From: Bernard Ladenthin <bernard@ladenthin.net>
Subject: kernel32/time: Implement GetSystemTimes for linux.
Message-Id: <52473347.8080300@ladenthin.net>
Date: Sat, 28 Sep 2013 21:51:35 +0200

---
 dlls/kernel32/time.c |  149
++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 149 insertions(+)


diff --git a/dlls/kernel32/time.c b/dlls/kernel32/time.c
index a1875f4..e8e9f35 100644
--- a/dlls/kernel32/time.c
+++ b/dlls/kernel32/time.c
@@ -20,6 +20,7 @@
 
 #include "config.h"
 
+#include <stdio.h>
 #include <string.h>
 #ifdef HAVE_UNISTD_H
 # include <unistd.h>
@@ -1077,9 +1078,157 @@ BOOL WINAPI FileTimeToDosDateTime( const FILETIME *ft, LPWORD fatdate,
  */
 BOOL WINAPI GetSystemTimes(LPFILETIME lpIdleTime, LPFILETIME lpKernelTime, LPFILETIME lpUserTime)
 {
+#ifdef linux
+    unsigned long long sumLpIdleTime, sumKernelTime, sumUserTime;
+    float idleTime, kernelTime, userTime;
+
+    FILE *fp;
+    int successfulValues;
+    unsigned int numCPUs;
+    const char* STAT = "/proc/stat";
+    const unsigned int factor = 10000;
+
+    // description from PROC(5): proc - process information pseudo-filesystem
+    unsigned long long
+    cpu_user,       // Time spent in user mode.
+
+    cpu_nice,       // Time spent in user mode with low priority (nice).
+
+    cpu_sys,        // Time spent in system mode.
+
+    cpu_idle,       // Time spent in the idle task. This value
+                    // should be USER_HZ times the second entry in the
+                    // /proc/uptime pseudo-file.
+
+    cpu_iowait,     // Time waiting for I/O to complete. (since Linux 2.5.41)
+
+    cpu_hardirq,    // Time servicing interrupts. (since Linux 2.6.0-test4)
+
+    cpu_softirq,    // Time servicing softirqs. (since Linux 2.6.0-test4)
+
+    cpu_steal,      // Stolen time, which is the time spent in
+                    // other operating systems when running in a
+                    // virtualized environment. (since Linux 2.6.11)
+
+    cpu_guest,      // Time spent running a virtual CPU for guest
+                    // operating systems under the control of the Linux kernel.
+                    // (since Linux 2.6.24)
+
+    cpu_guest_nice; // Time spent running a niced guest (virtual
+                    // CPU for guest operating systems under the
+                    // control of the Linux kernel). (since Linux 2.6.33)
+
+    // enough for the first /proc/stat lines
+    char line[4096];
+
+    if(!(fp = fopen(STAT, "r"))) {
+        SetLastError(ERROR_FILE_NOT_FOUND);
+        goto error;
+    }
+
+    // read the cpu summary line
+    if(!fgets(line, sizeof(line), fp)) {
+        SetLastError(ERROR_BAD_FORMAT);
+        goto closefileanderror;
+    }
+
+    if(strncmp(line, "cpu ", 4) != 0) {
+        goto closefileanderror;
+    }
+
+    // All the fields don't necessarily exist, depending on the kernel version used.
+    cpu_user =
+    cpu_nice =
+    cpu_sys =
+    cpu_idle =
+    cpu_iowait =
+    cpu_hardirq =
+    cpu_softirq =
+    cpu_steal =
+    cpu_guest =
+    cpu_guest_nice = 0;
+
+    successfulValues = sscanf(
+        line + 5,
+        "%llu %llu %llu %llu %llu %llu %llu %llu %llu %llu",
+
+        &cpu_user,
+        &cpu_nice,
+        &cpu_sys,
+        &cpu_idle,
+        &cpu_iowait,
+        &cpu_hardirq,
+        &cpu_softirq,
+        &cpu_steal,
+        &cpu_guest,
+        &cpu_guest_nice
+    );
+
+    numCPUs = 0;
+    for(;;) {
+        if(!fgets(line, sizeof(line), fp)) {
+            SetLastError(ERROR_BAD_FORMAT);
+            goto closefileanderror;
+        }
+
+        if(strncmp(line, "cpu", 3) != 0) {
+            break;
+        } else {
+            ++numCPUs;
+        }
+    }
+
+    if(fclose(fp) !=0) {
+        SetLastError(ERROR_INVALID_HANDLE);
+        goto error;
+    }
+
+    if(successfulValues < 8) {
+        SetLastError(ERROR_BAD_FORMAT);
+        goto error;
+    }
+
+    // cpu_user/cpu_nice already include cpu_guest/cpu_guest_nice.
+    // Times are multiplied by the number of processors.
+    sumLpIdleTime = cpu_idle;
+    sumKernelTime = cpu_sys + sumLpIdleTime + cpu_iowait +
+        cpu_hardirq + cpu_softirq + cpu_steal;
+    sumUserTime = cpu_user + cpu_nice;
+
+    idleTime = sumLpIdleTime;
+    idleTime /= factor * numCPUs;
+
+    kernelTime = sumKernelTime;
+    kernelTime /= factor * numCPUs;
+
+    userTime = sumUserTime;
+    userTime /= factor * numCPUs;
+
+    lpIdleTime->dwHighDateTime = idleTime;
+    lpIdleTime->dwLowDateTime = MAXDWORD;
+    lpIdleTime->dwLowDateTime *= idleTime-(int)idleTime;
+
+    lpKernelTime->dwHighDateTime = kernelTime;
+    lpKernelTime->dwLowDateTime = MAXDWORD;
+    lpKernelTime->dwLowDateTime *= kernelTime-(int)kernelTime;
+
+    lpUserTime->dwHighDateTime = userTime;
+    lpUserTime->dwLowDateTime = MAXDWORD;
+    lpUserTime->dwLowDateTime *= userTime-(int)userTime;
+
+    return TRUE;
+
+    closefileanderror:
+    if(fclose(fp) !=0) {
+        SetLastError(ERROR_INVALID_HANDLE);
+    }
+    error:
+    return FALSE;
+#else
     FIXME("(%p,%p,%p): Stub!\n", lpIdleTime, lpKernelTime, lpUserTime);
 
     return FALSE;
+#endif
 }
 
 /***********************************************************************


-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.4.12 (GNU/Linux)
Comment: Using GnuPG with Icedove - http://www.enigmail.net/

iQEcBAEBAgAGBQJSRzNHAAoJEO0NlEC/FI7ShVsIALpP7hMZs4ZmG1iw/XiqILm/
KdRUlNKYcZVCqkr5bYGGmue87R0JVrhY8NUjkjuBWpdfMIiYxqnCg+8vbjiZHORy
ef5QQTEHrW21GPvISCtr+ugr+YHjEa1PMcu5aYfSwKDOjtlZN56JvkS0c7n8LHnx
vA8UOYxnWa4nq4Pd0FWU6jK/hflvN3pBkubExNqe6cyXtz7+h7peTMEHBRMfG3dq
beR5vnFVDyGlSQjBO9vK1E40eCeNhhYtGI+soWH2RbeeDQafU2jlewSVdlVX6aHs
VzkpR16RAa3bOp4CdIECSXeUN/YjgqULTCsaCbJKAdtP5f5U9NnOJxo7Nz6W1KM=
=ZFny
-----END PGP SIGNATURE-----