Add AF_UNIX sockets implementation - #11681
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AF_UNIX pathname binding and descriptor passing require DFSv2 socket nodes and retained open file descriptions across fd tables. Add socket-node creation for tmpfs and devtmpfs, fd reference helpers, and socket F_SETFL forwarding. Impact: DFSv2 socket nodes and descriptor reference handling. Validation: git diff --cached --check.
Local IPC protocol families do not have a backing network device. Store the selected provider in each SAL socket and add a local provider registry while preserving netdev checks for Internet sockets. Handle DFSv2 close semantics, socketpair flags, and MSG_CTRUNC for AF_UNIX integration. Impact: SAL protocol dispatch for all socket families. Validation: git diff --cached --check.
Musl AF_UNIX addresses and ancillary data require explicit ABI and user-memory conversion at the LWP syscall boundary. Add the musl msghdr layout, bounded address and message copying, control-message level conversion, and MSG_CTRUNC translation. Correct receive buffer allocation and copy lengths while handling messages. Impact: LWP socket syscalls when SAL is enabled. Validation: git diff --cached --check.
Add an opt-in AF_UNIX provider for pathname-based local IPC without a synthetic network device. Support datagram and stream sockets, blocking and nonblocking I/O, timeouts, poll, socketpair, and SCM_RIGHTS descriptor passing. Include bounded Kconfig settings, component documentation, and utest coverage. Impact: enabled only by RT_USING_AF_UNIX and requires SAL POSIX with DFSv2. Validation: git diff --cached --check.
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📌 Code Review Assignment🏷️ Tag: componentsReviewers: @Maihuanyi Changed Files (Click to expand)
🏷️ Tag: components_lwpReviewers: @xu18838022837 Changed Files (Click to expand)
📊 Current Review Status (Last Updated: 2026-08-03 09:50 CST)
📝 Review Instructions
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Apply the repository clang-format rules to the affected source lines. Suppress the cppcheck false positive for the devtmpfs list iterator. No functional behavior is changed.
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拉取/合并请求描述：(PR description)
[
为什么提交这份PR (why to submit this PR)
RT-Thread SAL currently expects socket protocol providers to be backed by a
network device. This model does not fit local IPC protocols.
Applications such as BusyBox
syslogdandloggerrely on pathname-baseAF_UNIX sockets, typically through
/dev/log. This PR adds native AF_UNIXsupport without introducing a synthetic network device.
你的解决方案是什么 (what is your solution)
S_IFSOCKnodes in tmpfs and devtmpfs.SCM_RIGHTSdescriptor passing.sockaddr_unmsghdrMSG_CTRUNCcomponents/net/af_unixprovider supporting:SOCK_DGRAMandSOCK_STREAMsocketpairSCM_RIGHTSdescriptor passing请提供验证的bsp和config (provide the config and bsp)
]
当前拉取/合并请求的状态 Intent for your PR
必须选择一项 Choose one (Mandatory):
代码质量 Code Quality：
我在这个拉取/合并请求中已经考虑了 As part of this pull request, I've considered the following:
#if 0代码，不包含已经被注释了的代码 All redundant code is removed and cleaned up