From 35876eaab991efc7759802f184cdd54663ea8a94 Mon Sep 17 00:00:00 2001
From: Nicholas Marriott <nicm@openbsd.org>
Date: Mon, 1 Jun 2009 22:58:49 +0000
Subject: Import tmux, a terminal multiplexor allowing (among other things) a
 single terminal to be switched between several different windows and programs
 displayed on one terminal be detached from one terminal and moved to another.

ok deraadt pirofti
---
 procname.c | 130 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 130 insertions(+)
 create mode 100644 procname.c

(limited to 'procname.c')

diff --git a/procname.c b/procname.c
new file mode 100644
index 00000000..262d63a4
--- /dev/null
+++ b/procname.c
@@ -0,0 +1,130 @@
+/* $OpenBSD$ */
+
+/*
+ * 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>
+
+#define nitems(_a) (sizeof((_a)) / sizeof((_a)[0]))
+
+#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)
+
+char	*get_proc_name(int, char *);
+
+char *
+get_proc_name(int fd, char *tty)
+{
+	int		 mib[4] = { CTL_KERN, KERN_PROC, KERN_PROC_PGRP, 0 };
+	struct stat	 sb;
+	size_t		 len;
+	struct kinfo_proc *buf, *newbuf;
+	struct proc	*p, *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) {
+		free(buf);
+		return (NULL);
+	}
+	buf = newbuf;
+
+	if (sysctl(mib, nitems(mib), buf, &len, NULL, 0) == -1) {
+		if (errno == ENOMEM)
+			goto retry;
+		free(buf);
+		return (NULL);
+	}
+
+	bestp = NULL;
+	for (i = 0; i < len / sizeof (struct kinfo_proc); i++) {
+		if (buf[i].kp_eproc.e_tdev != sb.st_rdev)
+			continue;
+		p = &buf[i].kp_proc;
+		if (bestp == NULL) {
+			bestp = p;
+			continue;
+		}
+
+		if (is_runnable(p) && !is_runnable(bestp))
+			bestp = p;
+		else if (!is_runnable(p) && is_runnable(bestp))
+			continue;
+
+		if (!is_stopped(p) && is_stopped(bestp))
+			bestp = p;
+		else if (is_stopped(p) && !is_stopped(bestp))
+			continue;
+
+		if (p->p_estcpu > bestp->p_estcpu)
+			bestp = p;
+		else if (p->p_estcpu < bestp->p_estcpu)
+			continue;
+
+		if (p->p_slptime < bestp->p_slptime)
+			bestp = p;
+		else if (p->p_slptime > bestp->p_slptime)
+			continue;
+
+		if (p->p_flag & P_SINTR && !(bestp->p_flag & P_SINTR))
+			bestp = p;
+		else if (!(p->p_flag & P_SINTR) && bestp->p_flag & P_SINTR)
+			continue;
+
+		if (LIST_FIRST(&p->p_children) == NULL &&
+		    LIST_FIRST(&bestp->p_children) != NULL) /* XXX ugh */
+			bestp = p;
+		else if (LIST_FIRST(&p->p_children) != NULL &&
+		    LIST_FIRST(&bestp->p_children) == NULL)
+			continue;
+
+		if (strcmp(p->p_comm, p->p_comm) < 0)
+			bestp = p;
+		else if (strcmp(p->p_comm, p->p_comm) > 0)
+			continue;
+
+		if (p->p_pid > bestp->p_pid)
+			bestp = p;
+	}
+
+	name = NULL;
+	if (bestp != NULL)
+		name = strdup(bestp->p_comm);
+
+	free(buf);
+	return (name);
+}
-- 
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