Add the `pkill' and `pgrep' commands from NetBSD. This is the source

straight from NetBSD (except to add the RCS-ID lines for FreeBSD).
These will probably require a few updates before they are added to
the FreeBSD buildworld.  I might MFC these to 4.x-stable after 4.10.

Discussed on:	freebsd-arch
Obtained from:	NetBSD (and OpenBSD also has these)

3 files changed, 752 insertions, 0 deletions

diff --git a/usr.bin/pkill/Makefile b/usr.bin/pkill/Makefile
new file mode 100644
index 0000000..fec4fd8
--- /dev/null
+++ b/usr.bin/pkill/Makefile
@@ -0,0 +1,14 @@
+#	$NetBSD: Makefile,v 1.1 2002/03/01 11:21:58 ad Exp $
+# $FreeBSD$
+
+PROG=	pkill
+SRCS=	pkill.c
+MAN=	pkill.1
+
+LDADD+=	-lkvm
+DPADD+=	${LIBKVM}
+
+LINKS+=	${BINDIR}/pkill ${BINDIR}/pgrep
+MLINKS+=pkill.1 pgrep.1
+
+.include <bsd.prog.mk>
diff --git a/usr.bin/pkill/pkill.1 b/usr.bin/pkill/pkill.1
new file mode 100644
index 0000000..39c507e
--- /dev/null
+++ b/usr.bin/pkill/pkill.1
@@ -0,0 +1,199 @@
+.\"	$NetBSD: pkill.1,v 1.8 2003/02/14 15:59:18 grant Exp $
+.\"
+.\" $FreeBSD$
+.\"
+.\" Copyright (c) 2002 The NetBSD Foundation, Inc.
+.\" All rights reserved.
+.\"
+.\" This code is derived from software contributed to The NetBSD Foundation
+.\" by Andrew Doran.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\" 3. All advertising materials mentioning features or use of this software
+.\"    must display the following acknowledgement:
+.\"        This product includes software developed by the NetBSD
+.\"        Foundation, Inc. and its contributors.
+.\" 4. Neither the name of The NetBSD Foundation nor the names of its
+.\"    contributors may be used to endorse or promote products derived
+.\"    from this software without specific prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
+.\" ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+.\" TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+.\" PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
+.\" BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+.\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+.\" CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+.\" POSSIBILITY OF SUCH DAMAGE.
+.\"
+.Dd March 1, 2002
+.Dt PKILL 1
+.Os
+.Sh NAME
+.Nm pkill
+.Nd find or signal processes by name
+.Sh SYNOPSIS
+.Nm pgrep
+.Op Fl flnvx
+.Op Fl G Ar gid
+.Op Fl P Ar ppid
+.Op Fl U Ar uid
+.Op Fl d Ar delim
+.Op Fl g Ar pgrp
+.Op Fl s Ar sid
+.Op Fl t Ar tty
+.Op Fl u Ar euid
+.Op Ar pattern Op ...
+.Nm pkill
+.Op Fl signal
+.Op Fl fnvx
+.Op Fl G Ar gid
+.Op Fl P Ar ppid
+.Op Fl U Ar uid
+.Op Fl g Ar pgrp
+.Op Fl s Ar sid
+.Op Fl t Ar tty
+.Op Fl u Ar euid
+.Op Ar pattern Op ...
+.Sh DESCRIPTION
+The
+.Nm pgrep
+command searches the process table on the running system and prints the
+process IDs of all processes that match the criteria given on the command
+line.
+.Pp
+The
+.Nm pkill
+command searches the process table on the running system and signals all
+processes that match the criteria given on the command line.
+.Pp
+The following options are available:
+.Bl -tag -width xxxxxxxx
+.It Fl G Ar gid
+Restrict matches to processes with a real group ID in the comma-separated
+list
+.Ar gid .
+.It Fl P Ar ppid
+Restrict matches to processes with a parent process ID in the
+comma-separated list
+.Ar ppid .
+.It Fl U Ar uid
+Restrict matches to processes with a real user ID in the comma-separated
+list
+.Ar uid .
+.It Fl d Ar delim
+Specify a delimiter to be printed between each process ID.
+The default is a newline.
+This option can only be used with the
+.Nm pgrep
+command.
+.It Fl f
+Match against full argument lists.
+The default is to match against process names.
+.It Fl g Ar pgrp
+Restrict matches to processes with a process group ID in the comma-separated
+list
+.Ar pgrp .
+The value zero is taken to mean the process group ID of the running
+.Nm pgrep
+or
+.Nm pkill
+command.
+.It Fl l
+Long output.
+Print the process name in addition to the process ID for each matching
+process.
+If used in conjunction with
+.Fl f ,
+print the process ID and the full argument list for each matching process.
+This option can only be used with the
+.Nm pgrep
+command.
+.It Fl n
+Match only the most recently created process, if any.
+.It Fl s Ar sid
+Restrict matches to processes with a session ID in the comma-separated
+list
+.Ar sid .
+The value zero is taken to mean the session ID of the running
+.Nm pgrep
+or
+.Nm pkill
+command.
+.It Fl t Ar tty
+Restrict matches to processes associated with a terminal in the
+comma-separated list
+.Ar tty .
+Terminal names may be of the form
+.Sq ttyxx
+or the shortened form
+.Sq xx .
+A single dash (`-') matches processes not associated with a terminal.
+.It Fl u Ar euid
+Restrict matches to processes with an effective user ID in the
+comma-separated list
+.Ar euid .
+.It Fl v
+Reverse the sense of the matching; display processes that do not match the
+given criteria.
+.It Fl x
+Require an exact match of the process name, or argument list if
+.Fl f
+is given.
+The default is to match any substring.
+.It Fl signal
+A non-negative decimal number or symbolic signal name specifying the signal
+to be sent instead of the default TERM.
+This option is valid only when given as the first argument to
+.Nm pkill .
+.El
+.Pp
+Note that a running
+.Nm pgrep
+or
+.Nm pkill
+process will never consider itself nor system processes (kernel threads) as
+a potential match.
+.Sh EXIT STATUS
+.Nm pgrep
+and
+.Nm pkill
+return one of the following values upon exit:
+.Bl -tag -width foo
+.It 0
+One or more processes were matched.
+.It 1
+No processes were matched.
+.It 2
+Invalid options were specified on the command line.
+.It 3
+An internal error occurred.
+.El
+.Sh SEE ALSO
+.Xr kill 1 ,
+.Xr ps 1 ,
+.Xr kill 2 ,
+.Xr sigaction 2 ,
+.Xr re_format 7 ,
+.Xr signal 7
+.Sh HISTORY
+.Nm pkill
+and
+.Nm pgrep
+first appeared in
+.Nx 1.6 .
+They are modelled after utilities of the same name that appeared in Sun
+Solaris 7.
+.Sh AUTHORS
+.An Andrew Doran
+.Aq ad@NetBSD.org .
diff --git a/usr.bin/pkill/pkill.c b/usr.bin/pkill/pkill.c
new file mode 100644
index 0000000..dc52eb3
--- /dev/null
+++ b/usr.bin/pkill/pkill.c
@@ -0,0 +1,539 @@
+/*	$NetBSD: pkill.c,v 1.7 2004/02/15 17:03:30 soren Exp $	*/
+
+/*-
+ * Copyright (c) 2002 The NetBSD Foundation, Inc.
+ * All rights reserved.
+ *
+ * This code is derived from software contributed to The NetBSD Foundation
+ * by Andrew Doran.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *	This product includes software developed by the NetBSD
+ *	Foundation, Inc. and its contributors.
+ * 4. Neither the name of The NetBSD Foundation nor the names of its
+ *    contributors may be used to endorse or promote products derived
+ *    from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
+ * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+ * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <sys/types.h>
+#include <sys/param.h>
+#include <sys/sysctl.h>
+#include <sys/proc.h>
+#include <sys/queue.h>
+#include <sys/stat.h>
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <limits.h>
+#include <string.h>
+#include <unistd.h>
+#include <signal.h>
+#include <regex.h>
+#include <ctype.h>
+#include <kvm.h>
+#include <err.h>
+#include <pwd.h>
+#include <grp.h>
+#include <errno.h>
+
+#define	STATUS_MATCH	0
+#define	STATUS_NOMATCH	1
+#define	STATUS_BADUSAGE	2
+#define	STATUS_ERROR	3
+
+enum listtype {
+	LT_GENERIC,
+	LT_USER,
+	LT_GROUP,
+	LT_TTY,
+	LT_PGRP,
+	LT_SID
+};
+
+struct list {
+	SLIST_ENTRY(list) li_chain;
+	long	li_number;
+};
+
+SLIST_HEAD(listhead, list);
+
+struct kinfo_proc2	*plist;
+char	*selected;
+char	*delim = "\n";
+int	nproc;
+int	pgrep;
+int	signum = SIGTERM;
+int	newest;
+int	inverse;
+int	longfmt;
+int	matchargs;
+int	fullmatch;
+kvm_t	*kd;
+pid_t	mypid;
+
+struct listhead euidlist = SLIST_HEAD_INITIALIZER(list);
+struct listhead ruidlist = SLIST_HEAD_INITIALIZER(list);
+struct listhead rgidlist = SLIST_HEAD_INITIALIZER(list);
+struct listhead pgrplist = SLIST_HEAD_INITIALIZER(list);
+struct listhead ppidlist = SLIST_HEAD_INITIALIZER(list);
+struct listhead tdevlist = SLIST_HEAD_INITIALIZER(list);
+struct listhead sidlist = SLIST_HEAD_INITIALIZER(list);
+
+int	main(int, char **);
+void	usage(void);
+void	killact(struct kinfo_proc2 *);
+void	grepact(struct kinfo_proc2 *);
+void	makelist(struct listhead *, enum listtype, char *);
+
+int
+main(int argc, char **argv)
+{
+	extern char *optarg;
+	extern int optind;
+	char buf[_POSIX2_LINE_MAX], *mstr, **pargv, *p, *q;
+	int i, j, ch, bestidx, rv, criteria;
+	void (*action)(struct kinfo_proc2 *);
+	struct kinfo_proc2 *kp;
+	struct list *li;
+	u_int32_t bestsec, bestusec;
+	regex_t reg;
+	regmatch_t regmatch;
+
+	if (strcmp(getprogname(), "pgrep") == 0) {
+		action = grepact;
+		pgrep = 1;
+	} else {
+		action = killact;
+		p = argv[1];
+
+		if (argc > 1 && p[0] == '-') {
+			p++;
+			i = (int)strtol(p, &q, 10);
+			if (*q == '\0') {
+				signum = i;
+				argv++;
+				argc--;
+			} else {
+				if (strncasecmp(p, "sig", 3) == 0)
+					p += 3;
+				for (i = 1; i < NSIG; i++)
+					if (strcasecmp(sys_signame[i], p) == 0)
+						break;
+				if (i != NSIG) {
+					signum = i;
+					argv++;
+					argc--;
+				}
+			}
+		}
+	}
+
+	criteria = 0;
+
+	while ((ch = getopt(argc, argv, "G:P:U:d:fg:lns:t:u:vx")) != -1)
+		switch (ch) {
+		case 'G':
+			makelist(&rgidlist, LT_GROUP, optarg);
+			criteria = 1;
+			break;
+		case 'P':
+			makelist(&ppidlist, LT_GENERIC, optarg);
+			criteria = 1;
+			break;
+		case 'U':
+			makelist(&ruidlist, LT_USER, optarg);
+			criteria = 1;
+			break;
+		case 'd':
+			if (!pgrep)
+				usage();
+			delim = optarg;
+			break;
+		case 'f':
+			matchargs = 1;
+			break;
+		case 'g':
+			makelist(&pgrplist, LT_PGRP, optarg);
+			criteria = 1;
+			break;
+		case 'l':
+			if (!pgrep)
+				usage();
+			longfmt = 1;
+			break;
+		case 'n':
+			newest = 1;
+			criteria = 1;
+			break;
+		case 's':
+			makelist(&sidlist, LT_SID, optarg);
+			criteria = 1;
+			break;
+		case 't':
+			makelist(&tdevlist, LT_TTY, optarg);
+			criteria = 1;
+			break;
+		case 'u':
+			makelist(&euidlist, LT_USER, optarg);
+			criteria = 1;
+			break;
+		case 'v':
+			inverse = 1;
+			break;
+		case 'x':
+			fullmatch = 1;
+			break;
+		default:
+			usage();
+			/* NOTREACHED */
+		}
+
+	argc -= optind;
+	argv += optind;
+	if (argc != 0)
+		criteria = 1;
+	if (!criteria)
+		usage();
+
+	mypid = getpid();
+
+	/*
+	 * Retrieve the list of running processes from the kernel.
+	 */
+	kd = kvm_openfiles(NULL, NULL, NULL, KVM_NO_FILES, buf);
+	if (kd == NULL)
+		errx(STATUS_ERROR, "kvm_openfiles(): %s", buf);
+
+	plist = kvm_getproc2(kd, KERN_PROC_ALL, 0, sizeof(*plist), &nproc);
+	if (plist == NULL)
+		errx(STATUS_ERROR, "kvm_getproc2() failed");
+
+	/*
+	 * Allocate memory which will be used to keep track of the
+	 * selection.
+	 */
+	if ((selected = malloc(nproc)) == NULL)
+		errx(STATUS_ERROR, "memory allocation failure");
+	memset(selected, 0, nproc);
+
+	/*
+	 * Refine the selection.
+	 */
+	for (; *argv != NULL; argv++) {
+		if ((rv = regcomp(&reg, *argv, REG_EXTENDED)) != 0) {
+			regerror(rv, &reg, buf, sizeof(buf));
+			errx(STATUS_BADUSAGE, "bad expression: %s", buf);
+		}
+
+		for (i = 0, kp = plist; i < nproc; i++, kp++) {
+			if ((kp->p_flag & P_SYSTEM) != 0 || kp->p_pid == mypid)
+				continue;
+
+			if (matchargs) {
+				if ((pargv = kvm_getargv2(kd, kp, 0)) == NULL)
+					continue;
+
+				j = 0;
+				while (j < sizeof(buf) && *pargv != NULL) {
+					j += snprintf(buf + j, sizeof(buf) - j,
+					    pargv[1] != NULL ? "%s " : "%s",
+					    pargv[0]);
+					pargv++;
+				}
+
+				mstr = buf;
+			} else
+				mstr = kp->p_comm;
+
+			rv = regexec(&reg, mstr, 1, &regmatch, 0);
+			if (rv == 0) {
+				if (fullmatch) {
+					if (regmatch.rm_so == 0 &&
+					    regmatch.rm_eo == strlen(mstr))
+						selected[i] = 1;
+				} else
+					selected[i] = 1;
+			} else if (rv != REG_NOMATCH) {
+				regerror(rv, &reg, buf, sizeof(buf));
+				errx(STATUS_ERROR, "regexec(): %s", buf);
+			}
+		}
+
+		regfree(&reg);
+	}
+
+	for (i = 0, kp = plist; i < nproc; i++, kp++) {
+		if ((kp->p_flag & P_SYSTEM) != 0)
+			continue;
+
+		SLIST_FOREACH(li, &ruidlist, li_chain)
+			if (kp->p_ruid == (uid_t)li->li_number)
+				break;
+		if (SLIST_FIRST(&ruidlist) != NULL && li == NULL) {
+			selected[i] = 0;
+			continue;
+		}
+	
+		SLIST_FOREACH(li, &rgidlist, li_chain)
+			if (kp->p_rgid == (gid_t)li->li_number)
+				break;
+		if (SLIST_FIRST(&rgidlist) != NULL && li == NULL) {
+			selected[i] = 0;
+			continue;
+		}
+
+		SLIST_FOREACH(li, &euidlist, li_chain)
+			if (kp->p_uid == (uid_t)li->li_number)
+				break;
+		if (SLIST_FIRST(&euidlist) != NULL && li == NULL) {
+			selected[i] = 0;
+			continue;
+		}
+
+		SLIST_FOREACH(li, &ppidlist, li_chain)
+			if (kp->p_ppid == (uid_t)li->li_number)
+				break;
+		if (SLIST_FIRST(&ppidlist) != NULL && li == NULL) {
+			selected[i] = 0;
+			continue;
+		}
+
+		SLIST_FOREACH(li, &pgrplist, li_chain)
+			if (kp->p__pgid == (uid_t)li->li_number)
+				break;
+		if (SLIST_FIRST(&pgrplist) != NULL && li == NULL) {
+			selected[i] = 0;
+			continue;
+		}
+
+		SLIST_FOREACH(li, &tdevlist, li_chain) {
+			if (li->li_number == -1 &&
+			    (kp->p_flag & P_CONTROLT) == 0)
+				break;
+			if (kp->p_tdev == (uid_t)li->li_number)
+				break;
+		}
+		if (SLIST_FIRST(&tdevlist) != NULL && li == NULL) {
+			selected[i] = 0;
+			continue;
+		}
+
+		SLIST_FOREACH(li, &sidlist, li_chain)
+			if (kp->p_sid == (uid_t)li->li_number)
+				break;
+		if (SLIST_FIRST(&sidlist) != NULL && li == NULL) {
+			selected[i] = 0;
+			continue;
+		}
+
+		if (argc == 0)
+			selected[i] = 1;
+	}
+
+	if (newest) {
+		bestsec = 0;
+		bestusec = 0;
+		bestidx = -1;
+
+		for (i = 0, kp = plist; i < nproc; i++, kp++) {
+			if (!selected[i])
+				continue;
+
+			if (kp->p_ustart_sec > bestsec ||
+			    (kp->p_ustart_sec == bestsec
+			    && kp->p_ustart_usec > bestusec)) {
+			    	bestsec = kp->p_ustart_sec;
+			    	bestusec = kp->p_ustart_usec;
+				bestidx = i;
+			}
+		}
+
+		memset(selected, 0, nproc);
+		if (bestidx != -1)
+			selected[bestidx] = 1;
+	}
+
+	/*
+	 * Take the appropriate action for each matched process, if any.
+	 */
+	for (i = 0, rv = 0, kp = plist; i < nproc; i++, kp++) {
+		if (kp->p_pid == mypid)
+			continue;
+		if (selected[i]) {
+			if (inverse)
+				continue;
+		} else if (!inverse)
+			continue;
+
+		if ((kp->p_flag & P_SYSTEM) != 0)
+			continue;
+
+		rv = 1;
+		(*action)(kp);
+	}
+
+	exit(rv ? STATUS_MATCH : STATUS_NOMATCH);
+}
+
+void
+usage(void)
+{
+	const char *ustr;
+
+	if (pgrep)
+		ustr = "[-flnvx] [-d delim]";
+	else
+		ustr = "[-signal] [-fnvx]";
+
+	fprintf(stderr,
+		"usage: %s %s [-G gid] [-P ppid] [-U uid] [-g pgrp] [-s sid]\n"
+		"             [-t tty] [-u euid] pattern ...\n", getprogname(),
+		ustr);
+
+	exit(STATUS_ERROR);
+}
+
+void
+killact(struct kinfo_proc2 *kp)
+{
+
+	if (kill(kp->p_pid, signum) == -1)
+		err(STATUS_ERROR, "signalling pid %d", (int)kp->p_pid);
+}
+
+void
+grepact(struct kinfo_proc2 *kp)
+{
+	char **argv;
+
+	if (longfmt && matchargs) {
+		if ((argv = kvm_getargv2(kd, kp, 0)) == NULL)
+			return;
+
+		printf("%d ", (int)kp->p_pid);
+		for (; *argv != NULL; argv++) {
+			printf("%s", *argv);
+			if (argv[1] != NULL)
+				putchar(' ');
+		}
+	} else if (longfmt)
+		printf("%d %s", (int)kp->p_pid, kp->p_comm);
+	else
+		printf("%d", (int)kp->p_pid);
+
+	printf("%s", delim);
+}
+
+void
+makelist(struct listhead *head, enum listtype type, char *src)
+{
+	struct list *li;
+	struct passwd *pw;
+	struct group *gr;
+	struct stat st;
+	char *sp, *p, buf[MAXPATHLEN];
+	int empty;
+
+	empty = 1;
+
+	while ((sp = strsep(&src, ",")) != NULL) {
+		if (*sp == '\0')
+			usage();
+
+		if ((li = malloc(sizeof(*li))) == NULL)
+			errx(STATUS_ERROR, "memory allocation failure");
+		SLIST_INSERT_HEAD(head, li, li_chain);
+		empty = 0;
+
+		li->li_number = (uid_t)strtol(sp, &p, 0);
+		if (*p == '\0') {
+			switch (type) {
+			case LT_PGRP:
+				if (li->li_number == 0)
+					li->li_number = getpgrp();
+				break;
+			case LT_SID:
+				if (li->li_number == 0)
+					li->li_number = getsid(mypid);
+				break;
+			case LT_TTY:
+				usage();
+			default:
+				break;
+			}
+			continue;
+		}
+
+		switch (type) {
+		case LT_USER:
+			if ((pw = getpwnam(sp)) == NULL)
+				errx(STATUS_BADUSAGE, "unknown user `%s'",
+				    optarg);
+			li->li_number = pw->pw_uid;
+			break;
+		case LT_GROUP:
+			if ((gr = getgrnam(sp)) == NULL)
+				errx(STATUS_BADUSAGE, "unknown group `%s'",
+				    optarg);
+			li->li_number = gr->gr_gid;
+			break;
+		case LT_TTY:
+			if (strcmp(sp, "-") == 0) {
+				li->li_number = -1;
+				break;
+			} else if (strcmp(sp, "co") == 0)
+				p = "console";
+			else if (strncmp(sp, "tty", 3) == 0)
+				p = sp;
+			else
+				p = NULL;
+
+			if (p == NULL)
+				snprintf(buf, sizeof(buf), "/dev/tty%s", sp);
+			else
+				snprintf(buf, sizeof(buf), "/dev/%s", p);
+
+			if (stat(buf, &st) < 0) {
+				if (errno == ENOENT)
+					errx(STATUS_BADUSAGE,
+					    "no such tty: `%s'", sp);
+				err(STATUS_ERROR, "stat(%s)", sp);
+			}
+
+			if ((st.st_mode & S_IFCHR) == 0)
+				errx(STATUS_BADUSAGE, "not a tty: `%s'", sp);
+
+			li->li_number = st.st_rdev;
+			break;
+		default:
+			usage();
+		};
+	}
+
+	if (empty)
+		usage();
+}