689 lines
16 KiB
C
689 lines
16 KiB
C
![]() |
/*
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* CDDL HEADER START
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*
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* The contents of this file are subject to the terms of the
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* Common Development and Distribution License, Version 1.0 only
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* (the "License"). You may not use this file except in compliance
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* with the License.
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*
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* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
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* or http://www.opensolaris.org/os/licensing.
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* See the License for the specific language governing permissions
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* and limitations under the License.
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*
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* When distributing Covered Code, include this CDDL HEADER in each
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* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
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* If applicable, add the following below this CDDL HEADER, with the
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* fields enclosed by brackets "[]" replaced with your own identifying
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* information: Portions Copyright [yyyy] [name of copyright owner]
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*
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* CDDL HEADER END
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*/
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/*
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* Copyright 2004 Sun Microsystems, Inc. All rights reserved.
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* Use is subject to license terms.
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*/
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/*
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* Portions Copyright 2006 OmniTI, Inc.
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*/
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/* #pragma ident "@(#)envvar.c 1.5 05/06/08 SMI" */
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#include "config.h"
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#include <ctype.h>
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#include <errno.h>
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#include <limits.h>
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#include <stdlib.h>
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#include <string.h>
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#if HAVE_DLFCN_H
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#include <dlfcn.h>
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#endif
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#include "umem_base.h"
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#include "vmem_base.h"
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/*
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* A umem environment variable, like UMEM_DEBUG, is set to a series
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* of items, seperated by ',':
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*
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* UMEM_DEBUG="audit=10,guards,firewall=512"
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*
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* This structure describes items. Each item has a name, type, and
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* description. During processing, an item read from the user may
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* be either "valid" or "invalid".
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*
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* A valid item has an argument, if required, and it is of the right
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* form (doesn't overflow, doesn't contain any unexpected characters).
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*
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* If the item is valid, item_flag_target != NULL, and:
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* type is not CLEARFLAG, then (*item_flag_target) |= item_flag_value
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* type is CLEARFLAG, then (*item_flag_target) &= ~item_flag_value
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*/
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#define UMEM_ENV_ITEM_MAX 512
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struct umem_env_item;
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typedef int arg_process_t(const struct umem_env_item *item, const char *value);
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#define ARG_SUCCESS 0 /* processing successful */
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#define ARG_BAD 1 /* argument had a bad value */
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typedef struct umem_env_item {
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const char *item_name; /* tag in environment variable */
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const char *item_interface_stability;
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enum {
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ITEM_INVALID,
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ITEM_FLAG, /* only a flag. No argument allowed */
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ITEM_CLEARFLAG, /* only a flag, but clear instead of set */
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ITEM_OPTUINT, /* optional integer argument */
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ITEM_UINT, /* required integer argument */
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ITEM_OPTSIZE, /* optional size_t argument */
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ITEM_SIZE, /* required size_t argument */
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ITEM_SPECIAL /* special argument processing */
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} item_type;
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const char *item_description;
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uint_t *item_flag_target; /* the variable containing the flag */
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uint_t item_flag_value; /* the value to OR in */
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uint_t *item_uint_target; /* the variable to hold the integer */
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size_t *item_size_target;
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arg_process_t *item_special; /* callback for special handling */
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} umem_env_item_t;
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#ifndef UMEM_STANDALONE
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static arg_process_t umem_backend_process;
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#endif
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static arg_process_t umem_log_process;
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const char *____umem_environ_msg_options = "-- UMEM_OPTIONS --";
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static umem_env_item_t umem_options_items[] = {
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#ifndef UMEM_STANDALONE
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{ "backend", "Evolving", ITEM_SPECIAL,
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"=sbrk for sbrk(2), =mmap for mmap(2)",
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NULL, 0, NULL, NULL,
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&umem_backend_process
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},
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#endif
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{ "concurrency", "Private", ITEM_UINT,
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"Max concurrency",
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NULL, 0, &umem_max_ncpus
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},
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{ "max_contention", "Private", ITEM_UINT,
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"Maximum contention in a reap interval before the depot is "
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"resized.",
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NULL, 0, &umem_depot_contention
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},
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{ "nomagazines", "Private", ITEM_FLAG,
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"no caches will be multithreaded, and no caching will occur.",
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&umem_flags, UMF_NOMAGAZINE
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},
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{ "reap_interval", "Private", ITEM_UINT,
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"Minimum time between reaps and updates, in seconds.",
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NULL, 0, &umem_reap_interval
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},
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#ifndef _WIN32
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#ifndef UMEM_STANDALONE
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{ "sbrk_pagesize", "Private", ITEM_SIZE,
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"The preferred page size for the sbrk(2) heap.",
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NULL, 0, NULL, &vmem_sbrk_pagesize
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},
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#endif
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#endif
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{ NULL, "-- end of UMEM_OPTIONS --", ITEM_INVALID }
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};
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const char *____umem_environ_msg_debug = "-- UMEM_DEBUG --";
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static umem_env_item_t umem_debug_items[] = {
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{ "default", "Unstable", ITEM_FLAG,
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"audit,contents,guards",
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&umem_flags,
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UMF_AUDIT | UMF_CONTENTS | UMF_DEADBEEF | UMF_REDZONE
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},
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{ "audit", "Unstable", ITEM_OPTUINT,
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"Enable auditing. optionally =frames to set the number of "
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"stored stack frames",
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&umem_flags, UMF_AUDIT, &umem_stack_depth
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},
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{ "contents", "Unstable", ITEM_OPTSIZE,
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"Enable contents storing. UMEM_LOGGING=contents also "
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"required. optionally =bytes to set the number of stored "
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"bytes",
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&umem_flags, UMF_CONTENTS, NULL, &umem_content_maxsave
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},
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{ "guards", "Unstable", ITEM_FLAG,
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"Enables guards and special patterns",
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&umem_flags, UMF_DEADBEEF | UMF_REDZONE
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},
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{ "verbose", "Unstable", ITEM_FLAG,
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"Enables writing error messages to stderr",
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&umem_output, 1
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},
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{ "nosignal", "Private", ITEM_FLAG,
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"Abort if called from a signal handler. Turns on 'audit'. "
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"Note that this is not always a bug.",
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&umem_flags, UMF_AUDIT | UMF_CHECKSIGNAL
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},
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{ "firewall", "Private", ITEM_SIZE,
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"=minbytes. Every object >= minbytes in size will have its "
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"end against an unmapped page",
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&umem_flags, UMF_FIREWALL, NULL, &umem_minfirewall
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},
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{ "lite", "Private", ITEM_FLAG,
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"debugging-lite",
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&umem_flags, UMF_LITE
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},
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{ "maxverify", "Private", ITEM_SIZE,
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"=maxbytes, Maximum bytes to check when 'guards' is active. "
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"Normally all bytes are checked.",
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NULL, 0, NULL, &umem_maxverify
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},
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{ "noabort", "Private", ITEM_CLEARFLAG,
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"umem will not abort when a recoverable error occurs "
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"(i.e. double frees, certain kinds of corruption)",
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&umem_abort, 1
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},
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{ "mtbf", "Private", ITEM_UINT,
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"=mtbf, the mean time between injected failures. Works best "
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"if prime.\n",
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NULL, 0, &umem_mtbf
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},
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{ "random", "Private", ITEM_FLAG,
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"randomize flags on a per-cache basis",
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&umem_flags, UMF_RANDOMIZE
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},
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{ "allverbose", "Private", ITEM_FLAG,
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"Enables writing all logged messages to stderr",
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&umem_output, 2
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},
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{ NULL, "-- end of UMEM_DEBUG --", ITEM_INVALID }
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};
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const char *____umem_environ_msg_logging = "-- UMEM_LOGGING --";
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static umem_env_item_t umem_logging_items[] = {
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{ "transaction", "Unstable", ITEM_SPECIAL,
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"If 'audit' is set in UMEM_DEBUG, the audit structures "
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"from previous transactions are entered into this log.",
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NULL, 0, NULL,
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&umem_transaction_log_size, &umem_log_process
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},
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{ "contents", "Unstable", ITEM_SPECIAL,
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"If 'audit' is set in UMEM_DEBUG, the contents of objects "
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"are recorded in this log as they are freed. If the "
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"'contents' option is not set in UMEM_DEBUG, the first "
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"256 bytes of each freed buffer will be saved.",
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&umem_flags, UMF_CONTENTS, NULL,
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&umem_content_log_size, &umem_log_process
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},
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{ "fail", "Unstable", ITEM_SPECIAL,
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"Records are entered into this log for every failed "
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"allocation.",
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NULL, 0, NULL,
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&umem_failure_log_size, &umem_log_process
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},
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{ "slab", "Private", ITEM_SPECIAL,
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"Every slab created will be entered into this log.",
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NULL, 0, NULL,
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&umem_slab_log_size, &umem_log_process
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},
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{ NULL, "-- end of UMEM_LOGGING --", ITEM_INVALID }
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};
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typedef struct umem_envvar {
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const char *env_name;
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const char *env_func;
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umem_env_item_t *env_item_list;
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const char *env_getenv_result;
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const char *env_func_result;
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} umem_envvar_t;
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static umem_envvar_t umem_envvars[] = {
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{ "UMEM_DEBUG", "_umem_debug_init", umem_debug_items },
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{ "UMEM_OPTIONS", "_umem_options_init", umem_options_items },
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{ "UMEM_LOGGING", "_umem_logging_init", umem_logging_items },
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{ NULL, NULL, NULL }
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};
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static umem_envvar_t *env_current;
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#define CURRENT (env_current->env_name)
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static int
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empty(const char *str)
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{
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char c;
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while ((c = *str) != '\0' && isspace(c))
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str++;
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return (*str == '\0');
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}
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static int
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item_uint_process(const umem_env_item_t *item, const char *item_arg)
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{
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ulong_t result;
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char *endptr = "";
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int olderrno;
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olderrno = errno;
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errno = 0;
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if (empty(item_arg)) {
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goto badnumber;
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}
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result = strtoul(item_arg, &endptr, 10);
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if (result == ULONG_MAX && errno == ERANGE) {
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errno = olderrno;
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goto overflow;
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}
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errno = olderrno;
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if (*endptr != '\0')
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goto badnumber;
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if ((uint_t)result != result)
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goto overflow;
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(*item->item_uint_target) = (uint_t)result;
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return (ARG_SUCCESS);
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badnumber:
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log_message("%s: %s: not a number\n", CURRENT, item->item_name);
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return (ARG_BAD);
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overflow:
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log_message("%s: %s: overflowed\n", CURRENT, item->item_name);
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return (ARG_BAD);
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}
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static int
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item_size_process(const umem_env_item_t *item, const char *item_arg)
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{
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ulong_t result;
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ulong_t result_arg;
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char *endptr = "";
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int olderrno;
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if (empty(item_arg))
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goto badnumber;
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olderrno = errno;
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errno = 0;
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result_arg = strtoul(item_arg, &endptr, 10);
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if (result_arg == ULONG_MAX && errno == ERANGE) {
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errno = olderrno;
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goto overflow;
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}
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errno = olderrno;
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result = result_arg;
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switch (*endptr) {
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case 't':
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case 'T':
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result *= 1024;
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if (result < result_arg)
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goto overflow;
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/*FALLTHRU*/
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case 'g':
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case 'G':
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result *= 1024;
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if (result < result_arg)
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goto overflow;
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/*FALLTHRU*/
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case 'm':
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case 'M':
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result *= 1024;
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if (result < result_arg)
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goto overflow;
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/*FALLTHRU*/
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case 'k':
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case 'K':
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result *= 1024;
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if (result < result_arg)
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goto overflow;
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endptr++; /* skip over the size character */
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break;
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default:
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break; /* handled later */
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}
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if (*endptr != '\0')
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goto badnumber;
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(*item->item_size_target) = result;
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return (ARG_SUCCESS);
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badnumber:
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log_message("%s: %s: not a number\n", CURRENT, item->item_name);
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return (ARG_BAD);
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overflow:
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log_message("%s: %s: overflowed\n", CURRENT, item->item_name);
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return (ARG_BAD);
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}
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static int
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umem_log_process(const umem_env_item_t *item, const char *item_arg)
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{
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if (item_arg != NULL) {
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int ret;
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ret = item_size_process(item, item_arg);
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if (ret != ARG_SUCCESS)
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return (ret);
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if (*item->item_size_target == 0)
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return (ARG_SUCCESS);
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} else
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*item->item_size_target = 64*1024;
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umem_logging = 1;
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return (ARG_SUCCESS);
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}
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#ifndef UMEM_STANDALONE
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static int
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umem_backend_process(const umem_env_item_t *item, const char *item_arg)
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{
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const char *name = item->item_name;
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if (item_arg == NULL)
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goto fail;
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if (strcmp(item_arg, "sbrk") == 0)
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vmem_backend |= VMEM_BACKEND_SBRK;
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else if (strcmp(item_arg, "mmap") == 0)
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vmem_backend |= VMEM_BACKEND_MMAP;
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else
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goto fail;
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return (ARG_SUCCESS);
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fail:
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log_message("%s: %s: must be %s=sbrk or %s=mmap\n",
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CURRENT, name, name, name);
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return (ARG_BAD);
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}
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#endif
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static int
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process_item(const umem_env_item_t *item, const char *item_arg)
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{
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int arg_required = 0;
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arg_process_t *processor;
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switch (item->item_type) {
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case ITEM_FLAG:
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case ITEM_CLEARFLAG:
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case ITEM_OPTUINT:
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case ITEM_OPTSIZE:
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case ITEM_SPECIAL:
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arg_required = 0;
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break;
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case ITEM_UINT:
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case ITEM_SIZE:
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arg_required = 1;
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break;
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}
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||
|
switch (item->item_type) {
|
||
|
case ITEM_FLAG:
|
||
|
case ITEM_CLEARFLAG:
|
||
|
if (item_arg != NULL) {
|
||
|
log_message("%s: %s: does not take a value. ignored\n",
|
||
|
CURRENT, item->item_name);
|
||
|
return (1);
|
||
|
}
|
||
|
processor = NULL;
|
||
|
break;
|
||
|
|
||
|
case ITEM_UINT:
|
||
|
case ITEM_OPTUINT:
|
||
|
processor = item_uint_process;
|
||
|
break;
|
||
|
|
||
|
case ITEM_SIZE:
|
||
|
case ITEM_OPTSIZE:
|
||
|
processor = item_size_process;
|
||
|
break;
|
||
|
|
||
|
case ITEM_SPECIAL:
|
||
|
processor = item->item_special;
|
||
|
break;
|
||
|
|
||
|
default:
|
||
|
log_message("%s: %s: Invalid type. Ignored\n",
|
||
|
CURRENT, item->item_name);
|
||
|
return (1);
|
||
|
}
|
||
|
|
||
|
if (arg_required && item_arg == NULL) {
|
||
|
log_message("%s: %s: Required value missing\n",
|
||
|
CURRENT, item->item_name);
|
||
|
goto invalid;
|
||
|
}
|
||
|
|
||
|
if (item_arg != NULL || item->item_type == ITEM_SPECIAL) {
|
||
|
if (processor(item, item_arg) != ARG_SUCCESS)
|
||
|
goto invalid;
|
||
|
}
|
||
|
|
||
|
if (item->item_flag_target) {
|
||
|
if (item->item_type == ITEM_CLEARFLAG)
|
||
|
(*item->item_flag_target) &= ~item->item_flag_value;
|
||
|
else
|
||
|
(*item->item_flag_target) |= item->item_flag_value;
|
||
|
}
|
||
|
return (0);
|
||
|
|
||
|
invalid:
|
||
|
return (1);
|
||
|
}
|
||
|
|
||
|
#define ENV_SHORT_BYTES 10 /* bytes to print on error */
|
||
|
void
|
||
|
umem_process_value(umem_env_item_t *item_list, const char *beg, const char *end)
|
||
|
{
|
||
|
char buf[UMEM_ENV_ITEM_MAX];
|
||
|
char *argptr;
|
||
|
|
||
|
size_t count;
|
||
|
|
||
|
while (beg < end && isspace(*beg))
|
||
|
beg++;
|
||
|
|
||
|
while (beg < end && isspace(*(end - 1)))
|
||
|
end--;
|
||
|
|
||
|
if (beg >= end) {
|
||
|
log_message("%s: empty option\n", CURRENT);
|
||
|
return;
|
||
|
}
|
||
|
|
||
|
count = end - beg;
|
||
|
|
||
|
if (count + 1 > sizeof (buf)) {
|
||
|
char outbuf[ENV_SHORT_BYTES + 1];
|
||
|
/*
|
||
|
* Have to do this, since sprintf("%10s",...) calls malloc()
|
||
|
*/
|
||
|
(void) strncpy(outbuf, beg, ENV_SHORT_BYTES);
|
||
|
outbuf[ENV_SHORT_BYTES] = 0;
|
||
|
|
||
|
log_message("%s: argument \"%s...\" too long\n", CURRENT,
|
||
|
outbuf);
|
||
|
return;
|
||
|
}
|
||
|
|
||
|
(void) strncpy(buf, beg, count);
|
||
|
buf[count] = 0;
|
||
|
|
||
|
argptr = strchr(buf, '=');
|
||
|
|
||
|
if (argptr != NULL)
|
||
|
*argptr++ = 0;
|
||
|
|
||
|
for (; item_list->item_name != NULL; item_list++) {
|
||
|
if (strcmp(buf, item_list->item_name) == 0) {
|
||
|
(void) process_item(item_list, argptr);
|
||
|
return;
|
||
|
}
|
||
|
}
|
||
|
log_message("%s: '%s' not recognized\n", CURRENT, buf);
|
||
|
}
|
||
|
|
||
|
/*ARGSUSED*/
|
||
|
void
|
||
|
umem_setup_envvars(int invalid)
|
||
|
{
|
||
|
umem_envvar_t *cur_env;
|
||
|
static volatile enum {
|
||
|
STATE_START,
|
||
|
STATE_GETENV,
|
||
|
STATE_DLSYM,
|
||
|
STATE_FUNC,
|
||
|
STATE_DONE
|
||
|
} state = STATE_START;
|
||
|
#ifndef UMEM_STANDALONE
|
||
|
void *h;
|
||
|
#endif
|
||
|
|
||
|
if (invalid) {
|
||
|
const char *where;
|
||
|
/*
|
||
|
* One of the calls below invoked malloc() recursively. We
|
||
|
* remove any partial results and return.
|
||
|
*/
|
||
|
|
||
|
switch (state) {
|
||
|
case STATE_START:
|
||
|
where = "before getenv(3C) calls -- "
|
||
|
"getenv(3C) results ignored.";
|
||
|
break;
|
||
|
case STATE_GETENV:
|
||
|
where = "during getenv(3C) calls -- "
|
||
|
"getenv(3C) results ignored.";
|
||
|
break;
|
||
|
case STATE_DLSYM:
|
||
|
where = "during dlsym(3C) call -- "
|
||
|
"_umem_*() results ignored.";
|
||
|
break;
|
||
|
case STATE_FUNC:
|
||
|
where = "during _umem_*() call -- "
|
||
|
"_umem_*() results ignored.";
|
||
|
break;
|
||
|
case STATE_DONE:
|
||
|
where = "after dlsym() or _umem_*() calls.";
|
||
|
break;
|
||
|
default:
|
||
|
where = "at unknown point -- "
|
||
|
"_umem_*() results ignored.";
|
||
|
break;
|
||
|
}
|
||
|
|
||
|
log_message("recursive allocation %s\n", where);
|
||
|
|
||
|
for (cur_env = umem_envvars; cur_env->env_name != NULL;
|
||
|
cur_env++) {
|
||
|
if (state == STATE_GETENV)
|
||
|
cur_env->env_getenv_result = NULL;
|
||
|
if (state != STATE_DONE)
|
||
|
cur_env->env_func_result = NULL;
|
||
|
}
|
||
|
|
||
|
state = STATE_DONE;
|
||
|
return;
|
||
|
}
|
||
|
|
||
|
state = STATE_GETENV;
|
||
|
|
||
|
for (cur_env = umem_envvars; cur_env->env_name != NULL; cur_env++) {
|
||
|
cur_env->env_getenv_result = getenv(cur_env->env_name);
|
||
|
if (state == STATE_DONE)
|
||
|
return; /* recursed */
|
||
|
}
|
||
|
|
||
|
#ifndef UMEM_STANDALONE
|
||
|
#ifdef _WIN32
|
||
|
# define dlopen(a, b) GetModuleHandle(NULL)
|
||
|
# define dlsym(a, b) GetProcAddress((HANDLE)a, b)
|
||
|
# define dlclose(a) 0
|
||
|
# define dlerror() 0
|
||
|
#endif
|
||
|
/* get a handle to the "a.out" object */
|
||
|
if ((h = dlopen(0, RTLD_FIRST | RTLD_LAZY)) != NULL) {
|
||
|
for (cur_env = umem_envvars; cur_env->env_name != NULL;
|
||
|
cur_env++) {
|
||
|
const char *(*func)(void);
|
||
|
const char *value;
|
||
|
|
||
|
state = STATE_DLSYM;
|
||
|
func = (const char *(*)(void))dlsym(h,
|
||
|
cur_env->env_func);
|
||
|
|
||
|
if (state == STATE_DONE)
|
||
|
break; /* recursed */
|
||
|
|
||
|
state = STATE_FUNC;
|
||
|
if (func != NULL) {
|
||
|
value = func();
|
||
|
if (state == STATE_DONE)
|
||
|
break; /* recursed */
|
||
|
cur_env->env_func_result = value;
|
||
|
}
|
||
|
}
|
||
|
(void) dlclose(h);
|
||
|
} else {
|
||
|
(void) dlerror(); /* snarf dlerror() */
|
||
|
}
|
||
|
#endif /* UMEM_STANDALONE */
|
||
|
|
||
|
state = STATE_DONE;
|
||
|
}
|
||
|
|
||
|
/*
|
||
|
* Process the environment variables.
|
||
|
*/
|
||
|
void
|
||
|
umem_process_envvars(void)
|
||
|
{
|
||
|
const char *value;
|
||
|
const char *end, *next;
|
||
|
umem_envvar_t *cur_env;
|
||
|
|
||
|
for (cur_env = umem_envvars; cur_env->env_name != NULL; cur_env++) {
|
||
|
env_current = cur_env;
|
||
|
|
||
|
value = cur_env->env_getenv_result;
|
||
|
if (value == NULL)
|
||
|
value = cur_env->env_func_result;
|
||
|
|
||
|
/* ignore if missing or empty */
|
||
|
if (value == NULL)
|
||
|
continue;
|
||
|
|
||
|
for (end = value; *end != '\0'; value = next) {
|
||
|
end = strchr(value, ',');
|
||
|
if (end != NULL)
|
||
|
next = end + 1; /* skip the comma */
|
||
|
else
|
||
|
next = end = value + strlen(value);
|
||
|
|
||
|
umem_process_value(cur_env->env_item_list, value, end);
|
||
|
}
|
||
|
}
|
||
|
}
|