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| Current File : //proc/3/task/3/cwd/usr/local/ssl/include/isc/resource.h |
/*
* Copyright (C) 2004-2008 Internet Systems Consortium, Inc. ("ISC")
* Copyright (C) 2000, 2001 Internet Software Consortium.
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
* REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
* AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
* INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
* LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
* OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
* PERFORMANCE OF THIS SOFTWARE.
*/
/* $Id: resource.h,v 1.13 2008-07-11 23:47:09 tbox Exp $ */
#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 */
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