busybox

/* vi: set sw=4 ts=4: */

/*

 * 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.

 *

 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.

 */

​

#include "libbb.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() */

#include <sys/ipc.h>

#include <sys/shm.h>

#include <sys/msg.h>

#include <sys/sem.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 *array;

    struct seminfo *__buf;

};

#endif

​

#define IPCRM_LEGACY 1

​

​

#if IPCRM_LEGACY

​

typedef enum type_id {

    SHM,

    SEM,

    MSG

} type_id;

​

static int remove_ids(type_id type, int argc, char **argv)

{

    unsigned long id;

    int ret = 0;        /* silence gcc */

    int nb_errors = 0;

    union semun arg;

​

    arg.val = 0;

​

    while (argc) {

        id = bb_strtoul(argv[0], NULL, 10);

        if (errno || id > INT_MAX) {

            bb_error_msg("invalid id: %s", argv[0]);

            nb_errors++;

        } else {

            if (type == SEM)

                ret = semctl(id, 0, IPC_RMID, arg);

            else if (type == MSG)

                ret = msgctl(id, IPC_RMID, NULL);

            else if (type ==  SHM)

                ret = shmctl(id, IPC_RMID, NULL);