opt_ctx

An option context created by mtaOptionStart(). A NULL value is permitted for this argument. When a NULL is passed, then no option value is returned.

name

Name of the option to obtain the value for. The length of this string should not exceed ALFA_SIZE bytes. This string must be NULL terminated if a value of zero is passed for len.

len

Length in bytes, not including any NULL terminator, of the option name supplied with name. If a value of zero is supplied, then the option name string must be NULL terminated. 

val

Pointer to an integer of type int to receive the option’s value. If the option was not specified in the option file, then the value referenced by this pointer will be left unchanged.