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Change the way the working directory for new processes is discovered. If
default-path isn't empty, it is used. Otherwise:

1) If tmux neww is run from the command line, the working directory of the
   client is used.

2) Otherwise sysctl KERN_PROC_CWD is used to retrieve the current
   working directory of the process in the active pane.

3) If that fails, the directory where the session was created is used.

Support code by Romain Francois, OpenBSD specific bits by me.

Note this requires a recent userland and kernel with KERN_PROC_CWD.

/* $OpenBSD: procname.c,v 1.8 2011/12/09 16:28:18 nicm 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>
#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 == SZOMB || (p)->p_stat == SDEAD)

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

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)
		return (NULL);
	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);
}

char*
get_proc_cwd(pid_t pid)
{
	int		name[] = { CTL_KERN, KERN_PROC_CWD, (int)pid };
	static char	path[MAXPATHLEN];
	size_t		pathlen = sizeof path;

	if (sysctl(name, 3, path, &pathlen, NULL, 0) != 0)
		return (NULL);
	return (path);
}