Create a utility class to handle pid files.
This allows somebody to check, write and delete pid files
for use in mediating processes.
The Check routine will attempt to read a pid file and
then check if the pid is in use. The write routine will
delete the current pid file and write a new pid to the file.
The delete routine simply deletes the old pid file.
libkea_util_la_SOURCES += encode/binary_from_base16.h
libkea_util_la_SOURCES += random/qid_gen.h random/qid_gen.cc
libkea_util_la_SOURCES += random/random_number_generator.h
+libkea_util_la_SOURCES += pid.h pid.cc
libkea_util_la_LIBADD = $(top_builddir)/src/lib/exceptions/libkea-exceptions.la
CLEANFILES = *.gcno *.gcda
--- /dev/null
+// Copyright (C) 2015 Internet Systems Consortium, Inc. ("ISC")
+//
+// Permission to use, copy, modify, and/or distribute this software for any
+// purpose with or without fee is hereby granted, provided that the above
+// copyright notice and this permission notice appear in all copies.
+//
+// THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
+// REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
+// AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
+// INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
+// LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
+// OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
+// PERFORMANCE OF THIS SOFTWARE.
+
+#include <util/pid.h>
+#include <cstdio>
+#include <signal.h>
+
+namespace isc {
+namespace util {
+
+pidFile::pidFile(const std::string& filename)
+ : filename_(filename) {
+}
+
+bool
+pidFile::check() {
+ boost::shared_ptr<std::ifstream> fs;
+ int pid;
+ bool good;
+
+ fs.reset(new std::ifstream(filename_.c_str()));
+
+ // If we weren't able to open the file treat
+ // it as if the process wasn't running
+ if (fs->is_open() == false) {
+ fs.reset();
+ return (false);
+ }
+
+ // Try to get the pid, get the status and get rid of the file
+ *fs >> pid;
+ good = fs->good();
+ fs->close();
+ fs.reset();
+
+ // Treat being unable to read a pid the same as if we
+ // got a pid and the process is still running.
+ if ((good == false) || (kill(pid, 0) == 0)) {
+ return (true);
+ }
+
+ // No process
+ return (false);
+}
+
+void
+pidFile::write() {
+ write(getpid());
+}
+
+void
+pidFile::write(int pid) {
+ boost::shared_ptr<std::ofstream> fs;
+
+ fs.reset(new std::ofstream(filename_.c_str()));
+ if (fs->is_open() == false) {
+ fs.reset();
+ isc_throw(pidFileError, "Unable to open PID file '"
+ << filename_ << "' for write");
+ }
+
+ // File is open, write the pid.
+ *fs << pid << std::endl;
+
+ // That's it
+ fs->close();
+ fs.reset();
+}
+
+void
+pidFile::deleteFile() {
+ if (remove(filename_.c_str()) != 0) {
+ isc_throw(pidFileError, "Unable to delete PID file '"
+ << filename_ << "'");
+ }
+}
+
+} // namespace isc::util
+} // namespace isc
+
--- /dev/null
+// Copyright (C) 2015 Internet Systems Consortium, Inc. ("ISC")
+//
+// Permission to use, copy, modify, and/or distribute this software for any
+// purpose with or without fee is hereby granted, provided that the above
+// copyright notice and this permission notice appear in all copies.
+//
+// THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
+// REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
+// AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
+// INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
+// LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
+// OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
+// PERFORMANCE OF THIS SOFTWARE.
+
+#ifndef PID_H
+#define PID_H
+
+#include <exceptions/exceptions.h>
+#include <boost/lexical_cast.hpp>
+#include <boost/shared_ptr.hpp>
+#include <fstream>
+#include <ostream>
+#include <string>
+
+namespace isc {
+namespace util {
+
+/// @brief Exception thrown when an error occurs during PID file processing.
+class pidFileError : public Exception {
+public:
+ pidFileError(const char* file, size_t line, const char* what) :
+ isc::Exception(file, line, what) { };
+};
+
+/// @brief Class to help with processing PID files
+///
+/// This is a utility class to manipulate PID files. It provides
+/// functiosn for writing and deleting a file containing a PID as
+/// well as for extracting a PID from a file and checking if the
+/// process is still running.
+
+class pidFile {
+public:
+ /// @brief Constructor
+ ///
+ /// @param filename PID filename.
+ pidFile(const std::string& filename);
+
+ /// @brief Destructor
+ ~pidFile();
+
+ /// @brief Read the PID in from the file and check it.
+ ///
+ /// Read the PID in from the file then use it to see if
+ /// a process with that PID exists. If the file doesn't
+ /// exist treat it as the process not being there.
+ /// If the file exists but can't be read or it doesn't
+ /// the proper format treat it as the process existing.
+ ///
+ /// @return true if the PID is in use, false otherwise
+ bool check();
+
+ /// @brief Write the PID to the file.
+ void write(int);
+
+ /// @brief Get PID of the proces and write it to the file.
+ void write();
+
+ /// @brief Delete the file.
+ void deleteFile();
+
+ /// @brief Returns the path to the PID file.
+ std::string getFilename() const {
+ return (filename_);
+ }
+
+private:
+ /// @brief PID filename
+ std::string filename_;
+};
+
+} // namespace isc::util
+} // namespace isc
+
+#endif // PID_H
+
+
run_unittests_SOURCES += time_utilities_unittest.cc
run_unittests_SOURCES += range_utilities_unittest.cc
run_unittests_SOURCES += signal_set_unittest.cc
+run_unittests_SOURCES += pid_unittest.cc
run_unittests_CPPFLAGS = $(AM_CPPFLAGS) $(GTEST_INCLUDES)
run_unittests_LDFLAGS = $(AM_LDFLAGS) $(GTEST_LDFLAGS)
--- /dev/null
+// Copyright (C) 2015 Internet Systems Consortium, Inc. ("ISC")
+//
+// Permission to use, copy, modify, and/or distribute this software for any
+// purpose with or without fee is hereby granted, provided that the above
+// copyright notice and this permission notice appear in all copies.
+//
+// THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
+// REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
+// AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
+// INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
+// LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
+// OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
+// PERFORMANCE OF THIS SOFTWARE.
+
+#include <util/pid.h>
+
+namespace {
+using namespace isc::util;
+
+} // end of anonymous namespace
+
projects / thirdparty / kea.git / commitdiff
