Clarification Needed on Rule 20.12

[vijayendra]

Rule says not to use any functionality of and it is a Required rule.

How to use POSIX compliant timer APIs like timer_create, timer_settime etc is also defined in this header file?

[misra-c]

The MISRA C Guidelines recognise that it is sometimes necessary to use language features such as those in and provides a deviation mechanism to permit you to document the use of these features. Provided that you are familiar with the issues of the undefined, unspecified and implementation-defined behaviour associated with this header file then you should be able to construct a suitable deviation.

See also Rules 1.2 and 3.6.