/* Check if a directory can be found inside another in the hierarchy */
int
vn_isunder(struct vnode *lvp, struct vnode *rvp, struct proc *p)
{
int error;
error = vfs_getcwd_common(lvp, rvp, NULL, NULL, MAXPATHLEN/2, 0, p);
if (!error)
return (1);
return (0);
}
/* Find pathname of a process's current directory */
int
sys___getcwd(struct proc *p, void *v, register_t *retval)
{
struct sys___getcwd_args *uap = v;
int error, lenused, len = SCARG(uap, len);
char *path, *bp, *bend;
if (len > MAXPATHLEN * 4)
len = MAXPATHLEN * 4;
else if (len < 2)
return (ERANGE);
path = malloc(len, M_TEMP, M_WAITOK);
bp = &path[len];
bend = bp;
*(--bp) = '\0';
/*
* 5th argument here is "max number of vnodes to traverse".
* Since each entry takes up at least 2 bytes in the output
* buffer, limit it to N/2 vnodes for an N byte buffer.
*/
error = vfs_getcwd_common(p->p_fd->fd_cdir, NULL, &bp, path, len/2,
GETCWD_CHECK_ACCESS, p);
if (error)
goto out;
lenused = bend - bp;
*retval = lenused;
/* Put the result into user buffer */
error = copyout(bp, SCARG(uap, buf), lenused);
out:
free(path, M_TEMP);
return (error);
}
