logsys.c
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logsys.c
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	/*
	* Copyright (c) 2002-2004 MontaVista Software, Inc.
	* Copyright (c) 2006-2010 Red Hat, Inc.
	*
	* Author: Steven Dake (sdake@redhat.com)
	* Author: Lon Hohberger (lhh@redhat.com)
	* Author: Fabio M. Di Nitto (fdinitto@redhat.com)
	*
	* All rights reserved.
	*
	* This software licensed under BSD license, the text of which follows:
	*
	* Redistribution and use in source and binary forms, with or without
	* modification, are permitted provided that the following conditions are met:
	*
	* - Redistributions of source code must retain the above copyright notice,
	* this list of conditions and the following disclaimer.
	* - Redistributions in binary form must reproduce the above copyright notice,
	* this list of conditions and the following disclaimer in the documentation
	* and/or other materials provided with the distribution.
	* - Neither the name of the MontaVista Software, Inc. nor the names of its
	* contributors may be used to endorse or promote products derived from this
	* software without specific prior written permission.
	*
	* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
	* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
	* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
	* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
	* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
	* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
	* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
	* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
	* THE POSSIBILITY OF SUCH DAMAGE.
	*/

	#include <config.h>

	#include <stdint.h>
	#include <ctype.h>
	#include <assert.h>
	#include <stdio.h>
	#include <string.h>

	#include <qb/qbdefs.h>
	#include <qb/qbutil.h>
	#include <qb/qblog.h>

	#include <corosync/list.h>
	#include <corosync/engine/logsys.h>

	/*
	* syslog prioritynames, facility names to value mapping
	* Some C libraries build this in to their headers, but it is non-portable
	* so logsys supplies its own version.
	*/
	struct syslog_names {
	const char *c_name;
	int c_val;
	};

	static struct syslog_names prioritynames[] =
	{
	{ "alert", LOG_ALERT },
	{ "crit", LOG_CRIT },
	{ "debug", LOG_DEBUG },
	{ "emerg", LOG_EMERG },
	{ "err", LOG_ERR },
	{ "error", LOG_ERR },
	{ "info", LOG_INFO },
	{ "notice", LOG_NOTICE },
	{ "warning", LOG_WARNING },
	{ NULL, -1 }
	};

	#define MAX_FILES_PER_SUBSYS 16
	#ifdef HAVE_SMALL_MEMORY_FOOTPRINT
	#define IPC_LOGSYS_SIZE 8192*64
	#else
	#define IPC_LOGSYS_SIZE 8192*1024
	#endif

	/*
	* need unlogical order to preserve 64bit alignment
	*/
	struct logsys_logger {
	char subsys[LOGSYS_MAX_SUBSYS_NAMELEN]; /* subsystem name */
	char logfile; / log to file */
	unsigned int mode; /* subsystem mode */
	unsigned int debug; /* debug on\|off */
	int syslog_priority; /* priority */
	int logfile_priority; /* priority to file */
	int init_status; /* internal field to handle init queues
	for subsystems */
	int32_t target_id;
	char *files[MAX_FILES_PER_SUBSYS];
	int32_t file_idx;
	int32_t dirty;
	};

	/* values for logsys_logger init_status */
	#define LOGSYS_LOGGER_INIT_DONE 0
	#define LOGSYS_LOGGER_NEEDS_INIT 1

	static int logsys_system_needs_init = LOGSYS_LOGGER_NEEDS_INIT;

	static struct logsys_logger logsys_loggers[LOGSYS_MAX_SUBSYS_COUNT + 1];

	static pthread_mutex_t logsys_config_mutex = PTHREAD_MUTEX_INITIALIZER;

	static int32_t _logsys_config_mode_set_unlocked(int32_t subsysid, uint32_t new_mode);
	static void _logsys_config_apply_per_file(int32_t s, const char *filename);
	static void _logsys_config_apply_per_subsys(int32_t s);

	static char *format_buffer=NULL;

	static int _logsys_config_subsys_get_unlocked (const char *subsys)
	{
	unsigned int i;

	if (!subsys) {
	return LOGSYS_MAX_SUBSYS_COUNT;
	}

	for (i = 0; i <= LOGSYS_MAX_SUBSYS_COUNT; i++) {
	if (strcmp (logsys_loggers[i].subsys, subsys) == 0) {
	return i;
	}
	}

	return (-1);
	}


	/*
	* we need a version that can work when somebody else is already
	* holding a config mutex lock or we will never get out of here
	*/
	static int logsys_config_file_set_unlocked (
	int subsysid,
	const char **error_string,
	const char *file)
	{
	static char error_string_response[512];
	int i;

	if (logsys_loggers[subsysid].target_id > 0) {
	/* TODO close file
	logsys_filter_apply(subsysid,
	QB_LOG_FILTER_REMOVE,
	logsys_loggers[subsysid].target_id);
	*/
	}

	logsys_loggers[subsysid].dirty = QB_TRUE;
	if (file == NULL) {
	return (0);
	}

	if (strlen(file) >= PATH_MAX) {
	snprintf (error_string_response,
	sizeof(error_string_response),
	"%s: logfile name exceed maximum system filename lenght\n",
	logsys_loggers[subsysid].subsys);
	*error_string = error_string_response;
	return (-1);
	}

	for (i = 0; i <= LOGSYS_MAX_SUBSYS_COUNT; i++) {
	if ((logsys_loggers[i].logfile != NULL) &&
	(strcmp (logsys_loggers[i].logfile, file) == 0) &&
	(i != subsysid)) {
	/* we have found another subsys with this config file
	* so add a filter
	*/
	logsys_loggers[subsysid].target_id = logsys_loggers[i].target_id;
	return (0);
	}
	}
	logsys_loggers[subsysid].logfile = strdup(file);
	if (logsys_loggers[subsysid].logfile == NULL) {
	snprintf (error_string_response,
	sizeof(error_string_response),
	"Unable to allocate memory for logfile '%s'\n",
	file);
	*error_string = error_string_response;
	return (-1);
	}

	if (logsys_loggers[subsysid].target_id > 0) {
	/* no one else is using this close it */
	qb_log_file_close(logsys_loggers[subsysid].target_id);
	}

	logsys_loggers[subsysid].target_id = qb_log_file_open(file);
	if (logsys_loggers[subsysid].target_id < 0) {
	int err = logsys_loggers[subsysid].target_id;
	char error_str[LOGSYS_MAX_PERROR_MSG_LEN];
	const char *error_ptr;
	error_ptr = qb_strerror_r(err, error_str, sizeof(error_str));

	free(logsys_loggers[subsysid].logfile);
	logsys_loggers[subsysid].logfile = NULL;
	snprintf (error_string_response,
	sizeof(error_string_response),
	"Can't open logfile '%s' for reason: %s (%d).\n",
	file, error_ptr, err);
	*error_string = error_string_response;
	return (-1);
	}
	qb_log_format_set(logsys_loggers[subsysid].target_id, format_buffer);
	return (0);
	}

	static void logsys_subsys_init (
	const char *subsys,
	int subsysid)
	{
	if (logsys_system_needs_init == LOGSYS_LOGGER_NEEDS_INIT) {
	logsys_loggers[subsysid].init_status =
	LOGSYS_LOGGER_NEEDS_INIT;
	} else {
	logsys_loggers[subsysid].mode = logsys_loggers[LOGSYS_MAX_SUBSYS_COUNT].mode;
	logsys_loggers[subsysid].debug = logsys_loggers[LOGSYS_MAX_SUBSYS_COUNT].debug;
	logsys_loggers[subsysid].syslog_priority = logsys_loggers[LOGSYS_MAX_SUBSYS_COUNT].syslog_priority;
	logsys_loggers[subsysid].logfile_priority = logsys_loggers[LOGSYS_MAX_SUBSYS_COUNT].logfile_priority;
	logsys_loggers[subsysid].init_status = LOGSYS_LOGGER_INIT_DONE;
	}
	strncpy (logsys_loggers[subsysid].subsys, subsys,
	sizeof (logsys_loggers[subsysid].subsys));
	logsys_loggers[subsysid].subsys[
	sizeof (logsys_loggers[subsysid].subsys) - 1] = '\0';
	logsys_loggers[subsysid].file_idx = 0;
	}

	static const char *_logsys_tags_stringify(uint32_t tags)
	{
	if (tags == QB_LOG_TAG_LIBQB_MSG) {
	return "QB";
	} else {
	return logsys_loggers[tags].subsys;
	}
	}

	void logsys_system_fini (void)
	{
	int i;
	int f;
	for (i = 0; i < LOGSYS_MAX_SUBSYS_COUNT; i++) {
	free(logsys_loggers[i].logfile);
	for (f = 0; f < logsys_loggers[i].file_idx; f++) {
	free(logsys_loggers[i].files[f]);
	}
	}

	qb_log_fini ();
	}

	/*
	* Internal API - exported
	*/

	int _logsys_system_setup(
	const char *mainsystem,
	unsigned int mode,
	int syslog_facility,
	int syslog_priority)
	{
	int i;
	int32_t fidx;
	char tempsubsys[LOGSYS_MAX_SUBSYS_NAMELEN];

	if ((mainsystem == NULL) \|\|
	(strlen(mainsystem) >= LOGSYS_MAX_SUBSYS_NAMELEN)) {
	return -1;
	}

	i = LOGSYS_MAX_SUBSYS_COUNT;

	pthread_mutex_lock (&logsys_config_mutex);

	snprintf(logsys_loggers[i].subsys,
	LOGSYS_MAX_SUBSYS_NAMELEN,
	"%s", mainsystem);

	logsys_loggers[i].mode = mode;
	logsys_loggers[i].debug = 0;
	logsys_loggers[i].file_idx = 0;
	logsys_loggers[i].logfile_priority = syslog_priority;
	logsys_loggers[i].syslog_priority = syslog_priority;

	qb_log_init(mainsystem, syslog_facility, syslog_priority);
	if (logsys_loggers[i].mode & LOGSYS_MODE_OUTPUT_STDERR) {
	qb_log_ctl(QB_LOG_STDERR, QB_LOG_CONF_ENABLED, QB_TRUE);
	} else {
	qb_log_ctl(QB_LOG_STDERR, QB_LOG_CONF_ENABLED, QB_FALSE);
	}
	if (logsys_loggers[i].mode & LOGSYS_MODE_OUTPUT_SYSLOG) {
	qb_log_ctl(QB_LOG_SYSLOG, QB_LOG_CONF_ENABLED, QB_TRUE);
	} else {
	qb_log_ctl(QB_LOG_SYSLOG, QB_LOG_CONF_ENABLED, QB_FALSE);
	}

	qb_log_filter_ctl(QB_LOG_BLACKBOX, QB_LOG_FILTER_ADD,
	QB_LOG_FILTER_FILE, "*", LOG_TRACE);
	qb_log_ctl(QB_LOG_BLACKBOX, QB_LOG_CONF_SIZE, IPC_LOGSYS_SIZE);
	qb_log_ctl(QB_LOG_BLACKBOX, QB_LOG_CONF_THREADED, QB_FALSE);
	qb_log_ctl(QB_LOG_BLACKBOX, QB_LOG_CONF_ENABLED, QB_TRUE);

	logsys_format_set(NULL);
	qb_log_tags_stringify_fn_set(_logsys_tags_stringify);

	logsys_loggers[i].init_status = LOGSYS_LOGGER_INIT_DONE;
	logsys_system_needs_init = LOGSYS_LOGGER_INIT_DONE;

	for (i = 0; i < LOGSYS_MAX_SUBSYS_COUNT; i++) {
	if ((strcmp (logsys_loggers[i].subsys, "") != 0) &&
	(logsys_loggers[i].init_status ==
	LOGSYS_LOGGER_NEEDS_INIT)) {
	fidx = logsys_loggers[i].file_idx;
	strncpy (tempsubsys, logsys_loggers[i].subsys,
	sizeof (tempsubsys));
	tempsubsys[sizeof (tempsubsys) - 1] = '\0';
	logsys_subsys_init(tempsubsys, i);
	logsys_loggers[i].file_idx = fidx;
	_logsys_config_mode_set_unlocked(i, logsys_loggers[i].mode);
	_logsys_config_apply_per_subsys(i);
	}
	}

	pthread_mutex_unlock (&logsys_config_mutex);

	return (0);
	}


	static void _logsys_subsys_filename_add (int32_t s, const char *filename)
	{
	int i;

	if (filename == NULL) {
	return;
	}
	assert(logsys_loggers[s].file_idx < MAX_FILES_PER_SUBSYS);
	assert(logsys_loggers[s].file_idx >= 0);

	for (i = 0; i < logsys_loggers[s].file_idx; i++) {
	if (strcmp(logsys_loggers[s].files[i], filename) == 0) {
	return;
	}
	}
	logsys_loggers[s].files[logsys_loggers[s].file_idx++] = strdup(filename);

	if (logsys_system_needs_init == LOGSYS_LOGGER_INIT_DONE) {
	_logsys_config_apply_per_file(s, filename);
	}
	}

	int _logsys_subsys_create (const char subsys, const char filename)
	{
	int i;

	if ((subsys == NULL) \|\|
	(strlen(subsys) >= LOGSYS_MAX_SUBSYS_NAMELEN)) {
	return -1;
	}

	pthread_mutex_lock (&logsys_config_mutex);

	i = _logsys_config_subsys_get_unlocked (subsys);
	if ((i > -1) && (i < LOGSYS_MAX_SUBSYS_COUNT)) {
	_logsys_subsys_filename_add(i, filename);
	pthread_mutex_unlock (&logsys_config_mutex);
	return i;
	}

	for (i = 0; i < LOGSYS_MAX_SUBSYS_COUNT; i++) {
	if (strcmp (logsys_loggers[i].subsys, "") == 0) {
	logsys_subsys_init(subsys, i);
	_logsys_subsys_filename_add(i, filename);
	break;
	}
	}

	if (i >= LOGSYS_MAX_SUBSYS_COUNT) {
	i = -1;
	}

	pthread_mutex_unlock (&logsys_config_mutex);
	return i;
	}

	int _logsys_config_subsys_get (const char *subsys)
	{
	unsigned int i;

	pthread_mutex_lock (&logsys_config_mutex);

	i = _logsys_config_subsys_get_unlocked (subsys);

	pthread_mutex_unlock (&logsys_config_mutex);

	return i;
	}

	static int32_t _logsys_config_mode_set_unlocked(int32_t subsysid, uint32_t new_mode)
	{
	if ( logsys_loggers[subsysid].mode == new_mode) {
	return 0;
	}
	if (logsys_loggers[subsysid].target_id > 0) {
	qb_log_ctl(logsys_loggers[subsysid].target_id,
	QB_LOG_CONF_ENABLED,
	(new_mode & LOGSYS_MODE_OUTPUT_FILE));
	}

	if (subsysid == LOGSYS_MAX_SUBSYS_COUNT) {
	qb_log_ctl(QB_LOG_STDERR,
	QB_LOG_CONF_ENABLED,
	(new_mode & LOGSYS_MODE_OUTPUT_STDERR));
	qb_log_ctl(QB_LOG_SYSLOG,
	QB_LOG_CONF_ENABLED,
	(new_mode & LOGSYS_MODE_OUTPUT_SYSLOG));
	}
	logsys_loggers[subsysid].mode = new_mode;
	return 0;
	}

	int logsys_config_mode_set (const char *subsys, unsigned int mode)
	{
	int i;

	pthread_mutex_lock (&logsys_config_mutex);
	if (subsys != NULL) {
	i = _logsys_config_subsys_get_unlocked (subsys);
	if (i >= 0) {
	i = _logsys_config_mode_set_unlocked(i, mode);
	}
	} else {
	for (i = 0; i <= LOGSYS_MAX_SUBSYS_COUNT; i++) {
	_logsys_config_mode_set_unlocked(i, mode);
	}
	i = 0;
	}

	pthread_mutex_unlock (&logsys_config_mutex);

	return i;
	}

	unsigned int logsys_config_mode_get (const char *subsys)
	{
	int i;

	i = _logsys_config_subsys_get (subsys);
	if (i < 0) {
	return i;
	}

	return logsys_loggers[i].mode;
	}

	int logsys_config_file_set (
	const char *subsys,
	const char **error_string,
	const char *file)
	{
	int i;
	int res;

	pthread_mutex_lock (&logsys_config_mutex);

	if (subsys != NULL) {
	i = _logsys_config_subsys_get_unlocked (subsys);
	if (i < 0) {
	res = i;
	} else {
	res = logsys_config_file_set_unlocked(i, error_string, file);
	}
	} else {
	for (i = 0; i <= LOGSYS_MAX_SUBSYS_COUNT; i++) {
	res = logsys_config_file_set_unlocked(i, error_string, file);
	if (res < 0) {
	break;
	}
	}
	}

	pthread_mutex_unlock (&logsys_config_mutex);
	return res;
	}

	int logsys_format_set (const char *format)
	{
	int ret = 0;
	int i;
	int c;
	int w;
	int reminder;
	char syslog_format[128];

	if (format_buffer) {
	free(format_buffer);
	format_buffer = NULL;
	}

	format_buffer = strdup(format ? format : "%7p [%6g] %b");
	if (format_buffer == NULL) {
	ret = -1;
	}
	qb_log_format_set(QB_LOG_STDERR, format_buffer);

	for (i = 0; i <= LOGSYS_MAX_SUBSYS_COUNT; i++) {
	if (logsys_loggers[i].target_id > 0) {
	qb_log_format_set(logsys_loggers[i].target_id, format_buffer);
	}
	}

	/*
	* This just goes through and remove %t and %p from
	* the format string for syslog.
	*/
	w = 0;
	memset(syslog_format, '\0', sizeof(syslog_format));
	for (c = 0; c < strlen(format_buffer); c++) {
	if (format_buffer[c] == '%') {
	reminder = c;
	for (c++; c < strlen(format_buffer); c++) {
	if (isdigit(format_buffer[c])) {
	continue;
	}
	if (format_buffer[c] == 't' \|\|
	format_buffer[c] == 'p') {
	c++;
	} else {
	c = reminder;
	}
	break;
	}
	}
	syslog_format[w] = format_buffer[c];
	w++;
	}
	// printf("normal_format: %s\n", format_buffer);
	// printf("syslog_format: %s\n", syslog_format);
	qb_log_format_set(QB_LOG_SYSLOG, syslog_format);

	return ret;
	}

	char *logsys_format_get (void)
	{
	return format_buffer;
	}

	int logsys_config_syslog_facility_set (
	const char *subsys,
	unsigned int facility)
	{
	return qb_log_ctl(QB_LOG_SYSLOG, QB_LOG_CONF_FACILITY, facility);
	}

	int logsys_config_syslog_priority_set (
	const char *subsys,
	unsigned int priority)
	{
	int i;

	pthread_mutex_lock (&logsys_config_mutex);
	if (subsys != NULL) {
	i = _logsys_config_subsys_get_unlocked (subsys);
	if (i >= 0) {
	logsys_loggers[i].syslog_priority = priority;
	logsys_loggers[i].dirty = QB_TRUE;

	i = 0;
	}
	} else {
	for (i = 0; i <= LOGSYS_MAX_SUBSYS_COUNT; i++) {
	logsys_loggers[i].syslog_priority = priority;
	logsys_loggers[i].dirty = QB_TRUE;
	}
	i = 0;
	}
	pthread_mutex_unlock (&logsys_config_mutex);

	return i;
	}

	int logsys_config_logfile_priority_set (
	const char *subsys,
	unsigned int priority)
	{
	int i;

	pthread_mutex_lock (&logsys_config_mutex);
	if (subsys != NULL) {
	i = _logsys_config_subsys_get_unlocked (subsys);
	if (i >= 0) {
	logsys_loggers[i].logfile_priority = priority;
	logsys_loggers[i].dirty = QB_TRUE;
	i = 0;
	}
	} else {
	for (i = 0; i <= LOGSYS_MAX_SUBSYS_COUNT; i++) {
	logsys_loggers[i].logfile_priority = priority;
	logsys_loggers[i].dirty = QB_TRUE;
	}
	i = 0;
	}
	pthread_mutex_unlock (&logsys_config_mutex);

	return i;
	}


	static void _logsys_config_apply_per_file(int32_t s, const char *filename)
	{
	uint32_t syslog_priority = logsys_loggers[s].syslog_priority;
	uint32_t logfile_priority = logsys_loggers[s].logfile_priority;

	qb_log_filter_ctl(s, QB_LOG_TAG_SET, QB_LOG_FILTER_FILE,
	filename, LOG_TRACE);

	qb_log_filter_ctl(QB_LOG_SYSLOG, QB_LOG_FILTER_REMOVE,
	QB_LOG_FILTER_FILE, filename, LOG_TRACE);
	qb_log_filter_ctl(QB_LOG_STDERR, QB_LOG_FILTER_REMOVE,
	QB_LOG_FILTER_FILE, filename, LOG_TRACE);
	if (logsys_loggers[s].target_id > 0) {
	qb_log_filter_ctl(logsys_loggers[s].target_id,
	QB_LOG_FILTER_REMOVE,
	QB_LOG_FILTER_FILE, filename, LOG_TRACE);
	}

	if (logsys_loggers[s].debug) {
	syslog_priority = LOG_DEBUG;
	logfile_priority = LOG_DEBUG;
	}
	qb_log_filter_ctl(QB_LOG_SYSLOG, QB_LOG_FILTER_ADD,
	QB_LOG_FILTER_FILE, filename,
	syslog_priority);
	qb_log_filter_ctl(QB_LOG_STDERR, QB_LOG_FILTER_ADD,
	QB_LOG_FILTER_FILE, filename,
	logfile_priority);
	if (logsys_loggers[s].target_id > 0) {
	qb_log_filter_ctl(logsys_loggers[s].target_id,
	QB_LOG_FILTER_ADD,
	QB_LOG_FILTER_FILE, filename,
	logfile_priority);
	}
	}

	static void _logsys_config_apply_per_subsys(int32_t s)
	{
	int32_t f;
	for (f = 0; f < logsys_loggers[s].file_idx; f++) {
	_logsys_config_apply_per_file(s, logsys_loggers[s].files[f]);
	}
	logsys_loggers[s].dirty = QB_FALSE;
	}

	void logsys_config_apply(void)
	{
	int32_t s;

	for (s = 0; s <= LOGSYS_MAX_SUBSYS_COUNT; s++) {
	if (strcmp(logsys_loggers[s].subsys, "") == 0) {
	continue;
	}
	_logsys_config_apply_per_subsys(s);
	}
	}

	int logsys_config_debug_set (
	const char *subsys,
	unsigned int debug)
	{
	int i;

	pthread_mutex_lock (&logsys_config_mutex);
	if (subsys != NULL) {
	i = _logsys_config_subsys_get_unlocked (subsys);
	if (i >= 0) {
	logsys_loggers[i].dirty = QB_TRUE;
	logsys_loggers[i].debug = debug;
	i = 0;
	}
	} else {
	for (i = 0; i <= LOGSYS_MAX_SUBSYS_COUNT; i++) {
	logsys_loggers[i].debug = debug;
	logsys_loggers[i].dirty = QB_TRUE;
	}
	i = 0;
	}
	pthread_mutex_unlock (&logsys_config_mutex);

	return i;
	}

	int logsys_priority_id_get (const char *name)
	{
	unsigned int i;

	for (i = 0; prioritynames[i].c_name != NULL; i++) {
	if (strcasecmp(name, prioritynames[i].c_name) == 0) {
	return (prioritynames[i].c_val);
	}
	}
	return (-1);
	}

	const char *logsys_priority_name_get (unsigned int priority)
	{
	unsigned int i;

	for (i = 0; prioritynames[i].c_name != NULL; i++) {
	if (priority == prioritynames[i].c_val) {
	return (prioritynames[i].c_name);
	}
	}
	return (NULL);
	}

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