typedef enum { ... } SilcSFTPFileOperation

    SFTP protocol file operation flags.  These enumerations can be used
    by the client when client is opening an file, to indicate how it
    would like to open the file.

    typedef enum {
      SILC_SFTP_FXF_READ           = 0x00000001, /* Reading */
      SILC_SFTP_FXF_WRITE          = 0x00000002, /* Writing */
      SILC_SFTP_FXF_APPEND         = 0x00000004, /* Appending to end of file */
      SILC_SFTP_FXF_CREAT          = 0x00000008, /* Create if doesn't exist */
      SILC_SFTP_FXF_TRUNC          = 0x00000010, /* Truncate if exists */
      SILC_SFTP_FXF_EXCL           = 0x00000020, /* Don't create if exists */
    } SilcSFTPFileOperation;