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Replace <sys/param.h> with <limits.h> and other less dirty headers where
possible.  Annotate <sys/param.h> lines with their current reasons.  Switch
to PATH_MAX, NGROUPS_MAX, HOST_NAME_MAX+1, LOGIN_NAME_MAX, etc.  Change
MIN() and MAX() to local definitions of MINIMUM() and MAXIMUM() where
sensible to avoid pulling in the pollution.  These are the files confirmed
through binary verification.
ok guenther, millert, doug (helped with the verification protocol)

/* $OpenBSD: procname.c,v 1.14 2015/01/16 06:40:13 deraadt Exp $ */

/*
 * Copyright (c) 2009 Nicholas Marriott <nicm@users.sourceforge.net>
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER
 * IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
 * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

#include <sys/param.h>	/* MAXCOMLEN */
#include <sys/types.h>
#include <sys/proc.h>
#include <sys/sysctl.h>
#include <sys/stat.h>

#include <errno.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#ifndef nitems
#define nitems(_a) (sizeof((_a)) / sizeof((_a)[0]))
#endif

#define is_runnable(p) \
	((p)->p_stat == SRUN || (p)->p_stat == SIDL || (p)->p_stat == SONPROC)
#define is_stopped(p) \
	((p)->p_stat == SSTOP || (p)->p_stat == SDEAD)

struct kinfo_proc	*cmp_procs(struct kinfo_proc *, struct kinfo_proc *);
char			*get_proc_name(int, char *);

struct kinfo_proc *
cmp_procs(struct kinfo_proc *p1, struct kinfo_proc *p2)
{
	if (is_runnable(p1) && !is_runnable(p2))
		return (p1);
	if (!is_runnable(p1) && is_runnable(p2))
		return (p2);

	if (is_stopped(p1) && !is_stopped(p2))
		return (p1);
	if (!is_stopped(p1) && is_stopped(p2))
		return (p2);

	if (p1->p_estcpu > p2->p_estcpu)
		return (p1);
	if (p1->p_estcpu < p2->p_estcpu)
		return (p2);

	if (p1->p_slptime < p2->p_slptime)
		return (p1);
	if (p1->p_slptime > p2->p_slptime)
		return (p2);

	if ((p1->p_flag & P_SINTR) && !(p2->p_flag & P_SINTR))
		return (p1);
	if (!(p1->p_flag & P_SINTR) && (p2->p_flag & P_SINTR))
		return (p2);

	if (strcmp(p1->p_comm, p2->p_comm) < 0)
		return (p1);
	if (strcmp(p1->p_comm, p2->p_comm) > 0)
		return (p2);

	if (p1->p_pid > p2->p_pid)
		return (p1);
	return (p2);
}

char *
get_proc_name(int fd, char *tty)
{
	int		 mib[6] = { CTL_KERN, KERN_PROC, KERN_PROC_PGRP, 0,
				    sizeof(struct kinfo_proc), 0 };
	struct stat	 sb;
	size_t		 len;
	struct kinfo_proc *buf, *newbuf, *bestp;
	u_int		 i;
	char		*name;

	buf = NULL;

	if (stat(tty, &sb) == -1)
		return (NULL);
	if ((mib[3] = tcgetpgrp(fd)) == -1)
		return (NULL);

retry:
	if (sysctl(mib, nitems(mib), NULL, &len, NULL, 0) == -1)
		goto error;
	len = (len * 5) / 4;

	if ((newbuf = realloc(buf, len)) == NULL)
		goto error;
	buf = newbuf;

	mib[5] = (int)(len / sizeof(struct kinfo_proc));
	if (sysctl(mib, nitems(mib), buf, &len, NULL, 0) == -1) {
		if (errno == ENOMEM)
			goto retry;
		goto error;
	}

	bestp = NULL;
	for (i = 0; i < len / sizeof (struct kinfo_proc); i++) {
		if ((dev_t)buf[i].p_tdev != sb.st_rdev)
			continue;
		if (bestp == NULL)
			bestp = &buf[i];
		else
			bestp = cmp_procs(&buf[i], bestp);
	}

	name = NULL;
	if (bestp != NULL)
		name = strdup(bestp->p_comm);

	free(buf);
	return (name);

error:
	free(buf);
	return (NULL);
}