1 files changed, 26 insertions, 0 deletions
diff --git a/vendor/libghostty-vt/src/os/cgroup.zig b/vendor/libghostty-vt/src/os/cgroup.zig
new file mode 100644
index 00000000..9e68a50f
--- /dev/null
+++ b/vendor/libghostty-vt/src/os/cgroup.zig
@@ -0,0 +1,26 @@
+const std = @import("std");
+
+const log = std.log.scoped(.@"linux-cgroup");
+
+/// Returns the path to the cgroup for the given pid.
+pub fn current(buf: []u8, pid: u32) ?[]const u8 {
+    var path_buf: [std.fs.max_path_bytes]u8 = undefined;
+
+    // Read our cgroup by opening /proc/<pid>/cgroup and reading the first
+    // line. The first line will look something like this:
+    // 0::/user.slice/user-1000.slice/session-1.scope
+    // The cgroup path is the third field.
+    const path = std.fmt.bufPrint(&path_buf, "/proc/{}/cgroup", .{pid}) catch return null;
+    const file = std.fs.openFileAbsolute(path, .{}) catch return null;
+    defer file.close();
+
+    var read_buf: [64]u8 = undefined;
+    var file_reader = file.reader(&read_buf);
+    const reader = &file_reader.interface;
+    const len = reader.readSliceShort(buf) catch return null;
+    const contents = buf[0..len];
+
+    // Find the last ':'
+    const idx = std.mem.lastIndexOfScalar(u8, contents, ':') orelse return null;
+    return std.mem.trimRight(u8, contents[idx + 1 ..], " \r\n");
+}