samiandClaude Sonnet 5
6d7c4f7bc4
Introduces the four rpc-layer seams docs/08-porting.md calls for this lane: platform::Wakeup (eventfd), platform::peer_of (SO_PEERCRED/struct ucred, same-UID check preserved unchanged), platform::acquire_instance_lock (abstract-namespace socket), platform::runtime_base_dir/data_base_dir (XDG lookups). Today's Linux code moves unchanged into daemon/src/rpc/platform/linux/; the seam headers carry no OS types and no #ifdef. No fifth interface for timerfd: EventLoop gains a portable add_timer() that folds the next deadline into poll()'s own timeout, replacing both timerfd instances in main.cpp — the loop already computes a deadline, so this needs no per-OS backend at all. Full suite 59/59 green; no #ifdef outside platform/linux/, no behaviour change. Co-Authored-By: Claude Sonnet 5 <[email protected]>
39 lines
1.3 KiB
C++
39 lines
1.3 KiB
C++
#include "rpc/platform/instance_lock.hpp"
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#include <cstddef>
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#include <cstring>
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#include <sys/socket.h>
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#include <sys/un.h>
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#include <unistd.h>
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#include "util/crypto.hpp"
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namespace velox::daemon::rpc::platform {
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int acquire_instance_lock(const std::string& runtime_dir) {
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const int fd = ::socket(AF_UNIX, SOCK_STREAM | SOCK_CLOEXEC, 0);
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if (fd < 0) return -1;
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// Truncated to 16 hex chars (64 bits): a collision would need two distinct runtime
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// dirs to hash together, which is not a security boundary here — the socket itself is
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// still 0600 same-UID-checked; this is only "don't let two daemons stomp each other".
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const std::string name =
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"velox-daemon-" + velox::daemon::crypto::sha256_hex(runtime_dir).substr(0, 16);
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sockaddr_un addr{};
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addr.sun_family = AF_UNIX;
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// Leading NUL selects the abstract namespace; the name follows, not NUL-terminated.
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addr.sun_path[0] = '\0';
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std::memcpy(addr.sun_path + 1, name.c_str(), name.size());
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const socklen_t len =
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static_cast<socklen_t>(offsetof(sockaddr_un, sun_path) + 1 + name.size());
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if (::bind(fd, reinterpret_cast<sockaddr*>(&addr), len) != 0) {
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::close(fd);
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return -1;
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}
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return fd;
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}
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} // namespace velox::daemon::rpc::platform
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