47 lines
1.7 KiB
Zig
47 lines
1.7 KiB
Zig
//! system/services/shared-memory-client — the creating half of the shared-memory test (docs/display-v2.md V2).
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//! It `shared_memory_create`s a shared region, writes a known pattern into it, and hands the region's
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//! capability to `shared-memory-server` as an `ipc_call` send_cap. The server maps that capability and
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//! confirms the pattern is visible — proving cross-process shared memory over the extended
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//! capability-passing path.
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const runtime = @import("runtime");
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const system = runtime.system;
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const shared_memory = runtime.shared_memory;
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const ipc = runtime.ipc;
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const pattern_len = 4096;
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/// The pattern the server checks — must match shared-memory-server.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 lookupServer() ?ipc.Handle {
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var attempts: usize = 0;
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while (attempts < 100) : (attempts += 1) {
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if (ipc.lookup(.shared_memory_test)) |h| return h;
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system.sleep(50);
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}
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return null;
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}
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pub fn main() void {
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const region = shared_memory.create(pattern_len) orelse {
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_ = system.write("shared-memory: create failed\n");
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return;
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};
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var i: usize = 0;
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while (i < pattern_len) : (i += 1) region.ptr[i] = expected(i);
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const server = lookupServer() orelse {
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_ = system.write("shared-memory: no server\n");
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return;
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};
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// A non-empty message (so it reaches on_message, not the ping path), carrying the shared-memory
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// region's capability. The reply is empty; we just need the round trip.
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var reply: [64]u8 = undefined;
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_ = ipc.callCap(server, "shared-memory", &reply, region.handle) catch {
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_ = system.write("shared-memory: call failed\n");
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};
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}
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