void on_user_leave(user_ptr user)
{
rw_mutex.lock();
auto pos = std::find_if(users.begin(), users.end(), [user](user_ptr &ptr)
{
return ptr.get() == user.get();
});
if (pos != users.end())
{
users.erase(pos);
}
rw_mutex.unlock();
#ifdef DEBUG
std::cout << "User leaved" << std::endl;
#endif
}
ssize_t write(int fd, const user_ptr<void> _buf, size_t count)
{
shared_ptr<file> f;
int ret = get_fd(fd, f);
if (unlikely(ret != 0))
return ret;
if (unlikely((f->oflags & O_ACCMODE) == O_RDONLY))
return -EACCES;
auto buf = (const char*) _buf.get();
if (unlikely(!buf || !_buf.check_region(buf, buf + count)))
return -EFAULT;
return f->write(buf, count);
}
int open(const user_ptr<char> _path, int flags, mode_t mode)
{
const auto p = process::get_current_proc();
if (unlikely(!p))
return -EFAULT;
if (unlikely(p->fd_table.next_fd >= int(process::PROC_MAX_FDS)))
return -EMFILE;
int fd = p->fd_table.next_fd;
auto path = _path.get();
if (unlikely(!path))
return -EFAULT;
// TODO check string
auto nd = p->root_sb->walk(path);
// TODO handle O_CREAT
if (!nd)
return -ENOENT;
else if (S_ISDIR(nd->ind->mode) &&
((flags & O_WRONLY) || (flags & O_RDWR)))
return -EISDIR;
shared_ptr<file> f;
int ret = nd->open(f);
if (unlikely(ret != 0))
return ret;
f->oflags = flags;
if (int(p->fd_table.fds.size()) > fd)
p->fd_table.fds[fd] = f;
else {
ASSERTH(p->fd_table.fds.size() == size_t(fd));
p->fd_table.fds.push_back(f);
}
// search for the next free fd
for (p->fd_table.next_fd++;
p->fd_table.next_fd < int(p->fd_table.fds.size()) &&
p->fd_table.fds[p->fd_table.next_fd];
p->fd_table.next_fd++) ;
return fd;
}
int lseek(int fd, user_ptr<off_t> _poffset, int whence)
{
off_t* const poffset = _poffset.get();
if (unlikely(!poffset))
return -EFAULT;
int ret;
shared_ptr<file> f;
ret = get_fd(fd, f);
if (unlikely(ret != 0))
return ret;
off_t pos = f->position;
switch (whence) {
case SEEK_SET:
pos = *poffset;
break;
case SEEK_CUR:
pos += *poffset;
break;
case SEEK_END:
pos = f->nd->ind->size + *poffset;
break;
default:
return -EINVAL;
}
ret = f->seek(pos);
// update new position
if (likely(!ret))
*poffset = pos;
return ret;
}
