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hush/util-linux/ipcs.c

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/* vi: set sw=4 ts=4: */
/*
* ipcs.c -- provides information on allocated ipc resources.
*
* 01 Sept 2004 - Rodney Radford <rradford@mindspring.com>
* Adapted for busybox from util-linux-2.12a.
*
* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
*/
#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
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);
}
static 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"
"max seg size (kbytes) = %lu\n"
"max total shared memory (pages) = %lu\n"
"min seg size (bytes) = %lu\n",
(unsigned long) shminfo.shmmni,
(unsigned long) (shminfo.shmmax >> 10),
(unsigned long) shminfo.shmall,
(unsigned long) shminfo.shmmin);
return;
case STATUS:
bb_printf ("------ Shared Memory Status --------\n"
"segments allocated %d\n"
"pages allocated %ld\n"
"pages resident %ld\n"
"pages swapped %ld\n"
"Swap performance: %ld attempts\t %ld successes\n",
shm_info.used_ids,
shm_info.shm_tot,
shm_info.shm_rss,
shm_info.shm_swp,
shm_info.swap_attempts, shm_info.swap_successes);
return;
case CREATOR:
bb_printf ("------ Shared Memory Segment Creators/Owners --------\n"
"%-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"
"%-10s %-10s %-20s %-20s %-20s\n",
"shmid","owner","attached","detached","changed");
break;
case PID:
bb_printf ("------ Shared Memory Creator/Last-op --------\n"
"%-10s %-10s %-10s %-10s\n",
"shmid","owner","cpid","lpid");
break;
default:
bb_printf ("------ Shared Memory Segments --------\n"
"%-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;
}
static 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"
"max semaphores per array = %d\n"
"max semaphores system wide = %d\n"
"max ops per semop call = %d\n"
"semaphore max value = %d\n",
seminfo.semmni,
seminfo.semmsl,
seminfo.semmns,
seminfo.semopm,
seminfo.semvmx);
return;
case STATUS:
bb_printf ("------ Semaphore Status --------\n"
"used arrays = %d\n"
"allocated semaphores = %d\n",
seminfo.semusz,
seminfo.semaem);
return;
case CREATOR:
bb_printf ("------ Semaphore Arrays Creators/Owners --------\n"
"%-10s %-10s %-10s %-10s %-10s %-10s\n",
"semid","perms","cuid","cgid","uid","gid");
break;
case TIME:
bb_printf ("------ Shared Memory Operation/Change Times --------\n"
"%-8s %-10s %-26.24s %-26.24s\n",
"shmid","owner","last-op","last-changed");
break;
case PID:
break;
default:
bb_printf ("------ Semaphore Arrays --------\n"
"%-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;
}
}
}
static 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"
"max queues system wide = %d\n"
"max size of message (bytes) = %d\n"
"default max size of queue (bytes) = %d\n",
msginfo.msgmni,
msginfo.msgmax,
msginfo.msgmnb);
return;
case STATUS:
bb_printf ("------ Messages: Status --------\n"
"allocated queues = %d\n"
"used headers = %d\n"
"used space = %d bytes\n",
msginfo.msgpool,
msginfo.msgmap,
msginfo.msgtql);
return;
case CREATOR:
bb_printf ("------ Message Queues: Creators/Owners --------\n"
"%-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"
"%-8s %-10s %-20s %-20s %-20s\n",
"msqid","owner","send","recv","change");
break;
case PID:
bb_printf ("------ Message Queues PIDs --------\n"
"%-10s %-10s %-10s %-10s\n",
"msqid","owner","lspid","lrpid");
break;
default:
bb_printf ("------ Message Queues --------\n"
"%-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;
}
static 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"
"uid=%d\tgid=%d\tcuid=%d\tcgid=%d\n"
"mode=%#o\taccess_perms=%#o\n"
"bytes=%ld\tlpid=%d\tcpid=%d\tnattch=%ld\n"
"att_time=%-26.24s\n"
"det_time=%-26.24s\n"
"change_time=%-26.24s\n"
"\n",
shmid,
ipcp->uid, ipcp->gid, ipcp->cuid, ipcp->cgid,
ipcp->mode, ipcp->mode & 0777,
(long) shmds.shm_segsz, shmds.shm_lpid, shmds.shm_cpid,
(long) shmds.shm_nattch,
shmds.shm_atime ? ctime (&shmds.shm_atime) : "Not set",
shmds.shm_dtime ? ctime (&shmds.shm_dtime) : "Not set",
ctime (&shmds.shm_ctime));
return;
}
static 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"
"uid=%d\tgid=%d\tcuid=%d\tcgid=%d\tmode=%#o\n"
"cbytes=%ld\tqbytes=%ld\tqnum=%ld\tlspid=%d\tlrpid=%d\n"
"send_time=%-26.24s\n"
"rcv_time=%-26.24s\n"
"change_time=%-26.24s\n"
"\n",
msqid,
ipcp->uid, ipcp->gid, ipcp->cuid, ipcp->cgid, ipcp->mode,
/*
* 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,
buf.msg_stime ? ctime (&buf.msg_stime) : "Not set",
buf.msg_rtime ? ctime (&buf.msg_rtime) : "Not set",
buf.msg_ctime ? ctime (&buf.msg_ctime) : "Not set");
return;
}
static void print_sem (int semid)
{
struct semid_ds semds;
struct ipc_perm *ipcp = &semds.sem_perm;
union semun arg;
unsigned int i;
arg.buf = &semds;
if (semctl (semid, 0, IPC_STAT, arg) < 0) {
perror ("semctl ");
return;
}
bb_printf ("\nSemaphore Array semid=%d\n"
"uid=%d\t gid=%d\t cuid=%d\t cgid=%d\n"
"mode=%#o, access_perms=%#o\n"
"nsems = %ld\n"
"otime = %-26.24s\n"
"ctime = %-26.24s\n"
"%-10s %-10s %-10s %-10s %-10s\n",
semid,
ipcp->uid, ipcp->gid, ipcp->cuid, ipcp->cgid,
ipcp->mode, ipcp->mode & 0777,
(long) semds.sem_nsems,
semds.sem_otime ? ctime (&semds.sem_otime) : "Not set",
ctime (&semds.sem_ctime),
"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;
}
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;
}
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