[thirdparty/squid.git] / src / Instance.h

/*
 * Copyright (C) 1996-2023 The Squid Software Foundation and contributors
 *
 * Squid software is distributed under GPLv2+ license and includes
 * contributions from numerous individuals and organizations.
 * Please see the COPYING and CONTRIBUTORS files for details.
 */

#ifndef SQUID_INSTANCE_H
#define SQUID_INSTANCE_H

#if HAVE_SYS_TYPES_H
#include <sys/types.h>
#endif

/// code related to Squid Instance and PID file management
namespace Instance {

/// Usually throws if another Squid instance is running. False positives are
/// highly unlikely, but the caller must tolerate false negatives well:
/// We may not detect another running instance and, hence, may not throw.
/// Does nothing if PID file maintenance is disabled.
void ThrowIfAlreadyRunning();

/// Creates or updates the PID file for the current process.
/// Does nothing if PID file maintenance is disabled.
void WriteOurPid();

/// \returns another Squid instance PID
/// Throws if PID file maintenance is disabled.
pid_t Other();

} // namespace Instance

#endif
Commit	Line	Data
e99fa721	1	/*
b8ae064d	2	* Copyright (C) 1996-2023 The Squid Software Foundation and contributors
e99fa721 EB	3	*
	4	* Squid software is distributed under GPLv2+ license and includes
	5	* contributions from numerous individuals and organizations.
	6	* Please see the COPYING and CONTRIBUTORS files for details.
	7	*/
	8
	9	#ifndef SQUID_INSTANCE_H
	10	#define SQUID_INSTANCE_H
	11
	12	#if HAVE_SYS_TYPES_H
	13	#include <sys/types.h>
	14	#endif
	15
	16	/// code related to Squid Instance and PID file management
	17	namespace Instance {
	18
	19	/// Usually throws if another Squid instance is running. False positives are
	20	/// highly unlikely, but the caller must tolerate false negatives well:
	21	/// We may not detect another running instance and, hence, may not throw.
	22	/// Does nothing if PID file maintenance is disabled.
	23	void ThrowIfAlreadyRunning();
	24
	25	/// Creates or updates the PID file for the current process.
	26	/// Does nothing if PID file maintenance is disabled.
	27	void WriteOurPid();
	28
	29	/// \returns another Squid instance PID
	30	/// Throws if PID file maintenance is disabled.
	31	pid_t Other();
	32
	33	} // namespace Instance
	34
	35	#endif
	36