Rodney Radford submitted ipcs and ipcrm (system V IPC stuff). They could use

some more work to shrink them down.

9 files changed, 1049 insertions, 28 deletions

diff --git a/AUTHORS b/AUTHORS
index 7e773020f..13fb781db 100644
--- a/AUTHORS
+++ b/AUTHORS
@@ -113,6 +113,9 @@ Bruce Perens <bruce@pixar.com>
     Original author of BusyBox in 1995, 1996. Some of his code can
     still be found hiding here and there...
 
+Rodney Radford <rradford@mindspring.com>
+    ipcs, ipcrm
+
 Tim Riker <Tim@Rikers.org>
     bug fixes, member of fan club
 
diff --git a/docs/busybox_header.pod b/docs/busybox_header.pod
index 35631b84e..5af92401c 100644
--- a/docs/busybox_header.pod
+++ b/docs/busybox_header.pod
@@ -89,15 +89,15 @@ Currently defined functions include:
 	fgrep, find, fold, free, freeramdisk, fsck.minix, ftpget, ftpput, getopt,
 	getty, grep, gunzip, gzip, halt, hdparm, head, hexdump, hostid, hostname,
 	httpd, hush, hwclock, id, ifconfig, ifdown, ifup, inetd, init, insmod,
-	install, ip, ipaddr, ipcalc, iplink, iproute, iptunnel, kill, killall,
-	klogd, lash, last, length, linuxrc, ln, loadfont, loadkmap, logger, login,
-	logname, logread, losetup, ls, lsmod, makedevs, md5sum, mesg, mkdir,
-	mkfifo, mkfs.minix, mknod, mkswap, mktemp, modprobe, more, mount, msh, mt,
-	mv, nameif, nc, netstat, nslookup, od, openvt, passwd, patch, pidof, ping,
-	ping6, pipe_progress, pivot_root, poweroff, printf, ps, pwd, rdate,
-	readlink, realpath, reboot, renice, reset, rm, rmdir, rmmod, route, rpm,
-	rpm2cpio, run-parts, rx, sed, seq, setkeycodes, sha1sum, sleep, sort,
-	start-stop-daemon, strings, stty, su, sulogin, swapoff, swapon, sync,
+	install, ip, ipaddr, ipcalc, ipcrm, ipcs, iplink, iproute, iptunnel, kill, 
+	killall, klogd, lash, last, length, linuxrc, ln, loadfont, loadkmap, 
+	logger, login, logname, logread, losetup, ls, lsmod, makedevs, md5sum, 
+	mesg, mkdir, mkfifo, mkfs.minix, mknod, mkswap, mktemp, modprobe, more, 
+	mount, msh, mt, mv, nameif, nc, netstat, nslookup, od, openvt, passwd, 
+	patch, pidof, ping, ping6, pipe_progress, pivot_root, poweroff, printf, ps,
+	pwd, rdate, readlink, realpath, reboot, renice, reset, rm, rmdir, rmmod, 
+	route, rpm, rpm2cpio, run-parts, rx, sed, seq, setkeycodes, sha1sum, sleep,
+	sort, start-stop-daemon, strings, stty, su, sulogin, swapoff, swapon, sync,
 	sysctl, syslogd, tail, tar, tee, telnet, telnetd, test, tftp, time, top,
 	touch, tr, traceroute, true, tty, udhcpc, udhcpd, umount, uname,
 	uncompress, uniq, unix2dos, unzip, uptime, usleep, uudecode, uuencode,
diff --git a/include/applets.h b/include/applets.h
index e0b18085a..a7578ba1a 100644
--- a/include/applets.h
+++ b/include/applets.h
@@ -320,6 +320,12 @@
 #ifdef CONFIG_IPCALC
 	APPLET(ipcalc, ipcalc_main, _BB_DIR_BIN, _BB_SUID_NEVER)
 #endif
+#ifdef CONFIG_IPCRM
+	APPLET(ipcrm, ipcrm_main, _BB_DIR_USR_BIN, _BB_SUID_ALWAYS)
+#endif
+#ifdef CONFIG_IPCS
+	APPLET(ipcs, ipcs_main, _BB_DIR_USR_BIN, _BB_SUID_ALWAYS)
+#endif
 #ifdef CONFIG_IPLINK
 	APPLET(iplink, iplink_main, _BB_DIR_BIN, _BB_SUID_NEVER)
 #endif
diff --git a/include/usage.h b/include/usage.h
index 5fb9858bc..017cb9c3e 100644
--- a/include/usage.h
+++ b/include/usage.h
@@ -1395,6 +1395,32 @@
 	"\t-h\t--hostname\tDisplay first resolved host name\n" \
 	"\t-s\t--silent\tDon't ever display error messages.")
 
+#define ipcrm_trivial_usage \
+	"[-[MQS] key] [-[mqs] id]"
+#define ipcrm_full_usage \
+	"The upper-case options MQS are used to remove a shared memory\n" \
+	"segment by an shmkey value. The lower-case options mqs are used\n" \
+	"to remove a segment by shmid value.\n" \
+	"\t-m | -M\tRemove the memory segment after the last detatch\n" \
+	"\t-q | -Q\tRemove the message queue\n" \
+	"\t-s | -S\tRemove the semaphore\n"
+
+#define ipcs_trivial_usage \
+	"[[-smq] -i shmid] | [[-asmq] [-tclup]]"
+#define ipcs_full_usage \
+	"\t-i\tspecify a specific resource id\n" \
+	"Resource specification:\n" \
+	"\t-m\tshared memory segments\n" \
+	"\t-q\tmessage queues\n" \
+	"\t-s\tsempahore arrays\n" \
+	"\t-a\tall (default)\n" \
+	"Output format:\n" \
+	"\t-t\ttime\n" \
+	"\t-p\tpid\n" \
+	"\t-s\tcreator\n" \
+	"\t-a\tlimits\n" \
+	"\t-i\tsummary\n"
+
 #define iplink_trivial_usage \
 	"{ set DEVICE { up | down | arp { on | off } | show [ DEVICE ] }"
 #define iplink_full_usage \
@@ -2080,18 +2106,30 @@
 	"$ printf \"Val=%d\\n\" 5\n" \
 	"Val=5\n"
 
+#if !defined(CONFIG_SELINUX) && !defined(CONFIG_PS_FEATURE_WIDE)
+#define USAGE_PS "\n\tThis version of ps accepts no options."
+#else
+#define USAGE_PS "\nOptions:"
+#endif
 #ifdef CONFIG_SELINUX
 #define USAGE_NONSELINUX(a)
 #else
 #define USAGE_NONSELINUX(a) a
 #endif
+#ifdef CONFIG_PS_FEATURE_WIDE
+#define USAGE_PS_WIDE(a) a
+#else
+#define USAGE_PS_WIDE(a)
+#endif
 
 #define ps_trivial_usage \
 	""
 #define ps_full_usage \
 	"Report process status\n" \
-	USAGE_NONSELINUX("\n\tThis version of ps accepts no options.") \
-	USAGE_SELINUX("\nOptions:\n\t-c\tshow SE Linux context")
+	USAGE_PS \
+	USAGE_SELINUX("\n\t-c\tshow SE Linux context") \
+	USAGE_PS_WIDE("\n\tw\twide output")
+
 
 #define ps_example_usage \
 	"$ ps\n" \
diff --git a/sysdeps/linux/defconfig b/sysdeps/linux/defconfig
index fd2b118e3..8848a6c37 100644
--- a/sysdeps/linux/defconfig
+++ b/sysdeps/linux/defconfig
@@ -397,6 +397,8 @@ CONFIG_DMESG=y
 # CONFIG_GETOPT is not set
 CONFIG_HEXDUMP=y
 # CONFIG_HWCLOCK is not set
+# CONFIG_IPCRM is not set
+# CONFIG_IPCS is not set
 # CONFIG_LOSETUP is not set
 # CONFIG_MKSWAP is not set
 CONFIG_MORE=y
diff --git a/util-linux/Config.in b/util-linux/Config.in
index 3c990b936..a1e0b0848 100644
--- a/util-linux/Config.in
+++ b/util-linux/Config.in
@@ -216,6 +216,21 @@ config CONFIG_LOSETUP
 	  file or block device, and to query the status of a loop device.  This
 	  version does not currently support enabling data encryption.
 
+config CONFIG_IPCRM
+	bool "ipcrm"
+	default n
+	help
+	  The ipcrm utility allows the removal of System V interprocess
+	  communication (IPC) objects and the associated data structures
+	  from the system.
+
+config CONFIG_IPCS
+	bool "ipcs"
+	default n
+	help
+	  The ipcs utility is used to provide information on the currently
+	  allocated System V interprocess (IPC) objects in the system.
+
 config CONFIG_MKSWAP
 	bool "mkswap"
 	default n
@@ -322,14 +337,18 @@ config CONFIG_FEATURE_MOUNT_LOOP
 	default n
 	depends on CONFIG_MOUNT || CONFIG_UMOUNT
 	help
-	  Enabling this feature allows mount to use the '-o' loop options,
-	  which lets you loop mount files.  Mount will automagically setup and
-	  free the necessary loop devices so you do not need to mess with the
-	  'losetup' utility unless you really want to.  This is really
-	  only useful if you plan to loop mount files.
+	  Enabling this feature allows automatic loopback mounts, meaning you can mount
+	  filesystems contained in normal files as well as in block devices.  The mount
+	  and umount commands will detect you are trying to mount a file instead of a
+	  block device, and transparently associate it with a loopback device (and free
+	  the loopback device on unmount) for you.
+	  
+	  You can still use the 'losetup' utility and mount the loopback device yourself
+	  if you need to do something advanced, such as specify an offset or cryptographic
+	  options to the loopback device.
 
 config CONFIG_FEATURE_MTAB_SUPPORT
-	bool "  Support for a real /etc/mtab (instead of /proc/mounts)"
+	bool "  Support for a /etc/mtab file (instead of symlink to /proc/mounts)"
 	default n
 	depends on CONFIG_MOUNT || CONFIG_UMOUNT
 	help
@@ -339,17 +358,9 @@ config CONFIG_FEATURE_MTAB_SUPPORT
 	  BusyBox have a read-only root filesystem, so they will leave this
 	  option disabled and BusyBox will use the /proc/mounts file.
 
-config CONFIG_FEATURE_MTAB_FILENAME
-	string "  mtab file location"
-	default "/etc/mtab"
-	depends on CONFIG_FEATURE_MTAB_SUPPORT
-	help
-	  Some people have a read only root filesystem, but they also wish to
-	  have the 'mount' utility create an mtab file listing the filesystems
-	  which have been mounted.  This option allows you to specify an alternative
-	  location for the mtab file, such as /var/mtab, or /tmp/mtab.  The default
-	  value is /etc/mtab, which is where this file is located on most desktop
-	  Linux systems.
+	  Note that even non-embedded developers probably want to have /etc/mtab
+	  be a symlink to /proc/mounts, since otherwise mtab can get out of sync
+	  with the real kernel mount state in numerous ways.
 
 config CONFIG_READPROFILE
 	bool "readprofile"
diff --git a/util-linux/Makefile.in b/util-linux/Makefile.in
index 9aaaf9f8f..504560c27 100644
--- a/util-linux/Makefile.in
+++ b/util-linux/Makefile.in
@@ -34,6 +34,8 @@ UTILLINUX-$(CONFIG_FSCK_MINIX)		+=fsck_minix.o
 UTILLINUX-$(CONFIG_GETOPT)		+=getopt.o
 UTILLINUX-$(CONFIG_HEXDUMP)		+=hexdump.o
 UTILLINUX-$(CONFIG_HWCLOCK)		+=hwclock.o
+UTILLINUX-$(CONFIG_IPCRM)		+=ipcrm.o
+UTILLINUX-$(CONFIG_IPCS)		+=ipcs.o
 UTILLINUX-$(CONFIG_LOSETUP)		+=losetup.o
 UTILLINUX-$(CONFIG_MKFS_MINIX)		+=mkfs_minix.o
 UTILLINUX-$(CONFIG_MKSWAP)		+=mkswap.o
diff --git a/util-linux/ipcrm.c b/util-linux/ipcrm.c
new file mode 100644
index 000000000..9e18752a3
--- /dev/null
+++ b/util-linux/ipcrm.c
@@ -0,0 +1,273 @@
+/*
+ * ipcrm.c -- utility to allow removal of IPC objects and data structures.
+ *
+ * 01 Sept 2004 - Rodney Radford <rradford@mindspring.com>
+ * Adapted for busybox from util-linux-2.12a.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ *
+ * --- Pre-busybox history from util-linux-2.12a ------------------------
+ *
+ * 1999-04-02 frank zago
+ * - can now remove several id's in the same call
+ *
+ * 1999-02-22 Arkadiusz Mi˙kiewicz <misiek@pld.ORG.PL>
+ * - added Native Language Support
+ *
+ * Original author - krishna balasubramanian 1993
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <errno.h>
+
+#include <sys/types.h>
+#include <sys/ipc.h>
+#include <sys/shm.h>
+#include <sys/msg.h>
+#include <sys/sem.h>
+
+/* X/OPEN tells us to use <sys/{types,ipc,sem}.h> for semctl() */
+/* X/OPEN tells us to use <sys/{types,ipc,msg}.h> for msgctl() */
+/* for getopt */
+#include <unistd.h>
+
+/* for tolower and isupper */
+#include <ctype.h>
+
+#include "busybox.h"
+
+#if defined (__GNU_LIBRARY__) && !defined(_SEM_SEMUN_UNDEFINED)
+/* union semun is defined by including <sys/sem.h> */
+#else
+/* according to X/OPEN we have to define it ourselves */
+union semun {
+	int val;
+	struct semid_ds *buf;
+	unsigned short int *array;
+	struct seminfo *__buf;
+};
+#endif
+
+typedef enum type_id {
+	SHM,
+	SEM,
+	MSG
+} type_id;
+
+static int
+remove_ids(type_id type, int argc, char **argv) {
+	int id;
+	int ret = 0;		/* for gcc */
+	char *end;
+	int nb_errors = 0;
+	union semun arg;
+
+	arg.val = 0;
+
+	while(argc) {
+
+		id = strtoul(argv[0], &end, 10);
+
+		if (*end != 0) {
+			bb_printf ("invalid id: %s\n", argv[0]);
+			nb_errors ++;
+		} else {
+			switch(type) {
+			case SEM:
+				ret = semctl (id, 0, IPC_RMID, arg);
+				break;
+
+			case MSG:
+				ret = msgctl (id, IPC_RMID, NULL);
+				break;
+				
+			case SHM:
+				ret = shmctl (id, IPC_RMID, NULL);
+				break;
+			}
+
+			if (ret) {
+				bb_printf ("cannot remove id %s (%s)\n",
+					argv[0], strerror(errno));
+				nb_errors ++;
+			}
+		}
+		argc--;
+		argv++;
+	}
+	
+	return(nb_errors);
+}
+
+static int deprecated_main(int argc, char **argv)
+{
+	if (argc < 3) {
+		bb_show_usage();
+		bb_fflush_stdout_and_exit(1);
+	}
+	
+	if (!strcmp(argv[1], "shm")) {
+		if (remove_ids(SHM, argc-2, &argv[2]))
+			bb_fflush_stdout_and_exit(1);
+	}
+	else if (!strcmp(argv[1], "msg")) {
+		if (remove_ids(MSG, argc-2, &argv[2]))
+			bb_fflush_stdout_and_exit(1);
+	} 
+	else if (!strcmp(argv[1], "sem")) {
+		if (remove_ids(SEM, argc-2, &argv[2]))
+			bb_fflush_stdout_and_exit(1);
+	}
+	else {
+		bb_printf ("unknown resource type: %s\n", argv[1]);
+		bb_show_usage();
+		bb_fflush_stdout_and_exit(1);
+	}
+
+	bb_printf ("resource(s) deleted\n");
+	return 0;
+}
+
+
+int ipcrm_main(int argc, char **argv)
+{
+	int   c;
+	int   error = 0;
+	char *prog = argv[0];
+
+	/* if the command is executed without parameters, do nothing */
+	if (argc == 1)
+		return 0;
+
+	/* check to see if the command is being invoked in the old way if so
+	   then run the old code */
+	if (strcmp(argv[1], "shm") == 0 ||
+		strcmp(argv[1], "msg") == 0 ||
+		strcmp(argv[1], "sem") == 0)
+		return deprecated_main(argc, argv);
+
+	/* process new syntax to conform with SYSV ipcrm */
+	while ((c = getopt(argc, argv, "q:m:s:Q:M:S:h?")) != -1) {
+		int result;
+		int id = 0;
+		int iskey = isupper(c);
+
+		/* needed to delete semaphores */
+		union semun arg;
+		arg.val = 0;
+
+		if ((c == '?') || (c == 'h'))
+		{
+			bb_show_usage();
+			return 0;
+		}
+
+		/* we don't need case information any more */
+		c = tolower(c);
+
+		/* make sure the option is in range */
+		if (c != 'q' && c != 'm' && c != 's') {
+			bb_show_usage();
+			error++;
+			return error;
+		}
+
+		if (iskey) {
+			/* keys are in hex or decimal */
+			key_t key = strtoul(optarg, NULL, 0);
+			if (key == IPC_PRIVATE) {
+				error++;
+				bb_fprintf(stderr, "%s: illegal key (%s)\n",
+					prog, optarg);
+				continue;
+			}
+
+			/* convert key to id */
+			id = ((c == 'q') ? msgget(key, 0) :
+				  (c == 'm') ? shmget(key, 0, 0) :
+				  semget(key, 0, 0));
+
+			if (id < 0) {
+				char *errmsg;
+				error++;
+				switch(errno) {
+				case EACCES:
+					errmsg = "permission denied for key";
+					break;
+				case EIDRM:
+					errmsg = "already removed key";
+					break;
+				case ENOENT:
+					errmsg = "invalid key";
+					break;
+				default:
+					errmsg = "unknown error in key";
+					break;
+				}
+				bb_fprintf(stderr, "%s: %s (%s)\n",
+					prog, errmsg, optarg);
+				continue;
+			}
+		} else {
+			/* ids are in decimal */
+			id = strtoul(optarg, NULL, 10);
+		}
+
+		result = ((c == 'q') ? msgctl(id, IPC_RMID, NULL) :
+			  (c == 'm') ? shmctl(id, IPC_RMID, NULL) : 
+			  semctl(id, 0, IPC_RMID, arg));
+
+		if (result < 0) {
+			char *errmsg;
+			error++;
+			switch(errno) {
+			case EACCES:
+			case EPERM:
+				errmsg = iskey
+					? "permission denied for key"
+					: "permission denied for id";
+				break;
+			case EINVAL:
+				errmsg = iskey
+					? "invalid key"
+					: "invalid id";
+				break;
+			case EIDRM:
+				errmsg = iskey
+					? "already removed key"
+					: "already removed id";
+				break;
+			default:
+				errmsg = iskey
+					? "unknown error in key"
+					: "unknown error in id";
+				break;
+			}
+			bb_fprintf(stderr, "%s: %s (%s)\n",
+				prog, errmsg, optarg);
+			continue;
+		}
+	}
+
+	/* print usage if we still have some arguments left over */
+	if (optind != argc) {
+		bb_show_usage();
+	}
+
+	/* exit value reflects the number of errors encountered */
+	return error;
+}
diff --git a/util-linux/ipcs.c b/util-linux/ipcs.c
new file mode 100644
index 000000000..23759eeda
--- /dev/null
+++ b/util-linux/ipcs.c
@@ -0,0 +1,686 @@
+/*
+ * ipcs.c -- provides information on allocated ipc resources.
+ *
+ * 01 Sept 2004 - Rodney Radford <rradford@mindspring.com>
+ * Adapted for busybox from util-linux-2.12a.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ *
+ * --- Pre-busybox history from util-linux-2.12a ------------------------
+ *
+ * 1999-02-22 Arkadiusz Mi˙kiewicz <misiek@pld.ORG.PL>
+ * - added Native Language Support
+ *
+ * Patched to display the key field -- hy@picksys.com 12/18/96
+ *
+ * Patch from arnolds@ifns.de (Heinz-Ado Arnolds) applied Mon Jul 1
+ * 19:30:41 1996 by janl@math.uio.no to add code missing in case PID:
+ * clauses.
+ *
+ * Patches from Mike Jagdis (jaggy@purplet.demon.co.uk) applied 
+ * Wed Feb 8 12:12:21 1995 by faith@cs.unc.edu to print numeric uids 
+ * if no passwd file entry.
+ *
+ * Modified Sat Oct  9 10:55:28 1993 for 0.99.13
+ * Original author unknown, may be "krishna balasub@cis.ohio-state.edu" 
+ *
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <getopt.h>
+#include <errno.h>
+#include <time.h>
+#include <pwd.h>
+#include <grp.h>
+
+/* X/OPEN tells us to use <sys/{types,ipc,sem}.h> for semctl() */
+/* X/OPEN tells us to use <sys/{types,ipc,msg}.h> for msgctl() */
+/* X/OPEN tells us to use <sys/{types,ipc,shm}.h> for shmctl() */
+#include <sys/types.h>
+#include <sys/ipc.h>
+#include <sys/sem.h>
+#include <sys/msg.h>
+#include <sys/shm.h>
+
+#include "busybox.h"
+
+/*-------------------------------------------------------------------*/
+/* SHM_DEST and SHM_LOCKED are defined in kernel headers,
+   but inside #ifdef __KERNEL__ ... #endif */
+#ifndef SHM_DEST
+/* shm_mode upper byte flags */
+#define SHM_DEST        01000   /* segment will be destroyed on last detach */
+#define SHM_LOCKED      02000   /* segment will not be swapped */
+#endif
+
+/* For older kernels the same holds for the defines below */
+#ifndef MSG_STAT
+#define MSG_STAT	11
+#define MSG_INFO	12
+#endif
+
+#ifndef SHM_STAT
+#define SHM_STAT        13
+#define SHM_INFO        14
+struct shm_info {
+	 int   used_ids;
+	 ulong shm_tot; /* total allocated shm */
+	 ulong shm_rss; /* total resident shm */
+	 ulong shm_swp; /* total swapped shm */
+	 ulong swap_attempts;
+	 ulong swap_successes;
+};
+#endif
+
+#ifndef SEM_STAT
+#define SEM_STAT	18
+#define SEM_INFO	19
+#endif
+
+/* Some versions of libc only define IPC_INFO when __USE_GNU is defined. */
+#ifndef IPC_INFO
+#define IPC_INFO        3
+#endif
+/*-------------------------------------------------------------------*/
+
+/* The last arg of semctl is a union semun, but where is it defined?
+   X/OPEN tells us to define it ourselves, but until recently
+   Linux include files would also define it. */
+#if defined (__GNU_LIBRARY__) && !defined(_SEM_SEMUN_UNDEFINED)
+/* union semun is defined by including <sys/sem.h> */
+#else
+/* according to X/OPEN we have to define it ourselves */
+union semun {
+	int val;
+	struct semid_ds *buf;
+	unsigned short int *array;
+	struct seminfo *__buf;
+};
+#endif
+
+/* X/OPEN (Jan 1987) does not define fields key, seq in struct ipc_perm;
+   libc 4/5 does not mention struct ipc_term at all, but includes
+   <linux/ipc.h>, which defines a struct ipc_perm with such fields.
+   glibc-1.09 has no support for sysv ipc.
+   glibc 2 uses __key, __seq */
+#if defined (__GNU_LIBRARY__) && __GNU_LIBRARY__ > 1
+#define KEY __key
+#else
+#define KEY key
+#endif
+
+#define LIMITS 1
+#define STATUS 2
+#define CREATOR 3
+#define TIME 4
+#define PID 5
+
+void do_shm (char format);
+void do_sem (char format);
+void do_msg (char format);
+void print_shm (int id);
+void print_msg (int id);
+void print_sem (int id);
+
+int ipcs_main (int argc, char **argv) {
+	int opt, msg = 0, sem = 0, shm = 0, id=0, print=0; 
+	char format = 0;
+	char options[] = "atclupsmqi:ih?";
+
+	while ((opt = getopt (argc, argv, options)) != -1) {
+		switch (opt) {
+		case 'i':
+			id = atoi (optarg);
+			print = 1;
+			break;
+		case 'a':
+			msg = shm = sem = 1;
+			break;
+		case 'q':
+			msg = 1;
+			break;
+		case 's':
+			sem = 1;
+			break;
+		case 'm':
+			shm = 1;
+			break;
+		case 't':
+			format = TIME;
+			break;
+		case 'c':
+			format = CREATOR;
+			break;
+		case 'p':
+			format = PID;
+			break;
+		case 'l':
+			format = LIMITS;
+			break;
+		case 'u':
+			format = STATUS;
+			break;
+		case 'h': 
+		case '?':
+			bb_show_usage();
+			bb_fflush_stdout_and_exit (0);
+		}
+	}
+
+	if  (print) {
+		if (shm) { 
+			print_shm (id);
+			bb_fflush_stdout_and_exit (0);
+		}
+		if (sem) { 
+			print_sem (id);
+			bb_fflush_stdout_and_exit (0);
+		}
+		if (msg) {
+			print_msg (id);
+			bb_fflush_stdout_and_exit (0);
+		}
+		bb_show_usage();
+		bb_fflush_stdout_and_exit (0);
+	}
+
+	if ( !shm && !msg && !sem)
+		msg = sem = shm = 1;
+	bb_printf ("\n");
+
+	if (shm) {	
+		do_shm (format);
+		bb_printf ("\n");
+	}
+	if (sem) {	
+		do_sem (format);
+		bb_printf ("\n");
+	}
+	if (msg) {	
+		do_msg (format);
+		bb_printf ("\n");
+	}
+	return 0;
+}
+
+
+static void
+print_perms (int id, struct ipc_perm *ipcp) {
+	struct passwd *pw;
+	struct group *gr;
+
+	bb_printf ("%-10d %-10o", id, ipcp->mode & 0777);
+
+	if ((pw = getpwuid(ipcp->cuid)))
+		bb_printf(" %-10s", pw->pw_name);
+	else
+		bb_printf(" %-10d", ipcp->cuid);
+	if ((gr = getgrgid(ipcp->cgid)))
+		bb_printf(" %-10s", gr->gr_name);
+	else
+		bb_printf(" %-10d", ipcp->cgid);
+
+	if ((pw = getpwuid(ipcp->uid)))
+		bb_printf(" %-10s", pw->pw_name);
+	else
+		bb_printf(" %-10d", ipcp->uid);
+	if ((gr = getgrgid(ipcp->gid)))
+		bb_printf(" %-10s\n", gr->gr_name);
+	else
+		bb_printf(" %-10d\n", ipcp->gid);
+}
+
+
+void do_shm (char format)
+{
+	int maxid, shmid, id;
+	struct shmid_ds shmseg;
+	struct shm_info shm_info;
+	struct shminfo shminfo;
+	struct ipc_perm *ipcp = &shmseg.shm_perm;
+	struct passwd *pw;
+
+	maxid = shmctl (0, SHM_INFO, (struct shmid_ds *) (void *) &shm_info);
+	if (maxid < 0) {
+		bb_printf ("kernel not configured for shared memory\n");
+		return;
+	}
+	
+	switch (format) {
+	case LIMITS:
+		bb_printf ("------ Shared Memory Limits --------\n");
+		if ((shmctl (0, IPC_INFO, (struct shmid_ds *) (void *) &shminfo)) < 0 )
+			return;
+		/* glibc 2.1.3 and all earlier libc's have ints as fields
+		   of struct shminfo; glibc 2.1.91 has unsigned long; ach */
+		bb_printf ("max number of segments = %lu\n",
+			(unsigned long) shminfo.shmmni);
+		bb_printf ("max seg size (kbytes) = %lu\n",
+			(unsigned long) (shminfo.shmmax >> 10));
+		bb_printf ("max total shared memory (pages) = %lu\n",
+			(unsigned long) shminfo.shmall);
+		bb_printf ("min seg size (bytes) = %lu\n",
+			(unsigned long) shminfo.shmmin);
+		return;
+
+	case STATUS:
+		bb_printf ("------ Shared Memory Status --------\n");
+		bb_printf ("segments allocated %d\n", shm_info.used_ids);
+		bb_printf ("pages allocated %ld\n", shm_info.shm_tot);
+		bb_printf ("pages resident  %ld\n", shm_info.shm_rss);
+		bb_printf ("pages swapped   %ld\n", shm_info.shm_swp);
+		bb_printf ("Swap performance: %ld attempts\t %ld successes\n", 
+			shm_info.swap_attempts, shm_info.swap_successes);
+		return;
+
+	case CREATOR:
+		bb_printf ("------ Shared Memory Segment Creators/Owners --------\n");
+		bb_printf ("%-10s %-10s %-10s %-10s %-10s %-10s\n",
+		 "shmid","perms","cuid","cgid","uid","gid");
+		break;
+
+	case TIME:
+		bb_printf ("------ Shared Memory Attach/Detach/Change Times --------\n");
+		bb_printf ("%-10s %-10s %-20s %-20s %-20s\n",
+			"shmid","owner","attached","detached","changed");
+		break;
+
+	case PID:
+		bb_printf ("------ Shared Memory Creator/Last-op --------\n");
+		bb_printf ("%-10s %-10s %-10s %-10s\n",
+			"shmid","owner","cpid","lpid");
+		break;
+
+	default:
+		bb_printf ("------ Shared Memory Segments --------\n");
+		bb_printf ("%-10s %-10s %-10s %-10s %-10s %-10s %-12s\n",
+			"key","shmid","owner","perms","bytes","nattch","status");
+		break;
+	}
+
+	for (id = 0; id <= maxid; id++) {
+		shmid = shmctl (id, SHM_STAT, &shmseg);
+		if (shmid < 0) 
+			continue;
+		if (format == CREATOR)  {
+			print_perms (shmid, ipcp);
+			continue;
+		}
+		pw = getpwuid(ipcp->uid);
+		switch (format) {
+		case TIME: 
+			if (pw)
+				bb_printf ("%-10d %-10.10s", shmid, pw->pw_name);
+			else
+				bb_printf ("%-10d %-10d", shmid, ipcp->uid);
+			/* ctime uses static buffer: use separate calls */
+			bb_printf("  %-20.16s", shmseg.shm_atime
+				   ? ctime(&shmseg.shm_atime) + 4 : "Not set");
+			bb_printf(" %-20.16s", shmseg.shm_dtime
+				   ? ctime(&shmseg.shm_dtime) + 4 : "Not set");
+			bb_printf(" %-20.16s\n", shmseg.shm_ctime
+				   ? ctime(&shmseg.shm_ctime) + 4 : "Not set");
+			break;
+		case PID:
+			if (pw)
+				bb_printf ("%-10d %-10.10s", shmid, pw->pw_name);
+			else
+				bb_printf ("%-10d %-10d", shmid, ipcp->uid);
+			bb_printf (" %-10d %-10d\n",
+				shmseg.shm_cpid, shmseg.shm_lpid);
+			break;
+			
+		default:
+				bb_printf("0x%08x ",ipcp->KEY );
+			if (pw)
+				bb_printf ("%-10d %-10.10s", shmid, pw->pw_name);
+			else
+				bb_printf ("%-10d %-10d", shmid, ipcp->uid);
+			bb_printf ("%-10o %-10lu %-10ld %-6s %-6s\n", 
+				ipcp->mode & 0777,
+				/*
+				 * earlier: int, Austin has size_t
+				 */
+				(unsigned long) shmseg.shm_segsz,
+				/*
+				 * glibc-2.1.3 and earlier has unsigned short;
+				 * Austin has shmatt_t
+				 */
+				(long) shmseg.shm_nattch,
+				ipcp->mode & SHM_DEST ? "dest" : " ",
+				ipcp->mode & SHM_LOCKED ? "locked" : " ");
+			break;
+		}
+	}
+	return;
+}
+
+
+void do_sem (char format)
+{
+	int maxid, semid, id;
+	struct semid_ds semary;
+	struct seminfo seminfo;
+	struct ipc_perm *ipcp = &semary.sem_perm;
+	struct passwd *pw;
+	union semun arg;
+
+	arg.array = (ushort *)  (void *) &seminfo;
+	maxid = semctl (0, 0, SEM_INFO, arg);
+	if (maxid < 0) {
+		bb_printf ("kernel not configured for semaphores\n");
+		return;
+	}
+	
+	switch (format) {
+	case LIMITS:
+		bb_printf ("------ Semaphore Limits --------\n");
+		arg.array = (ushort *) (void *) &seminfo; /* damn union */
+		if ((semctl (0, 0, IPC_INFO, arg)) < 0 )
+			return;
+		bb_printf ("max number of arrays = %d\n", seminfo.semmni);
+		bb_printf ("max semaphores per array = %d\n", seminfo.semmsl);
+		bb_printf ("max semaphores system wide = %d\n", seminfo.semmns);
+		bb_printf ("max ops per semop call = %d\n", seminfo.semopm);
+		bb_printf ("semaphore max value = %d\n", seminfo.semvmx);
+		return;
+
+	case STATUS:
+		bb_printf ("------ Semaphore Status --------\n");
+		bb_printf ("used arrays = %d\n", seminfo.semusz);
+		bb_printf ("allocated semaphores = %d\n", seminfo.semaem);
+		return;
+
+	case CREATOR:
+		bb_printf ("------ Semaphore Arrays Creators/Owners --------\n");
+		bb_printf ("%-10s %-10s %-10s %-10s %-10s %-10s\n",
+		 "semid","perms","cuid","cgid","uid","gid");
+		break;
+
+	case TIME:
+		bb_printf ("------ Shared Memory Operation/Change Times --------\n");
+		bb_printf ("%-8s %-10s %-26.24s %-26.24s\n",
+			"shmid","owner","last-op","last-changed");
+		break;
+
+	case PID:
+		break;
+
+	default:
+		bb_printf ("------ Semaphore Arrays --------\n");
+		bb_printf ("%-10s %-10s %-10s %-10s %-10s\n", 
+			"key","semid","owner","perms","nsems");
+		break;
+	}
+
+	for (id = 0; id <= maxid; id++) {
+		arg.buf = (struct semid_ds *) &semary;
+		semid = semctl (id, 0, SEM_STAT, arg);
+		if (semid < 0)
+			continue;
+		if (format == CREATOR)  {
+			print_perms (semid, ipcp);
+			continue;
+		}
+		pw = getpwuid(ipcp->uid);
+		switch (format) {
+		case TIME: 
+			if (pw)
+				bb_printf ("%-8d %-10.10s", semid, pw->pw_name);
+			else
+				bb_printf ("%-8d %-10d", semid, ipcp->uid);
+			bb_printf ("  %-26.24s", semary.sem_otime
+				? ctime(&semary.sem_otime) : "Not set");
+			bb_printf (" %-26.24s\n", semary.sem_ctime
+				? ctime(&semary.sem_ctime) : "Not set");
+			break;
+		case PID:
+			break;
+			
+		default:
+				bb_printf("0x%08x ", ipcp->KEY);
+			if (pw)
+				bb_printf ("%-10d %-10.9s", semid, pw->pw_name);
+			else
+				bb_printf ("%-10d %-9d", semid, ipcp->uid);
+					bb_printf ("%-10o %-10ld\n",
+				ipcp->mode & 0777,
+				/*
+				 * glibc-2.1.3 and earlier has unsigned short;
+				 * glibc-2.1.91 has variation between
+				 * unsigned short and unsigned long
+				 * Austin prescribes unsigned short.
+				 */
+				(long) semary.sem_nsems);
+			break;
+		}
+	}
+}
+
+
+void do_msg (char format)
+{
+	int maxid, msqid, id;
+	struct msqid_ds msgque;
+	struct msginfo msginfo;
+	struct ipc_perm *ipcp = &msgque.msg_perm;
+	struct passwd *pw;
+
+	maxid = msgctl (0, MSG_INFO, (struct msqid_ds *) (void *) &msginfo);
+	if (maxid < 0) {
+		bb_printf ("kernel not configured for message queues\n");
+		return;
+	}
+	
+	switch (format) {
+	case LIMITS:
+		if ((msgctl (0, IPC_INFO, (struct msqid_ds *) (void *) &msginfo)) < 0 )
+			return;
+		bb_printf ("------ Messages: Limits --------\n");
+		bb_printf ("max queues system wide = %d\n", msginfo.msgmni);
+		bb_printf ("max size of message (bytes) = %d\n", msginfo.msgmax);
+		bb_printf ("default max size of queue (bytes) = %d\n", msginfo.msgmnb);
+		return;
+
+	case STATUS:
+		bb_printf ("------ Messages: Status --------\n");
+		bb_printf ("allocated queues = %d\n", msginfo.msgpool);
+		bb_printf ("used headers = %d\n", msginfo.msgmap);
+		bb_printf ("used space = %d bytes\n", msginfo.msgtql);
+		return;
+
+	case CREATOR:
+		bb_printf ("------ Message Queues: Creators/Owners --------\n");
+		bb_printf ("%-10s %-10s %-10s %-10s %-10s %-10s\n",
+		 "msqid","perms","cuid","cgid","uid","gid");
+		break;
+
+	case TIME:
+		bb_printf ("------ Message Queues Send/Recv/Change Times --------\n");
+		bb_printf ("%-8s %-10s %-20s %-20s %-20s\n",
+			"msqid","owner","send","recv","change");
+		break;
+
+	case PID:
+		bb_printf ("------ Message Queues PIDs --------\n");
+		bb_printf ("%-10s %-10s %-10s %-10s\n",
+			"msqid","owner","lspid","lrpid");
+		break;
+
+	default:
+		bb_printf ("------ Message Queues --------\n");
+		bb_printf ("%-10s %-10s %-10s %-10s %-12s %-12s\n",
+			"key", "msqid", "owner", "perms","used-bytes", "messages");
+		break;
+	}
+
+	for (id = 0; id <= maxid; id++) {
+		msqid = msgctl (id, MSG_STAT, &msgque);
+		if (msqid < 0)
+			continue;
+		if (format == CREATOR)  {
+			print_perms (msqid, ipcp);
+			continue;
+		}
+		pw = getpwuid(ipcp->uid);
+		switch (format) {
+		case TIME:
+			if (pw)
+				bb_printf ("%-8d %-10.10s", msqid, pw->pw_name);
+			else
+				bb_printf ("%-8d %-10d", msqid, ipcp->uid);
+			bb_printf (" %-20.16s", msgque.msg_stime
+				? ctime(&msgque.msg_stime) + 4 : "Not set");
+			bb_printf (" %-20.16s", msgque.msg_rtime
+				? ctime(&msgque.msg_rtime) + 4 : "Not set");
+			bb_printf (" %-20.16s\n", msgque.msg_ctime
+				? ctime(&msgque.msg_ctime) + 4 : "Not set");
+			break;
+		case PID:
+			if (pw)
+				bb_printf ("%-8d %-10.10s", msqid, pw->pw_name);
+			else
+				bb_printf ("%-8d %-10d", msqid, ipcp->uid);
+			bb_printf ("  %5d     %5d\n",
+				msgque.msg_lspid, msgque.msg_lrpid);
+			break;
+
+		default:
+				bb_printf( "0x%08x ",ipcp->KEY );
+			if (pw)
+				bb_printf ("%-10d %-10.10s", msqid, pw->pw_name);
+			else
+				bb_printf ("%-10d %-10d", msqid, ipcp->uid);
+					bb_printf (" %-10o %-12ld %-12ld\n",
+				ipcp->mode & 0777,
+				/*
+				 * glibc-2.1.3 and earlier has unsigned short;
+				 * glibc-2.1.91 has variation between
+				 * unsigned short, unsigned long
+				 * Austin has msgqnum_t
+				 */
+				(long) msgque.msg_cbytes,
+				(long) msgque.msg_qnum);
+			break;
+		}
+	}
+	return;
+}
+
+
+void print_shm (int shmid)
+{
+	struct shmid_ds shmds;
+	struct ipc_perm *ipcp = &shmds.shm_perm;
+
+	if (shmctl (shmid, IPC_STAT, &shmds) == -1) {
+		perror ("shmctl ");
+		return;
+	}
+
+	bb_printf ("\nShared memory Segment shmid=%d\n", shmid);
+	bb_printf ("uid=%d\tgid=%d\tcuid=%d\tcgid=%d\n",
+		ipcp->uid, ipcp->gid, ipcp->cuid, ipcp->cgid);
+	bb_printf ("mode=%#o\taccess_perms=%#o\n",
+		ipcp->mode, ipcp->mode & 0777);
+	bb_printf ("bytes=%ld\tlpid=%d\tcpid=%d\tnattch=%ld\n",
+		(long) shmds.shm_segsz, shmds.shm_lpid, shmds.shm_cpid,
+		(long) shmds.shm_nattch);
+	bb_printf ("att_time=%-26.24s\n",
+		shmds.shm_atime ? ctime (&shmds.shm_atime) : "Not set");
+	bb_printf ("det_time=%-26.24s\n",
+		shmds.shm_dtime ? ctime (&shmds.shm_dtime) : "Not set");
+	bb_printf ("change_time=%-26.24s\n", ctime (&shmds.shm_ctime));
+	bb_printf ("\n");
+	return;
+}
+
+
+void print_msg (int msqid)
+{
+	struct msqid_ds buf;
+	struct ipc_perm *ipcp = &buf.msg_perm;
+
+	if (msgctl (msqid, IPC_STAT, &buf) == -1) {
+		perror ("msgctl ");
+		return;
+	}
+
+	bb_printf ("\nMessage Queue msqid=%d\n", msqid);
+	bb_printf ("uid=%d\tgid=%d\tcuid=%d\tcgid=%d\tmode=%#o\n",
+		ipcp->uid, ipcp->gid, ipcp->cuid, ipcp->cgid, ipcp->mode);
+	bb_printf ("cbytes=%ld\tqbytes=%ld\tqnum=%ld\tlspid=%d\tlrpid=%d\n",
+		/*
+		 * glibc-2.1.3 and earlier has unsigned short;
+		 * glibc-2.1.91 has variation between
+		 * unsigned short, unsigned long
+		 * Austin has msgqnum_t (for msg_qbytes)
+		 */
+		(long) buf.msg_cbytes, (long) buf.msg_qbytes,
+		(long) buf.msg_qnum, buf.msg_lspid, buf.msg_lrpid);
+	bb_printf ("send_time=%-26.24s\n",
+		buf.msg_stime ? ctime (&buf.msg_stime) : "Not set");
+	bb_printf ("rcv_time=%-26.24s\n",
+		buf.msg_rtime ? ctime (&buf.msg_rtime) : "Not set");
+	bb_printf ("change_time=%-26.24s\n",
+		buf.msg_ctime ? ctime (&buf.msg_ctime) : "Not set");
+	bb_printf ("\n");
+	return;
+}
+
+void print_sem (int semid)
+{
+	struct semid_ds semds;
+	struct ipc_perm *ipcp = &semds.sem_perm;
+	union semun arg;
+	int i;
+
+	arg.buf = &semds;
+	if (semctl (semid, 0, IPC_STAT, arg) < 0) {
+		perror ("semctl ");
+		return;
+	}
+
+	bb_printf ("\nSemaphore Array semid=%d\n", semid);
+	bb_printf ("uid=%d\t gid=%d\t cuid=%d\t cgid=%d\n",
+		ipcp->uid, ipcp->gid, ipcp->cuid, ipcp->cgid);
+	bb_printf ("mode=%#o, access_perms=%#o\n",
+		ipcp->mode, ipcp->mode & 0777);
+	bb_printf ("nsems = %ld\n", (long) semds.sem_nsems);
+	bb_printf ("otime = %-26.24s\n",
+		semds.sem_otime ? ctime (&semds.sem_otime) : "Not set");
+	bb_printf ("ctime = %-26.24s\n", ctime (&semds.sem_ctime));	
+
+	bb_printf ("%-10s %-10s %-10s %-10s %-10s\n",
+		"semnum","value","ncount","zcount","pid");
+
+	arg.val = 0;
+	for (i=0; i< semds.sem_nsems; i++) {
+		int val, ncnt, zcnt, pid;
+		val = semctl (semid, i, GETVAL, arg);
+		ncnt = semctl (semid, i, GETNCNT, arg);
+		zcnt = semctl (semid, i, GETZCNT, arg);
+		pid = semctl (semid, i, GETPID, arg);
+		if (val < 0 || ncnt < 0 || zcnt < 0 || pid < 0) {
+			perror ("semctl ");
+			bb_fflush_stdout_and_exit (1);
+		}
+		bb_printf ("%-10d %-10d %-10d %-10d %-10d\n",
+			i, val, ncnt, zcnt, pid);
+	}
+	bb_printf ("\n");
+	return;
+}