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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 http://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)ISC_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 ISC_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 */