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/*
* Copyright (C) Internet Systems Consortium, Inc. ("ISC")
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, you can obtain one at https://mozilla.org/MPL/2.0/.
*
* See the COPYRIGHT file distributed with this work for additional
* information regarding copyright ownership.
*/
#ifndef ISC_RESOURCE_H
#define ISC_RESOURCE_H 1
/*! \file isc/resource.h */
#include <isc/lang.h>
#include <isc/types.h>
#define ISC_RESOURCE_UNLIMITED ((isc_resourcevalue_t)UINT64_MAX)
ISC_LANG_BEGINDECLS
isc_result_t
isc_resource_setlimit(isc_resource_t resource, isc_resourcevalue_t value);
/*%<
* Set the maximum limit for a system resource.
*
* Notes:
*\li If 'value' exceeds the maximum possible on the operating system,
* it is silently limited to that maximum -- or to "infinity", if
* the operating system has that concept. #ISC_RESOURCE_UNLIMITED
* can be used to explicitly ask for the maximum.
*
* Requires:
*\li 'resource' is a valid member of the isc_resource_t enumeration.
*
* Returns:
*\li #ISC_R_SUCCESS Success.
*\li #ISC_R_NOTIMPLEMENTED 'resource' is not a type known by the OS.
*\li #ISC_R_NOPERM The calling process did not have adequate permission
* to change the resource limit.
*/
isc_result_t
isc_resource_getlimit(isc_resource_t resource, isc_resourcevalue_t *value);
/*%<
* Get the maximum limit for a system resource.
*
* Notes:
*\li 'value' is set to the maximum limit.
*
*\li #ISC_RESOURCE_UNLIMITED is the maximum value of isc_resourcevalue_t.
*
*\li On many (all?) Unix systems, RLIM_INFINITY is a valid value that is
* significantly less than #ISC_RESOURCE_UNLIMITED, but which in practice
* behaves the same.
*
*\li The current ISC libdns configuration file parser assigns a value
* of UINT32_MAX for a size_spec of "unlimited" and ISC_UNIT32_MAX - 1
* for "default", the latter of which is supposed to represent "the
* limit that was in force when the server started". Since these are
* valid values in the middle of the range of isc_resourcevalue_t,
* there is the possibility for confusion over what exactly those
* particular values are supposed to represent in a particular context --
* discrete integral values or generalized concepts.
*
* Requires:
*\li 'resource' is a valid member of the isc_resource_t enumeration.
*
* Returns:
*\li #ISC_R_SUCCESS Success.
*\li #ISC_R_NOTIMPLEMENTED 'resource' is not a type known by the OS.
*/
isc_result_t
isc_resource_getcurlimit(isc_resource_t resource, isc_resourcevalue_t *value);
/*%<
* Same as isc_resource_getlimit(), but returns the current (soft) limit.
*
* Returns:
*\li #ISC_R_SUCCESS Success.
*\li #ISC_R_NOTIMPLEMENTED 'resource' is not a type known by the OS.
*/
ISC_LANG_ENDDECLS
#endif /* ISC_RESOURCE_H */
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