Use the new KERN_SYSVIPC_*_INFO sysctls; simonb@netbsd.org

2 files changed, 624 insertions, 283 deletions

diff --git a/usr.bin/ipcs/Makefile b/usr.bin/ipcs/Makefile
index 4de189283f5..1795367f323 100644
--- a/usr.bin/ipcs/Makefile
+++ b/usr.bin/ipcs/Makefile
@@ -1,8 +1,6 @@
-#	$OpenBSD: Makefile,v 1.3 1997/09/21 11:49:19 deraadt Exp $
+#	$OpenBSD: Makefile,v 1.4 2001/09/28 01:44:37 millert Exp $
 
 PROG=	ipcs
-BINGRP=	kmem
-BINMODE= 2555
 DPADD+=	${LIBKVM}
 LDADD+=	-lkvm
 
diff --git a/usr.bin/ipcs/ipcs.c b/usr.bin/ipcs/ipcs.c
index 78fb7834369..8e1ab1246af 100644
--- a/usr.bin/ipcs/ipcs.c
+++ b/usr.bin/ipcs/ipcs.c
@@ -1,5 +1,41 @@
-/*	$OpenBSD: ipcs.c,v 1.15 2001/08/13 15:10:21 millert Exp $	*/
-/*	$NetBSD: ipcs.c,v 1.10.6.1 1996/06/07 01:53:47 thorpej Exp $	*/
+/*	$OpenBSD: ipcs.c,v 1.16 2001/09/28 01:44:37 millert Exp $	*/
+/*	$NetBSD: ipcs.c,v 1.25 2000/06/16 03:58:20 simonb Exp $	*/
+
+/*-
+ * Copyright (c) 2000 The NetBSD Foundation, Inc.
+ * All rights reserved.
+ *
+ * This code is derived from software contributed to The NetBSD Foundation
+ * by Simon Burge.
+ *
+ * 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.
+ */
 
 /*
  * Copyright (c) 1994 SigmaSoft, Th. Lockert <tholo@sigmasoft.com>
@@ -28,10 +64,8 @@
  * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
-#include <sys/types.h>
 #include <sys/param.h>
-#include <sys/time.h>
-#include <sys/proc.h>
+#include <sys/sysctl.h>
 #define _KERNEL
 #include <sys/ipc.h>
 #include <sys/sem.h>
@@ -41,46 +75,43 @@
 
 #include <err.h>
 #include <fcntl.h>
-#include <kvm.h>
-#include <pwd.h>
 #include <grp.h>
+#include <kvm.h>
 #include <limits.h>
 #include <nlist.h>
 #include <paths.h>
+#include <pwd.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
+#include <time.h>
 #include <unistd.h>
 
-void	usage __P((void));
-
-extern	char *__progname;		/* from crt0.o */
-
-static struct nlist symbols[] = {
-	{"_sema"},
-#define X_SEMA		0
-	{"_seminfo"},
-#define X_SEMINFO	1
-	{"_semu"},
-#define X_SEMU		2
-	{"_msginfo"},
-#define X_MSGINFO	3
-	{"_msqids"},
-#define X_MSQIDS	4
-	{"_shminfo"},
-#define X_SHMINFO	5
-	{"_shmsegs"},
-#define X_SHMSEGS	6
-	{NULL}
-};
-
-static kvm_t *kd;
-
-char   *
-fmt_perm(mode)
-	u_short mode;
+void	cvt_time(time_t, char *, size_t);
+char   *fmt_perm(mode_t);
+void	ipcs_kvm(void);
+int	main(int, char **);
+void	msg_sysctl(void);
+void	sem_sysctl(void);
+void	shm_sysctl(void);
+void	show_msginfo(time_t, time_t, time_t, int, key_t, mode_t, uid_t,
+	    gid_t, uid_t, gid_t, u_long, u_long, u_long, pid_t, pid_t);
+void	show_msginfo_hdr(void);
+void	show_msgtotal(struct msginfo *);
+void	show_seminfo_hdr(void);
+void	show_seminfo(time_t, time_t, int, key_t, mode_t, uid_t, gid_t,
+	    uid_t, gid_t, int16_t);
+void	show_semtotal(struct seminfo *);
+void	show_shminfo(time_t, time_t, time_t, int, key_t, mode_t, uid_t,
+	    gid_t, uid_t, gid_t, u_int32_t, int, pid_t, pid_t);
+void	show_shminfo_hdr(void);
+void	show_shmtotal(struct shminfo *);
+__dead	void usage(void);
+
+char *
+fmt_perm(mode_t mode)
 {
-	static char buffer[100];
+	static char buffer[12];
 
 	buffer[0] = '-';
 	buffer[1] = '-';
@@ -98,17 +129,15 @@ fmt_perm(mode)
 }
 
 void
-cvt_time(t, buf)
-	time_t  t;
-	char   *buf;
+cvt_time(time_t t, char *buf, size_t buflen)
 {
 	struct tm *tm;
 
-	if (t == 0) {
-		strcpy(buf, "no-entry");
-	} else {
+	if (t == 0)
+		(void)strlcpy(buf, "no-entry", buflen);
+	else {
 		tm = localtime(&t);
-		sprintf(buf, "%2d:%02d:%02d",
+		(void)snprintf(buf, buflen, "%2d:%02d:%02d",
 			tm->tm_hour, tm->tm_min, tm->tm_sec);
 	}
 }
@@ -125,25 +154,17 @@ cvt_time(t, buf)
 #define PID		8
 #define TIME		16
 
+char	*core = NULL, *namelist = NULL;
+int	display = SHMINFO | MSGINFO | SEMINFO;
+int	option = 0;
+
 int
-main(argc, argv)
-	int     argc;
-	char   *argv[];
+main(int argc, char **argv)
 {
-	struct  semid_ds *sema;
-	struct  seminfo seminfo;
-	int     semu;
-	struct  msginfo msginfo;
-	struct  msqid_ds *msqids;
-	struct  shminfo shminfo;
-	struct  shmid_ds *shmsegs;
-	int     display = SHMINFO | MSGINFO | SEMINFO;
-	int     option = 0;
-	char   *core = NULL, *namelist = NULL;
-	int     i;
-
-	while ((i = getopt(argc, argv, "MmQqSsabC:cN:optT")) != -1)
-		switch (i) {
+	int ch;
+
+	while ((ch = getopt(argc, argv, "MmQqSsabC:cN:optT")) != -1)
+		switch (ch) {
 		case 'M':
 			display = SHMTOTAL;
 			break;
@@ -192,55 +213,506 @@ main(argc, argv)
 		default:
 			usage();
 		}
-	/*
-	 * Discard setgid privileges if not the running kernel so that bad
-	 * guys can't print interesting stuff from kernel memory.
-	 */
-	if (namelist != NULL || core != NULL) {
-		setegid(getgid());
-		setgid(getgid());
+
+	if (argc - optind > 0)
+		usage();
+
+	if (namelist == NULL && core == NULL) {
+		if (display & (MSGINFO | MSGTOTAL))
+			msg_sysctl();
+		if (display & (SHMINFO | SHMTOTAL))
+			shm_sysctl();
+		if (display & (SEMINFO | SEMTOTAL))
+			sem_sysctl();
+	} else
+		ipcs_kvm();
+
+	exit(0);
+}
+
+void
+show_msgtotal(struct msginfo *msginfo)
+{
+
+	printf("msginfo:\n");
+	printf("\tmsgmax: %6d\t(max characters in a message)\n",
+	    msginfo->msgmax);
+	printf("\tmsgmni: %6d\t(# of message queues)\n",
+	    msginfo->msgmni);
+	printf("\tmsgmnb: %6d\t(max characters in a message queue)\n",
+	    msginfo->msgmnb);
+	printf("\tmsgtql: %6d\t(max # of messages in system)\n",
+	    msginfo->msgtql);
+	printf("\tmsgssz: %6d\t(size of a message segment)\n",
+	    msginfo->msgssz);
+	printf("\tmsgseg: %6d\t(# of message segments in system)\n\n",
+	    msginfo->msgseg);
+}
+
+void
+show_shmtotal(struct shminfo *shminfo)
+{
+
+	printf("shminfo:\n");
+	printf("\tshmmax: %7d\t(max shared memory segment size)\n",
+	    shminfo->shmmax);
+	printf("\tshmmin: %7d\t(min shared memory segment size)\n",
+	    shminfo->shmmin);
+	printf("\tshmmni: %7d\t(max number of shared memory identifiers)\n",
+	    shminfo->shmmni);
+	printf("\tshmseg: %7d\t(max shared memory segments per process)\n",
+	    shminfo->shmseg);
+	printf("\tshmall: %7d\t(max amount of shared memory in pages)\n\n",
+	    shminfo->shmall);
+}
+
+void
+show_semtotal(struct seminfo *seminfo)
+{
+
+	printf("seminfo:\n");
+	printf("\tsemmni: %6d\t(# of semaphore identifiers)\n",
+	    seminfo->semmni);
+	printf("\tsemmns: %6d\t(# of semaphores in system)\n",
+	    seminfo->semmns);
+	printf("\tsemmnu: %6d\t(# of undo structures in system)\n",
+	    seminfo->semmnu);
+	printf("\tsemmsl: %6d\t(max # of semaphores per id)\n",
+	    seminfo->semmsl);
+	printf("\tsemopm: %6d\t(max # of operations per semop call)\n",
+	    seminfo->semopm);
+	printf("\tsemume: %6d\t(max # of undo entries per process)\n",
+	    seminfo->semume);
+	printf("\tsemusz: %6d\t(size in bytes of undo structure)\n",
+	    seminfo->semusz);
+	printf("\tsemvmx: %6d\t(semaphore maximum value)\n",
+	    seminfo->semvmx);
+	printf("\tsemaem: %6d\t(adjust on exit max value)\n\n",
+	    seminfo->semaem);
+}
+
+void
+show_msginfo_hdr(void)
+{
+
+	printf("Message Queues:\n");
+	printf("T     ID     KEY        MODE       OWNER    GROUP");
+	if (option & CREATOR)
+		printf("  CREATOR   CGROUP");
+	if (option & OUTSTANDING)
+		printf(" CBYTES  QNUM");
+	if (option & BIGGEST)
+		printf(" QBYTES");
+	if (option & PID)
+		printf(" LSPID LRPID");
+	if (option & TIME)
+		printf("    STIME    RTIME    CTIME");
+	printf("\n");
+}
+
+void
+show_msginfo(time_t stime, time_t rtime, time_t ctime, int ipcid, key_t key,
+    mode_t mode, uid_t uid, gid_t gid, uid_t cuid, gid_t cgid,
+    u_long cbytes, u_long qnum, u_long qbytes, pid_t lspid,
+    pid_t lrpid)
+{
+	char stime_buf[100], rtime_buf[100], ctime_buf[100];
+
+	if (option & TIME) {
+		cvt_time(stime, stime_buf, sizeof(stime_buf));
+		cvt_time(rtime, rtime_buf, sizeof(rtime_buf));
+		cvt_time(ctime, ctime_buf, sizeof(ctime_buf));
+	}
+
+	printf("q %6d %10ld %s %8s %8s", ipcid, key, fmt_perm(mode),
+	    user_from_uid(uid, 0), group_from_gid(gid, 0));
+
+	if (option & CREATOR)
+		printf(" %8s %8s", user_from_uid(cuid, 0),
+		    group_from_gid(cgid, 0));
+
+	if (option & OUTSTANDING)
+		printf(" %6lu %5lu", cbytes, qnum);
+
+	if (option & BIGGEST)
+		printf(" %6lu", qbytes);
+
+	if (option & PID)
+		printf(" %5d %5d", lspid, lrpid);
+
+	if (option & TIME)
+		printf(" %s %s %s", stime_buf, rtime_buf, ctime_buf);
+
+	printf("\n");
+}
+
+void
+show_shminfo_hdr(void)
+{
+
+	printf("Shared Memory:\n");
+	printf("T     ID     KEY        MODE       OWNER    GROUP");
+	if (option & CREATOR)
+		printf("  CREATOR   CGROUP");
+	if (option & OUTSTANDING)
+		printf(" NATTCH");
+	if (option & BIGGEST)
+		printf("   SEGSZ");
+	if (option & PID)
+		printf("  CPID  LPID");
+	if (option & TIME)
+		printf("    ATIME    DTIME    CTIME");
+	printf("\n");
+}
+
+void
+show_shminfo(time_t atime, time_t dtime, time_t ctime, int ipcid, key_t key,
+    mode_t mode, uid_t uid, gid_t gid, uid_t cuid, gid_t cgid,
+    u_int32_t nattch, int segsz, pid_t cpid, pid_t lpid)
+{
+	char atime_buf[100], dtime_buf[100], ctime_buf[100];
+
+	if (option & TIME) {
+		cvt_time(atime, atime_buf, sizeof(atime_buf));
+		cvt_time(dtime, dtime_buf, sizeof(dtime_buf));
+		cvt_time(ctime, ctime_buf, sizeof(ctime_buf));
+	}
+
+	printf("m %6d %10ld %s %8s %8s", ipcid, key, fmt_perm(mode),
+	    user_from_uid(uid, 0), group_from_gid(gid, 0));
+
+	if (option & CREATOR)
+		printf(" %8s %8s", user_from_uid(cuid, 0),
+		    group_from_gid(cgid, 0));
+
+	if (option & OUTSTANDING)
+		printf(" %6d", nattch);
+
+	if (option & BIGGEST)
+		printf(" %7d", segsz);
+
+	if (option & PID)
+		printf(" %5d %5d", cpid, lpid);
+
+	if (option & TIME)
+		printf(" %s %s %s",
+		    atime_buf,
+		    dtime_buf,
+		    ctime_buf);
+
+	printf("\n");
+}
+
+void
+show_seminfo_hdr(void)
+{
+
+	printf("Semaphores:\n");
+	printf("T     ID     KEY        MODE       OWNER    GROUP");
+	if (option & CREATOR)
+		printf("  CREATOR   CGROUP");
+	if (option & BIGGEST)
+		printf(" NSEMS");
+	if (option & TIME)
+		printf("    OTIME    CTIME");
+	printf("\n");
+}
+
+void
+show_seminfo(time_t otime, time_t ctime, int ipcid, key_t key, mode_t mode,
+    uid_t uid, gid_t gid, uid_t cuid, gid_t cgid, int16_t nsems)
+{
+	char ctime_buf[100], otime_buf[100];
+
+	if (option & TIME) {
+		cvt_time(otime, otime_buf, sizeof(otime_buf));
+		cvt_time(ctime, ctime_buf, sizeof(ctime_buf));
+	}
+
+	printf("s %6d %10ld %s %8s %8s", ipcid, key, fmt_perm(mode),
+	    user_from_uid(uid, 0), group_from_gid(gid, 0));
+
+	if (option & CREATOR)
+		printf(" %8s %8s", user_from_uid(cuid, 0),
+		    group_from_gid(cgid, 0));
+
+	if (option & BIGGEST)
+		printf(" %5d", nsems);
+
+	if (option & TIME)
+		printf(" %s %s", otime_buf, ctime_buf);
+
+	printf("\n");
+}
+
+void
+msg_sysctl(void)
+{
+	struct msg_sysctl_info *msgsi;
+	char *buf;
+	int mib[3];
+	size_t len;
+	int i, valid;
+
+	mib[0] = CTL_KERN;
+	mib[1] = KERN_SYSVMSG;
+	len = sizeof(valid);
+	if (sysctl(mib, 2, &valid, &len, NULL, NULL) < 0) {
+		warn("sysctl(KERN_SYSVMSG)");
+		return;
+	}
+	if (!valid) {
+		warnx("SVID messages facility not configured in the system");
+		return;
+	}
+
+	mib[0] = CTL_KERN;
+	mib[1] = KERN_SYSVIPC_INFO;
+	mib[2] = KERN_SYSVIPC_MSG_INFO;
+
+	if (!(display & MSGINFO)) {
+		/* totals only */
+		len = sizeof(struct msginfo);
+	} else {
+		if (sysctl(mib, 3, NULL, &len, NULL, NULL) < 0) {
+			warn("sysctl(KERN_SYSVIPC_MSG_INFO)");
+			return;
+		}
+	}
+
+	if ((buf = malloc(len)) == NULL)
+		err(1, "malloc");
+	msgsi = (struct msg_sysctl_info *)buf;
+	if (sysctl(mib, 3, msgsi, &len, NULL, NULL) < 0) {
+		warn("sysctl(KERN_SYSVIPC_MSG_INFO)");
+		return;
+	}
+
+	if (display & MSGTOTAL)
+		show_msgtotal(&msgsi->msginfo);
+
+	if (display & MSGINFO) {
+		show_msginfo_hdr();
+		for (i = 0; i < msgsi->msginfo.msgmni; i++) {
+			struct msqid_ds *msqptr = &msgsi->msgids[i];
+			if (msqptr->msg_qbytes != 0)
+				show_msginfo(msqptr->msg_stime,
+				    msqptr->msg_rtime,
+				    msqptr->msg_ctime,
+				    IXSEQ_TO_IPCID(i, msqptr->msg_perm),
+				    msqptr->msg_perm.key,
+				    msqptr->msg_perm.mode,
+				    msqptr->msg_perm.uid,
+				    msqptr->msg_perm.gid,
+				    msqptr->msg_perm.cuid,
+				    msqptr->msg_perm.cgid,
+				    msqptr->msg_cbytes,
+				    msqptr->msg_qnum,
+				    msqptr->msg_qbytes,
+				    msqptr->msg_lspid,
+				    msqptr->msg_lrpid);
+		}
+		printf("\n");
+	}
+}
+
+void
+shm_sysctl(void)
+{
+	struct shm_sysctl_info *shmsi;
+	char *buf;
+	int mib[3];
+	size_t len;
+	int i /*, valid */;
+	long valid;
+
+	mib[0] = CTL_KERN;
+	mib[1] = KERN_SYSVSHM;
+	len = sizeof(valid);
+	if (sysctl(mib, 2, &valid, &len, NULL, NULL) < 0) {
+		warn("sysctl(KERN_SYSVSHM)");
+		return;
+	}
+	if (!valid) {
+		warnx("SVID shared memory facility not configured in "
+		    "the system");
+		return;
+	}
+
+	mib[0] = CTL_KERN;
+	mib[1] = KERN_SYSVIPC_INFO;
+	mib[2] = KERN_SYSVIPC_SHM_INFO;
+
+	if (!(display & SHMINFO)) {
+		/* totals only */
+		len = sizeof(struct shminfo);
+	} else {
+		if (sysctl(mib, 3, NULL, &len, NULL, NULL) < 0) {
+			warn("sysctl(KERN_SYSVIPC_SHM_INFO)");
+			return;
+		}
+	}
+
+	if ((buf = malloc(len)) == NULL)
+		err(1, "malloc");
+	shmsi = (struct shm_sysctl_info *)buf;
+	if (sysctl(mib, 3, shmsi, &len, NULL, NULL) < 0) {
+		warn("sysctl(KERN_SYSVIPC_SHM_INFO)");
+		return;
+	}
+
+	if (display & SHMTOTAL)
+		show_shmtotal(&shmsi->shminfo);
+
+	if (display & SHMINFO) {
+		show_shminfo_hdr();
+		for (i = 0; i < shmsi->shminfo.shmmni; i++) {
+			struct shmid_ds *shmptr = &shmsi->shmids[i];
+			if (shmptr->shm_perm.mode & 0x0800)
+				show_shminfo(shmptr->shm_atime,
+				    shmptr->shm_dtime,
+				    shmptr->shm_ctime,
+				    IXSEQ_TO_IPCID(i, shmptr->shm_perm),
+				    shmptr->shm_perm.key,
+				    shmptr->shm_perm.mode,
+				    shmptr->shm_perm.uid,
+				    shmptr->shm_perm.gid,
+				    shmptr->shm_perm.cuid,
+				    shmptr->shm_perm.cgid,
+				    shmptr->shm_nattch,
+				    shmptr->shm_segsz,
+				    shmptr->shm_cpid,
+				    shmptr->shm_lpid);
+		}
+		printf("\n");
+	}
+}
+
+void
+sem_sysctl(void)
+{
+	struct sem_sysctl_info *semsi;
+	char *buf;
+	int mib[3];
+	size_t len;
+	int i, valid;
+
+	mib[0] = CTL_KERN;
+	mib[1] = KERN_SYSVSEM;
+	len = sizeof(valid);
+	if (sysctl(mib, 2, &valid, &len, NULL, NULL) < 0) {
+		warn("sysctl(KERN_SYSVSEM)");
+		return;
+	}
+	if (!valid) {
+		warnx("SVID shared memory facility not configured in "
+		    "the system");
+		return;
+	}
+
+	mib[0] = CTL_KERN;
+	mib[1] = KERN_SYSVIPC_INFO;
+	mib[2] = KERN_SYSVIPC_SEM_INFO;
+
+	if (!(display & SEMINFO)) {
+		/* totals only */
+		len = sizeof(struct seminfo);
+	} else {
+		if (sysctl(mib, 3, NULL, &len, NULL, NULL) < 0) {
+			warn("sysctl(KERN_SYSVIPC_SEM_INFO)");
+			return;
+		}
 	}
-	if ((kd = kvm_open(namelist, core, NULL, O_RDONLY, "ipcs")) == NULL)
-		exit(1);
 
-	setegid(getgid());
-	setgid(getgid());
+	if ((buf = malloc(len)) == NULL)
+		err(1, "malloc");
+	semsi = (struct sem_sysctl_info *)buf;
+	if (sysctl(mib, 3, semsi, &len, NULL, NULL) < 0) {
+		warn("sysctl(KERN_SYSVIPC_SEM_INFO)");
+		return;
+	}
+
+	if (display & SEMTOTAL)
+		show_semtotal(&semsi->seminfo);
+
+	if (display & SEMINFO) {
+		show_seminfo_hdr();
+		for (i = 0; i < semsi->seminfo.semmni; i++) {
+			struct semid_ds *semaptr = &semsi->semids[i];
+			if ((semaptr->sem_perm.mode & SEM_ALLOC) != 0)
+				show_seminfo(semaptr->sem_otime,
+				    semaptr->sem_ctime,
+				    IXSEQ_TO_IPCID(i, semaptr->sem_perm),
+				    semaptr->sem_perm.key,
+				    semaptr->sem_perm.mode,
+				    semaptr->sem_perm.uid,
+				    semaptr->sem_perm.gid,
+				    semaptr->sem_perm.cuid,
+				    semaptr->sem_perm.cgid,
+				    semaptr->sem_nsems);
+		}
+		printf("\n");
+	}
+}
+
+void
+ipcs_kvm(void)
+{
+	struct msginfo msginfo;
+	struct msqid_ds *msqids;
+	struct seminfo seminfo;
+	struct semid_ds *sema;
+	struct shminfo shminfo;
+	struct shmid_ds *shmsegs;
+	kvm_t *kd;
+	char errbuf[_POSIX2_LINE_MAX];
+	int i;
+	struct nlist symbols[] = {
+		{"_sema"},
+	#define X_SEMA		0
+		{"_seminfo"},
+	#define X_SEMINFO	1
+		{"_semu"},
+	#define X_SEMU		2
+		{"_msginfo"},
+	#define X_MSGINFO	3
+		{"_msqids"},
+	#define X_MSQIDS	4
+		{"_shminfo"},
+	#define X_SHMINFO	5
+		{"_shmsegs"},
+	#define X_SHMSEGS	6
+		{NULL}
+	};
+
+	if ((kd = kvm_openfiles(namelist, core, NULL, O_RDONLY,
+	    errbuf)) == NULL)
+		errx(1, "can't open kvm: %s", errbuf);
 
 	switch (kvm_nlist(kd, symbols)) {
 	case 0:
 		break;
 	case -1:
-		errx(1, "unable to read kernel symbol table.");
+		errx(1, "%s: unable to read symbol table.",
+		    namelist == NULL ? _PATH_UNIX : namelist);
+		/* NOTREACHED */
 	default:
 #ifdef notdef		/* they'll be told more civilly later */
 		warnx("nlist failed");
 		for (i = 0; symbols[i].n_name != NULL; i++)
 			if (symbols[i].n_value == 0)
-				warnx("symbol %s not found",
-				    symbols[i].n_name);
-		break;
+				warnx("symbol %s not found", symbols[i].n_name);
 #endif
+		break;
 	}
 
 	if ((display & (MSGINFO | MSGTOTAL)) &&
 	    (kvm_read(kd, symbols[X_MSGINFO].n_value,
 	     &msginfo, sizeof(msginfo)) == sizeof(msginfo))) {
 
-		if (display & MSGTOTAL) {
-			printf("msginfo:\n");
-			printf("\tmsgmax: %6d\t(max characters in a message)\n",
-			    msginfo.msgmax);
-			printf("\tmsgmni: %6d\t(# of message queues)\n",
-			    msginfo.msgmni);
-			printf("\tmsgmnb: %6d\t(max characters in a message queue)\n",
-			    msginfo.msgmnb);
-			printf("\tmsgtql: %6d\t(max # of messages in system)\n",
-			    msginfo.msgtql);
-			printf("\tmsgssz: %6d\t(size of a message segment)\n",
-			    msginfo.msgssz);
-			printf("\tmsgseg: %6d\t(# of message segments in system)\n\n",
-			    msginfo.msgseg);
-		}
+		if (display & MSGTOTAL)
+			show_msgtotal(&msginfo);
+
 		if (display & MSGINFO) {
 			struct msqid_ds *xmsqids;
 
@@ -258,88 +730,41 @@ main(argc, argv)
 				errx(1, "kvm_read (msqids): %s",
 				    kvm_geterr(kd));
 
-			printf("Message Queues:\n");
-			printf("T     ID     KEY        MODE       OWNER    GROUP");
-			if (option & CREATOR)
-				printf("  CREATOR   CGROUP");
-			if (option & OUTSTANDING)
-				printf(" CBYTES  QNUM");
-			if (option & BIGGEST)
-				printf(" QBYTES");
-			if (option & PID)
-				printf(" LSPID LRPID");
-			if (option & TIME)
-				printf("   STIME    RTIME    CTIME");
-			printf("\n");
-			for (i = 0; i < msginfo.msgmni; i += 1) {
-				if (xmsqids[i].msg_qbytes != 0) {
-					char    stime_buf[100], rtime_buf[100],
-					        ctime_buf[100];
-					struct msqid_ds *msqptr = &xmsqids[i];
-
-					cvt_time(msqptr->msg_stime, stime_buf);
-					cvt_time(msqptr->msg_rtime, rtime_buf);
-					cvt_time(msqptr->msg_ctime, ctime_buf);
-
-					printf("q %6d %10ld %s %8s %8s",
+			show_msginfo_hdr();
+			for (i = 0; i < msginfo.msgmni; i++) {
+				struct msqid_ds *msqptr = &xmsqids[i];
+				if (msqptr->msg_qbytes != 0)
+					show_msginfo(msqptr->msg_stime,
+					    msqptr->msg_rtime,
+					    msqptr->msg_ctime,
 					    IXSEQ_TO_IPCID(i, msqptr->msg_perm),
 					    msqptr->msg_perm.key,
-					    fmt_perm(msqptr->msg_perm.mode),
-					    user_from_uid(msqptr->msg_perm.uid, 0),
-					    group_from_gid(msqptr->msg_perm.gid, 0));
-
-					if (option & CREATOR)
-						printf(" %8s %8s",
-						    user_from_uid(msqptr->msg_perm.cuid, 0),
-						    group_from_gid(msqptr->msg_perm.cgid, 0));
-
-					if (option & OUTSTANDING)
-						printf(" %6lu %6lu",
-						    msqptr->msg_cbytes,
-						    msqptr->msg_qnum);
-
-					if (option & BIGGEST)
-						printf(" %6lu",
-						    msqptr->msg_qbytes);
-
-					if (option & PID)
-						printf(" %6d %6d",
-						    msqptr->msg_lspid,
-						    msqptr->msg_lrpid);
-
-					if (option & TIME)
-						printf(" %s %s %s",
-						    stime_buf,
-						    rtime_buf,
-						    ctime_buf);
-
-					printf("\n");
-				}
+					    msqptr->msg_perm.mode,
+					    msqptr->msg_perm.uid,
+					    msqptr->msg_perm.gid,
+					    msqptr->msg_perm.cuid,
+					    msqptr->msg_perm.cgid,
+					    msqptr->msg_cbytes,
+					    msqptr->msg_qnum,
+					    msqptr->msg_qbytes,
+					    msqptr->msg_lspid,
+					    msqptr->msg_lrpid);
 			}
 			printf("\n");
 		}
-	} else
+	} else {
 		if (display & (MSGINFO | MSGTOTAL)) {
-			fprintf(stderr,
-			    "SVID messages facility not configured in the system\n");
+			warnx("SVID messages facility not configured in "
+			    "the system");
 		}
+	}
 	if ((display & (SHMINFO | SHMTOTAL)) &&
 	    (kvm_read(kd, symbols[X_SHMINFO].n_value, &shminfo,
 	     sizeof(shminfo)) == sizeof(shminfo))) {
 
-		if (display & SHMTOTAL) {
-			printf("shminfo:\n");
-			printf("\tshmmax: %7d\t(max shared memory segment size)\n",
-			    shminfo.shmmax);
-			printf("\tshmmin: %7d\t(min shared memory segment size)\n",
-			    shminfo.shmmin);
-			printf("\tshmmni: %7d\t(max number of shared memory identifiers)\n",
-			    shminfo.shmmni);
-			printf("\tshmseg: %7d\t(max shared memory segments per process)\n",
-			    shminfo.shmseg);
-			printf("\tshmall: %7d\t(max amount of shared memory in pages)\n\n",
-			    shminfo.shmall);
-		}
+		if (display & SHMTOTAL)
+			show_shmtotal(&shminfo);
+
 		if (display & SHMINFO) {
 			struct shmid_ds *xshmids;
 
@@ -357,96 +782,40 @@ main(argc, argv)
 				errx(1, "kvm_read (shmsegs): %s",
 				    kvm_geterr(kd));
 
-			printf("Shared Memory:\n");
-			printf("T     ID     KEY        MODE       OWNER    GROUP");
-			if (option & CREATOR)
-				printf("  CREATOR   CGROUP");
-			if (option & OUTSTANDING)
-				printf(" NATTCH");
-			if (option & BIGGEST)
-				printf("  SEGSZ");
-			if (option & PID)
-				printf("  CPID  LPID");
-			if (option & TIME)
-				printf("   ATIME    DTIME    CTIME");
-			printf("\n");
-			for (i = 0; i < shminfo.shmmni; i += 1) {
-				if (xshmids[i].shm_perm.mode & 0x0800) {
-					char    atime_buf[100], dtime_buf[100],
-					        ctime_buf[100];
-					struct shmid_ds *shmptr = &xshmids[i];
-
-					cvt_time(shmptr->shm_atime, atime_buf);
-					cvt_time(shmptr->shm_dtime, dtime_buf);
-					cvt_time(shmptr->shm_ctime, ctime_buf);
-
-					printf("m %6d %10ld %s %8s %8s",
+			show_shminfo_hdr();
+			for (i = 0; i < shminfo.shmmni; i++) {
+				struct shmid_ds *shmptr = &xshmids[i];
+				if (shmptr->shm_perm.mode & 0x0800)
+					show_shminfo(shmptr->shm_atime,
+					    shmptr->shm_dtime,
+					    shmptr->shm_ctime,
 					    IXSEQ_TO_IPCID(i, shmptr->shm_perm),
 					    shmptr->shm_perm.key,
-					    fmt_perm(shmptr->shm_perm.mode),
-					    user_from_uid(shmptr->shm_perm.uid, 0),
-					    group_from_gid(shmptr->shm_perm.gid, 0));
-
-					if (option & CREATOR)
-						printf(" %8s %8s",
-						    user_from_uid(shmptr->shm_perm.cuid, 0),
-						    group_from_gid(shmptr->shm_perm.cgid, 0));
-
-					if (option & OUTSTANDING)
-						printf(" %6d",
-						    shmptr->shm_nattch);
-
-					if (option & BIGGEST)
-						printf(" %6d",
-						    shmptr->shm_segsz);
-
-					if (option & PID)
-						printf(" %6d %6d",
-						    shmptr->shm_cpid,
-						    shmptr->shm_lpid);
-
-					if (option & TIME)
-						printf(" %s %s %s",
-						    atime_buf,
-						    dtime_buf,
-						    ctime_buf);
-
-					printf("\n");
-				}
+					    shmptr->shm_perm.mode,
+					    shmptr->shm_perm.uid,
+					    shmptr->shm_perm.gid,
+					    shmptr->shm_perm.cuid,
+					    shmptr->shm_perm.cgid,
+					    shmptr->shm_nattch,
+					    shmptr->shm_segsz,
+					    shmptr->shm_cpid,
+					    shmptr->shm_lpid);
 			}
 			printf("\n");
 		}
 	} else
 		if (display & (SHMINFO | SHMTOTAL)) {
-			fprintf(stderr,
-			    "SVID shared memory facility not configured in the system\n");
+			warnx("SVID shared memory facility not configured in "
+			    "the system");
 		}
 	if ((display & (SEMINFO | SEMTOTAL)) &&
 	    (kvm_read(kd, symbols[X_SEMINFO].n_value, &seminfo,
 	     sizeof(seminfo)) == sizeof(seminfo))) {
 		struct semid_ds *xsema;
 
-		if (display & SEMTOTAL) {
-			printf("seminfo:\n");
-			printf("\tsemmni: %6d\t(# of semaphore identifiers)\n",
-			    seminfo.semmni);
-			printf("\tsemmns: %6d\t(# of semaphores in system)\n",
-			    seminfo.semmns);
-			printf("\tsemmnu: %6d\t(# of undo structures in system)\n",
-			    seminfo.semmnu);
-			printf("\tsemmsl: %6d\t(max # of semaphores per id)\n",
-			    seminfo.semmsl);
-			printf("\tsemopm: %6d\t(max # of operations per semop call)\n",
-			    seminfo.semopm);
-			printf("\tsemume: %6d\t(max # of undo entries per process)\n",
-			    seminfo.semume);
-			printf("\tsemusz: %6d\t(size in bytes of undo structure)\n",
-			    seminfo.semusz);
-			printf("\tsemvmx: %6d\t(semaphore maximum value)\n",
-			    seminfo.semvmx);
-			printf("\tsemaem: %6d\t(adjust on exit max value)\n\n",
-			    seminfo.semaem);
-		}
+		if (display & SEMTOTAL)
+			show_semtotal(&seminfo);
+
 		if (display & SEMINFO) {
 			if (kvm_read(kd, symbols[X_SEMA].n_value, &sema,
 			    sizeof(sema)) != sizeof(sema))
@@ -462,65 +831,39 @@ main(argc, argv)
 				errx(1, "kvm_read (sema): %s",
 				    kvm_geterr(kd));
 
-			printf("Semaphores:\n");
-			printf("T     ID     KEY        MODE       OWNER    GROUP");
-			if (option & CREATOR)
-				printf("  CREATOR   CGROUP");
-			if (option & BIGGEST)
-				printf(" NSEMS");
-			if (option & TIME)
-				printf("   OTIME    CTIME");
-			printf("\n");
-			for (i = 0; i < seminfo.semmni; i += 1) {
-				if ((xsema[i].sem_perm.mode & SEM_ALLOC) != 0) {
-					char    ctime_buf[100], otime_buf[100];
-					struct semid_ds *semaptr = &xsema[i];
-
-					cvt_time(semaptr->sem_otime, otime_buf);
-					cvt_time(semaptr->sem_ctime, ctime_buf);
-
-					printf("s %6d %10ld %s %8s %8s",
+			show_seminfo_hdr();
+			for (i = 0; i < seminfo.semmni; i++) {
+				struct semid_ds *semaptr = &xsema[i];
+				if ((semaptr->sem_perm.mode & SEM_ALLOC) != 0)
+					show_seminfo(semaptr->sem_otime,
+					    semaptr->sem_ctime,
 					    IXSEQ_TO_IPCID(i, semaptr->sem_perm),
 					    semaptr->sem_perm.key,
-					    fmt_perm(semaptr->sem_perm.mode),
-					    user_from_uid(semaptr->sem_perm.uid, 0),
-					    group_from_gid(semaptr->sem_perm.gid, 0));
-
-					if (option & CREATOR)
-						printf(" %8s %8s",
-						    user_from_uid(semaptr->sem_perm.cuid, 0),
-						    group_from_gid(semaptr->sem_perm.cgid, 0));
-
-					if (option & BIGGEST)
-						printf(" %6d",
-						    semaptr->sem_nsems);
-
-					if (option & TIME)
-						printf(" %s %s",
-						    otime_buf,
-						    ctime_buf);
-
-					printf("\n");
-				}
+					    semaptr->sem_perm.mode,
+					    semaptr->sem_perm.uid,
+					    semaptr->sem_perm.gid,
+					    semaptr->sem_perm.cuid,
+					    semaptr->sem_perm.cgid,
+					    semaptr->sem_nsems);
 			}
 
 			printf("\n");
 		}
 	} else
 		if (display & (SEMINFO | SEMTOTAL)) {
-			fprintf(stderr, "SVID semaphores facility not configured in the system\n");
+			warnx("SVID semaphores facility not configured in "
+			    "the system");
 		}
 	kvm_close(kd);
-
-	exit(0);
 }
 
 void
-usage()
+usage(void)
 {
+	extern char *__progname;
 
 	fprintf(stderr,
-	    "usage: %s [-abcmopqst] [-C corefile] [-N namelist]\n",
+	    "usage: %s [-abcmopqstMQST] [-C corefile] [-N namelist]\n",
 	    __progname);
 	exit(1);
 }