libumem/misc.c

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/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License, Version 1.0 only
* (the "License"). You may not use this file except in compliance
* with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
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/*
* Copyright 2008 Sun Microsystems, Inc. All rights reserved.
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* Use is subject to license terms.
*
* Portions Copyright 2006-2008 Message Systems, Inc. All rights reserved.
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*/
/* #pragma ident "@(#)misc.c 1.6 05/06/08 SMI" */
#define _BUILDING_UMEM_MISC_C
#include "config.h"
/* #include "mtlib.h" */
#if HAVE_UNISTD_H
#include <unistd.h>
#endif
#if HAVE_DLFCN_H
#include <dlfcn.h>
#endif
#include <signal.h>
#include <stdarg.h>
#include <stdio.h>
#include <string.h>
#if HAVE_SYS_MACHELF_H
#include <sys/machelf.h>
#endif
#include <umem_impl.h>
#include "misc.h"
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#define UMEM_ERRFD 2 /* goes to standard error */
#define UMEM_MAX_ERROR_SIZE 4096 /* error messages are truncated to this */
/*
* This is a circular buffer for holding error messages.
* umem_error_enter appends to the buffer, adding "..." to the beginning
* if data has been lost.
*/
#define ERR_SIZE 8192 /* must be a power of 2 */
static mutex_t umem_error_lock = DEFAULTMUTEX;
#ifdef NEED_64_LOCK
pthread_mutex_t umem_ppc_64inc_lock = PTHREAD_MUTEX_INITIALIZER;
#endif
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static char umem_error_buffer[ERR_SIZE] = "";
static uint_t umem_error_begin = 0;
static uint_t umem_error_end = 0;
#define WRITE_AND_INC(var, value) { \
umem_error_buffer[(var)++] = (value); \
var = P2PHASE((var), ERR_SIZE); \
}
static void
umem_log_enter(const char *error_str)
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{
int looped;
char c;
looped = 0;
(void) mutex_lock(&umem_error_lock);
while ((c = *error_str++) != '\0') {
WRITE_AND_INC(umem_error_end, c);
if (umem_error_end == umem_error_begin)
looped = 1;
}
umem_error_buffer[umem_error_end] = 0;
if (looped) {
uint_t idx;
umem_error_begin = P2PHASE(umem_error_end + 1, ERR_SIZE);
idx = umem_error_begin;
WRITE_AND_INC(idx, '.');
WRITE_AND_INC(idx, '.');
WRITE_AND_INC(idx, '.');
}
(void) mutex_unlock(&umem_error_lock);
}
void
umem_error_enter(const char *error_str)
{
#ifndef UMEM_STANDALONE
if (umem_output && !issetugid())
(void) write(UMEM_ERRFD, error_str, strlen(error_str));
#endif
umem_log_enter(error_str);
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}
int
highbit(ulong_t i)
{
register int h = 1;
if (i == 0)
return (0);
#ifdef _LP64
if (i & 0xffffffff00000000ul) {
h += 32; i >>= 32;
}
#endif
if (i & 0xffff0000) {
h += 16; i >>= 16;
}
if (i & 0xff00) {
h += 8; i >>= 8;
}
if (i & 0xf0) {
h += 4; i >>= 4;
}
if (i & 0xc) {
h += 2; i >>= 2;
}
if (i & 0x2) {
h += 1;
}
return (h);
}
int
lowbit(ulong_t i)
{
register int h = 1;
if (i == 0)
return (0);
#ifdef _LP64
if (!(i & 0xffffffff)) {
h += 32; i >>= 32;
}
#endif
if (!(i & 0xffff)) {
h += 16; i >>= 16;
}
if (!(i & 0xff)) {
h += 8; i >>= 8;
}
if (!(i & 0xf)) {
h += 4; i >>= 4;
}
if (!(i & 0x3)) {
h += 2; i >>= 2;
}
if (!(i & 0x1)) {
h += 1;
}
return (h);
}
void
hrt2ts(hrtime_t hrt, timestruc_t *tsp)
{
tsp->tv_sec = hrt / NANOSEC;
tsp->tv_nsec = hrt % NANOSEC;
}
void
log_message(const char *format, ...)
{
char buf[UMEM_MAX_ERROR_SIZE] = "";
va_list va;
va_start(va, format);
(void) vsnprintf(buf, UMEM_MAX_ERROR_SIZE-1, format, va);
va_end(va);
#ifndef UMEM_STANDALONE
if (umem_output > 1)
(void) write(UMEM_ERRFD, buf, strlen(buf));
#endif
umem_log_enter(buf);
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}
#ifndef UMEM_STANDALONE
void
debug_printf(const char *format, ...)
{
char buf[UMEM_MAX_ERROR_SIZE] = "";
va_list va;
va_start(va, format);
(void) vsnprintf(buf, UMEM_MAX_ERROR_SIZE-1, format, va);
va_end(va);
(void) write(UMEM_ERRFD, buf, strlen(buf));
}
#endif
void
umem_vprintf(const char *format, va_list va)
{
char buf[UMEM_MAX_ERROR_SIZE] = "";
(void) vsnprintf(buf, UMEM_MAX_ERROR_SIZE-1, format, va);
umem_error_enter(buf);
}
void
umem_printf(const char *format, ...)
{
va_list va;
va_start(va, format);
umem_vprintf(format, va);
va_end(va);
}
/*ARGSUSED*/
void
umem_printf_warn(void *ignored, const char *format, ...)
{
va_list va;
va_start(va, format);
umem_vprintf(format, va);
va_end(va);
}
/*
* print_sym tries to print out the symbol and offset of a pointer
*/
int
print_sym(void *pointer)
{
#if HAVE_SYS_MACHELF_H
int result;
Dl_info sym_info;
uintptr_t end = NULL;
Sym *ext_info = NULL;
result = dladdr1(pointer, &sym_info, (void **)&ext_info,
RTLD_DL_SYMENT);
if (result != 0) {
const char *endpath;
end = (uintptr_t)sym_info.dli_saddr + ext_info->st_size;
endpath = strrchr(sym_info.dli_fname, '/');
if (endpath)
endpath++;
else
endpath = sym_info.dli_fname;
umem_printf("%s'", endpath);
}
if (result == 0 || (uintptr_t)pointer > end) {
umem_printf("?? (0x%p)", pointer);
return (0);
} else {
umem_printf("%s+0x%p", sym_info.dli_sname,
(char *)pointer - (char *)sym_info.dli_saddr);
return (1);
}
#else
umem_printf("?? (0x%p)", pointer);
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return 0;
#endif
}