME
751	ORDERKEY_STATE
752	ORDERKEY_PRIO
753	ORDERKEY_RSSIZE
754	ORDERKEY_MEM
755		;
756	return (result);
757}
758
759static int
760compare_cmd(const void *v1, const void *v2)
761{
762	struct kinfo_proc *p1, *p2;
763	int result;
764
765	SETORDER;
766
767	ORDERKEY_CMD
768	ORDERKEY_PCTCPU
769	ORDERKEY_CPUTIME
770	ORDERKEY_STATE
771	ORDERKEY_PRIO
772	ORDERKEY_RSSIZE
773	ORDERKEY_MEM
774		;
775	return (result);
776}
777
778
779int (*proc_compares[])(const void *, const void *) = {
780	compare_cpu,
781	compare_size,
782	compare_res,
783	compare_time,
784	compare_prio,
785	compare_pid,
786	compare_cmd,
787	NULL
788};
789
790/*
791 * proc_owner(pid) - returns the uid that owns process "pid", or -1 if
792 *		the process does not exist.
793 *		It is EXTREMELY IMPORTANT that this function work correctly.
794 *		If top runs setuid root (as in SVR4), then this function
795 *		is the only thing that stands in the way of a serious
796 *		security problem.  It validates requests for the "kill"
797 *		and "renice" commands.
798 */
799uid_t
800proc_owner(pid_t pid)
801{
802	struct kinfo_proc **prefp, *pp;
803	int cnt;
804
805	prefp = pref;
806	cnt = pref_len;
807	while (--cnt >= 0) {
808		pp = *prefp++;
809		if (pp->p_pid == pid)
810			return ((uid_t)pp->p_ruid);
811	}
812	return (uid_t)(-1);
813}
814
815/*
816 * swapmode is rewritten by Tobias Weingartner <weingart@openbsd.org>
817 * to be based on the new swapctl(2) system call.
818 */
819static int
820swapmode(int *used, int *total)
821{
822	struct swapent *swdev;
823	int nswap, rnswap, i;
824
825	nswap = swapctl(SWAP_NSWAP, 0, 0);
826	if (nswap == 0)
827		return 0;
828
829	swdev = calloc(nswap, sizeof(*swdev));
830	if (swdev == NULL)
831		return 0;
832
833	rnswap = swapctl(SWAP_STATS, swdev, nswap);
834	if (rnswap == -1) {
835		free(swdev);
836		return 0;
837	}
838
839	/* if rnswap != nswap, then what? */
840
841	/* Total things up */
842	*total = *used = 0;
843	for (i = 0; i < nswap; i++) {
844		if (swdev[i].se_flags & SWF_ENABLE) {
845			*used += (swdev[i].se_inuse / (1024 / DEV_BSIZE));
846			*total += (swdev[i].se_nblks / (1024 / DEV_BSIZE));
847		}
848	}
849	free(swdev);
850	return 1;
851}
852