lvm2/lib/log/log.c

/*
 * Copyright (C) 2001 Sistina Software (UK) Limited.
 *
 * This file is released under the LGPL.
 */

#include "log.h"
#include <stdarg.h>
#include <syslog.h>

static FILE *_log = 0;

static int _verbose_level = 0;
static int _test = 0;
static int _partial = 0;
static int _debug_level = 0;
static int _syslog = 0;
static int _indent = 1;
static int _log_cmd_name = 0;
static int _log_suppress = 0;
static int _ignorelockingfailure = 0;
static char _cmd_name[30] = "";
static char _msg_prefix[30] = "  ";

void init_log(FILE * fp)
{
	_log = fp;
}

void init_syslog(int facility)
{
	openlog("lvm", LOG_PID, facility);
	_syslog = 1;
}

void log_suppress(int suppress)
{
	_log_suppress = suppress;
}

void fin_log()
{
	_log = 0;
}

void fin_syslog()
{
	if (_syslog)
		closelog();
	_syslog = 0;
}

void init_verbose(int level)
{
	_verbose_level = level;
}

void init_test(int level)
{
	_test = level;
	if (_test)
		log_print("Test mode. Metadata will NOT be updated.");
}

void init_partial(int level)
{
	_partial = level;
}

void init_ignorelockingfailure(int level)
{
	_ignorelockingfailure = level;
}

void init_cmd_name(int status)
{
	_log_cmd_name = status;
}

void set_cmd_name(const char *cmd)
{
	if (!_log_cmd_name)
		return;
	strncpy(_cmd_name, cmd, sizeof(_cmd_name));
	_cmd_name[sizeof(_cmd_name) - 1] = '\0';
}

void init_msg_prefix(const char *prefix)
{
	strncpy(_msg_prefix, prefix, sizeof(_msg_prefix));
	_msg_prefix[sizeof(_msg_prefix) - 1] = '\0';
}

void init_indent(int indent)
{
	_indent = indent;
}

int test_mode()
{
	return _test;
}

int partial_mode()
{
	return _partial;
}

int ignorelockingfailure()
{
	return _ignorelockingfailure;
}

void init_debug(int level)
{
	_debug_level = level;
}

int debug_level()
{
	return _debug_level;
}

void print_log(int level, const char *file, int line, const char *format, ...)
{
	va_list ap;

	if (!_log_suppress) {
		va_start(ap, format);
		switch (level) {
		case _LOG_DEBUG:
			if (!strcmp("<backtrace>", format))
				break;
			if (_verbose_level > 2) {
				printf("%s%s", _cmd_name, _msg_prefix);
				if (_indent)
					printf("      ");
				vprintf(format, ap);
				putchar('\n');
			}
			break;

		case _LOG_INFO:
			if (_verbose_level > 1) {
				printf("%s%s", _cmd_name, _msg_prefix);
				if (_indent)
					printf("    ");
				vprintf(format, ap);
				putchar('\n');
			}
			break;
		case _LOG_NOTICE:
			if (_verbose_level) {
				printf("%s%s", _cmd_name, _msg_prefix);
				if (_indent)
					printf("  ");
				vprintf(format, ap);
				putchar('\n');
			}
			break;
		case _LOG_WARN:
			printf("%s%s", _cmd_name, _msg_prefix);
			vprintf(format, ap);
			putchar('\n');
			break;
		case _LOG_ERR:
			fprintf(stderr, "%s%s", _cmd_name, _msg_prefix);
			vfprintf(stderr, format, ap);
			fputc('\n', stderr);
			break;
		case _LOG_FATAL:
		default:
			fprintf(stderr, "%s%s", _cmd_name, _msg_prefix);
			vfprintf(stderr, format, ap);
			fputc('\n', stderr);
			break;
			;
		}
		va_end(ap);
	}

	if (level > _debug_level)
		return;

	if (_log) {
		fprintf(_log, "%s:%d %s%s", file, line, _cmd_name, _msg_prefix);

		va_start(ap, format);
		vfprintf(_log, format, ap);
		va_end(ap);

		fprintf(_log, "\n");
		fflush(_log);
	}

	if (_syslog) {
		va_start(ap, format);
		vsyslog(level, format, ap);
		va_end(ap);
	}
}