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TR 24731-1 introduces the new type errno_t that is defined to be type int in errno.h and elsewhere. Many of the functions defined in TR 24731-1 return values of this type. The errno_t type should be used as the type of an object that may only contain values that might be found in errno. For example, a function that returns the value of errno should be declared as having the return type errno_t.
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Search for vulnerabilities resulting from the violation of this rule on the CERT website.
Related Guidelines
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| TR 24731-1:2007 | |
| ISO/IEC TR 24772 | "NZN Returning error status" |
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| MISRA-C | Rule 20.5 |
Bibliography
| [ISO/IEC 9899:2011] | Section 6.7.6.3, "Function Declarators (including prototypes)" |
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| [Open Group 2004] |