1 files changed, 178 insertions, 0 deletions
diff --git a/PC/VS9.0/kill_python.c b/PC/VS9.0/kill_python.c
new file mode 100644
index 0000000000..bb323d31d0
--- /dev/null
+++ b/PC/VS9.0/kill_python.c
@@ -0,0 +1,178 @@
+/*
+ * Helper program for killing lingering python[_d].exe processes before
+ * building, thus attempting to avoid build failures due to files being
+ * locked.
+ */
+
+#include <windows.h>
+#include <wchar.h>
+#include <tlhelp32.h>
+#include <stdio.h>
+
+#pragma comment(lib, "psapi")
+
+#ifdef _DEBUG
+#define PYTHON_EXE          (L"python_d.exe")
+#define PYTHON_EXE_LEN      (12)
+#define KILL_PYTHON_EXE     (L"kill_python_d.exe")
+#define KILL_PYTHON_EXE_LEN (17)
+#else
+#define PYTHON_EXE          (L"python.exe")
+#define PYTHON_EXE_LEN      (10)
+#define KILL_PYTHON_EXE     (L"kill_python.exe")
+#define KILL_PYTHON_EXE_LEN (15)
+#endif
+
+int
+main(int argc, char **argv)
+{
+    HANDLE   hp, hsp, hsm; /* process, snapshot processes, snapshot modules */
+    DWORD    dac, our_pid;
+    size_t   len;
+    wchar_t  path[MAX_PATH+1];
+
+    MODULEENTRY32W  me;
+    PROCESSENTRY32W pe;
+
+    me.dwSize = sizeof(MODULEENTRY32W);
+    pe.dwSize = sizeof(PROCESSENTRY32W);
+
+    memset(path, 0, MAX_PATH+1);
+
+    our_pid = GetCurrentProcessId();
+
+    hsm = CreateToolhelp32Snapshot(TH32CS_SNAPMODULE, our_pid);
+    if (hsm == INVALID_HANDLE_VALUE) {
+        printf("CreateToolhelp32Snapshot[1] failed: %d\n", GetLastError());
+        return 1;
+    }
+
+    if (!Module32FirstW(hsm, &me)) {
+        printf("Module32FirstW[1] failed: %d\n", GetLastError());
+        CloseHandle(hsm);
+        return 1;
+    }
+
+    /*
+     * Enumerate over the modules for the current process in order to find
+     * kill_process[_d].exe, then take a note of the directory it lives in.
+     */
+    do {
+        if (_wcsnicmp(me.szModule, KILL_PYTHON_EXE, KILL_PYTHON_EXE_LEN))
+            continue;
+
+        len = wcsnlen_s(me.szExePath, MAX_PATH) - KILL_PYTHON_EXE_LEN;
+        wcsncpy_s(path, MAX_PATH+1, me.szExePath, len); 
+
+        break;
+
+    } while (Module32NextW(hsm, &me));
+
+    CloseHandle(hsm);
+
+    if (path == NULL) {
+        printf("failed to discern directory of running process\n");
+        return 1;
+    }
+
+    /*
+     * Take a snapshot of system processes.  Enumerate over the snapshot,
+     * looking for python processes.  When we find one, verify it lives
+     * in the same directory we live in.  If it does, kill it.  If we're
+     * unable to kill it, treat this as a fatal error and return 1.
+     * 
+     * The rationale behind this is that we're called at the start of the 
+     * build process on the basis that we'll take care of killing any
+     * running instances, such that the build won't encounter permission
+     * denied errors during linking. If we can't kill one of the processes,
+     * we can't provide this assurance, and the build shouldn't start.
+     */
+
+    hsp = CreateToolhelp32Snapshot(TH32CS_SNAPPROCESS, 0);
+    if (hsp == INVALID_HANDLE_VALUE) {
+        printf("CreateToolhelp32Snapshot[2] failed: %d\n", GetLastError());
+        return 1;
+    }
+
+    if (!Process32FirstW(hsp, &pe)) {
+        printf("Process32FirstW failed: %d\n", GetLastError());
+        CloseHandle(hsp);
+        return 1;
+    }
+
+    dac = PROCESS_QUERY_INFORMATION | PROCESS_VM_READ | PROCESS_TERMINATE;
+    do {
+
+        /*
+         * XXX TODO: if we really wanted to be fancy, we could check the 
+         * modules for all processes (not just the python[_d].exe ones)
+         * and see if any of our DLLs are loaded (i.e. python33[_d].dll),
+         * as that would also inhibit our ability to rebuild the solution.
+         * Not worth loosing sleep over though; for now, a simple check 
+         * for just the python executable should be sufficient.
+         */
+
+        if (_wcsnicmp(pe.szExeFile, PYTHON_EXE, PYTHON_EXE_LEN))
+            /* This isn't a python process. */
+            continue;
+
+        /* It's a python process, so figure out which directory it's in... */
+        hsm = CreateToolhelp32Snapshot(TH32CS_SNAPMODULE, pe.th32ProcessID);
+        if (hsm == INVALID_HANDLE_VALUE)
+            /* 
+             * If our module snapshot fails (which will happen if we don't own
+             * the process), just ignore it and continue.  (It seems different
+             * versions of Windows return different values for GetLastError()
+             * in this situation; it's easier to just ignore it and move on vs.
+             * stopping the build for what could be a false positive.)
+             */
+             continue;
+
+        if (!Module32FirstW(hsm, &me)) {
+            printf("Module32FirstW[2] failed: %d\n", GetLastError());
+            CloseHandle(hsp);
+            CloseHandle(hsm);
+            return 1;
+        }
+
+        do {
+            if (_wcsnicmp(me.szModule, PYTHON_EXE, PYTHON_EXE_LEN))
+                /* Wrong module, we're looking for python[_d].exe... */
+                continue;
+
+            if (_wcsnicmp(path, me.szExePath, len))
+                /* Process doesn't live in our directory. */
+                break;
+
+            /* Python process residing in the right directory, kill it!  */
+            hp = OpenProcess(dac, FALSE, pe.th32ProcessID);
+            if (!hp) {
+                printf("OpenProcess failed: %d\n", GetLastError());
+                CloseHandle(hsp);
+                CloseHandle(hsm);
+                return 1;
+            }
+
+            if (!TerminateProcess(hp, 1)) {
+                printf("TerminateProcess failed: %d\n", GetLastError());
+                CloseHandle(hsp);
+                CloseHandle(hsm);
+                CloseHandle(hp);
+                return 1;
+            }
+
+            CloseHandle(hp);
+            break;
+
+        } while (Module32NextW(hsm, &me));
+
+        CloseHandle(hsm);
+
+    } while (Process32NextW(hsp, &pe));
+
+    CloseHandle(hsp);
+
+    return 0;
+}
+
+/* vi: set ts=8 sw=4 sts=4 expandtab */