Function open

components/dfs/dfs_v2/src/dfs_posix.c:48–88

* this function is a POSIX compliant version, which will open a file and * return a file descriptor according specified flags. * * @param file the path name of file. * @param flags the file open flags. Common values include: * - Access modes (mutually exclusive): * - `O_RDONLY`: Open for read-only access. * - `O_WRONLY`: Open for write-only access. * - `O_RDWR`:

 * @return the non-negative integer on successful open, others for failed.
 */
int open(const char *file, int flags, ...)
{
    int fd, result;
    struct dfs_file *df = RT_NULL;
    mode_t mode = 0;

    if (file == NULL)
    {
        rt_set_errno(-EBADF);
        return -1;
    }

    if ((flags & O_CREAT) || (flags & O_TMPFILE) == O_TMPFILE)
    {
        va_list ap;
        va_start(ap, flags);
        mode = va_arg(ap, mode_t);
        va_end(ap);
    }

    fd = fd_new();
    if (fd >= 0)
    {
        df = fd_get(fd);
    }
    else
    {
        rt_set_errno(-RT_ERROR);
        return RT_NULL;
    }

    result = dfs_file_open(df, file, flags, mode);
    if (result < 0)
    {
        fd_release(fd);
        rt_set_errno(result);
        return -1;
    }

    return fd;
}
RTM_EXPORT(open);

#ifndef AT_FDCWD