QPID-1951: Removed need for Windows versions of ssize_t and pid_t

- Trivially removed Windows uses of ssize_t
- Rearchitected how the Windows port finds an existing qpidd to stop it
- Split Posix Lockfile functionality using pids into a new PidFile class

git-svn-id: https://svn.apache.org/repos/asf/qpid/trunk/qpid@890929 13f79535-47bb-0310-9956-ffa450edef68

4 files changed, 98 insertions, 60 deletions

diff --git a/cpp/src/qpid/sys/LockFile.h b/cpp/src/qpid/sys/LockFile.h
index 1f0a9e13b3..14a76cbf3e 100644
--- a/cpp/src/qpid/sys/LockFile.h
+++ b/cpp/src/qpid/sys/LockFile.h
@@ -29,7 +29,7 @@
 namespace qpid {
 namespace sys {
 
-class LockFilePrivate;    
+class LockFilePrivate;
 
 /**
  * @class LockFile
@@ -43,34 +43,17 @@ class LockFilePrivate;
  */
 class LockFile : private boost::noncopyable
 {
-    boost::shared_ptr<LockFilePrivate> impl;
-
     std::string path;
     bool created;
+    boost::shared_ptr<LockFilePrivate> impl;
+
+protected:
+    int read(void*, size_t) const;
+    int write(void*, size_t) const;
 
 public:
     QPID_COMMON_EXTERN LockFile(const std::string& path_, bool create);
     QPID_COMMON_EXTERN ~LockFile();
-
-    /**
-     * Read the process ID from the lock file. This method assumes that
-     * if there is a process ID in the file, it was written there by
-     * writePid(); thus, it's at the start of the file.
-     *
-     * Throws an exception if there is an error reading the file.
-     *
-     * @returns The stored process ID. No validity check is done on it.
-     */
-    QPID_COMMON_EXTERN pid_t readPid(void) const;
-
-    /**
-     * Write the current process's ID to the lock file. It's written at
-     * the start of the file and will overwrite any other content that
-     * may be in the file.
-     *
-     * Throws an exception if the write fails.
-     */
-    QPID_COMMON_EXTERN void writePid(void);
 };
  
 }}   /* namespace qpid::sys */
diff --git a/cpp/src/qpid/sys/posix/LockFile.cpp b/cpp/src/qpid/sys/posix/LockFile.cpp
index 4900252984..1862ff6ac9 100755
--- a/cpp/src/qpid/sys/posix/LockFile.cpp
+++ b/cpp/src/qpid/sys/posix/LockFile.cpp
@@ -17,6 +17,7 @@
  */
 
 #include "qpid/sys/LockFile.h"
+#include "qpid/sys/posix/PidFile.h"
 
 #include <string>
 #include <unistd.h>
@@ -31,6 +32,7 @@ namespace sys {
 
 class LockFilePrivate {
     friend class LockFile;
+    friend class PidFile;
 
     int fd;
 
@@ -64,27 +66,43 @@ LockFile::~LockFile() {
     }
 }
 
-pid_t LockFile::readPid(void) const {
+int LockFile::read(void* bytes, size_t len) const {
     if (!impl)
-        throw Exception("Lock file not open");
+        throw Exception("Lock file not open: " + path);
 
-    pid_t pid;
-    int desired_read = sizeof(pid_t);
-    if (desired_read > ::read(impl->fd, &pid, desired_read) ) {
-        throw Exception("Cannot read lock file " + path);
+    ssize_t rc = ::read(impl->fd, bytes, len);
+    if ((ssize_t)len > rc) {
+        throw Exception("Cannot read lock file: " + path);
     }
-    return pid;
+    return rc;
 }
 
-void LockFile::writePid(void) {
+int LockFile::write(void* bytes, size_t len) const {
     if (!impl)
-        throw Exception("Lock file not open");
+        throw Exception("Lock file not open: " + path);
+
+    ssize_t rc = ::write(impl->fd, bytes, len);
+    if ((ssize_t)len > rc) {
+        throw Exception("Cannot write lock file: " + path);
+    }
+    return rc;
+}
+
+PidFile::PidFile(const std::string& path_, bool create):
+    LockFile(path_, create)
+{}
 
+pid_t PidFile::readPid(void) const {
+    pid_t pid;
+    int desired_read = sizeof(pid_t);
+    read(&pid, desired_read);
+    return pid;
+}
+
+void PidFile::writePid(void) {
     pid_t pid = getpid();
     int desired_write = sizeof(pid_t);
-    if (desired_write > ::write(impl->fd, &pid, desired_write)) {
-        throw Exception("Cannot write lock file " + path);
-    }
+    write(&pid, desired_write);
 }
  
 }}  /* namespace qpid::sys */
diff --git a/cpp/src/qpid/sys/posix/PidFile.h b/cpp/src/qpid/sys/posix/PidFile.h
new file mode 100644
index 0000000000..fb19d407f4
--- /dev/null
+++ b/cpp/src/qpid/sys/posix/PidFile.h
@@ -0,0 +1,62 @@
+#ifndef _sys_PidFile_h
+#define _sys_PidFile_h
+
+/*
+ *
+ * Copyright (c) 2008 The Apache Software Foundation
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+#include "qpid/sys/LockFile.h"
+
+#include "qpid/CommonImportExport.h"
+#include "qpid/sys/IntegerTypes.h"
+
+#include <boost/noncopyable.hpp>
+#include <boost/shared_ptr.hpp>
+#include <string>
+
+namespace qpid {
+namespace sys {
+
+class PidFile : public LockFile
+{
+public:
+    QPID_COMMON_EXTERN PidFile(const std::string& path_, bool create);
+
+    /**
+     * Read the process ID from the lock file. This method assumes that
+     * if there is a process ID in the file, it was written there by
+     * writePid(); thus, it's at the start of the file.
+     *
+     * Throws an exception if there is an error reading the file.
+     *
+     * @returns The stored process ID. No validity check is done on it.
+     */
+    QPID_COMMON_EXTERN pid_t readPid(void) const;
+
+    /**
+     * Write the current process's ID to the lock file. It's written at
+     * the start of the file and will overwrite any other content that
+     * may be in the file.
+     *
+     * Throws an exception if the write fails.
+     */
+    QPID_COMMON_EXTERN void writePid(void);
+};
+ 
+}}   /* namespace qpid::sys */
+
+#endif /*!_sys_PidFile_h*/
diff --git a/cpp/src/qpid/sys/windows/LockFile.cpp b/cpp/src/qpid/sys/windows/LockFile.cpp
index e9079b6094..e9fe01ca72 100755
--- a/cpp/src/qpid/sys/windows/LockFile.cpp
+++ b/cpp/src/qpid/sys/windows/LockFile.cpp
@@ -56,29 +56,4 @@ LockFile::~LockFile() {
     }
 }
 
-pid_t LockFile::readPid(void) const {
-    if (!impl)
-        throw Exception("Lock file not open");
-
-    pid_t pid;
-    DWORD desired_read = sizeof(pid_t);
-    DWORD actual_read = 0;
-    if (!ReadFile(impl->fd, &pid, desired_read, &actual_read, 0)) {
-        throw Exception("Cannot read lock file " + path);
-    }
-    return pid;
-}
-
-void LockFile::writePid(void) {
-    if (!impl)
-        throw Exception("Lock file not open");
-
-    pid_t pid = GetCurrentProcessId();
-    DWORD desired_write = sizeof(pid_t);
-    DWORD written = 0;
-    if (!WriteFile(impl->fd, &pid, desired_write, &written, 0)) {
-        throw Exception("Cannot write lock file " + path);
-    }
-}
- 
 }}  /* namespace qpid::sys */