45 lines
1.5 KiB
Zig
45 lines
1.5 KiB
Zig
//! system/services/shm-server — the receiving half of the shm test (docs/display-v2.md V2).
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//! It registers under `ServiceId.shm_test`; when `shm-client` calls it carrying a
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//! shared-memory capability, it `shm_map`s that capability and checks the client's pattern
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//! is visible through the mapping — proving the two processes share the same physical pages
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//! (not a copy). On success it prints `shm: shared 4096 bytes ok`, the test's marker.
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const runtime = @import("runtime");
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const system = runtime.system;
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const shm = runtime.shm;
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const ipc = runtime.ipc;
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const pattern_len = 4096;
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/// The pattern the client writes — must match shm-client.zig.
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fn expected(i: usize) u8 {
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return @truncate(i *% 7 +% 3);
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}
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fn onMessage(message: []const u8, reply: []u8, sender: u32, capability: ?ipc.Handle) usize {
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_ = message;
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_ = reply;
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_ = sender;
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const cap = capability orelse {
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_ = system.write("shm: shared FAILED (no capability)\n");
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return 0;
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};
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const ptr = shm.map(cap) orelse {
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_ = system.write("shm: shared FAILED (map)\n");
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return 0;
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};
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var i: usize = 0;
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while (i < pattern_len) : (i += 1) {
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if (ptr[i] != expected(i)) {
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_ = system.write("shm: shared FAILED (mismatch)\n");
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return 0;
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}
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}
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_ = system.write("shm: shared 4096 bytes ok\n");
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return 0; // empty reply — the client only needs the round trip to unblock
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}
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pub fn main() void {
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runtime.service.run(64, .{ .service = .shm_test, .on_message = onMessage });
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}
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