fix(hci): set code property to string errno in errors

[tommie]

Fixes stoprocent/noble#46 by adding back the property that was dropped in 59744ec.

[stoprocent]

Sorry but build is failing

[Apollon77]

it seems that "strerrorname_np" was introdiced in glibc 3.32, but we run a lower version here?

Alternative is (according to CLaude code I asked for advice) something like

// Add this helper function (e.g., at the top of the file or in a header)
const char* GetErrnoName(int err) {
    switch (err) {
        case EPERM: return "EPERM";
        case ENOENT: return "ENOENT";
        case ESRCH: return "ESRCH";
        case EINTR: return "EINTR";
        case EIO: return "EIO";
        case ENXIO: return "ENXIO";
        case E2BIG: return "E2BIG";
        case ENOEXEC: return "ENOEXEC";
        case EBADF: return "EBADF";
        case ECHILD: return "ECHILD";
        case EAGAIN: return "EAGAIN";
        case ENOMEM: return "ENOMEM";
        case EACCES: return "EACCES";
        case EFAULT: return "EFAULT";
        case ENOTBLK: return "ENOTBLK";
        case EBUSY: return "EBUSY";
        case EEXIST: return "EEXIST";
        case EXDEV: return "EXDEV";
        case ENODEV: return "ENODEV";
        case ENOTDIR: return "ENOTDIR";
        case EISDIR: return "EISDIR";
        case EINVAL: return "EINVAL";
        case ENFILE: return "ENFILE";
        case EMFILE: return "EMFILE";
        case ENOTTY: return "ENOTTY";
        case ETXTBSY: return "ETXTBSY";
        case EFBIG: return "EFBIG";
        case ENOSPC: return "ENOSPC";
        case ESPIPE: return "ESPIPE";
        case EROFS: return "EROFS";
        case EMLINK: return "EMLINK";
        case EPIPE: return "EPIPE";
        case EDOM: return "EDOM";
        case ERANGE: return "ERANGE";
        // Add more as needed for your use case
        default: return "UNKNOWN";
    }
}

...
    
    const char* errno_name = GetErrnoName(errno);
    

[tommie]

Oh, sorry, missed the progress here.

From Linux man, it seems strerrorname_np is a GNU extension, so perhaps that's a bad idea. BSD has sys_errlist, but it seems there's no POSIX function for it. And actually, Node has such a custom switch: https://github.com/nodejs/node/blob/a327288cc6747cf5e07656a1c45fe2f19e0926ae/src/node_errors.cc#L690

Doesn't seem to be exposed except through the ErrnoException constructor. I got the impression that dropping the use of NAN was a goal with the refactoring, but if that's not the case, we could go back to using nan::ErrnoException.

We could use errno --list from moreutils to generate a source file, if that's acceptable:

errno -l | awk 'BEGIN { print "const char *errno_string(void) {"; print "  switch (err) {" } { print "  case " $1 ": return \"" $1 "\";" } END { print "  default: return \"ERROR\";"; print "  }"; print "}" }'