From 8eacd13ce7f528adc52614ce3cc5faf963b3fc5a Mon Sep 17 00:00:00 2001 From: Max Kellermann Date: Wed, 9 Jan 2013 22:33:06 +0100 Subject: sig_handlers, log: convert to C++ --- src/Log.cxx | 341 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 341 insertions(+) create mode 100644 src/Log.cxx (limited to 'src/Log.cxx') diff --git a/src/Log.cxx b/src/Log.cxx new file mode 100644 index 00000000..7ca64197 --- /dev/null +++ b/src/Log.cxx @@ -0,0 +1,341 @@ +/* + * Copyright (C) 2003-2013 The Music Player Daemon Project + * http://www.musicpd.org + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License along + * with this program; if not, write to the Free Software Foundation, Inc., + * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. + */ + +#include "config.h" +#include "Log.hxx" +#include "conf.h" +#include "utils.h" +#include "fd_util.h" +#include "mpd_error.h" + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#ifdef HAVE_SYSLOG +#include +#endif + +#undef G_LOG_DOMAIN +#define G_LOG_DOMAIN "log" + +#define LOG_LEVEL_SECURE G_LOG_LEVEL_INFO + +#define LOG_DATE_BUF_SIZE 16 +#define LOG_DATE_LEN (LOG_DATE_BUF_SIZE - 1) + +static GLogLevelFlags log_threshold = G_LOG_LEVEL_MESSAGE; + +static const char *log_charset; + +static bool stdout_mode = true; +static int out_fd; +static char *out_filename; + +static void redirect_logs(int fd) +{ + assert(fd >= 0); + if (dup2(fd, STDOUT_FILENO) < 0) + MPD_ERROR("problems dup2 stdout : %s\n", strerror(errno)); + if (dup2(fd, STDERR_FILENO) < 0) + MPD_ERROR("problems dup2 stderr : %s\n", strerror(errno)); +} + +static const char *log_date(void) +{ + static char buf[LOG_DATE_BUF_SIZE]; + time_t t = time(NULL); + strftime(buf, LOG_DATE_BUF_SIZE, "%b %d %H:%M : ", localtime(&t)); + return buf; +} + +/** + * Determines the length of the string excluding trailing whitespace + * characters. + */ +static int +chomp_length(const char *p) +{ + size_t length = strlen(p); + + while (length > 0 && g_ascii_isspace(p[length - 1])) + --length; + + return (int)length; +} + +static void +file_log_func(const gchar *log_domain, + GLogLevelFlags log_level, + const gchar *message, G_GNUC_UNUSED gpointer user_data) +{ + char *converted; + + if (log_level > log_threshold) + return; + + if (log_charset != NULL) { + converted = g_convert_with_fallback(message, -1, + log_charset, "utf-8", + NULL, NULL, NULL, NULL); + if (converted != NULL) + message = converted; + } else + converted = NULL; + + if (log_domain == NULL) + log_domain = ""; + + fprintf(stderr, "%s%s%s%.*s\n", + stdout_mode ? "" : log_date(), + log_domain, *log_domain == 0 ? "" : ": ", + chomp_length(message), message); + + g_free(converted); +} + +static void +log_init_stdout(void) +{ + g_log_set_default_handler(file_log_func, NULL); +} + +static int +open_log_file(void) +{ + assert(out_filename != NULL); + + return open_cloexec(out_filename, O_CREAT | O_WRONLY | O_APPEND, 0666); +} + +static bool +log_init_file(unsigned line, GError **error_r) +{ + assert(out_filename != NULL); + + out_fd = open_log_file(); + if (out_fd < 0) { + g_set_error(error_r, log_quark(), errno, + "failed to open log file \"%s\" (config line %u): %s", + out_filename, line, g_strerror(errno)); + return false; + } + + g_log_set_default_handler(file_log_func, NULL); + return true; +} + +#ifdef HAVE_SYSLOG + +static int +glib_to_syslog_level(GLogLevelFlags log_level) +{ + switch (log_level & G_LOG_LEVEL_MASK) { + case G_LOG_LEVEL_ERROR: + case G_LOG_LEVEL_CRITICAL: + return LOG_ERR; + + case G_LOG_LEVEL_WARNING: + return LOG_WARNING; + + case G_LOG_LEVEL_MESSAGE: + return LOG_NOTICE; + + case G_LOG_LEVEL_INFO: + return LOG_INFO; + + case G_LOG_LEVEL_DEBUG: + return LOG_DEBUG; + + default: + return LOG_NOTICE; + } +} + +static void +syslog_log_func(const gchar *log_domain, + GLogLevelFlags log_level, const gchar *message, + G_GNUC_UNUSED gpointer user_data) +{ + if (stdout_mode) { + /* fall back to the file log function during + startup */ + file_log_func(log_domain, log_level, + message, user_data); + return; + } + + if (log_level > log_threshold) + return; + + if (log_domain == NULL) + log_domain = ""; + + syslog(glib_to_syslog_level(log_level), "%s%s%.*s", + log_domain, *log_domain == 0 ? "" : ": ", + chomp_length(message), message); +} + +static void +log_init_syslog(void) +{ + assert(out_filename == NULL); + + openlog(PACKAGE, 0, LOG_DAEMON); + g_log_set_default_handler(syslog_log_func, NULL); +} + +#endif + +static inline GLogLevelFlags +parse_log_level(const char *value, unsigned line) +{ + if (0 == strcmp(value, "default")) + return G_LOG_LEVEL_MESSAGE; + if (0 == strcmp(value, "secure")) + return LOG_LEVEL_SECURE; + else if (0 == strcmp(value, "verbose")) + return G_LOG_LEVEL_DEBUG; + else { + MPD_ERROR("unknown log level \"%s\" at line %u\n", + value, line); + return G_LOG_LEVEL_MESSAGE; + } +} + +void +log_early_init(bool verbose) +{ + if (verbose) + log_threshold = G_LOG_LEVEL_DEBUG; + + log_init_stdout(); +} + +bool +log_init(bool verbose, bool use_stdout, GError **error_r) +{ + const struct config_param *param; + + g_get_charset(&log_charset); + + if (verbose) + log_threshold = G_LOG_LEVEL_DEBUG; + else if ((param = config_get_param(CONF_LOG_LEVEL)) != NULL) + log_threshold = parse_log_level(param->value, param->line); + + if (use_stdout) { + log_init_stdout(); + return true; + } else { + param = config_get_param(CONF_LOG_FILE); + if (param == NULL) { +#ifdef HAVE_SYSLOG + /* no configuration: default to syslog (if + available) */ + log_init_syslog(); + return true; +#else + g_set_error(error_r, log_quark(), 0, + "config parameter \"%s\" not found", + CONF_LOG_FILE); + return false; +#endif +#ifdef HAVE_SYSLOG + } else if (strcmp(param->value, "syslog") == 0) { + log_init_syslog(); + return true; +#endif + } else { + out_filename = config_dup_path(CONF_LOG_FILE, error_r); + return out_filename != NULL && + log_init_file(param->line, error_r); + } + } +} + +static void +close_log_files(void) +{ + if (stdout_mode) + return; + +#ifdef HAVE_SYSLOG + if (out_filename == NULL) + closelog(); +#endif +} + +void +log_deinit(void) +{ + close_log_files(); + g_free(out_filename); +} + + +void setup_log_output(bool use_stdout) +{ + fflush(NULL); + if (!use_stdout) { +#ifndef WIN32 + if (out_filename == NULL) + out_fd = open("/dev/null", O_WRONLY); +#endif + + if (out_fd >= 0) { + redirect_logs(out_fd); + close(out_fd); + } + + stdout_mode = false; + log_charset = NULL; + } +} + +int cycle_log_files(void) +{ + int fd; + + if (stdout_mode || out_filename == NULL) + return 0; + assert(out_filename); + + g_debug("Cycling log files...\n"); + close_log_files(); + + fd = open_log_file(); + if (fd < 0) { + g_warning("error re-opening log file: %s\n", out_filename); + return -1; + } + + redirect_logs(fd); + g_debug("Done cycling log files\n"); + return 0; +} -- cgit v1.2.3