Method shmctl

source/kernel/ksystem.cpp:665–712

                           message sizes, etc. */

U32 KSystem::shmctl(KThread* thread, U32 shmid, U32 cmd, U32 buf) {
    std::shared_ptr<SHM> shm;
    KMemory* memory = thread->memory;

    if (shmid & PRIVATE_SHMID) {
        shm = thread->process->getSHM(shmid);
    } else {
        shm = publicShm[shmid];
    }

    if (!shm) {
        return -K_EINVAL;
    }
    if (cmd & IPC_64) {
        cmd &= ~IPC_64;
    }
    if (cmd == IPC_RMID) {
        shm->markedForDelete = 1;
    }
    if (!buf)
        return -K_EFAULT;
    if (cmd == IPC_STAT) {
        // ipc_perm
        memory->writed(buf, shm->key); buf+=4;
        memory->writed(buf, shm->cuid); buf += 4;
        memory->writed(buf, shm->cgid); buf += 4;
        memory->writed(buf, shm->cuid); buf += 4;
        memory->writed(buf, shm->cgid); buf += 4;
        memory->writew(buf, 0777); buf += 2;
        memory->writew(buf, 0); buf += 2;
        memory->writew(buf, shmid); buf += 2;
        memory->writew(buf, 0); buf += 2;
        memory->writed(buf, 0); buf += 4;
        memory->writed(buf, 0); buf += 4;
        memory->writed(buf, shm->len); buf += 4;
        memory->writed(buf, (U32)(shm->atime / 1000000)); buf += 4;
        memory->writed(buf, (U32)(shm->dtime / 1000000)); buf += 4;
        memory->writed(buf, (U32)(shm->ctime / 1000000)); buf += 4;
        memory->writed(buf, shm->cpid); buf += 4;
        memory->writed(buf, shm->lpid); buf += 4;
        memory->writew(buf, shm->nattch); buf += 2;
        memory->writew(buf, 0); buf += 2;
        memory->writed(buf, 0);
    } else {
        kpanic_fmt("Unknown syscall_shmctl cmd=%X", cmd);
    }
    return 0;
}

#define K_RLIM_INFINITY 0xFFFFFFFF