90 lines
3.0 KiB
Zig
90 lines
3.0 KiB
Zig
//! /system/tests/vfs-test — a ring-3 client that proves the kernel VFS end to
|
|
//! end through the plain `runtime.fs` API: resolve its OWN binary under the
|
|
//! kernel-served /system mount, check its metadata, read its ELF magic, and
|
|
//! list /system/services. On success it heartbeats "vfstest: ok" so the kernel
|
|
//! test can observe it; on failure it reports what went wrong.
|
|
//!
|
|
//! The "park" role (the fat-client-death test): open a file on the FAT volume,
|
|
//! then hold the handle forever without closing — the kill and the fat
|
|
//! server's release-on-death sweep are the point.
|
|
|
|
const std = @import("std");
|
|
const runtime = @import("runtime");
|
|
const fs = runtime.fs;
|
|
|
|
pub fn main(init: runtime.process.Init) void {
|
|
if (init.arguments.count > 1) {
|
|
park();
|
|
return;
|
|
}
|
|
|
|
// Our own binary, resolved through the kernel mount table.
|
|
const self_path = "/system/tests/vfs-test";
|
|
var file = fs.open(self_path, .{}) orelse {
|
|
_ = runtime.system.write("vfstest: open of own binary failed\n");
|
|
return;
|
|
};
|
|
defer file.close();
|
|
|
|
const attributes = file.attributes() orelse {
|
|
_ = runtime.system.write("vfstest: attributes failed\n");
|
|
return;
|
|
};
|
|
if (attributes.kind != .regular or attributes.size == 0) {
|
|
_ = runtime.system.write("vfstest: bad attributes\n");
|
|
return;
|
|
}
|
|
|
|
var header: [4]u8 = undefined;
|
|
const n = file.read(&header) orelse 0;
|
|
if (n != 4 or header[0] != 0x7f or header[1] != 'E' or header[2] != 'L' or header[3] != 'F') {
|
|
_ = runtime.system.write("vfstest: ELF magic mismatch\n");
|
|
return;
|
|
}
|
|
|
|
// The write refusal: /system is read-only by construction.
|
|
if (file.write("x") != null or fs.open("/system/tests/new-file", .{ .create = true }) != null) {
|
|
_ = runtime.system.write("vfstest: /system accepted a write\n");
|
|
return;
|
|
}
|
|
|
|
// Listing: /system/services contains init.
|
|
var saw_init = false;
|
|
if (fs.openDirectory("/system/services")) |listing| {
|
|
var directory = listing;
|
|
defer directory.close();
|
|
var entry: fs.Entry = .{};
|
|
while (directory.next(&entry)) {
|
|
if (std.mem.eql(u8, entry.name(), "init")) saw_init = true;
|
|
}
|
|
}
|
|
if (!saw_init) {
|
|
_ = runtime.system.write("vfstest: /system/services listing missed init\n");
|
|
return;
|
|
}
|
|
|
|
while (true) {
|
|
_ = runtime.system.write("vfstest: ok\n");
|
|
runtime.system.sleep(1000);
|
|
}
|
|
}
|
|
|
|
fn park() void {
|
|
// The storage chain (usb -> block -> fat -> mounts) takes a few seconds;
|
|
// retry until the volume appears.
|
|
var parked: ?fs.File = null;
|
|
var tries: u32 = 0;
|
|
while (parked == null and tries < 1000) : (tries += 1) {
|
|
parked = fs.open("/mnt/usb/parked", .{ .create = true });
|
|
if (parked == null) runtime.system.sleep(20);
|
|
}
|
|
if (parked == null) {
|
|
_ = runtime.system.write("vfstest: park open failed\n");
|
|
return;
|
|
}
|
|
while (true) {
|
|
_ = runtime.system.write("vfstest: parked\n");
|
|
runtime.system.sleep(500);
|
|
}
|
|
}
|