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net::tcp/udp: fix docs about how set_nonblocking is implemented#155284

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RalfJung wants to merge 1 commit intorust-lang:mainfrom
RalfJung:net-nonblocking
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net::tcp/udp: fix docs about how set_nonblocking is implemented#155284
RalfJung wants to merge 1 commit intorust-lang:mainfrom
RalfJung:net-nonblocking

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@RalfJung
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fcntl FIONBIO doesn't even make sense, it should be fcntl F_SETFL. However, for some reason we are using ioctl by default -- except on Solaris where this doesn't seem to work very well.

Honestly what I would have expected is that we just always use FileDesc::set_nonblocking also for network sockets, but for some reason we don't and there are no comments explaining this choice. Cc @nikarh (for "vita") @joboet

@rustbot rustbot added S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. T-libs Relevant to the library team, which will review and decide on the PR/issue. labels Apr 14, 2026
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rustbot commented Apr 14, 2026

r? @Mark-Simulacrum

rustbot has assigned @Mark-Simulacrum.
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The reviewer was selected based on:

  • Owners of files modified in this PR: @ChrisDenton, libs
  • @ChrisDenton, libs expanded to 8 candidates
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