#include "squid.h"
#include "base/File.h"
#include "debug/Messages.h"
#include "fs_io.h"
#include "Instance.h"
#include "md5.h"
#include "parser/Tokenizer.h"
#include "sbuf/Stream.h"
#include "SquidConfig.h"
#include "tools.h"
#include <cerrno>

Include dependency graph for Instance.cc:

Functions
static SBuf	PidFilenameCalc ()

static SBuf	PidFileDescription (const SBuf &filename)

static SBuf	PidFilename ()

static pid_t	GetOtherPid (File &pidFile)

static bool	ProcessIsRunning (const pid_t pid)
	determines whether a given process is running at the time of the call

static void	ThrowIfAlreadyRunningWith (File &pidFile)
	quits if another Squid instance (that owns the given PID file) is running

static void	RemoveInstance ()
	atexit() handler; removes the PID file created with Instance::WriteOurPid()

static SBuf	PidFilenameHash ()

Variables
static SBuf	TheFile

static SBuf	ThePidFileToRemove
	ties Instance::WriteOurPid() scheduler and RemoveInstance(void) handler

Function Documentation

◆ GetOtherPid()

static pid_t GetOtherPid ( File & pidFile )

static

Returns: the PID of another Squid instance (or throws)

Definition at line 70 of file Instance.cc.

References CharacterSet::CR, debugs, CharacterSet::LF, File::readSmall(), TexcHere, TheFile, and ToSBuf().

Referenced by Instance::Other(), and ThrowIfAlreadyRunningWith().

◆ PidFileDescription()

static SBuf PidFileDescription ( const SBuf & filename )

static

Returns: PID file description for debugging messages and error reporting

Definition at line 53 of file Instance.cc.

References ToSBuf().

Referenced by PidFilename(), and RemoveInstance().

◆ PidFilename()

static SBuf PidFilename ( )

static

Instance entry points are expected to call this first.

Returns: PidFilenameCalc() result while updating TheFile context

Definition at line 61 of file Instance.cc.

References PidFileDescription(), PidFilenameCalc(), and TheFile.

Referenced by Instance::Other(), Instance::ThrowIfAlreadyRunning(), and Instance::WriteOurPid().

◆ PidFilenameCalc()

static SBuf PidFilenameCalc ( )

static

PidFilename() helper

Returns: PID file name or, if PID signaling was disabled, an empty SBuf

Definition at line 31 of file Instance.cc.

References SBuf::append(), SquidConfig::chroot_dir, Chrooted, Config, debugs, and SquidConfig::pidFilename.

Referenced by PidFilename(), and PidFilenameHash().

◆ PidFilenameHash()

static SBuf PidFilenameHash ( )

static

A hash that is likely to be unique across instances running on the same host because such concurrent instances should use unique PID filenames. All instances with disabled PID file maintenance have the same hash value.