mirror of
https://github.com/RetroShare/RetroShare.git
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0c6d24e007
git-svn-id: http://svn.code.sf.net/p/retroshare/code/trunk@268 b45a01b8-16f6-495d-af2f-9b41ad6348cc
125 lines
3.4 KiB
C++
125 lines
3.4 KiB
C++
/****************************************************************
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* This file is distributed under the following license:
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*
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* Copyright (c) 2006-2007, crypton
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* Copyright (c) 2006, Matt Edman, Justin Hipple
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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****************************************************************/
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#include <QDir>
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#include <QFile>
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#include <QTextStream>
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#include "string.h"
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#include "process.h"
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/** Returns the PID of the current process. */
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qint64
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get_pid()
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{
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#if defined(Q_OS_WIN)
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return (qint64)GetCurrentProcessId();
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#else
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return (qint64)getpid();
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#endif
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}
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/** Returns true if a process with the given PID is running. */
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bool
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is_process_running(qint64 pid)
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{
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#if defined(Q_OS_WIN)
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BOOL rc;
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DWORD exitCode;
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/* Try to open the process to see if it exists */
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HANDLE hProcess = OpenProcess(PROCESS_QUERY_INFORMATION, FALSE, (DWORD)pid);
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if (hProcess == NULL) {
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return false;
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}
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/* It exists, so see if it's still active or if it terminated already */
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rc = GetExitCodeProcess(hProcess, &exitCode);
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CloseHandle(hProcess);
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if (!rc) {
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/* Error. Assume it doesn't exist (is this a bad assumption?) */
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return false;
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}
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/* If GetExitCodeProcess() returns a non-zero value, and the process is
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* still running, exitCode should equal STILL_ACTIVE. Otherwise, this means
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* the process has terminated. */
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return (exitCode == STILL_ACTIVE);
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#else
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/* Send the "null" signal to check if a process exists */
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if (kill((pid_t)pid, 0) < 0) {
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return (errno != ESRCH);
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}
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return true;
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#endif
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}
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/** Writes the given file to disk containing the current process's PID. */
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bool
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write_pidfile(QString pidFileName, QString *errmsg)
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{
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/* Make sure the directory exists */
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QDir pidFileDir = QFileInfo(pidFileName).absoluteDir();
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if (!pidFileDir.exists()) {
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pidFileDir.mkpath(QDir::convertSeparators(pidFileDir.absolutePath()));
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}
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/* Try to open (and create if it doesn't exist) the pidfile */
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QFile pidfile(pidFileName);
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if (!pidfile.open(QIODevice::WriteOnly | QIODevice::Text)) {
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return err(errmsg, pidfile.errorString());
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}
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/* Write our current PID to it */
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QTextStream pidstream(&pidfile);
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pidstream << get_pid();
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return true;
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}
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/** Reads the given pidfile and returns the value contained in it. If the file
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* does not exist 0 is returned. Returns -1 if an error occurs. */
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qint64
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read_pidfile(QString pidFileName, QString *errmsg)
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{
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qint64 pid;
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/* Open the pidfile, if it exists */
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QFile pidfile(pidFileName);
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if (!pidfile.exists()) {
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return 0;
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}
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if (!pidfile.open(QIODevice::ReadOnly | QIODevice::Text)) {
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if (errmsg) {
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*errmsg = pidfile.errorString();
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}
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return -1;
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}
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/* Read the PID in from the file */
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QTextStream pidstream(&pidfile);
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pidstream >> pid;
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return pid;
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}
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