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A call to f() returns a status indicator which is zero upon success, and a non-zero value upon failure indicating what went wrong.
Wiki Markup errno_t}} indicates that the function returns a status indicator \[[indicator (see DCL09-A. Declare functions that return an errno error code with a return type of errno_t]\]).
While this solution is secure, it has the following drawbacks:
Wiki Markup Source and object code can significantly increase in size, perhaps by as much as 30-40% \[[Saks 07b|AA. C References#Saks 07b]\]
Wiki Markup - All function return values must be checked (see \[[MEM32-C. Detect and handle memory allocation errors]\] among many others.)
Wiki Markup Functions should not return other values if they return error indicators (see \[[ERR02-A. Avoid in-band error indicators]\].)
- Any function that allocates resources must ensure they are freed incases where errors occur.
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