int
myaccess(char *f)
{
	return access(f, AEXIST);
}

void*
mysbrk(ulong size)
{
	return sbrk(size);
}

int
mycreat(char *n, int p)
{

	return create(n, 1, p);
}

int
mywait(int *s)
{
	int p;
	Waitmsg *w;

	if((w = wait()) == nil)
		return -1;
	else{
		p = w->pid;
		*s = 0;
		if(w->msg[0])
			*s = 1;
		free(w);
		return p;
	}
}

int
mydup(int f1, int f2)
{
	return dup(f1,f2);
}

int
mypipe(int *fd)
{
	return pipe(fd);
}

int
systemtype(int sys)
{
	return sys & Plan9;
}

int
pathchar(void)
{
	return '/';
}

char*
mygetwd(char *path, int len)
{
	return getwd(path, len);
}

int
myexec(char *path, char *argv[])
{
	return exec(path, argv);
}

int
myfork(void)
{
	return fork();
}

/*
 * real allocs
 */
void
gethunk(void)
{
	char *h;
	ulong nh;

	nh = NHUNK;
	if(thunk >= 10L*NHUNK)
		nh = 10L*NHUNK;
	h = (char*)mysbrk(nh);
	if(h == (char*)-1)
		sysfatal("out of memory");
	if(nhunk == 0)
		hunk = h;
	else
		nh += (h - hunk) - nhunk;
	nhunk += nh;
	thunk += nh;
}

void*
alloc(long n)
{
	void *p;

	while((uintptr)hunk & 7) {
		hunk++;
		nhunk--;
	}
	while(nhunk < n)
		gethunk();
	p = hunk;
	nhunk -= n;
	hunk += n;
	return p;
}

void*
allocn(void *p, long on, long n)
{
	void *q;

	q = (uchar*)p + on;
	if(q != hunk || nhunk < n) {
		while(nhunk < on+n)
			gethunk();
		memmove(hunk, p, on);
		p = hunk;
		hunk += on;
		nhunk -= on;
	}
	hunk += n;
	nhunk -= n;
	return p;
}

/*
 * fake mallocs
 */
void*
malloc(ulong n)
{
	return alloc(n);
}

void*
calloc(ulong m, ulong n)
{
	return alloc(m*n);
}

void*
realloc(void *o, ulong n)
{
	ulong m;
	void *a;

	if(n == 0)
		return nil;
	if(o == nil)
		return alloc(n);
	a = alloc(n);
	m = (char*)a - (char*)o;
	if(m < n)
		n = m;
	memmove(a, o, n);
	return a;
}

void
free(void*)
{
}

/* needed when profiling */
void*
mallocz(ulong size, int)
{
	return alloc(size);
}

void
setmalloctag(void*, uintptr)
{
}

void
setrealloctag(void*, uintptr)
{
}