Errno v0.1.0
Extracts the positive errno from a raw syscall result.
Package: MacOS
Signature
func Errno(result: int64) -> int64;
Parameters
| Name | Type | Description |
|---|---|---|
result | int64 | Raw syscall return value. |
Returns
int64 - the positive errno (1 through 4095) when result is a negative
errno in the range -1 through -4095, or 0 for any other value, which the
package treats as success.
Errno does not read or modify a global or thread-local errno variable. It
negates the result when IsError reports one, and returns 0
otherwise.
Example
import MacOS::{ Close, Errno };
func Main() -> int {
let code = Errno(Close(3));
if code != 0i64 {
// The close failed with errno `code`.
}
return 0;
}
See also
MacOS— the package overviewIsError- test whether a result is an errorSyscall0–Syscall6- raw syscall entry points