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J. Nick Koston
b9541cd5db
Replace the separate closed_ bool with fd_ < 0 as the 'not open'
sentinel. close() now sets fd_ = -1 after the underlying close call,
so the destructor and double-close paths just check fd_ < 0. As a
side benefit, get_fd() on a closed socket now returns -1, making
use-after-close visible to callers instead of returning a stale
descriptor.
Drop loop_monitored_ on the USE_LWIP_FAST_SELECT path — the pointer
cached_sock_ already encodes monitoring state (non-null iff
monitored). On USE_HOST the bool is still needed because there is no
cached pointer to derive from.
Combined effect on the fast-select path:
Before: fd_(4) + cached_sock_(4) + closed_(1) + loop_monitored_(1)
+ pad(2) = 12 bytes per socket
After: fd_(4) + cached_sock_(4)
= 8 bytes per socket (aligned, no tail padding)
Saves 4 bytes per Socket instance on ESP32/LibreTiny. With typical
workloads running 5-10 sockets (API listen + clients + mDNS) that's
20-40 bytes of RAM.
