@brief Update the configuration flags of a set of GPIO lines.
@param bulk Set of GPIO lines.
@param flags Replacement flags.
@return 0 is the operation succeeds. In case of an error this routine
returns -1 and sets the last error number.
If the lines were not previously requested together, the behavior is
undefined.
@brief Update the configuration flags of a set of GPIO lines. @param bulk Set of GPIO lines. @param flags Replacement flags. @return 0 is the operation succeeds. In case of an error this routine returns -1 and sets the last error number.
If the lines were not previously requested together, the behavior is undefined.