Socket options¶

Use zlink_set_option() and zlink_get_option() for common raw-socket options. Router, dealer, stream, pub, and sub options use their typed accessors. An unsupported option returns ZLINK_CONFIG_NOT_SUPPORTED.

Configuration timing¶

Set routing ids, TLS credentials, transport buffers, and handshake-related values before bind or connect. Runtime queue options may affect existing pipes only as documented by the public contract.

Queue and timeout options¶

ZLINK_OPT_SNDHWM and ZLINK_OPT_RCVHWM bound the queued bytes. Values are uint64_t byte counts and 0 means unlimited. See the socket spec for the exact accounting and errors.
ZLINK_OPT_SNDTIMEO and ZLINK_OPT_RCVTIMEO bound blocking calls.
ZLINK_OPT_LINGER controls how close treats pending outbound data.
Automatic-HWM options select a profile and a per-message byte input.

Transport options¶

TCP keepalive, reconnect intervals, kernel send/receive buffers, TOS, and TLS settings affect transport behavior. Verify platform support before depending on an option.

Read the resulting automatic-HWM plan through zlink_monitor_status() rather than reconstructing the internal calculation in application code.