openSocketPosix

fn openSocketPosix(
    family: posix.sa_family_t,
    options: IpAddress.BindOptions,
) error{
    AddressFamilyUnsupported,
    ProtocolUnsupportedBySystem,
    ProcessFdQuotaExceeded,
    SystemFdQuotaExceeded,
    SystemResources,
    ProtocolUnsupportedByAddressFamily,
    SocketModeUnsupported,
    OptionUnsupported,
    Unexpected,
    Canceled,
}!posix.socket_t {
    const mode, const protocol = try posixSocketModeProtocol(family, options.mode, options.protocol);
    const flags: u32 = mode | if (socket_flags_unsupported) 0 else posix.SOCK.CLOEXEC;
    const syscall: Syscall = try .start();
    const socket_fd = while (true) {
        const rc = posix.system.socket(family, flags, protocol);
        switch (posix.errno(rc)) {
            .SUCCESS => {
                syscall.finish();
                const fd: posix.fd_t = @intCast(rc);
                errdefer closeFd(fd);
                if (socket_flags_unsupported) try setCloexec(fd);
                break fd;
            },
            .INTR => {
                try syscall.checkCancel();
                continue;
            },
            .AFNOSUPPORT => return syscall.fail(error.AddressFamilyUnsupported),
            .INVAL => return syscall.fail(error.ProtocolUnsupportedBySystem),
            .MFILE => return syscall.fail(error.ProcessFdQuotaExceeded),
            .NFILE => return syscall.fail(error.SystemFdQuotaExceeded),
            .NOBUFS => return syscall.fail(error.SystemResources),
            .NOMEM => return syscall.fail(error.SystemResources),
            .PROTONOSUPPORT => return syscall.fail(error.ProtocolUnsupportedByAddressFamily),
            .PROTOTYPE => return syscall.fail(error.SocketModeUnsupported),
            else => |err| return syscall.unexpectedErrno(err),
        }
    };
    errdefer closeFd(socket_fd);

    if (options.ip6_only) |ip6_only| {
        if (posix.IPV6 == void) return error.OptionUnsupported;
        try setSocketOptionPosix(socket_fd, posix.IPPROTO.IPV6, posix.IPV6.V6ONLY, @intFromBool(ip6_only));
    }

    return socket_fd;
}