text:
/*
 *  'fork.c' contains the help-routines for the 'fork' system call
 * (see also entry.S and others).
 * Fork is rather simple, once you get the hang of it, but the memory
 * management can be a bitch. See 'mm/memory.c': 'copy_page_range()'
 */

#include <linux/slab.h>
#include <linux/init.h>
#include <linux/unistd.h>
#include <linux/smp_lock.h>
#include <linux/module.h>
#include <linux/vmalloc.h>
#include <linux/completion.h>
#include <linux/mnt_namespace.h>
#include <linux/personality.h>
#include <linux/mempolicy.h>
#include <linux/sem.h>
#include <linux/file.h>
#include <linux/key.h>
#include <linux/binfmts.h>
#include <linux/mman.h>
#include <linux/fs.h>
#include <linux/nsproxy.h>
#include <linux/capability.h>
#include <linux/cpu.h>
#include <linux/cpuset.h>
#include <linux/security.h>
#include <linux/swap.h>
#include <linux/syscalls.h>
#include <linux/jiffies.h>
#include <linux/futex.h>
#include <linux/task_io_accounting_ops.h>
#include <linux/rcupdate.h>
#include <linux/ptrace.h>
#include <linux/mount.h>
#include <linux/audit.h>
#include <linux/profile.h>
#include <linux/rmap.h>
#include <linux/acct.h>
#include <linux/tsacct_kern.h>
#include <linux/cn_proc.h>
#include <linux/delayacct.h>
#include <linux/taskstats_kern.h>
#include <linux/random.h>

#include <asm/pgtable.h>
#include <asm/pgalloc.h>
#include <asm/uaccess.h>
#include <asm/mmu_context.h>
#include <asm/cacheflush.h>
#include <asm/tlbflush.h>

/*
 * Protected counters by write_lock_irq(&tasklist_lock)
 */
unsigned long total_forks;	/* Handle normal Linux uptimes. */
int nr_threads; 		/* The idle threads do not count.. */

int max_threads;		/* tunable limit on nr_threads */

DEFINE_PER_CPU(unsigned long, process_counts) = 0;

__cacheline_aligned DEFINE_RWLOCK(tasklist_lock);  /* outer */

int nr_processes(void)
{
	int cpu;
	int total = 0;

	for_each_online_cpu(cpu)
		total += per_cpu(process_counts, cpu);

	return total;
}

#ifndef __HAVE_ARCH_TASK_STRUCT_ALLOCATOR
# define alloc_task_struct()	kmem_cache_alloc(task_struct_cachep, GFP_KERNEL)
# define free_task_struct(tsk)	kmem_cache_free(task_struct_cachep, (tsk))
static struct kmem_cache *task_struct_cachep;
#endif

/* SLAB cache for signal_struct structures (tsk->signal) */
static struct kmem_cache *signal_cachep;

/* SLAB cache for sighand_struct structures (tsk->sighand) */
struct kmem_cache *sighand_cachep;

/* SLAB cache for files_struct structures (tsk->files) */
struct kmem_cache *files_cachep;

/* SLAB cache for fs_struct structures (tsk->fs) */
struct kmem_cache *fs_cachep;

/* SLAB cache for vm_area_struct structures */
struct kmem_cache *vm_area_cachep;

/* SLAB cache for mm_struct structures (tsk->mm) */
static struct kmem_cache *mm_cachep;

void free_task(struct task_struct *tsk)
{
	free_thread_info(tsk->thread_info);
	rt_mutex_debug_task_free(tsk);
	free_task_struct(tsk);
}
EXPORT_SYMBOL(free_task);

void __put_task_struct(struct task_struct *tsk)
{
	WARN_ON(!(tsk->exit_state & (EXIT_DEAD | EXIT_ZOMBIE)));
	WARN_ON(atomic_read(&tsk->usage));
	WARN_ON(tsk == current);

	security_task_free(tsk);
	free_uid(tsk->user);
	put_group_info(tsk->group_info);
	delayacct_tsk_free(tsk);

	if (!profile_handoff_task(tsk))
		free_task(tsk);
}

void __init fork_init(unsigned long mempages)
{
#ifndef __HAVE_ARCH_TASK_STRUCT_ALLOCATOR
#ifndef ARCH_MIN_TASKALIGN
#define ARCH_MIN_TASKALIGN	L1_CACHE_BYTES
#endif
	/* create a slab on which task_structs can be allocated */
	task_struct_cachep =
		kmem_cache_create("task_struct", sizeof(struct task_struct),
			ARCH_MIN_TASKALIGN, SLAB_PANIC, NULL, NULL);
#endif

	/*
	 * The default maximum number of threads is set to a safe
	 * value: the thread structures can take up at most half
	 * of memory.
	 */
	max_threads = mempages / (8 * THREAD_SIZE / PAGE_SIZE);

	/*
	 * we need to allow at least 20 threads to boot a system
	 */
	if(max_threads < 20)
		max_threads = 20;

	init_task.signal->rlim[RLIMIT_NPROC].rlim_cur = max_threads/2;
	init_task.signal->rlim[RLIMIT_NPROC].rlim_max = max_threads/2;
	init_task.signal->rlim[RLIMIT_SIGPENDING] =
		init_task.signal->rlim[RLIMIT_NPROC];
}

static struct task_struct *dup_task_struct(struct task_struct *orig)
{
	struct task_struct *tsk;
	struct thread_info *ti;

	prepare_to_copy(orig);

	tsk = alloc_task_struct();
	if (!tsk)
		return NULL;

	ti = alloc_thread_info(tsk);
	if (!ti) {
		free_task_struct(tsk);
		return NULL;
	}

	*tsk = *orig;
	tsk->thread_info = ti;
	setup_thread_stack(tsk, orig);

#ifdef CONFIG_CC_STACKPROTECTOR
	tsk->stack_canary = get_random_int();
#endif

	/* One for us, one for whoever does the "release_task()" (usually parent) */
	atomic_set(&tsk->usage,2);
	atomic_set(&tsk->fs_excl, 0);
#ifdef CONFIG_BLK_DEV_IO_TRACE
	tsk->btrace_seq = 0;
#endif
	tsk->splice_pipe = NULL;
	return tsk;
}

#ifdef CONFIG_MMU
static inline int dup_mmap(struct mm_struct *mm, struct mm_struct *oldmm)
{
	struct vm_area_struct *mpnt, *tmp, **pprev;
	struct rb_node **rb_link, *rb_parent;
	int retval;
	unsigned long charge;
	struct mempolicy *pol;

	down_write(&oldmm->mmap_sem);
	flush_cache_dup_mm(oldmm);
	/*
	 * Not linked in yet - no deadlock potential:
	 */
	down_write_nested(&mm->mmap_sem, SINGLE_DEPTH_NESTING);

	mm->locked_vm = 0;
	mm->mmap = NULL;
	mm->mmap_cache = NULL;
	mm->free_area_cache = oldmm->mmap_base;
	mm->cached_hole_size = ~0UL;
	mm->map_count = 0;
	cpus_clear(mm->cpu_vm_mask);
	mm->mm_rb = RB_ROOT;
	rb_link = &mm->mm_rb.rb_node;
	rb_parent = NULL;
	pprev = &mm->mmap;

	for (mpnt = oldmm->mmap; mpnt; mpnt = mpnt->vm_next) {
		struct file *file;

		if (mpnt->vm_flags & VM_DONTCOPY) {
			long pages = vma_pages(mpnt);
			mm->total_vm -= pages;
			vm_stat_account(mm, mpnt->vm_flags, mpnt->vm_file,
								-pages);
			continue;
		}
		charge = 0;
		if (mpnt->vm_flags & VM_ACCOUNT) {
			unsigned int len = (mpnt->vm_end - mpnt->vm_start) >> PAGE_SHIFT;
			if (security_vm_enough_memory(len))
				goto fail_nomem;
			charge = len;
		}
		tmp = kmem_cache_alloc(vm_area_cachep, GFP_KERNEL);
		if (!tmp)
			goto fail_nomem;
		*tmp = *mpnt;
		pol = mpol_copy(vma_policy(mpnt));
		retval = PTR_ERR(pol);
		if (IS_ERR(pol))
			goto fail_nomem_policy;
		vma_set_policy(tmp, pol);
		tmp->vm_flags &= ~VM_LOCKED;
		tmp->vm_mm = mm;
		tmp->vm_next = NULL;
		anon_vma_link(tmp);
		file = tmp->vm_file;
		if (file) {
			struct inode *inode = file->f_path.dentry->d_inode;
			get_file(file);
			if (tmp->vm_flags & VM_DENYWRITE)
				atomic_dec(&inode->i_writecount);

			/* insert tmp into the share list, just after mpnt */
			spin_lock(&file->f_mapping->i_mmap_lock);
			tmp->vm_truncate_count = mpnt->vm_truncate_count;
			flush_dcache_mmap_lock(file->f_mapping);
			vma_prio_tree_add(tmp, mpnt);
			flush_dcache_mmap_unlock(file->f_mapping);
			spin_unlock(&file->f_mapping->i_mmap_lock);
		}

		/*
		 * Link in the new vma and copy the page table entries.
		 */
		*pprev = tmp;
		pprev = &tmp->vm_next;

		__vma_link_rb(mm, tmp, rb_link, rb_parent);
		rb_link = &tmp->vm_rb.rb_right;
		rb_parent = &tmp->vm_rb;

		mm->map_count++;
		retval = copy_page_range(mm, oldmm, mpnt);

		if (tmp->vm_ops && tmp->vm_ops->open)
			tmp->vm_ops->open(tmp);

		if (retval)
			goto out;
	}
	retval = 0;
out:
	up_write(&mm->mmap_sem);
	flush_tlb_mm(oldmm);
	up_write(&oldmm->mmap_sem);
	return retval;
fail_nomem_policy:
	kmem_cache_free(vm_area_cachep, tmp);
fail_nomem:
	retval = -ENOMEM;
	vm_unacct_memory(charge);
	goto out;
}

static inline int mm_alloc_pgd(struct mm_struct * mm)
{
	mm->pgd = pgd_alloc(mm);
	if (unlikely(!mm->pgd))
		return -ENOMEM;
	return 0;
}

static inline void mm_free_pgd(struct mm_struct * mm)
{
	pgd_free(mm->pgd);
}
#else
#define dup_mmap(mm, oldmm)	(0)
#define mm_alloc_pgd(mm)	(0)
#define mm_free_pgd(mm)
#endif /* CONFIG_MMU */

 __cacheline_aligned_in_smp DEFINE_SPINLOCK(mmlist_lock);

#define allocate_mm()	(kmem_cache_alloc(mm_cachep, GFP_KERNEL))
#define free_mm(mm)	(kmem_cache_free(mm_cachep, (mm)))

#include <linux/init_task.h>

static struct mm_struct * mm_init(struct mm_struct * mm)
{
	atomic_set(&mm->mm_users, 1);
	atomic_set(&mm->mm_count, 1);
	init_rwsem(&mm->mmap_sem);
	INIT_LIST_HEAD(&mm->mmlist);
	mm->core_waiters = 0;
	mm->nr_ptes = 0;
	set_mm_counter(mm, file_rss, 0);
	set_mm_counter(mm, anon_rss, 0);
	spin_lock_init(&mm->page_table_lock);
	rwlock_init(&mm->ioctx_list_lock);
	mm->ioctx_list = NULL;
	mm->free_area_cache = TASK_UNMAPPED_BASE;
	mm->cached_hole_size = ~0UL;

	if (likely(!mm_alloc_pgd(mm))) {
		mm->def_flags = 0;
		return mm;
	}
	free_mm(mm);
	return NULL;
}

/*
 * Allocate and initialize an mm_struct.
 */
struct mm_struct * mm_alloc(void)
{
	struct mm_struct * mm;

	mm = allocate_mm();
	if (mm) {
		memset(mm, 0, sizeof(*mm));
		mm = mm_init(mm);
	}
	return mm;
}

/*
 * Called when the last reference to the mm
 * is dropped: either by a lazy thread or by
 * mmput. Free the page directory and the mm.
 */
void fastcall __mmdrop(struct mm_struct *mm)
{
	BUG_ON(mm == &init_mm);
	mm_free_pgd(mm);
	destroy_context(mm);
	free_mm(mm);
}

/*
 * Decrement the use count and release all resources for an mm.
 */
void mmput(struct mm_struct *mm)
{
	might_sleep();

	if (atomic_dec_and_test(&mm->mm_users)) {
		exit_aio(mm);
		exit_mmap(mm);
		if (!list_empty(&mm->mmlist)) {
			spin_lock(&mmlist_lock);
			list_del(&mm->mmlist);
			spin_unlock(&mmlist_lock);
		}
		put_swap_token(mm);
		mmdrop(mm);
	}
}
EXPORT_SYMBOL_GPL(mmput);

/**
 * get_task_mm - acquire a reference to the task's mm
 *
 * Returns %NULL if the task has no mm.  Checks PF_BORROWED_MM (meaning
 * this kernel workthread has transiently adopted a user mm with use_mm,
 * to do its AIO) is not set and if so returns a reference to it, after
 * bumping up the use count.  User must release the mm via mmput()
 * after use.  Typically used by /proc and ptrace.
 */
struct mm_struct *get_task_mm(struct task_struct *task)
{
	struct mm_struct *mm;

	task_lock(task);
	mm = task->mm;
	if (mm) {
		if (task->flags & PF_BORROWED_MM)
			mm = NULL;
		else
			atomic_inc(&mm->mm_users);
	}
	task_unlock(task);
	return mm;
}
EXPORT_SYMBOL_GPL(get_task_mm);

/* Please note the differences between mmput and mm_release.
 * mmput is called whenever we stop holding onto a mm_struct,
 * error success whatever.
 *
 * mm_release is called after a mm_struct has been removed
 * from the current process.
 *
 * This difference is important for error handling, when we
 * only half set up a mm_struct for a new process and need to restore
 * the old one.  Because we mmput the new mm_struct before
 * restoring the old one. . .
 * Eric Biederman 10 January 1998
 */
void mm_release(struct task_struct *tsk, struct mm_struct *mm)
{
	struct completion *vfork_done = tsk->vfork_done;

	/* Get rid of any cached register state */
	deactivate_mm(tsk, mm);

	/* notify parent sleeping on vfork() */
	if (vfork_done) {
		tsk->vfork_done = NULL;
		complete(vfork_done);
	}

	/*
	 * If we're exiting normally, clear a user-space tid field if
	 * requested.  We leave this alone when dying by signal, to leave
	 * the value intact in a core dump, and to save the unnecessary
	 * trouble otherwise.  Userland only wants this done for a sys_exit.
	 */
	if (tsk->clear_child_tid
	    && !(tsk->flags & PF_SIGNALED)
	    && atomic_read(&mm->mm_users) > 1) {
		u32 __user * tidptr = tsk->clear_child_tid;
		tsk->clear_child_tid = NULL;

		/*
		 * We don't check the error code - if userspace has
		 * not set up a proper pointer then tough luck.
		 */
		put_user(0, tidptr);
		sys_futex(tidptr, FUTEX_WAKE, 1, NULL, NULL, 0);
	}
}

/*
 * Allocate a new mm structure and copy contents from the
 * mm structure of the passed in task structure.
 */
static struct mm_struct *dup_mm(struct task_struct *tsk)
{
	struct mm_struct *mm, *oldmm = current->mm;
	int err;

	if (!oldmm)
		return NULL;

	mm = allocate_mm();
	if (!mm)
		goto fail_nomem;

	memcpy(mm, oldmm, sizeof(*mm));

	/* Initializing for Swap token stuff */
	mm->token_priority = 0;
	mm->last_interval = 0;

	if (!mm_init(mm))
		goto fail_nomem;

	if (init_new_context(tsk, mm))
		goto fail_nocontext;

	err = dup_mmap(mm, oldmm);
	if (err)
		goto free_pt;

	mm->hiwater_rss = get_mm_rss(mm);
	mm->hiwater_vm = mm->total_vm;

	return mm;

free_pt:
	mmput(mm);

fail_nomem:
	return NULL;

fail_nocontext:
	/*
	 * If init_new_context() failed, we cannot use mmput() to free the mm
	 * because it calls destroy_context()
	 */
	mm_free_pgd(mm);
	free_mm(mm);
	return NULL;
}

static int copy_mm(unsigned long clone_flags, struct task_struct * tsk)
{
	struct mm_struct * mm, *oldmm;
	int retval;

	tsk->min_flt = tsk->maj_flt = 0;
	tsk->nvcsw = tsk->nivcsw = 0;

	tsk->mm = NULL;
	tsk->active_mm = NULL;

	/*
	 * Are we cloning a kernel thread?
	 *
	 * We need to steal a active VM for that..
	 */
	oldmm = current->mm;
	if (!oldmm)
		return 0;

	if (clone_flags & CLONE_VM) {
		atomic_inc(&oldmm->mm_users);
		mm = oldmm;
		goto good_mm;
	}

	retval = -ENOMEM;
	mm = dup_mm(tsk);
	if (!mm)
		goto fail_nomem;

good_mm:
	/* Initializing for Swap token stuff */
	mm->token_priority = 0;
	mm->last_interval = 0;

	tsk->mm = mm;
	tsk->active_mm = mm;
	return 0;

fail_nomem:
	return retval;
}

static inline struct fs_struct *__copy_fs_struct(struct fs_struct *old)
{
	struct fs_struct *fs = kmem_cache_alloc(fs_cachep, GFP_KERNEL);
	/* We don't need to lock fs - think why ;-) */
	if (fs) {
		atomic_set(&fs->count, 1);
		rwlock_init(&fs->lock);
		fs->umask = old->umask;
		read_lock(&old->lock);
		fs->rootmnt = mntget(old->rootmnt);
		fs->root = dget(old->root);
		fs->pwdmnt = mntget(old->pwdmnt);
		fs->pwd = dget(old->pwd);
		if (old->altroot) {
			fs->altrootmnt = mntget(old->altrootmnt);
			fs->altroot = dget(old->altroot);
		} else {
			fs->altrootmnt = NULL;
			fs->altroot = NULL;
		}
		read_unlock(&old->lock);
	}
	return fs;
}

struct fs_struct *copy_fs_struct(struct fs_struct *old)
{
	return __copy_fs_struct(old);
}

EXPORT_SYMBOL_GPL(copy_fs_struct);

static inline int copy_fs(unsigned long clone_flags, struct task_struct * tsk)
{
	if (clone_flags & CLONE_FS) {
		atomic_inc(&current->fs->count);
		return 0;
	}
	tsk->fs = __copy_fs_struct(current->fs);
	if (!tsk->fs)
		return -ENOMEM;
	return 0;
}

static int count_open_files(struct fdtable *fdt)
{
	int size = fdt->max_fds;
	int i;

	/* Find the last open fd */
	for (i = size/(8*sizeof(long)); i > 0; ) {
		if (fdt->open_fds->fds_bits[--i])
			break;
	}
	i = (i+1) * 8 * sizeof(long);
	return i;
}

static struct files_struct *alloc_files(void)
{
	struct files_struct *newf;
	struct fdtable *fdt;

	newf = kmem_cache_alloc(files_cachep, GFP_KERNEL);
	if (!newf)
		goto out;

	atomic_set(&newf->count, 1);

	spin_lock_init(&newf->file_lock);
	newf->next_fd = 0;
	fdt = &newf->fdtab;
	fdt->max_fds = NR_OPEN_DEFAULT;
	fdt->close_on_exec = (fd_set *)&newf->close_on_exec_init;
	fdt->open_fds = (fd_set *)&newf->open_fds_init;
	fdt->fd = &newf->fd_array[0];
	INIT_RCU_HEAD(&fdt->rcu);
	fdt->next = NULL;
	rcu_assign_pointer(newf->fdt, fdt);
out:
	return newf;
}

/*
 * Allocate a new files structure and copy contents from the
 * passed in files structure.
 * errorp will be valid only when the returned files_struct is NULL.
 */
static struct files_struct *dup_fd(struct files_struct *oldf, int *errorp)
{
	struct files_struct *newf;
	struct file **old_fds, **new_fds;
	int open_files, size, i;
	struct fdtable *old_fdt, *new_fdt;

	*errorp = -ENOMEM;
	newf = alloc_files();
	if (!newf)
		goto out;

	spin_lock(&oldf->file_lock);
	old_fdt = files_fdtable(oldf);
	new_fdt = files_fdtable(newf);
	open_files = count_open_files(old_fdt);

	/*
	 * Check whether we need to allocate a larger fd array and fd set.
	 * Note: we're not a clone task, so the open count won't change.
	 */
	if (open_files > new_fdt->max_fds) {
		new_fdt->max_fds = 0;
		spin_unlock(&oldf->file_lock);
		spin_lock(&newf->file_lock);
		*errorp = expand_files(newf, open_files-1);
		spin_unlock(&newf->file_lock);
		if (*errorp < 0)
			goto out_release;
		new_fdt = files_fdtable(newf);
		/*
		 * Reacquire the oldf lock and a pointer to its fd table
		 * who knows it may have a new bigger fd table. We need
		 * the latest pointer.
		 */
		spin_lock(&oldf->file_lock);
		old_fdt = files_fdtable(oldf);
	}

	old_fds = old_fdt->fd;
	new_fds = new_fdt->fd;

	memcpy(new_fdt->open_fds->fds_bits,
		old_fdt->open_fds->fds_bits, open_files/8);
	memcpy(new_fdt->close_on_exec->fds_bits,
		old_fdt->close_on_exec->fds_bits, open_files/8);

	for (i = open_files; i != 0; i--) {
		struct file *f = *old_fds++;
		if (f) {
			get_file(f);
		} else {
			/*
			 * The fd may be claimed in the fd bitmap but not yet
			 * instantiated in the files array if a sibling thread
			 * is partway through open().  So make sure that this
			 * fd is available to the new process.
			 */
			FD_CLR(open_files - i, new_fdt->open_fds);
		}
		rcu_assign_pointer(*new_fds++, f);
	}
	spin_unlock(&oldf->file_lock);

	/* compute the remainder to be cleared */
	size = (new_fdt->max_fds - open_files) * sizeof(struct file *);

	/* This is long word aligned thus could use a optimized version */
	memset(new_fds, 0, size);

	if (new_fdt->max_fds > open_files) {
		int left = (new_fdt->max_fds-open_files)/8;
		int start = open_files / (8 * sizeof(unsigned long));

		memset(&new_fdt->open_fds->fds_bits[start], 0, left);
		memset(&new_fdt->close_on_exec->fds_bits[start], 0, left);
	}

	return newf;

out_release:
	kmem_cache_free(files_cachep, newf);
out:
	return NULL;
}

static int copy_files(unsigned long clone_flags, struct task_struct * tsk)
{
	struct files_struct *oldf, *newf;
	int error = 0;

	/*
	 * A background process may not have any files ...
	 */
	oldf = current->files;
	if (!oldf)
		goto out;

	if (clone_flags & CLONE_FILES) {
		atomic_inc(&oldf->count);
		goto out;
	}

	/*
	 * Note: we may be using current for both targets (See exec.c)
	 * This works because we cache current->files (old) as oldf. Don't
	 * break this.
	 */
	tsk->files = NULL;
	newf = dup_fd(oldf, &error);
	if (!newf)
		goto out;

	tsk->files = newf;
	error = 0;
out:
	return error;
}

/*
 *	Helper to unshare the files of the current task.
 *	We don't want to expose copy_files internals to
 *	the exec layer of the kernel.
 */

int unshare_files(void)
{
	struct files_struct *files  = current->files;
	int rc;

	BUG_ON(!files);

	/* This can race but the race causes us to copy when we don't
	   need to and drop the copy */
	if(atomic_read(&files->count) == 1)
	{
		atomic_inc(&files->count);
		return 0;
	}
	rc = copy_files(0, current);
	if(rc)
		current->files = files;
	return rc;
}

EXPORT_SYMBOL(unshare_files);

static inline int copy_sighand(unsigned long clone_flags, struct task_struct * tsk)
{
	struct sighand_struct *sig;

	if (clone_flags & (CLONE_SIGHAND | CLONE_THREAD)) {
		atomic_inc(&current->sighand->count);
		return 0;
	}
	sig = kmem_cache_alloc(sighand_cachep, GFP_KERNEL);
	rcu_assign_pointer(tsk->sighand, sig);
	if (!sig)
		return -ENOMEM;
	atomic_set(&sig->count, 1);
	memcpy(sig->action, current->sighand->action, sizeof(sig->action));
	return 0;
}

void __cleanup_sighand(struct sighand_struct *sighand)
{
	if (atomic_dec_and_test(&sighand->count))
		kmem_cache_free(sighand_cachep, sighand);
}

static inline int copy_signal(unsigned long clone_flags, struct task_struct * tsk)
{
	struct signal_struct *sig;
	int ret;

	if (clone_flags & CLONE_THREAD) {
		atomic_inc(&current->signal->count);
		atomic_inc(&current->signal->live);
		return 0;
	}
	sig = kmem_cache_alloc(signal_cachep, GFP_KERNEL);
	tsk->signal = sig;
	if (!sig)
		return -ENOMEM;

	ret = copy_thread_group_keys(tsk);
	if (ret < 0) {
		kmem_cache_free(signal_cachep, sig);
		return ret;
	}

	atomic_set(&sig->count, 1);
	atomic_set(&sig->live, 1);
	init_waitqueue_head(&sig->wait_chldexit);
	sig->flags = 0;
	sig->group_exit_code = 0;
	sig->group_exit_task = NULL;
	sig->group_stop_count = 0;
	sig->curr_target = NULL;
	init_sigpending(&sig->shared_pending);
	INIT_LIST_HEAD(&sig->posix_timers);

	hrtimer_init(&sig->real_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
	sig->it_real_incr.tv64 = 0;
	sig->real_timer.function = it_real_fn;
	sig->tsk = tsk;

	sig->it_virt_expires = cputime_zero;
	sig->it_virt_incr = cputime_zero;
	sig->it_prof_expires = cputime_zero;
	sig->it_prof_incr = cputime_zero;

	sig->leader = 0;	/* session leadership doesn't inherit */
	sig->tty_old_pgrp = NULL;

	sig->utime = sig->stime = sig->cutime = sig->cstime = cputime_zero;
	sig->nvcsw = sig->nivcsw = sig->cnvcsw = sig->cnivcsw = 0;
	sig->min_flt = sig->maj_flt = sig->cmin_flt = sig->cmaj_flt = 0;
	sig->sched_time = 0;
	INIT_LIST_HEAD(&sig->cpu_timers[0]);
	INIT_LIST_HEAD(&sig->cpu_timers[1]);
	INIT_LIST_HEAD(&sig->cpu_timers[2]);
	taskstats_tgid_init(sig);

	task_lock(current->group_leader);
	memcpy(sig->rlim, current->signal->rlim, sizeof sig->rlim);
	task_unlock(current->group_leader);

	if (sig->rlim[RLIMIT_CPU].rlim_cur != RLIM_INFINITY) {
		/*
		 * New sole thread in the process gets an expiry time
		 * of the whole CPU time limit.
		 */
		tsk->it_prof_expires =
			secs_to_cputime(sig->rlim[RLIMIT_CPU].rlim_cur);
	}
	acct_init_pacct(&sig->pacct);

	return 0;
}

void __cleanup_signal(struct signal_struct *sig)
{
	exit_thread_group_keys(sig);
	kmem_cache_free(signal_cachep, sig);
}

static inline void cleanup_signal(struct task_struct *tsk)
{
	struct signal_struct *sig = tsk->signal;

	atomic_dec(&sig->live);

	if (atomic_dec_and_test(&sig->count))
		__cleanup_signal(sig);
}

static inline void copy_flags(unsigned long clone_flags, struct task_struct *p)
{
	unsigned long new_flags = p->flags;

	new_flags &= ~(PF_SUPERPRIV | PF_NOFREEZE);
	new_flags |= PF_FORKNOEXEC;
	if (!(clone_flags & CLONE_PTRACE))
		p->ptrace = 0;
	p->flags = new_flags;
}

asmlinkage long sys_set_tid_address(int __user *tidptr)
{
	current->clear_child_tid = tidptr;

	return current->pid;
}

static inline void rt_mutex_init_task(struct task_struct *p)
{
	spin_lock_init(&p->pi_lock);
#ifdef CONFIG_RT_MUTEXES
	plist_head_init(&p->pi_waiters, &p->pi_lock);
	p->pi_blocked_on = NULL;
#endif
}

/*
 * This creates a new process as a copy of the old one,
 * but does not actually start it yet.
 *
 * It copies the registers, and all the appropriate
 * parts of the process environment (as per the clone
 * flags). The actual kick-off is left to the caller.
 */
static struct task_struct *copy_process(unsigned long clone_flags,
					unsigned long stack_start,
					struct pt_regs *regs,
					unsigned long stack_size,
					int __user *parent_tidptr,
					int __user *child_tidptr,
					int pid)
{
	int retval;
	struct task_struct *p = NULL;

	if ((clone_flags & (CLONE_NEWNS|CLONE_FS)) == (CLONE_NEWNS|CLONE_FS))
		return ERR_PTR(-EINVAL);

	/*
	 * Thread groups must share signals as well, and detached threads
	 * can only be started up within the thread group.
	 */
	if ((clone_flags & CLONE_THREAD) && !(clone_flags & CLONE_SIGHAND))
		return ERR_PTR(-EINVAL);

	/*
	 * Shared signal handlers imply shared VM. By way of the above,
	 * thread groups also imply shared VM. Blocking this case allows
	 * for various simplifications in other code.
	 */
	if ((clone_flags & CLONE_SIGHAND) && !(clone_flags & CLONE_VM))
		return ERR_PTR(-EINVAL);

	retval = security_task_create(clone_flags);
	if (retval)
		goto fork_out;

	retval = -ENOMEM;
	p = dup_task_struct(current);
	if (!p)
		goto fork_out;

	rt_mutex_init_task(p);

#ifdef CONFIG_TRACE_IRQFLAGS
	DEBUG_LOCKS_WARN_ON(!p->hardirqs_enabled);
	DEBUG_LOCKS_WARN_ON(!p->softirqs_enabled);
#endif
	retval = -EAGAIN;
	if (atomic_read(&p->user->processes) >=
			p->signal->rlim[RLIMIT_NPROC].rlim_cur) {
		if (!capable(CAP_SYS_ADMIN) && !capable(CAP_SYS_RESOURCE) &&
				p->user != &root_user)
			goto bad_fork_free;
	}

	atomic_inc(&p->user->__count);
	atomic_inc(&p->user->processes);
	get_group_info(p->group_info);

	/*
	 * If multiple threads are within copy_process(), then this check
	 * triggers too late. This doesn't hurt, the check is only there
	 * to stop root fork bombs.
	 */
	if (nr_threads >= max_threads)
		goto bad_fork_cleanup_count;

	if (!try_module_get(task_thread_info(p)->exec_domain->module))
		goto bad_fork_cleanup_count;

	if (p->binfmt && !try_module_get(p->binfmt->module))
		goto bad_fork_cleanup_put_domain;

	p->did_exec = 0;
	delayacct_tsk_init(p);	/* Must remain after dup_task_struct() */
	copy_flags(clone_flags, p);
	p->pid = pid;
	retval = -EFAULT;
	if (clone_flags & CLONE_PARENT_SETTID)
		if (put_user(p->pid, parent_tidptr))
			goto bad_fork_cleanup_delays_binfmt;

	INIT_LIST_HEAD(&p->children);
	INIT_LIST_HEAD(&p->sibling);
	p->vfork_done = NULL;
	spin_lock_init(&p->alloc_lock);

	clear_tsk_thread_flag(p, TIF_SIGPENDING);
	init_sigpending(&p->pending);

	p->utime = cputime_zero;
	p->stime = cputime_zero;
 	p->sched_time = 0;
#ifdef CONFIG_TASK_XACCT
	p->rchar = 0;		/* I/O counter: bytes read */
	p->wchar = 0;		/* I/O counter: bytes written */
	p->syscr = 0;		/* I/O counter: read syscalls */
	p->syscw = 0;		/* I/O counter: write syscalls */
#endif
	task_io_accounting_init(p);
	acct_clear_integrals(p);

 	p->it_virt_expires = cputime_zero;
	p->it_prof_expires = cputime_zero;
 	p->it_sched_expires = 0;
 	INIT_LIST_HEAD(&p->cpu_timers[0]);
 	INIT_LIST_HEAD(&p->cpu_timers[1]);
 	INIT_LIST_HEAD(&p->cpu_timers[2]);

	p->lock_depth = -1;		/* -1 = no lock */
	do_posix_clock_monotonic_gettime(&p->start_time);
	p->security = NULL;
	p->io_context = NULL;
	p->io_wait = NULL;
	p->audit_context = NULL;
	cpuset_fork(p);
#ifdef CONFIG_NUMA
 	p->mempolicy = mpol_copy(p->mempolicy);
 	if (IS_ERR(p->mempolicy)) {
 		retval = PTR_ERR(p->mempolicy);
 		p->mempolicy = NULL;
 		goto bad_fork_cleanup_cpuset;
 	}
	mpol_fix_fork_child_flag(p);
#endif
#ifdef CONFIG_TRACE_IRQFLAGS
	p->irq_events = 0;
#ifdef __ARCH_WANT_INTERRUPTS_ON_CTXSW
	p->hardirqs_enabled = 1;
#else
	p->hardirqs_enabled = 0;
#endif
	p->hardirq_enable_ip = 0;
	p->hardirq_enable_event = 0;
	p->hardirq_disable_ip = _THIS_IP_;
	p->hardirq_disable_event = 0;
	p->softirqs_enabled = 1;
	p->softirq_enable_ip = _THIS_IP_;
	p->softirq_enable_event = 0;
	p->softirq_disable_ip = 0;
	p->softirq_disable_event = 0;
	p->hardirq_context = 0;
	p->softirq_context = 0;
#endif
#ifdef CONFIG_LOCKDEP
	p->lockdep_depth = 0; /* no locks held yet */
	p->curr_chain_key = 0;
	p->lockdep_recursion = 0;
#endif

#ifdef CONFIG_DEBUG_MUTEXES
	p->blocked_on = NULL; /* not blocked yet */
#endif

	p->tgid = p->pid;
	if (clone_flags & CLONE_THREAD)
		p->tgid = current->tgid;

	if ((retval = security_task_alloc(p)))
		goto bad_fork_cleanup_policy;
	if ((retval = audit_alloc(p)))
		goto bad_fork_cleanup_security;
	/* copy all the process information */
	if ((retval = copy_semundo(clone_flags, p)))
		goto bad_fork_cleanup_audit;
	if ((retval = copy_files(clone_flags, p)))
		goto bad_fork_cleanup_semundo;
	if ((retval = copy_fs(clone_flags, p)))
		goto bad_fork_cleanup_files;
	if ((retval = copy_sighand(clone_flags, p)))
		goto bad_fork_cleanup_fs;
	if ((retval = copy_signal(clone_flags, p)))
		goto bad_fork_cleanup_sighand;
	if ((retval = copy_mm(clone_flags, p)))
		goto bad_fork_cleanup_signal;
	if ((retval = copy_keys(clone_flags, p)))
		goto bad_fork_cleanup_mm;
	if ((retval = copy_namespaces(clone_flags, p)))
		goto bad_fork_cleanup_keys;
	retval = copy_thread(0, clone_flags, stack_start, stack_size, p, regs);
	if (retval)
		goto bad_fork_cleanup_namespaces;

	p->set_child_tid = (clone_flags & CLONE_CHILD_SETTID) ? child_tidptr : NULL;
	/*
	 * Clear TID on mm_release()?
	 */
	p->clear_child_tid = (clone_flags & CLONE_CHILD_CLEARTID) ? child_tidptr: NULL;
	p->robust_list = NULL;
#ifdef CONFIG_COMPAT
	p->compat_robust_list = NULL;
#endif
	INIT_LIST_HEAD(&p->pi_state_list);
	p->pi_state_cache = NULL;

	/*
	 * sigaltstack should be cleared when sharing the same VM
	 */
	if ((clone_flags & (CLONE_VM|CLONE_VFORK)) == CLONE_VM)
		p->sas_ss_sp = p->sas_ss_size = 0;

	/*
	 * Syscall tracing should be turned off in the child regardless
	 * of CLONE_PTRACE.
	 */
	clear_tsk_thread_flag(p, TIF_SYSCALL_TRACE);
#ifdef TIF_SYSCALL_EMU
	clear_tsk_thread_flag(p, TIF_SYSCALL_EMU);
#endif

	/* Our parent execution domain becomes current domain
	   These must match for thread signalling to apply */
	p->parent_exec_id = p->self_exec_id;

	/* ok, now we should be set up.. */
	p->exit_signal = (clone_flags & CLONE_THREAD) ? -1 : (clone_flags & CSIGNAL);
	p->pdeath_signal = 0;
	p->exit_state = 0;

	/*
	 * Ok, make it visible to the rest of the system.
	 * We dont wake it up yet.
	 */
	p->group_leader = p;
	INIT_LIST_HEAD(&p->thread_group);
	INIT_LIST_HEAD(&p->ptrace_children);
	INIT_LIST_HEAD(&p->ptrace_list);

	/* Perform scheduler related setup. Assign this task to a CPU. */
	sched_fork(p, clone_flags);

	/* Need tasklist lock for parent etc handling! */
	write_lock_irq(&tasklist_lock);

	/* for sys_ioprio_set(IOPRIO_WHO_PGRP) */
	p->ioprio = current->ioprio;

	/*
	 * The task hasn't been attached yet, so its cpus_allowed mask will
	 * not be changed, nor will its assigned CPU.
	 *
	 * The cpus_allowed mask of the parent may have changed after it was
	 * copied first time - so re-copy it here, then check the child's CPU
	 * to ensure it is on a valid CPU (and if not, just force it back to
	 * parent's CPU). This avoids alot of nasty races.
	 */
	p->cpus_allowed = current->cpus_allowed;
	if (unlikely(!cpu_isset(task_cpu(p), p->cpus_allowed) ||
			!cpu_online(task_cpu(p))))
		set_task_cpu(p, smp_processor_id());

	/* CLONE_PARENT re-uses the old parent */
	if (clone_flags & (CLONE_PARENT|CLONE_THREAD))
		p->real_parent = current->real_parent;
	else
		p->real_parent = current;
	p->parent = p->real_parent;

	spin_lock(&current->sighand->siglock);

	/*
	 * Process group and session signals need to be delivered to just the
	 * parent before the fork or both the parent and the child after the
	 * fork. Restart if a signal comes in before we add the new process to
	 * it's process group.
	 * A fatal signal pending means that current will exit, so the new
	 * thread can't slip out of an OOM kill (or normal SIGKILL).
 	 */
 	recalc_sigpending();
	if (signal_pending(current)) {
		spin_unlock(&current->sighand->siglock);
		write_unlock_irq(&tasklist_lock);
		retval = -ERESTARTNOINTR;
		goto bad_fork_cleanup_namespaces;
	}

	if (clone_flags & CLONE_THREAD) {
		p->group_leader = current->group_leader;
		list_add_tail_rcu(&p->thread_group, &p->group_leader->thread_group);

		if (!cputime_eq(current->signal->it_virt_expires,
				cputime_zero) ||
		    !cputime_eq(current->signal->it_prof_expires,
				cputime_zero) ||
		    current->signal->rlim[RLIMIT_CPU].rlim_cur != RLIM_INFINITY ||
		    !list_empty(&current->signal->cpu_timers[0]) ||
		    !list_empty(&current->signal->cpu_timers[1]) ||
		    !list_empty(&current->signal->cpu_timers[2])) {
			/*
			 * Have child wake up on its first tick to check
			 * for process CPU timers.
			 */
			p->it_prof_expires = jiffies_to_cputime(1);
		}
	}

	if (likely(p->pid)) {
		add_parent(p);
		if (unlikely(p->ptrace & PT_PTRACED))
			__ptrace_link(p, current->parent);

		if (thread_group_leader(p)) {
			p->signal->tty = current->signal->tty;
			p->signal->pgrp = process_group(current);
			set_signal_session(p->signal, process_session(current));
			attach_pid(p, PIDTYPE_PGID, process_group(p));
			attach_pid(p, PIDTYPE_SID, process_session(p));

			list_add_tail_rcu(&p->tasks, &init_task.tasks);
			__get_cpu_var(process_counts)++;
		}
		attach_pid(p, PIDTYPE_PID, p->pid);
		nr_threads++;
	}

	total_forks++;
	spin_unlock(&current->sighand->siglock);
	write_unlock_irq(&tasklist_lock);
	proc_fork_connector(p);
	return p;

bad_fork_cleanup_namespaces:
	exit_task_namespaces(p);
bad_fork_cleanup_keys:
	exit_keys(p);
bad_fork_cleanup_mm:
	if (p->mm)
		mmput(p->mm);
bad_fork_cleanup_signal:
	cleanup_signal(p);
bad_fork_cleanup_sighand:
	__cleanup_sighand(p->sighand);
bad_fork_cleanup_fs:
	exit_fs(p); /* blocking */
bad_fork_cleanup_files:
	exit_files(p); /* blocking */
bad_fork_cleanup_semundo:
	exit_sem(p);
bad_fork_cleanup_audit:
	audit_free(p);
bad_fork_cleanup_security:
	security_task_free(p);
bad_fork_cleanup_policy:
#ifdef CONFIG_NUMA
	mpol_free(p->mempolicy);
bad_fork_cleanup_cpuset:
#endif
	cpuset_exit(p);
bad_fork_cleanup_delays_binfmt:
	delayacct_tsk_free(p);
	if (p->binfmt)
		module_put(p->binfmt->module);
bad_fork_cleanup_put_domain:
	module_put(task_thread_info(p)->exec_domain->module);
bad_fork_cleanup_count:
	put_group_info(p->group_info);
	atomic_dec(&p->user->processes);
	free_uid(p->user);
bad_fork_free:
	free_task(p);
fork_out:
	return ERR_PTR(retval);
}

noinline struct pt_regs * __devinit __attribute__((weak)) idle_regs(struct pt_regs *regs)
{
	memset(regs, 0, sizeof(struct pt_regs));
	return regs;
}

struct task_struct * __cpuinit fork_idle(int cpu)
{
	struct task_struct *task;
	struct pt_regs regs;

	task = copy_process(CLONE_VM, 0, idle_regs(&regs), 0, NULL, NULL, 0);
	if (!IS_ERR(task))
		init_idle(task, cpu);

	return task;
}

static inline int fork_traceflag (unsigned clone_flags)
{
	if (clone_flags & CLONE_UNTRACED)
		return 0;
	else if (clone_flags & CLONE_VFORK) {
		if (current->ptrace & PT_TRACE_VFORK)
			return PTRACE_EVENT_VFORK;
	} else if ((clone_flags & CSIGNAL) != SIGCHLD) {
		if (current->ptrace & PT_TRACE_CLONE)
			return PTRACE_EVENT_CLONE;
	} else if (current->ptrace & PT_TRACE_FORK)
		return PTRACE_EVENT_FORK;

	return 0;
}

/*
 *  Ok, this is the main fork-routine.
 *
 * It copies the process, and if successful kick-starts
 * it and waits for it to finish using the VM if required.
 */
long do_fork(unsigned long clone_flags,
	      unsigned long stack_start,
	      struct pt_regs *regs,
	      unsigned long stack_size,
	      int __user *parent_tidptr,
	      int __user *child_tidptr)
{
	struct task_struct *p;
	int trace = 0;
	struct pid *pid = alloc_pid();
	long nr;

	if (!pid)
		return -EAGAIN;
	nr = pid->nr;
	if (unlikely(current->ptrace)) {
		trace = fork_traceflag (clone_flags);
		if (trace)
			clone_flags |= CLONE_PTRACE;
	}

	p = copy_process(clone_flags, stack_start, regs, stack_size, parent_tidptr, child_tidptr, nr);
	/*
	 * Do this prior waking up the new thread - the thread pointer
	 * might get invalid after that point, if the thread exits quickly.
	 */
	if (!IS_ERR(p)) {
		struct completion vfork;

		if (clone_flags & CLONE_VFORK) {
			p->vfork_done = &vfork;
			init_completion(&vfork);
		}

		if ((p->ptrace & PT_PTRACED) || (clone_flags & CLONE_STOPPED)) {
			/*
			 * We'll start up with an immediate SIGSTOP.
			 */
			sigaddset(&p->pending.signal, SIGSTOP);
			set_tsk_thread_flag(p, TIF_SIGPENDING);
		}

		if (!(clone_flags & CLONE_STOPPED))
			wake_up_new_task(p, clone_flags);
		else
			p->state = TASK_STOPPED;

		if (unlikely (trace)) {
			current->ptrace_message = nr;
			ptrace_notify ((trace << 8) | SIGTRAP);
		}

		if (clone_flags & CLONE_VFORK) {
			wait_for_completion(&vfork);
			if (unlikely (current->ptrace & PT_TRACE_VFORK_DONE)) {
				current->ptrace_message = nr;
				ptrace_notify ((PTRACE_EVENT_VFORK_DONE << 8) | SIGTRAP);
			}
		}
	} else {
		free_pid(pid);
		nr = PTR_ERR(p);
	}
	return nr;
}

#ifndef ARCH_MIN_MMSTRUCT_ALIGN
#define ARCH_MIN_MMSTRUCT_ALIGN 0
#endif

static void sighand_ctor(void *data, struct kmem_cache *cachep, unsigned long flags)
{
	struct sighand_struct *sighand = data;

	if ((flags & (SLAB_CTOR_VERIFY | SLAB_CTOR_CONSTRUCTOR)) ==
					SLAB_CTOR_CONSTRUCTOR)
		spin_lock_init(&sighand->siglock);
}

void __init proc_caches_init(void)
{
	sighand_cachep = kmem_cache_create("sighand_cache",
			sizeof(struct sighand_struct), 0,
			SLAB_HWCACHE_ALIGN|SLAB_PANIC|SLAB_DESTROY_BY_RCU,
			sighand_ctor, NULL);
	signal_cachep = kmem_cache_create("signal_cache",
			sizeof(struct signal_struct), 0,
			SLAB_HWCACHE_ALIGN|SLAB_PANIC, NULL, NULL);
	files_cachep = kmem_cache_create("files_cache",
			sizeof(struct files_struct), 0,
			SLAB_HWCACHE_ALIGN|SLAB_PANIC, NULL, NULL);
	fs_cachep = kmem_cache_create("fs_cache",
			sizeof(struct fs_struct), 0,
			SLAB_HWCACHE_ALIGN|SLAB_PANIC, NULL, NULL);
	vm_area_cachep = kmem_cache_create("vm_area_struct",
			sizeof(struct vm_area_struct), 0,
			SLAB_PANIC, NULL, NULL);
	mm_cachep = kmem_cache_create("mm_struct",
			sizeof(struct mm_struct), ARCH_MIN_MMSTRUCT_ALIGN,
			SLAB_HWCACHE_ALIGN|SLAB_PANIC, NULL, NULL);
}

/*
 * Check constraints on flags passed to the unshare system call and
 * force unsharing of additional process context as appropriate.
 */
static inline void check_unshare_flags(unsigned long *flags_ptr)
{
	/*
	 * If unsharing a thread from a thread group, must also
	 * unshare vm.
	 */
	if (*flags_ptr & CLONE_THREAD)
		*flags_ptr |= CLONE_VM;

	/*
	 * If unsharing vm, must also unshare signal handlers.
	 */
	if (*flags_ptr & CLONE_VM)
		*flags_ptr |= CLONE_SIGHAND;

	/*
	 * If unsharing signal handlers and the task was created
	 * using CLONE_THREAD, then must unshare the thread
	 */
	if ((*flags_ptr & CLONE_SIGHAND) &&
	    (atomic_read(&current->signal->count) > 1))
		*flags_ptr |= CLONE_THREAD;

	/*
	 * If unsharing namespace, must also unshare filesystem information.
	 */
	if (*flags_ptr & CLONE_NEWNS)
		*flags_ptr |= CLONE_FS;
}

/*
 * Unsharing of tasks created with CLONE_THREAD is not supported yet
 */
static int unshare_thread(unsigned long unshare_flags)
{
	if (unshare_flags & CLONE_THREAD)
		return -EINVAL;

	return 0;
}

/*
 * Unshare the filesystem structure if it is being shared
 */
static int unshare_fs(unsigned long unshare_flags, struct fs_struct **new_fsp)
{
	struct fs_struct *fs = current->fs;

	if ((unshare_flags & CLONE_FS) &&
	    (fs && atomic_read(&fs->count) > 1)) {
		*new_fsp = __copy_fs_struct(current->fs);
		if (!*new_fsp)
			return -ENOMEM;
	}

	return 0;
}

/*
 * Unshare the mnt_namespace structure if it is being shared
 */
static int unshare_mnt_namespace(unsigned long unshare_flags,
		struct mnt_namespace **new_nsp, struct fs_struct *new_fs)
{
	struct mnt_namespace *ns = current->nsproxy->mnt_ns;

	if ((unshare_flags & CLONE_NEWNS) && ns) {
		if (!capable(CAP_SYS_ADMIN))
			return -EPERM;

		*new_nsp = dup_mnt_ns(current, new_fs ? new_fs : current->fs);
		if (!*new_nsp)
			return -ENOMEM;
	}

	return 0;
}

/*
 * Unsharing of sighand is not supported yet
 */
static int unshare_sighand(unsigned long unshare_flags, struct sighand_struct **new_sighp)
{
	struct sighand_struct *sigh = current->sighand;

	if ((unshare_flags & CLONE_SIGHAND) && atomic_read(&sigh->count) > 1)
		return -EINVAL;
	else
		return 0;
}

/*
 * Unshare vm if it is being shared
 */
static int unshare_vm(unsigned long unshare_flags, struct mm_struct **new_mmp)
{
	struct mm_struct *mm = current->mm;

	if ((unshare_flags & CLONE_VM) &&
	    (mm && atomic_read(&mm->mm_users) > 1)) {
		return -EINVAL;
	}

	return 0;
}

/*
 * Unshare file descriptor table if it is being shared
 */
static int unshare_fd(unsigned long unshare_flags, struct files_struct **new_fdp)
{
	struct files_struct *fd = current->files;
	int error = 0;

	if ((unshare_flags & CLONE_FILES) &&
	    (fd && atomic_read(&fd->count) > 1)) {
		*new_fdp = dup_fd(fd, &error);
		if (!*new_fdp)
			return error;
	}

	return 0;
}

/*
 * Unsharing of semundo for tasks created with CLONE_SYSVSEM is not
 * supported yet
 */
static int unshare_semundo(unsigned long unshare_flags, struct sem_undo_list **new_ulistp)
{
	if (unshare_flags & CLONE_SYSVSEM)
		return -EINVAL;

	return 0;
}

#ifndef CONFIG_IPC_NS
static inline int unshare_ipcs(unsigned long flags, struct ipc_namespace **ns)
{
	if (flags & CLONE_NEWIPC)
		return -EINVAL;

	return 0;
}
#endif

/*
 * unshare allows a process to 'unshare' part of the process
 * context which was originally shared using clone.  copy_*
 * functions used by do_fork() cannot be used here directly
 * because they modify an inactive task_struct that is being
 * constructed. Here we are modifying the current, active,
 * task_struct.
 */
asmlinkage long sys_unshare(unsigned long unshare_flags)
{
	int err = 0;
	struct fs_struct *fs, *new_fs = NULL;
	struct mnt_namespace *ns, *new_ns = NULL;
	struct sighand_struct *new_sigh = NULL;
	struct mm_struct *mm, *new_mm = NULL, *active_mm = NULL;
	struct files_struct *fd, *new_fd = NULL;
	struct sem_undo_list *new_ulist = NULL;
	struct nsproxy *new_nsproxy = NULL, *old_nsproxy = NULL;
	struct uts_namespace *uts, *new_uts = NULL;
	struct ipc_namespace *ipc, *new_ipc = NULL;

	check_unshare_flags(&unshare_flags);

	/* Return -EINVAL for all unsupported flags */
	err = -EINVAL;
	if (unshare_flags & ~(CLONE_THREAD|CLONE_FS|CLONE_NEWNS|CLONE_SIGHAND|
				CLONE_VM|CLONE_FILES|CLONE_SYSVSEM|
				CLONE_NEWUTS|CLONE_NEWIPC))
		goto bad_unshare_out;

	if ((err = unshare_thread(unshare_flags)))
		goto bad_unshare_out;
	if ((err = unshare_fs(unshare_flags, &new_fs)))
		goto bad_unshare_cleanup_thread;
	if ((err = unshare_mnt_namespace(unshare_flags, &new_ns, new_fs)))
		goto bad_unshare_cleanup_fs;
	if ((err = unshare_sighand(unshare_flags, &new_sigh)))
		goto bad_unshare_cleanup_ns;
	if ((err = unshare_vm(unshare_flags, &new_mm)))
		goto bad_unshare_cleanup_sigh;
	if ((err = unshare_fd(unshare_flags, &new_fd)))
		goto bad_unshare_cleanup_vm;
	if ((err = unshare_semundo(unshare_flags, &new_ulist)))
		goto bad_unshare_cleanup_fd;
	if ((err = unshare_utsname(unshare_flags, &new_uts)))
		goto bad_unshare_cleanup_semundo;
	if ((err = unshare_ipcs(unshare_flags, &new_ipc)))
		goto bad_unshare_cleanup_uts;

	if (new_ns || new_uts || new_ipc) {
		old_nsproxy = current->nsproxy;
		new_nsproxy = dup_namespaces(old_nsproxy);
		if (!new_nsproxy) {
			err = -ENOMEM;
			goto bad_unshare_cleanup_ipc;
		}
	}

	if (new_fs || new_ns || new_mm || new_fd || new_ulist ||
				new_uts || new_ipc) {

		task_lock(current);

		if (new_nsproxy) {
			current->nsproxy = new_nsproxy;
			new_nsproxy = old_nsproxy;
		}

		if (new_fs) {
			fs = current->fs;
			current->fs = new_fs;
			new_fs = fs;
		}

		if (new_ns) {
			ns = current->nsproxy->mnt_ns;
			current->nsproxy->mnt_ns = new_ns;
			new_ns = ns;
		}

		if (new_mm) {
			mm = current->mm;
			active_mm = current->active_mm;
			current->mm = new_mm;
			current->active_mm = new_mm;
			activate_mm(active_mm, new_mm);
			new_mm = mm;
		}

		if (new_fd) {
			fd = current->files;
			current->files = new_fd;
			new_fd = fd;
		}

		if (new_uts) {
			uts = current->nsproxy->uts_ns;
			current->nsproxy->uts_ns = new_uts;
			new_uts = uts;
		}

		if (new_ipc) {
			ipc = current->nsproxy->ipc_ns;
			current->nsproxy->ipc_ns = new_ipc;
			new_ipc = ipc;
		}

		task_unlock(current);
	}

	if (new_nsproxy)
		put_nsproxy(new_nsproxy);

bad_unshare_cleanup_ipc:
	if (new_ipc)
		put_ipc_ns(new_ipc);

bad_unshare_cleanup_uts:
	if (new_uts)
		put_uts_ns(new_uts);

bad_unshare_cleanup_semundo:
bad_unshare_cleanup_fd:
	if (new_fd)
		put_files_struct(new_fd);

bad_unshare_cleanup_vm:
	if (new_mm)
		mmput(new_mm);

bad_unshare_cleanup_sigh:
	if (new_sigh)
		if (atomic_dec_and_test(&new_sigh->count))
			kmem_cache_free(sighand_cachep, new_sigh);

bad_unshare_cleanup_ns:
	if (new_ns)
		put_mnt_ns(new_ns);

bad_unshare_cleanup_fs:
	if (new_fs)
		put_fs_struct(new_fs);

bad_unshare_cleanup_thread:
bad_unshare_out:
	return err;
}


text:
This is an implementation of cross-lingual matrix factorization using ALS as described in [Learning Cross-lingual Representations with Matrix Factorization](https://aclweb.org/anthology/W/W16/W16-1201.pdf). This project is based on the orthogonal matrix factorization (OrMF) scripts available [here](http://www.cs.columbia.edu/~weiwei/code.html).

If you use this code, please cite the following papers:

```
@article{aldarmakilearning,
  title={Learning Cross-lingual Representations with Matrix Factorization},
  author={Aldarmaki, Hanan and Diab, Mona},
  booktitle={Proceedings of the Workshop on Multilingual and Cross-lingual Methods in NLP},
  year={2016}
}
```

```
@inproceedings{guo2012modeling,
  title={Modeling sentences in the latent space},
  author={Guo, Weiwei and Diab, Mona},
  booktitle={Proceedings of the 50th Annual Meeting of the Association for Computational Linguistics},
  year={2012}
}

```
# How To

## Preprocessing

Before using this code, it is recommended to tokenize and stem the data. Make sure test sentences are processed the same way as training sentences.

The input files must contain one sentence per line. Digits will be normalized and all characters lower-cased within the training scripts below.

## Training

To train a pivot model, use the *train.pl* script in the *bin* directory

```
perl train.pl model_dir  train_file  K  lambda  wm  alpha  n_itrs
```
where *K* is the vector size, *lambda* is the regularization parameters, *wm* the missing words weight, and *alpha* used for orthogonal projection (set to 0 to disable).

For example:

```
perl train.pl pivot_model_dir train_file.txt  100  20  0.01  0  20
```

The model will be saved in *pivot_model_dir*

### Additional Languages

To train additional models, use *train_xmf.pl* in the *bin* directory:

```
perl train_xmf.pl  pivot_model_dir new_model_dir train_file1 train_file2  K  lambda  wm  alpha  n_itrs
```
where *train_file1* and *train_file2* are parallel sentences in the pivot and new language, respectively. The model for the new language will be saved in *new_model_dir*

## Testing

To use a trained model, use the *test.pl* script in the *bin* directory, which will output one vector per line (corresponding to the input snetences)

```
perl  test.pl  model_dir  test_file
```

To output a similarity score between two sets of vectors, use *get_sim.pl* in *bin/Postprocess*

```
perl get_sim.pl input_file1 input_file2 output_file cutoff
```

Which will output the similarity score between the vectors in *input_file1* and *input_file2*. The cutoff should be set to 1 unless you want to normalize all scores above a certain value.

*correlation.pl* can be used to calculate the Pearson correlation between two sets of similarity scores.

redpajama_set_name: RedPajamaGithub


text:
<?php
/**
 * Created by PhpStorm.
 * User: famoser
 * Date: 22/05/2016
 * Time: 23:01
 */

namespace Famoser\MassPass\Models\Request;

use Famoser\MassPass\Models\Request\Base\ApiRequest;

class SyncRequest extends ApiRequest
{
    /**
     * @var Entities\RefreshEntity[] $RefreshEntities
     */
    public $RefreshEntities;
    /**
     * @var string[] $CollectionIds
     */
    public $CollectionIds;
}


text:
package com.fishercoder;

import com.fishercoder.solutions._473;
import org.junit.BeforeClass;
import org.junit.Test;

import static org.junit.Assert.assertEquals;

/**
 * Created by stevesun on 5/30/17.
 */
public class _473Test {
    private static _473 test;
    private static int[] nums;

    @BeforeClass
    public static void setup() {
        test = new _473();
    }

    @Test
    public void test1() {
        nums = new int[]{1, 1, 2, 2, 2};
        assertEquals(true, test.makesquare(nums));
    }
}


text:
package de.fhg.iais.cortex.services;

/**
 * Works on the dom representing the cortex data model.
 */
public interface IIngestWorker {
    /**
     * Check is service is to be applied or must be skipped.
     *
     * @param context IngestContext
     * @return
     */
    public boolean isApplicable(IIngestContext context);

    /**
     * Apply the service on the SIP.
     *
     * @param context IngestContext
     * @return false if you want to stop the processing
     */
    public boolean apply(IIngestContext context);
}


text:
package nishi_service::Web::Dispatcher;
use strict;
use warnings;
use utf8;
use JSON::XS;
use nishi_service::Utils qw/darkness/;
use Data::Validate::URI qw/is_uri/;
use Amon2::Web::Dispatcher::RouterBoom;

sub is_login {
    my $session = shift;
    my $username = $session->get('username') // '';
    return 0 unless $username;
    return 1;
}

get '/' => sub {
    my $c = shift;
    if (is_login($c->session)) {
        my $username = $c->session->get('username');
        my $token = $c->session->get('token');
        return $c->render('index.tx', {
           token => $token,
        });
    }

    return $c->redirect('/login');
};

get '/login' => sub { shift->render('login.tx') };

get '/account/login' => sub {
    my $c = shift;
    return $c->redirect('/') if is_login($c->session);
    return $c->render('account.tx');
};

get '/account/register' => sub {
    my $c = shift;
    my $token = $c->session->get('token') // '';
    return $c->redirect('/login') unless $token;

    $c->render('register.tx');
};

post '/auth' => sub {
    my $c = shift;
    my $v = $c->validator;
    $v->check(
        username => [qw/NOT_NULL/],
        password => [[qw/LENGTH 4 16/]]
    );

    if ($v->is_valid) {
        my $username = $v->query->param('username');
        my $password = $v->query->param('password');
        my $token = darkness->find_token($username => $password)->token;
        $c->session->set(username => $username);
        $c->session->set(token => $token);

        return $c->redirect('/');
    }

    return $c->redirect('/account/register');
};

post '/adduser' => sub {
    my $c = shift;
    my $v = $c->validator;
    $v->check(
        username => [qw/NOT_NULL/],
        password => [[qw/LENGTH 4 16/]]
    );

    if ($v->is_valid) {
        my $token = $c->session->get('token') or die "failed to get token from session";
        my $username = $v->query->param('username');
        my $password = $v->query->param('password');

        darkness->create_user($token => {
            username => $username,
            password => $password,
        }) or die "Cannot create user";

        $c->session->set(username => $username);
        $c->session->set(token => $token);

        return $c->redirect('/');
    }

    return $c->redirect('/account/register');
};

post '/addurl' => sub {
    my $c = shift;
    my $username = $c->session->get('username');
    my $content = $c->req->decoded_json;
    foreach my $url (@{$content->{urls}}) {
        warn "Do $url";
        if (is_uri($url)) {
            my $result = darkness->insert_url($username => $url);
            return $c->render_json(+{status => 'failed', reason => "Could not insert url: $url"}) unless $result;
        } else {
            warn "Not url: $url";
        }
    }
    return $c->render_json(+{status => 'success'});
};

get '/logout' => sub {
    my $c = shift;
    $c->session->expire();
    return $c->redirect('/');
};

1;


text:
import glob, os, pipes, sys, subprocess

device_id = os.environ.get('SANITIZER_IOSSIM_TEST_DEVICE_IDENTIFIER')
if not device_id:
  raise EnvironmentError("Specify SANITIZER_IOSSIM_TEST_DEVICE_IDENTIFIER to select which simulator to use.")

for e in ["ASAN_OPTIONS", "TSAN_OPTIONS", "UBSAN_OPTIONS", "APPLE_ASAN_INIT_FOR_DLOPEN", "ASAN_ACTIVATION_OPTIONS"]:
  if e in os.environ:
    os.environ["SIMCTL_CHILD_" + e] = os.environ[e]

prog = sys.argv[1]
exit_code = None
if prog == 'rm':
  # The simulator and host actually share the same file system so we can just
  # execute directly on the host.
  rm_args = []
  for arg in sys.argv[2:]:
    if '*' in arg or '?' in arg:
      # Don't quote glob pattern
      rm_args.append(arg)
    else:
      # FIXME(dliew): pipes.quote() is deprecated
      rm_args.append(pipes.quote(arg))
  rm_cmd_line = ["/bin/rm"] + rm_args
  rm_cmd_line_str = ' '.join(rm_cmd_line)
  # We use `shell=True` so that any wildcard globs get expanded by the shell.
  exitcode = subprocess.call(rm_cmd_line_str, shell=True)
else:
  exitcode = subprocess.call(["xcrun", "simctl", "spawn", "--standalone", device_id] + sys.argv[1:])
if exitcode > 125:
  exitcode = 126
sys.exit(exitcode)


text:
import onSearchBarChange from './onSearchBarChange'
export { onSearchBarChange }


text:
/**
 * Created by jonbcampos on 4/17/15.
 */
describe('common.directives.validations.integer', function () {

    var $scope, form;
    beforeEach(module('common.directives.validations.integer'));
    beforeEach(inject(function ($compile, $rootScope) {
        $scope = $rootScope;
        var element = angular.element(
            '<form name="form">' +
            '<input ng-model="model.someval" name="someval" integer/>' +
            '</form>'
        );
        $scope.model = {"someval": null};
        $compile(element)($scope);
        form = $scope.form;
    }));

    describe('integer', function () {

        describe('change view', function () {

            it('should fail with letter', function () {
                form.someval.$setViewValue('a');
                $scope.$digest();
                expect($scope.model.someval).toBeUndefined();
                expect(form.someval.$valid).toBeFalsy();
            });

            it('should pass with numbers', function () {
                form.someval.$setViewValue('1');
                $scope.$digest();
                expect($scope.model.someval).toBe('1');
                expect(form.someval.$valid).toBeTruthy();
            });

            it('should fail with decimals', function () {
                form.someval.$setViewValue('1.1');
                $scope.$digest();
                expect($scope.model.someval).toBeUndefined();
                expect(form.someval.$valid).toBeFalsy();
            });

        });

        describe('change model', function () {

            it('should fail with letter', function () {
                $scope.model.someval = "a";
                $scope.$digest();
                expect($scope.model.someval).toBe("a");
                expect(form.someval.$valid).toBeFalsy();
            });

            it('should pass with numbers', function () {
                $scope.model.someval = "1";
                $scope.$digest();
                expect($scope.model.someval).toBe('1');
                expect(form.someval.$valid).toBeTruthy();
            });

            it('should fail with decimals', function () {
                $scope.model.someval = "1.1";
                $scope.$digest();
                expect($scope.model.someval).toBe('1.1');
                expect(form.someval.$valid).toBeFalsy();
            });

        });

    });

});


text:
"""Tasks related to Python gRPC code generation"""

import io
import os
import re
import tempfile
import time

from ruamel import yaml

from artman.utils import protoc_utils
from artman.tasks import task_base

class PythonChangePackageTask(task_base.TaskBase):
    """Copies source protos to a package that meets Python convention"""
    default_provides = ('final_src_proto_path',
                        'final_import_proto_path')

    _IDENTIFIER = '[A-Za-z_][A-Za-z_0-9]*'

    _BASE_PROTO_REGEX = (
        '(?P<prefix>{prefix})' +
        '(?P<package>' + _IDENTIFIER +
        '({separator}' + _IDENTIFIER + ')*{package_suffix})'
        '(?P<suffix>{suffix})')

    # E.g., `package google.foo.bar`
    _PACKAGE_REGEX = re.compile(_BASE_PROTO_REGEX.format(
        prefix='^package ',
        separator='\\.',
        package_suffix='',
        suffix=''))

    # E.g., `import "google/foo/bar";`
    _IMPORT_REGEX = re.compile(_BASE_PROTO_REGEX.format(
        prefix='^import "',
        separator='/',
        package_suffix='\\.proto',
        suffix='";'))

    # TODO (geigerj): add regex for documentation link updates?

    def execute(self, src_proto_path, import_proto_path, common_protos_yaml):
        with io.open(common_protos_yaml) as file_:
            common_protos_data = yaml.load(file_, Loader=yaml.Loader)

        # Treat google.protobuf, google.iam as a common proto package, even
        # though they are not included in the common-protos we generate.
        #
        # TODO (geigerj): remove 'google.iam' when it is included in the common
        # protos package.
        common_protos = ['google.protobuf', 'google.iam']
        for package in common_protos_data['packages']:
            common_protos.append('google.' + package['name'].replace('/', '.'))

        tmpdir = os.path.join(
            tempfile.gettempdir(), 'artman-python', str(int(time.time())))
        new_proto_dir = os.path.join(tmpdir, 'proto')
        new_src_path = set()
        new_import_path = [new_proto_dir]

        self._copy_and_transform_directories(
            src_proto_path, new_proto_dir, common_protos, paths=new_src_path)
        self._copy_and_transform_directories(
            import_proto_path, new_proto_dir, common_protos)

        # Update src_proto_path, import_proto_path
        return list(new_src_path), new_import_path

    def _extract_base_dirs(self, proto_file):
        """Return the proto file path derived from the package name."""

        with io.open(proto_file, 'rt', encoding='UTF-8') as proto:
            for line in proto:
                pkg = self._PACKAGE_REGEX.match(line)
                if pkg:
                    pkg = pkg.group('package')
                    return os.path.sep.join(pkg.split('.'))
            return ''

    def _transform(self, pkg, sep, common_protos):
        """Add 'proto' package after 'google' or 'google.cloud'

        Works with arbitrary separator (e.g., '/' for import statements,
        '.' for proto package statements, os.path.sep for filenames)
        """
        # Skip common protos
        pkg_list = pkg.split(sep)

        dotted = '.'.join(pkg_list)
        for common_pkg in common_protos:
            if dotted.startswith(common_pkg):
                return sep.join(pkg_list)

        if pkg_list[0] == 'google':
            if pkg_list[1] == 'cloud':
                return sep.join(['google', 'cloud', 'proto'] + pkg_list[2:])
            return sep.join(['google', 'cloud', 'proto'] + pkg_list[1:])
        return sep.join(pkg_list)

    def _copy_proto(self, src, dest, common_protos):
        """Copies a proto while fixing its imports"""
        with io.open(src, 'r', encoding='UTF-8') as src_lines:
            with io.open(dest, 'w+', encoding='UTF-8') as dest_file:
                for line in src_lines:
                    imprt = self._IMPORT_REGEX.match(line)
                    if imprt:
                        dest_file.write('import "{}";\n'.format(
                            self._transform(
                                imprt.group('package'), '/', common_protos)))
                    else:
                        dest_file.write(line)

    def _copy_and_transform_directories(
            self, src_directories, destination_directory, common_protos,
            paths=None):
        for path in src_directories:
            protos = list(protoc_utils.find_protos([path], []))
            for proto in protos:
                src_base_dirs = self._extract_base_dirs(proto)
                sub_new_src = os.path.join(
                    destination_directory,
                    self._transform(
                        src_base_dirs, os.path.sep, common_protos))
                if paths is not None:
                    paths.add(sub_new_src)

                dest = os.path.join(sub_new_src, os.path.basename(proto))
                if not os.path.exists(dest):
                    self.exec_command(['mkdir', '-p', sub_new_src])
                self._copy_proto(
                    proto, os.path.join(sub_new_src, dest), common_protos)


text:
/* The ConfappDAO must be constructed with a connected database object */
function ConfappDAO(db) {
    "use strict";

    /* If this constructor is called without the "new" operator, "this" points
     * to the global object. Log a warning and call it correctly. */
    if (false === (this instanceof ConfappDAO)) {
        console.log('Warning: ConfappDAO constructor called without "new" operator');
        return new ConfappDAO(db);
    }

    var confapp = db.collection("confapp");

	this.getEventids = function(username, callback) {
        "use strict";
		username = "test15";
        confapp.findOne( {'creator': username}, {'home':1, '_id': 1},function(err, social1) {
            "use strict";

			console.log(social1);
            if (err) return callback(err, null);

            callback(null, social1);
        });
    }

	this.getSocial = function(username, callback) {
        "use strict";
        confapp.findOne({'creator': username}, {'social':1, '_id': 0},function(err, social1) {
            "use strict";

			console.log(social1);
            if (err) return callback(err, null);

            callback(null, social1);
        });
    }

	this.getHome = function(username, callback) {
        "use strict";
        confapp.findOne({'creator': username}, {'home':1, '_id': 0},function(err, home1) {
            "use strict";

			console.log(home1);
            if (err) return callback(err, null);

            callback(null, home1);
        });
    }

	this.getgallerylist = function(username, callback) {
        "use strict";

        confapp.findOne({'creator': username}, {'gallery':1, '_id': 0},function(err, home1) {
            "use strict";

			console.log(home1);
            if (err) return callback(err, null);

            callback(null, home1);
        });
    }

	this.getnotificationlist = function(username, callback) {
        "use strict";

        confapp.findOne({'creator': username}, {'notifications':1, '_id': 0},function(err, home1) {
            "use strict";

			console.log(home1);
            if (err) return callback(err, null);

            callback(null, home1);
        });
    }

	this.getvenue = function(username, callback) {
        "use strict";

        confapp.findOne({'creator': username}, {'venue':1, '_id': 0},function(err, home1) {
            "use strict";

			console.log(home1);
            if (err) return callback(err, null);

            callback(null, home1);
        });
    }

	this.geteventdetails = function(username, callback) {
        "use strict";

        confapp.findOne({'creator': username}, {'venue':1, 'home':1,'gallery':1, 'notifications':1,'agenda':1, '_id': 0},function(err, home1) {
            "use strict";

			console.log(home1);
            if (err) return callback(err, null);

            callback(null, home1);
        });
    }
	this.loadevent = function(id, callback) {
        "use strict";

					var query = {};
			query['_id'] = id;

			var ObjectID = require('mongodb').ObjectID;
	var o_id = new ObjectID(id);

        confapp.findOne( {'_id': o_id}, {'venue':1, 'home':1,'gallery':1, 'notifications':1,'agenda':1, '_id': 0},function(err, home1) {
            "use strict";

			console.log(home1);
            if (err) return callback(err, null);

            callback(null, home1);
        });
    }

	this.search = function(str, num, callback) {
        "use strict";

		var pattern  = "/" + str + "/" + "i";
		  console.log("Pattern " + pattern);
        //confapp.find({ 'home.name' : {$regex : pattern} }).limit(num).toArray(function(err, items) {

	//		confapp.find({ 'home.name' : new RegExp(str) }, {'home.name':1}, function(err, items) {

		confapp.find({ 'home.name' : new RegExp(str) } , {'home.name':1}).toArray(function(err, items) {
            "use strict";

            if (err) return callback(err, null);

			console.log (items);
            console.log("Found " + items.length + " posts");

            callback(err, items);
        });
    }

	this.getagenda = function(username, callback) {
        "use strict";

        confapp.findOne({'creator': username}, {'agenda':1, '_id': 0},function(err, home1) {
            "use strict";

			console.log(home1);
            if (err) return callback(err, null);

            callback(null, home1);
        });
    }

	 this.insertEntry = function (username, callback) {
        "use strict";

		var companyevent = {
		 "home" : {
	  		},
		"agenda":{
	 		},
		venue :{
		},
  gallery : [],
  notifications: [],
  social: {facebook:{}, twitter:{}},

  users : [] , // list of users
  adminusers: [], // admin userid
  creator : username
		};

		confapp.insert(companyevent,{w:1}, function (err, result) {
            "use strict";

            if (!err) {
                console.log("Inserted new user");
                return callback(null, result);
            }

            return callback(err, null);
        });

    }

	this.addSocial = function(username, social, callback) {
        "use strict";
		  confapp.findOne({'creator': username}, function(err, record) {
            "use strict";

            if (err) return callback(err, null);

			if( record != null) {
			var query = {};
			query['_id'] = record['_id'];

			confapp.update(query, {$set: { social:social}}, function (err){

			if (err) return callback (err, null);
			callback(null, 1);
			});

		  }

        });
	}

		this.addHome = function(username, home, callback) {
        "use strict";
		  confapp.findOne({'creator': username}, function(err, record) {
            "use strict";

            if (err) return callback(err, null);

			if( record != null) {
			var query = {};
			query['_id'] = record['_id'];

			confapp.update(query, {$set: { home:home}}, function (err){

			if (err) return callback (err, null);
			callback(null, 1);
			});

		  }

        });

    }

	this.addAgenda = function(username, agenda, callback) {
        "use strict";
		  confapp.findOne({'creator': username}, function(err, record) {
            "use strict";

            if (err) return callback(err, null);

			if( record != null) {
			var query = {};
			query['_id'] = record['_id'];

			confapp.update(query, {$set: { agenda:agenda}}, function (err){

			if (err) return callback (err, null);
			callback(null, 1);
			});

		  }

        });

    }

	this.addVenue = function(username, venue, callback) {
        "use strict";
		  confapp.findOne({'creator': username}, function(err, record) {
            "use strict";

            if (err) return callback(err, null);

			if( record != null) {
			var query = {};
			query['_id'] = record['_id'];

			confapp.update(query, {$set: { venue:venue}}, function (err){

			if (err) return callback (err, null);
			callback(null, 1);
			});

		  }

        });

    }

		this.addGallery = function(username, gallery, callback) {
        "use strict";
		  confapp.findOne({'creator': username}, function(err, record) {
            "use strict";

            if (err) return callback(err, null);

			if( record != null) {
			var query = {};
			query['_id'] = record['_id'];

			confapp.update(query, {$push: { gallery:gallery}}, function (err){

			if (err) return callback (err, null);
			callback(null, 1);
			});

		  }

        });

    }

		this.addNotification = function(username, notification, callback) {
        "use strict";
		  confapp.findOne({'creator': username}, function(err, record) {
            "use strict";

            if (err) return callback(err, null);

			if( record != null) {
			var query = {};
			query['_id'] = record['_id'];

			confapp.update(query, {$push: { notifications:notification}}, function (err){

			if (err) return callback (err, null);
			callback(null, 1);
			});

		  }

        });

    }

/*
    this.insertEntry = function (title, body, tags, author, callback) {
        "use strict";
        console.log("inserting blog entry" + title + body);

        // fix up the permalink to not include whitespace
        var permalink = title.replace( /\s/g, '_' );
        permalink = permalink.replace( /\W/g, '' );

        // Build a new post
        var post = {"title": title,
                "author": author,
                "body": body,
                "permalink":permalink,
                "tags": tags,
                "comments": [],
                "date": new Date()}

        // now insert the post
        // hw3.2 TODO
        //callback(Error("insertEntry NYI"), null);

		posts.insert(post,{w:1}, function (err, result) {
            "use strict";

            if (!err) {
                console.log("Inserted new user");
                return callback(null, permalink);
            }

            return callback(err, null);
        });

    }

    this.getPosts = function(num, callback) {
        "use strict";

        posts.find().sort('date', -1).limit(num).toArray(function(err, items) {
            "use strict";

            if (err) return callback(err, null);

            console.log("Found " + items.length + " posts");

            callback(err, items);
        });
    }

    this.getPostsByTag = function(tag, num, callback) {
        "use strict";

        posts.find({ tags : tag }).sort('date', -1).limit(num).toArray(function(err, items) {
            "use strict";

            if (err) return callback(err, null);

            console.log("Found " + items.length + " posts");

            callback(err, items);
        });
    }

    this.getPostByPermalink = function(permalink, callback) {
        "use strict";
        posts.findOne({'permalink': permalink}, function(err, post) {
            "use strict";

            if (err) return callback(err, null);

            callback(err, post);
        });
    }

    this.addComment = function(permalink, name, email, body, callback) {
        "use strict";

        var comment = {'author': name, 'body': body}

        if (email != "") {
            comment['email'] = email
        }

        // hw3.3 TODO
        // callback(Error("addComment NYI"), null);

		  posts.findOne({'permalink': permalink}, function(err, post) {
            "use strict";

            if (err) return callback(err, null);

			var query = {};
			query['_id'] = post['_id'];

			posts.update(query, {$push: { comments:comment}}, function (err){

			if (err) return callback (err, null);
			callback(null, 1);
			});

        });

    }
	*/
}

module.exports.ConfappDAO = ConfappDAO;


text:
'use strict';

describe('Service: dashboard', function () {

  // load the service's module
  beforeEach(module('jewelryShopApp'));

  // instantiate service
  var dashboard;
  beforeEach(inject(function (_dashboard_) {
    dashboard = _dashboard_;
  }));

  it('should do something', function () {
    expect(!!dashboard).toBe(true);
  });

});