Example

In the following code example, the value of an option named max_blocks is retrieved. Before calling mtaOptionInt(), a default value is set for the variable to receive the value of the option. If the option was not specified in the option file, then the variable will retain that default setting. If the option was specified, then the variable will assume the value set in the file.

blocks = 1024;
mtaOptionInt(opt, "max_blocks", 0, &blocks);

The following code example illustrates how upon return from mtaOptionString(), the code determines that the option was specified by whether or not the value of the buflen variable has changed.

char buf[1];
size_t buflen;

buflen = 0xffffffff;
mtaOptionString(opt, "max_blocks", 0, buf, &buflen, sizeof(buf));
blocks_specified = (buflen != 0xffffffff) ? 1 : 0;