Function errno [src]

Obtains errno from the return value of a system function call. For some systems this will obtain the value directly from the syscall return value; for others it will use a thread-local errno variable. Therefore, this function only returns a well-defined value when it is called directly after the system function call whose errno value is intended to be observed.

Prototype

pub fn errno(rc: anytype) E

Source

  pub fn errno(rc: anytype) E {
    if (use_libc) {
        return if (rc == -1) @enumFromInt(std.c._errno().*) else .SUCCESS;
    }
    const signed: isize = @bitCast(rc);
    const int = if (signed > -4096 and signed < 0) -signed else 0;
    return @enumFromInt(int);
}  