add gamescope support for proc_mem and io_read/write

src/iostats.cpp

@@ -1,6 +1,7 @@
 #include "iostats.h"
 #include "string_utils.h"
 #include <fstream>
+#include "hud_elements.h"
 
 struct iostats g_io_stats;
 
@@ -11,9 +12,22 @@ void getIoStats(iostats& io) {
     io.prev.read_bytes  = io.curr.read_bytes;
     io.prev.write_bytes = io.curr.write_bytes;
 
-    std::string line;
-    std::ifstream f("/proc/self/io");
-    while (std::getline(f, line)) {
+    std::string f = "/proc/";
+
+    {
+        auto gs_pid = HUDElements.g_gamescopePid;
+        f += gs_pid < 1 ? "self" : std::to_string(gs_pid);
+        f += "/io";
+    }
+
+    std::ifstream file(f);
+
+    if (!file.is_open()) {
+        SPDLOG_ERROR("can't open {}", f);
+        return;
+    }
+
+    for (std::string line; std::getline(file, line);) {
         if (starts_with(line, "read_bytes:")) {
             try_stoull(io.curr.read_bytes, line.substr(12));
         }

src/memory.cpp

@@ -6,6 +6,7 @@
 #include <array>
 
 #include "memory.h"
+#include "hud_elements.h"
 
 float memused, memmax, swapused;
 uint64_t proc_mem_resident, proc_mem_shared, proc_mem_virt;
@@ -35,10 +36,18 @@ void update_procmem()
     auto page_size = sysconf(_SC_PAGESIZE);
     if (page_size < 0) page_size = 4096;
 
-    std::ifstream file("/proc/self/statm");
+    std::string f = "/proc/";
+
+    {
+        auto gs_pid = HUDElements.g_gamescopePid;
+        f += gs_pid < 1 ? "self" : std::to_string(gs_pid);
+        f += "/statm";
+    }
+
+    std::ifstream file(f);
 
     if (!file.is_open()) {
-        SPDLOG_ERROR("can't open /proc/self/statm");
+        SPDLOG_ERROR("can't open {}", f);
         return;
     }