Increase maximum FD limit for socket FD transfer #6
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artemyarulin
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Dec 29, 2025
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See this thread https://wasmerio.slack.com/archives/C03BC51R5ST/p1767611911554809?thread_ts=1767015311.585489&cid=C03BC51R5ST, 32 might be not enough |
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artemyarulin
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Jan 12, 2026
- Add v2 Unix socket transfer framing (magic prefix + fd count + payload length) with chunked `SCM_RIGHTS` sends/receives to avoid ancillary truncation and short reads on streams. - Detect v2 via a leading 0 byte peek; otherwise dispatch to the legacy v1 path. - Preserve legacy behavior/limits (single recvmsg, 32 FD cap, 2048-byte payload buffer) for backward compatibility while allowing newer senders to use the flexible v2 format.
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The 32 limit is too conservative.