core: rework logging
Make it more flexible, add logging to a file, and absolute and relative timestamps.
This commit is contained in:
Dan Williams
227
src/mm-log.c
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227
src/mm-log.c
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/* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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/*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details:
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*
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* Copyright (C) 2011 Red Hat, Inc.
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*/
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#define _GNU_SOURCE
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#include <config.h>
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#include <stdio.h>
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#include <syslog.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <string.h>
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#include <unistd.h>
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#include "mm-log.h"
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enum {
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TS_FLAG_NONE = 0,
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TS_FLAG_WALL,
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TS_FLAG_REL
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};
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static gboolean ts_flags = TS_FLAG_NONE;
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static guint32 log_level = LOGL_INFO | LOGL_WARN | LOGL_ERR;
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static GTimeVal rel_start = { 0, 0 };
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static int logfd = -1;
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typedef struct {
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guint32 num;
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const char *name;
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} LogDesc;
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static const LogDesc level_descs[] = {
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{ LOGL_ERR, "ERR" },
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{ LOGL_WARN | LOGL_ERR, "WARN" },
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{ LOGL_INFO | LOGL_WARN | LOGL_ERR, "INFO" },
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{ LOGL_DEBUG | LOGL_INFO | LOGL_WARN | LOGL_ERR, "DEBUG" },
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{ 0, NULL }
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};
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void
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_mm_log (const char *loc,
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const char *func,
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guint32 level,
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const char *fmt,
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...)
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{
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va_list args;
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char *msg;
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GTimeVal tv;
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char tsbuf[100] = { 0 };
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char msgbuf[512] = { 0 };
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int syslog_priority = LOG_INFO;
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const char *prefix = NULL;
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if (!(log_level & level))
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return;
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va_start (args, fmt);
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msg = g_strdup_vprintf (fmt, args);
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va_end (args);
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if (ts_flags == TS_FLAG_WALL) {
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g_get_current_time (&tv);
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snprintf (&tsbuf[0], sizeof (tsbuf), " [%09ld.%06ld]", tv.tv_sec, tv.tv_usec);
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} else if (ts_flags == TS_FLAG_REL) {
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time_t secs;
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suseconds_t usecs;
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g_get_current_time (&tv);
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secs = tv.tv_sec - rel_start.tv_sec;
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usecs = tv.tv_usec - rel_start.tv_usec;
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if (usecs < 0) {
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secs--;
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usecs += 1000000;
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}
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snprintf (&tsbuf[0], sizeof (tsbuf), " [%06ld.%06ld]", secs, usecs);
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}
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if ((log_level & LOGL_DEBUG) && (level == LOGL_DEBUG))
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prefix = "debug";
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else if ((log_level & LOGL_INFO) && (level == LOGL_INFO))
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prefix = "info";
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else if ((log_level & LOGL_WARN) && (level == LOGL_WARN)) {
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prefix = "warn";
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syslog_priority = LOG_WARNING;
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} else if ((log_level & LOGL_ERR) && (level == LOGL_ERR)) {
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prefix = "err";
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syslog_priority = LOG_ERR;
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} else
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g_warn_if_reached ();
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if (prefix) {
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if (log_level & LOGL_DEBUG)
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snprintf (msgbuf, sizeof (msgbuf), "<%s>%s [%s] %s(): %s\n", prefix, tsbuf, loc, func, msg);
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else
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snprintf (msgbuf, sizeof (msgbuf), "<%s>%s %s\n", prefix, tsbuf, msg);
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if (logfd < 0)
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syslog (syslog_priority, "%s", msgbuf);
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else {
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write (logfd, msgbuf, strlen (msgbuf));
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fsync (logfd); /* Make sure output is dumped to disk immediately */
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}
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}
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g_free (msg);
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}
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static void
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log_handler (const gchar *log_domain,
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GLogLevelFlags level,
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const gchar *message,
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gpointer ignored)
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{
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int syslog_priority;
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switch (level) {
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case G_LOG_LEVEL_ERROR:
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syslog_priority = LOG_CRIT;
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break;
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case G_LOG_LEVEL_CRITICAL:
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syslog_priority = LOG_ERR;
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break;
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case G_LOG_LEVEL_WARNING:
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syslog_priority = LOG_WARNING;
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break;
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case G_LOG_LEVEL_MESSAGE:
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syslog_priority = LOG_NOTICE;
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break;
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case G_LOG_LEVEL_DEBUG:
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syslog_priority = LOG_DEBUG;
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break;
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case G_LOG_LEVEL_INFO:
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default:
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syslog_priority = LOG_INFO;
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break;
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}
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if (logfd < 0)
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syslog (syslog_priority, "%s", message);
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else
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write (logfd, message, strlen (message));
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}
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gboolean
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mm_log_setup (const char *level,
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const char *log_file,
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gboolean show_timestamps,
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gboolean rel_timestamps,
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GError **error)
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{
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/* levels */
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if (level && strlen (level)) {
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gboolean found = FALSE;
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const LogDesc *diter;
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for (diter = &level_descs[0]; diter->name; diter++) {
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if (!strcasecmp (diter->name, level)) {
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log_level = diter->num;
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found = TRUE;
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break;
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}
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}
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if (!found) {
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g_set_error (error, 0, 0, "Unknown log level '%s'", level);
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return FALSE;
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}
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}
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if (show_timestamps)
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ts_flags = TS_FLAG_WALL;
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else if (rel_timestamps)
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ts_flags = TS_FLAG_REL;
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/* Grab start time for relative timestamps */
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g_get_current_time (&rel_start);
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if (log_file == NULL)
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openlog (G_LOG_DOMAIN, LOG_CONS | LOG_PID | LOG_PERROR, LOG_DAEMON);
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else {
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logfd = open (log_file,
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O_CREAT | O_APPEND | O_WRONLY,
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S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
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if (logfd < 0) {
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g_set_error (error, 0, 0, "Failed to open log file: (%d) %s",
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errno, strerror (errno));
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return FALSE;
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}
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}
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g_log_set_handler (G_LOG_DOMAIN,
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G_LOG_LEVEL_MASK | G_LOG_FLAG_FATAL | G_LOG_FLAG_RECURSION,
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log_handler,
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NULL);
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return TRUE;
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}
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void
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mm_log_usr1 (void)
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{
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}
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void
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mm_log_shutdown (void)
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{
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if (logfd < 0)
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closelog ();
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else
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close (logfd);
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}
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