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A return type of errno_t indicates that the function returns a status indicator . (See see DCL09-C. Declare functions that return errno with a return type of errno_t).)
This error-handling approach is secure, but it has the following drawbacks:
- Source and object code can significantly increase in size, perhaps by as much as 30 to 40 percent [Saks 2007b].
- All function return values must be checked . (See void MEM32see ERR33-C. Detect and handle memory allocation standard library errors).)
- Functions should not return other values if they return error indicators . (See see ERR02-C. Avoid in-band error indicators).)
- Any function that allocates resources must ensure they are freed in cases where errors occur.
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