Function openat

components/dfs/dfs_v2/src/dfs_posix.c:110–152

* @brief Opens a file relative to a directory file descriptor. * * @param dirfd The file descriptor of the directory to base the relative path on. * @param path The path to the file to be opened, relative to the directory specified by `dirfd`. * Can be an absolute path (in which case `dirfd` is ignored). * @param flag File access and status flags (e.g., `O_RDONLY`, `O_WRONLY`,

 *
 */
int openat(int dirfd, const char *path, int flag, ...)
{
    struct dfs_file *d;
    char *fullpath;
    int fd;

    if (!path)
    {
        rt_set_errno(-EBADF);
        return -1;
    }

    fullpath = (char*)path;

    if (path[0] != '/')
    {
        if (dirfd != AT_FDCWD)
        {
            d = fd_get(dirfd);
            if (!d || !d->vnode)
            {
                rt_set_errno(-EBADF);
                return -1;
            }

            fullpath = dfs_dentry_full_path(d->dentry);
            if (!fullpath)
            {
                rt_set_errno(-ENOMEM);
                return -1;
            }
        }
    }

    fd = open(fullpath, flag, 0);

    if (fullpath != path)
    {
        rt_free(fullpath);
    }

    return fd;
}

int utimensat(int __fd, const char *__path, const struct timespec __times[2], int __flags)
{