source: MondoRescue/branches/3.2/mindi-busybox/util-linux/ipcs.c

/* 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 source tree.
 */

//usage:#define ipcs_trivial_usage
//usage:       "[[-smq] -i shmid] | [[-asmq] [-tcplu]]"
//usage:#define ipcs_full_usage "\n\n"
//usage:       "    -i  Show specific resource"
//usage:     "\nResource specification:"
//usage:     "\n    -m  Shared memory segments"
//usage:     "\n    -q  Message queues"
//usage:     "\n    -s  Semaphore arrays"
//usage:     "\n    -a  All (default)"
//usage:     "\nOutput format:"
//usage:     "\n    -t  Time"
//usage:     "\n    -c  Creator"
//usage:     "\n    -p  Pid"
//usage:     "\n    -l  Limits"
//usage:     "\n    -u  Summary"

/* 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 "libbb.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;
    unsigned long shm_tot;      /* total allocated shm */
    unsigned long shm_rss;      /* total resident shm */
    unsigned long shm_swp;      /* total swapped shm */
    unsigned long swap_attempts;
    unsigned long 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 *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 char format;

static void print_perms(int id, struct ipc_perm *ipcp)
{
    struct passwd *pw;
    struct group *gr;

    printf("%-10d %-10o", id, ipcp->mode & 0777);

    pw = getpwuid(ipcp->cuid);
    if (pw) printf(" %-10s", pw->pw_name);
    else    printf(" %-10d", ipcp->cuid);
    gr = getgrgid(ipcp->cgid);
    if (gr) printf(" %-10s", gr->gr_name);
    else    printf(" %-10d", ipcp->cgid);

    pw = getpwuid(ipcp->uid);
    if (pw) printf(" %-10s", pw->pw_name);
    else    printf(" %-10d", ipcp->uid);
    gr = getgrgid(ipcp->gid);
    if (gr) printf(" %-10s\n", gr->gr_name);
    else    printf(" %-10d\n", ipcp->gid);
}


static NOINLINE void do_shm(void)
{
    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) {
        printf("kernel not configured for %s\n", "shared memory");
        return;
    }

    switch (format) {
    case LIMITS:
        printf("------ Shared Memory %s --------\n", "Limits");
        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 */
        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:
        printf("------ Shared Memory %s --------\n", "Status");
        printf("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:
        printf("------ Shared Memory %s --------\n", "Segment Creators/Owners");
        printf("%-10s %-10s %-10s %-10s %-10s %-10s\n",
                "shmid", "perms", "cuid", "cgid", "uid", "gid");
        break;

    case TIME:
        printf("------ Shared Memory %s --------\n", "Attach/Detach/Change Times");
        printf("%-10s %-10s %-20s %-20s %-20s\n",
                "shmid", "owner", "attached", "detached", "changed");
        break;

    case PID:
        printf("------ Shared Memory %s --------\n", "Creator/Last-op");
        printf("%-10s %-10s %-10s %-10s\n",
                "shmid", "owner", "cpid", "lpid");
        break;

    default:
        printf("------ Shared Memory %s --------\n", "Segments");
        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)
                printf("%-10d %-10.10s", shmid, pw->pw_name);
            else
                printf("%-10d %-10d", shmid, ipcp->uid);
            /* ctime uses static buffer: use separate calls */
            printf(" %-20.16s", shmseg.shm_atime
                    ? ctime(&shmseg.shm_atime) + 4 : "Not set");
            printf(" %-20.16s", shmseg.shm_dtime
                    ? ctime(&shmseg.shm_dtime) + 4 : "Not set");
            printf(" %-20.16s\n", shmseg.shm_ctime
                    ? ctime(&shmseg.shm_ctime) + 4 : "Not set");
            break;
        case PID:
            if (pw)
                printf("%-10d %-10.10s", shmid, pw->pw_name);
            else
                printf("%-10d %-10d", shmid, ipcp->uid);
            printf(" %-10d %-10d\n", shmseg.shm_cpid, shmseg.shm_lpid);
            break;

        default:
            printf("0x%08x ", ipcp->KEY);
            if (pw)
                printf("%-10d %-10.10s", shmid, pw->pw_name);
            else
                printf("%-10d %-10d", shmid, ipcp->uid);
            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;
        }
    }
}


static NOINLINE void do_sem(void)
{
    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 = (unsigned short *) (void *) &seminfo;
    maxid = semctl(0, 0, SEM_INFO, arg);
    if (maxid < 0) {
        printf("kernel not configured for %s\n", "semaphores");
        return;
    }

    switch (format) {
    case LIMITS:
        printf("------ Semaphore %s --------\n", "Limits");
        arg.array = (unsigned short *) (void *) &seminfo;   /* damn union */
        if ((semctl(0, 0, IPC_INFO, arg)) < 0)
            return;
        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:
        printf("------ Semaphore %s --------\n", "Status");
        printf("used arrays = %d\n"
                "allocated semaphores = %d\n",
                seminfo.semusz, seminfo.semaem);
        return;

    case CREATOR:
        printf("------ Semaphore %s --------\n", "Arrays Creators/Owners");
        printf("%-10s %-10s %-10s %-10s %-10s %-10s\n",
                "semid", "perms", "cuid", "cgid", "uid", "gid");
        break;

    case TIME:
        printf("------ Shared Memory %s --------\n", "Operation/Change Times");
        printf("%-8s %-10s %-26.24s %-26.24s\n",
                "shmid", "owner", "last-op", "last-changed");
        break;

    case PID:
        break;

    default:
        printf("------ Semaphore %s --------\n", "Arrays");
        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)
                printf("%-8d %-10.10s", semid, pw->pw_name);
            else
                printf("%-8d %-10d", semid, ipcp->uid);
            /* ctime uses static buffer: use separate calls */
            printf("  %-26.24s", semary.sem_otime
                    ? ctime(&semary.sem_otime) : "Not set");
            printf(" %-26.24s\n", semary.sem_ctime
                    ? ctime(&semary.sem_ctime) : "Not set");
            break;
        case PID:
            break;

        default:
            printf("0x%08x ", ipcp->KEY);
            if (pw)
                printf("%-10d %-10.9s", semid, pw->pw_name);
            else
                printf("%-10d %-9d", semid, ipcp->uid);
            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 NOINLINE void do_msg(void)
{
    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) {
        printf("kernel not configured for %s\n", "message queues");
        return;
    }

    switch (format) {
    case LIMITS:
        if ((msgctl(0, IPC_INFO, (struct msqid_ds *) (void *) &msginfo)) < 0)
            return;
        printf("------ Message%s --------\n", "s: Limits");
        printf("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:
        printf("------ Message%s --------\n", "s: Status");
        printf("allocated queues = %d\n"
                "used headers = %d\n"
                "used space = %d bytes\n",
                msginfo.msgpool, msginfo.msgmap, msginfo.msgtql);
        return;

    case CREATOR:
        printf("------ Message%s --------\n", " Queues: Creators/Owners");
        printf("%-10s %-10s %-10s %-10s %-10s %-10s\n",
                "msqid", "perms", "cuid", "cgid", "uid", "gid");
        break;

    case TIME:
        printf("------ Message%s --------\n", " Queues Send/Recv/Change Times");
        printf("%-8s %-10s %-20s %-20s %-20s\n",
                "msqid", "owner", "send", "recv", "change");
        break;

    case PID:
        printf("------ Message%s --------\n", " Queues PIDs");
        printf("%-10s %-10s %-10s %-10s\n",
                "msqid", "owner", "lspid", "lrpid");
        break;

    default:
        printf("------ Message%s --------\n", " Queues");
        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)
                printf("%-8d %-10.10s", msqid, pw->pw_name);
            else
                printf("%-8d %-10d", msqid, ipcp->uid);
            printf(" %-20.16s", msgque.msg_stime
                    ? ctime(&msgque.msg_stime) + 4 : "Not set");
            printf(" %-20.16s", msgque.msg_rtime
                    ? ctime(&msgque.msg_rtime) + 4 : "Not set");
            printf(" %-20.16s\n", msgque.msg_ctime
                    ? ctime(&msgque.msg_ctime) + 4 : "Not set");
            break;
        case PID:
            if (pw)
                printf("%-8d %-10.10s", msqid, pw->pw_name);
            else
                printf("%-8d %-10d", msqid, ipcp->uid);
            printf("  %5d     %5d\n", msgque.msg_lspid, msgque.msg_lrpid);
            break;

        default:
            printf("0x%08x ", ipcp->KEY);
            if (pw)
                printf("%-10d %-10.10s", msqid, pw->pw_name);
            else
                printf("%-10d %-10d", msqid, ipcp->uid);
            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;
        }
    }
}


static void print_shm(int shmid)
{
    struct shmid_ds shmds;
    struct ipc_perm *ipcp = &shmds.shm_perm;

    if (shmctl(shmid, IPC_STAT, &shmds) == -1) {
        bb_perror_msg("shmctl");
        return;
    }

    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",
            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);
    printf("att_time=%-26.24s\n",
            shmds.shm_atime ? ctime(&shmds.shm_atime) : "Not set");
    printf("det_time=%-26.24s\n",
            shmds.shm_dtime ? ctime(&shmds.shm_dtime) : "Not set");
    printf("change_time=%-26.24s\n\n", ctime(&shmds.shm_ctime));
}


static void print_msg(int msqid)
{
    struct msqid_ds buf;
    struct ipc_perm *ipcp = &buf.msg_perm;

    if (msgctl(msqid, IPC_STAT, &buf) == -1) {
        bb_perror_msg("msgctl");
        return;
    }

    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",
            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);

    printf("send_time=%-26.24s\n",
            buf.msg_stime ? ctime(&buf.msg_stime) : "Not set");
    printf("rcv_time=%-26.24s\n",
            buf.msg_rtime ? ctime(&buf.msg_rtime) : "Not set");
    printf("change_time=%-26.24s\n\n",
            buf.msg_ctime ? ctime(&buf.msg_ctime) : "Not set");
}

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)) {
        bb_perror_msg("semctl");
        return;
    }

    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",
            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");
    printf("ctime = %-26.24s\n"
            "%-10s %-10s %-10s %-10s %-10s\n",
            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) {
            bb_perror_msg_and_die("semctl");
        }
        printf("%-10d %-10d %-10d %-10d %-10d\n", i, val, ncnt, zcnt, pid);
    }
    bb_putchar('\n');
}

int ipcs_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int ipcs_main(int argc UNUSED_PARAM, char **argv)
{
    int id = 0;
    unsigned flags = 0;
    unsigned opt;
    char *opt_i;
#define flag_print  (1<<0)
#define flag_msg    (1<<1)
#define flag_sem    (1<<2)
#define flag_shm    (1<<3)

    opt = getopt32(argv, "i:aqsmtcplu", &opt_i);
    if (opt & 0x1) { // -i
        id = xatoi(opt_i);
        flags |= flag_print;
    }
    if (opt & 0x2) flags |= flag_msg | flag_sem | flag_shm; // -a
    if (opt & 0x4) flags |= flag_msg; // -q
    if (opt & 0x8) flags |= flag_sem; // -s
    if (opt & 0x10) flags |= flag_shm; // -m
    if (opt & 0x20) format = TIME; // -t
    if (opt & 0x40) format = CREATOR; // -c
    if (opt & 0x80) format = PID; // -p
    if (opt & 0x100) format = LIMITS; // -l
    if (opt & 0x200) format = STATUS; // -u

    if (flags & flag_print) {
        if (flags & flag_shm) {
            print_shm(id);
            fflush_stdout_and_exit(EXIT_SUCCESS);
        }
        if (flags & flag_sem) {
            print_sem(id);
            fflush_stdout_and_exit(EXIT_SUCCESS);
        }
        if (flags & flag_msg) {
            print_msg(id);
            fflush_stdout_and_exit(EXIT_SUCCESS);
        }
        bb_show_usage();
    }

    if (!(flags & (flag_shm | flag_msg | flag_sem)))
        flags |= flag_msg | flag_shm | flag_sem;
    bb_putchar('\n');

    if (flags & flag_shm) {
        do_shm();
        bb_putchar('\n');
    }
    if (flags & flag_sem) {
        do_sem();
        bb_putchar('\n');
    }
    if (flags & flag_msg) {
        do_msg();
        bb_putchar('\n');
    }
    fflush_stdout_and_exit(EXIT_SUCCESS);
}