[PATCH] ntdll: Implement ProcessVmCounters for Linux.

[Alex Henrie]

For https://bugs.winehq.org/show_bug.cgi?id=5657

The implementation is based on similar code in dlls/kernel32/heap.c for
GlobalMemoryStatusEx.

We have to use /proc/self/status for this because it's the only file in
/proc/self that reports the current process's swapfile usage.

Signed-off-by: Alex Henrie <alexhenrie24 at gmail.com>
---
 dlls/ntdll/process.c | 28 ++++++++++++++++++++++++++++
 1 file changed, 28 insertions(+)

diff --git a/dlls/ntdll/process.c b/dlls/ntdll/process.c
index adff826b51..72376de9bf 100644
--- a/dlls/ntdll/process.c
+++ b/dlls/ntdll/process.c
@@ -131,6 +131,34 @@ static void fill_VM_COUNTERS(VM_COUNTERS* pvmi)
 #endif
 }
 
+#elif defined(linux)
+
+static void fill_VM_COUNTERS(VM_COUNTERS* pvmi)
+{
+    FILE *f;
+    char line[256];
+    unsigned long value;
+
+    f = fopen("/proc/self/status", "r");
+    if (!f) return;
+
+    while (fgets(line, sizeof(line), f))
+    {
+        if (sscanf(line, "VmPeak: %lu", &value))
+            pvmi->PeakVirtualSize = (ULONG64)value * 1024;
+        else if (sscanf(line, "VmSize: %lu", &value))
+            pvmi->VirtualSize = (ULONG64)value * 1024;
+        else if (sscanf(line, "VmHWM: %lu", &value))
+            pvmi->PeakWorkingSetSize = (ULONG64)value * 1024;
+        else if (sscanf(line, "VmRSS: %lu", &value))
+            pvmi->WorkingSetSize = (ULONG64)value * 1024;
+        else if (sscanf(line, "VmSwap: %lu", &value))
+            pvmi->PeakPagefileUsage = pvmi->PagefileUsage = (ULONG64)value * 1024;
+    }
+
+    fclose(f);
+}
+
 #else
 
 static void fill_VM_COUNTERS(VM_COUNTERS* pvmi)
-- 
2.12.0