 
                            This appendix contains guidelines for functions that are defined as part of the POSIX family of standards but are not included in ISO/IEC 9899-1999the C Standard. These rules and recommendations are not part of the core standard because they do not apply in all C language applications and because they represent an incomplete set. The intent of providing these guidelines is to demonstrate how rules and recommendations for other standards or specific implementations may be integrated with the core C99 C recommendations.
Recommendations
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Rules
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Risk Assessment Summary
| Recommendation Rule | Severity | Likelihood | Detectable | Repairable Remediation Cost | Priority | Level | ||||
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| POS00POS30-C | High | Probable medium | probable Yes | high Yes | P4 P18 | L3 L1 POS01 | ||||
| POS34-C | High | medium Unlikely | likely Yes | high No | P6 | L2 POS02 | ||||
| POS35-C | High | Likely high | likely No | high No | P9 P9 | L2 | ||||
| POS03-C | medium | probable | medium | P12 | L1 | |||||
| Rule | Severity | Likelihood | Remediation Cost | Priority | Level | |||||
| POS36-C | High | Probable | Yes | Yes | P18 | L1 | ||||
| POS37-C | High | Probable | Yes | Yes | P18 | L1 | ||||
| POS38-C | Medium | Unlikely | No | No | P2 | L3 | ||||
| POS39-C | Medium | Likely | Yes | No | POS30-C | high | probable | medium | P12 | L1 POS31 | 
| POS44-C | Low | Probable medium | probable No | high No | P4 P2 | L3 POS32 | ||||
| POS47-C | Medium | medium Probable | probable No | medium No | P8 P4 | L2 L3 POS33 | ||||
| POS48-C | Medium | Probable low | probable No | low No | P6 P4 | L2 L3 POS34 | ||||
| POS49-C | Medium | high Probable | unlikely No | medium No | P6 P4 | L2 L3 POS35 | ||||
| POS50-C | Medium | high Probable | likely No | medium No | P18 P4 | L1 L3 POS36 | ||||
| POS51-C | Low | Probable high | probable No | medium No | P12 P2 | L1 L3 POS37 | ||||
| POS52-C | Low | high Probable | probable No | low No | P18 P2 | L1 L3 POS38 | ||||
| POS53-C | Medium | Probable medium | unlikely Yes | medium No | P2 P8 | L3 L2 POS40 | ||||
| POS54-C | High | medium Likely | probable Yes | high Yes | P4 P27 | L3 L1 | 
Related Rules and Recommendations
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CERT C Secure Coding Standard POS00-C. Avoid race conditions with multiple threads