MythTV  master
Functions
mythmiscutil.cpp File Reference
#include "mythmiscutil.h"
#include <cerrno>
#include <cstdlib>
#include <ctime>
#include <iostream>
#include <unistd.h>
#include <fcntl.h>
#include <sched.h>
#include "compat.h"
#include <QReadWriteLock>
#include <QNetworkProxy>
#include <QStringList>
#include <QDataStream>
#include <QUdpSocket>
#include <QFileInfo>
#include <QFile>
#include <QDir>
#include <QUrl>
#include <QHostAddress>
#include "mythcorecontext.h"
#include "exitcodes.h"
#include "mythlogging.h"
#include "mythsocket.h"
#include "mythcoreutil.h"
#include "mythsystemlegacy.h"
#include "mythconfig.h"
Include dependency graph for mythmiscutil.cpp:

Go to the source code of this file.

Functions

bool getUptime (time_t &uptime)
 Returns uptime statistics. More...
 
bool getMemStats (int &totalMB, int &freeMB, int &totalVM, int &freeVM)
 Returns memory statistics in megabytes. More...
 
bool hasUtf8 (const char *str)
 Guess whether a string is UTF-8. More...
 
bool ping (const QString &host, int timeout)
 Can we ping host within timeout seconds? More...
 
bool telnet (const QString &host, int port)
 Can we talk to port on host? More...
 
long long copy (QFile &dst, QFile &src, uint block_size)
 Copies src file to dst file. More...
 
QString createTempFile (QString name_template, bool dir)
 
bool makeFileAccessible (const QString &filename)
 
QString getResponse (const QString &query, const QString &def)
 In an interactive shell, prompt the user to input a string. More...
 
int intResponse (const QString &query, int def)
 In an interactive shell, prompt the user to input a number. More...
 
QString getSymlinkTarget (const QString &start_file, QStringList *intermediaries, unsigned maxLinks)
 
bool IsMACAddress (const QString &MAC)
 
QString FileHash (const QString &filename)
 
bool WakeOnLAN (const QString &MAC)
 
bool MythWakeup (const QString &wakeUpCommand, uint flags, uint timeout)
 
bool IsPulseAudioRunning (void)
 Is A/V Sync destruction daemon is running on this host? More...
 
bool myth_nice (int val)
 
void myth_yield (void)
 
bool myth_ioprio (int)
 Allows setting the I/O priority of the current process/thread. More...
 
bool MythRemoveDirectory (QDir &aDir)
 
void setHttpProxy (void)
 Get network proxy settings from OS, and use for [Q]Http[Comms]. More...
 
void wrapList (QStringList &list, int width)
 
QString xml_indent (uint level)
 
int naturalCompare (const QString &_a, const QString &_b, Qt::CaseSensitivity caseSensitivity)
 

Function Documentation

◆ getUptime()

getUptime ( time_t &  uptime)

Returns uptime statistics.

Returns
true if successful, false otherwise.

Definition at line 63 of file mythmiscutil.cpp.

Referenced by StatusBox::doMachineStatus(), BaseRequestHandler::HandleQueryUptime(), MainServer::HandleQueryUptime(), and NetworkControl::processQuery().

◆ getMemStats()

getMemStats ( int &  totalMB,
int &  freeMB,
int &  totalVM,
int &  freeVM 
)

Returns memory statistics in megabytes.

Todo:
Memory Statistics are not supported (by MythTV) on NT or DOS.
Returns
true if it succeeds, false otherwise.

Definition at line 108 of file mythmiscutil.cpp.

Referenced by StatusBox::doMachineStatus(), BaseRequestHandler::HandleQueryMemStats(), MainServer::HandleQueryMemStats(), and NetworkControl::processQuery().

◆ hasUtf8()

bool hasUtf8 ( const char *  str)

Guess whether a string is UTF-8.

Note
This does not attempt to validate the whole string. It just checks if it has any UTF-8 sequences in it.

Definition at line 180 of file mythmiscutil.cpp.

◆ ping()

bool ping ( const QString &  host,
int  timeout 
)

Can we ping host within timeout seconds?

Different operating systems use different parameters to specify a timeout to the ping command. FreeBSD and derivatives use '-t'; Linux and derivatives use '-w'. Using the right parameter also eliminates the need for the old behavior of falling back to pinging the localhost with and without a timeout, in order to characterize whether the right parameter was used in the first place.

Note
If ping fails to timeout on another supported platform, determine what parameter that platform's ping requires to specify the timeout and add another case to the #ifdef statement.

Definition at line 232 of file mythmiscutil.cpp.

Referenced by setHttpProxy().

◆ telnet()

bool telnet ( const QString &  host,
int  port 
)

Can we talk to port on host?

Definition at line 263 of file mythmiscutil.cpp.

Referenced by setHttpProxy().

◆ copy()

copy ( QFile &  dst,
QFile &  src,
uint  block_size 
)

Copies src file to dst file.

If the dst file is open, it must be open for writing. If the src file is open, if must be open for reading.

The files will be in the same open or close state after this function runs as they were prior to this function being called.

This function does not care if the files are actual files. For compatibility with pipes and socket streams the file location will not be reset to 0 at the end of this function. If the function is successful the file pointers will be at the end of the copied data.

Parameters
dstDestination QFile
srcSource QFile
block_sizeOptional block size in bytes, must be at least 1024, otherwise the default of 16 KB will be used.
Returns
bytes copied on success, -1 on failure.

Definition at line 294 of file mythmiscutil.cpp.

Referenced by GalleryThumbView::Copy(), ImportMusicDialog::copyFile(), VideoOutput::CopyFrame(), mythburn::copyRemote(), mythburn::doProcessFile(), mythburn::doProcessFileProjectX(), VideoVisualGoom::Draw(), PrivateDecoderOMX::GetBufferedFrame(), mythburn::getFileInformation(), PrivateDecoderCrystalHD::GetFrame(), nv_python_libs.common.common_api.Common::getUrlData(), HLSStream::HLSStream(), ImportRecorder::Open(), mythburn::preProcessFile(), trail_space(), nv_python_libs.xsltfunctions.traileraddicts_api.xpathFunctions::traileraddictsLinkGenerationMovie(), and ThumbFinder::updateThumb().

◆ createTempFile()

QString createTempFile ( QString  name_template,
bool  dir 
)

Definition at line 351 of file mythmiscutil.cpp.

Referenced by DBUtil::CreateTemporaryDBConf(), and FillData::GrabData().

◆ makeFileAccessible()

bool makeFileAccessible ( const QString &  filename)

Definition at line 423 of file mythmiscutil.cpp.

Referenced by Content::GetPreviewImage(), and PreviewGenerator::SavePreview().

◆ getResponse()

QString getResponse ( const QString &  query,
const QString &  def 
)

In an interactive shell, prompt the user to input a string.

Definition at line 438 of file mythmiscutil.cpp.

Referenced by intResponse(), ChannelData::promptForChannelUpdates(), MythContextPrivate::PromptForDatabaseParams(), and SchemaUpgradeWizard::PromptForUpgrade().

◆ intResponse()

int intResponse ( const QString &  query,
int  def 
)

In an interactive shell, prompt the user to input a number.

Definition at line 468 of file mythmiscutil.cpp.

Referenced by MythContextPrivate::PromptForDatabaseParams().

◆ getSymlinkTarget()

QString getSymlinkTarget ( const QString &  start_file,
QStringList *  intermediaries,
unsigned  maxLinks 
)

◆ IsMACAddress()

bool IsMACAddress ( const QString &  MAC)

Definition at line 531 of file mythmiscutil.cpp.

Referenced by MythWakeup(), and Scheduler::WakeUpSlave().

◆ FileHash()

QString FileHash ( const QString &  filename)

◆ WakeOnLAN()

bool WakeOnLAN ( const QString &  MAC)

Definition at line 618 of file mythmiscutil.cpp.

Referenced by MythWakeup(), and Scheduler::WakeUpSlave().

◆ MythWakeup()

bool MythWakeup ( const QString &  wakeUpCommand,
uint  flags,
uint  timeout 
)

◆ IsPulseAudioRunning()

bool IsPulseAudioRunning ( void  )

Is A/V Sync destruction daemon is running on this host?

Definition at line 668 of file mythmiscutil.cpp.

Referenced by AudioOutput::OpenAudio(), and PulseHandler::Suspend().

◆ myth_nice()

bool myth_nice ( int  val)

◆ myth_yield()

void myth_yield ( void  )

Definition at line 700 of file mythmiscutil.cpp.

◆ myth_ioprio()

bool myth_ioprio ( int  )

Allows setting the I/O priority of the current process/thread.

range -1..8, smaller is higher priority

As of November 14th, 2010 this only works on Linux when using the CFQ I/O Scheduler. The range is -1 to 8, with -1 being real-time priority 0 through 7 being standard best-time priorities and 8 being the idle priority. The deadline and noop I/O Schedulers will ignore this but are much less likely to starve video playback to feed the transcoder or flagger. (noop is only recommended for SSDs.)

Since a process needs to have elevated priviledges to use either the real-time or idle priority this will try priorities 0 or 7 respectively if -1 or 8 do not work. It will not report an error on these conditions as they will be the common case.

Only Linux on i386, ppc, x86_64 and ia64 are currently supported. This is a no-op on all other architectures and platforms.

Definition at line 788 of file mythmiscutil.cpp.

Referenced by JobQueue::DoTranscodeThread(), JobQueue::DoUserJobThread(), MythSystemLegacyUnix::Fork(), and main().

◆ MythRemoveDirectory()

bool MythRemoveDirectory ( QDir &  aDir)

◆ setHttpProxy()

void setHttpProxy ( void  )

Get network proxy settings from OS, and use for [Q]Http[Comms].

The HTTP_PROXY environment var. is parsed for values like; "proxy-host", "proxy-host:8080", "http://host:8080" and "http"//user:password@host:1080", and that is used for any Qt-based Http fetches. We also test connectivity here with ping and telnet, and warn if it fails.

If there is was no env. var, we use Qt to get proxy settings from the OS, and search through them for a proxy server we can connect to.

Definition at line 836 of file mythmiscutil.cpp.

Referenced by main().

◆ wrapList()

void wrapList ( QStringList &  list,
int  width 
)

◆ xml_indent()

QString xml_indent ( uint  level)

◆ naturalCompare()

int naturalCompare ( const QString &  _a,
const QString &  _b,
Qt::CaseSensitivity  caseSensitivity 
)