-- @param flag1 First Flag ["append", "creat", "excl", "nonblock", "ndelay",
-- "sync", "trunc", "rdonly", "wronly", "rdwr"]
-- @param ... More Flags [-"-]
--- @return flag to be used as second paramter to open
+-- @return flag to be used as second parameter to open
--- Duplicate a file descriptor.
-- @class function
--- Wait for some event on a file descriptor.
-- poll() sets the revents-field of the tables provided by fds to a bitfield
--- indicating the events that occured.
+-- indicating the events that occurred.
-- @class function
-- @usage This function works in-place on the provided table and only
-- writes the revents field, you can use other fields on your demand.
--- Set or unset a environment variable.
-- @class function
-- @name nixio.setenv
--- @usage The environment variable will be unset if value is ommited.
+-- @usage The environment variable will be unset if value is omitted.
-- @param variable Variable
-- @param value Value (optional)
-- @return true