v0.4.0

Errno v0.1.0

Decodes the errno value from a raw syscall result.

Package: Linux

Signature

func Errno(result: int64) -> int64;

Parameters

Name	Type	Description
`result`	`int64`	Raw syscall return value.

Returns

int64 — the positive errno value when result is between -4095 and -1, or 0 when the value does not encode an error.

Description

Errno does not read or modify a global or thread-local errno variable. It only decodes the supplied kernel return value.

Call IsError when you need to distinguish success from failure. Errno(result) == 0 means the input was not an encoded syscall error.

Example

import Linux::{ Errno, IsError, Write };

func Main() -> int {
    let result = Write(fd, data, length);
    if IsError(result) {
        let errorNumber = Errno(result);
    }
    return 0;
}