What does errno 34 (ERANGE) mean?

Status / error code:		Category:

Constant name:
Source:		Operating System:
Description: A valid operation or conversion produced a result outside the destination type's representable range.

Could be also:
Constant	Type	OS
ERROR_WRONG_DISK	Win32 error	Windows
KERN_INVALID_MEMORY_CONTROL	Kern return	Mac
ippStsStreamEnd	Intel Ipp Status	Any
FILE_SYSTEM	BugCheck Code	Windows

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EDOM	EDEADLK

ERANGE

Valid input, unusable result

ERANGE usually indicates that an operation is meaningful, but its result cannot be represented by the destination type or interface. Mathematical functions can use it for overflow and underflow. A pole error, such as log(0), also produces this result because the exact mathematical result is an infinity.

The same error is not restricted to floating-point math. strtol() returns LONG_MAX or LONG_MIN and sets errno to this result when a parsed integer overflows or underflows long. A caller that only looks at the returned boundary value cannot distinguish a real boundary value from a conversion failure.

How it differs from EDOM

Condition	Meaning	Typical example
`EDOM`	The input lies outside the function’s domain.	`log(-1)` or a negative base with a nonintegral `pow()` exponent.
This result	The operation is defined, but the result does not fit the target representation.	Overflow in `pow()` or an out-of-range integer parsed by `strtol()`.

Checking and handling the condition

For integer conversion, set errno to zero before strtol(), keep the end-pointer result, and then test for it.
For mathematical functions, clear floating-point exceptions before the call and inspect FE_OVERFLOW, FE_UNDERFLOW, and FE_DIVBYZERO together with the function result and errno.
Choose deliberately between rejecting the input, storing a wider type, scaling the value, or applying a documented saturation rule. Silent clamping can conceal an earlier data or unit error.

References

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