1 /***************************************************************************
2 * Copyright (C) 2005 by Dominic Rath *
3 * Dominic.Rath@gmx.de *
5 * This program is free software; you can redistribute it and/or modify *
6 * it under the terms of the GNU General Public License as published by *
7 * the Free Software Foundation; either version 2 of the License, or *
8 * (at your option) any later version. *
10 * This program is distributed in the hope that it will be useful, *
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of *
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
13 * GNU General Public License for more details. *
15 * You should have received a copy of the GNU General Public License *
16 * along with this program; if not, write to the *
17 * Free Software Foundation, Inc., *
18 * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. *
19 ***************************************************************************/
25 #include "configuration.h"
35 static FILE* log_output;
36 static log_callback_t *log_callbacks = NULL;
40 static char *log_strings[5] =
52 static void log_puts(enum log_levels level, const char *file, int line, const char *function, const char *string)
56 if (level == LOG_OUTPUT)
58 /* do not prepend any headers, just print out what we were given and return */
59 fputs(string, log_output);
64 char *f = strrchr(file, '/');
68 if (debug_level >= LOG_DEBUG)
70 /* print with count and time information */
71 int t=(int)(time(NULL)-start);
72 fprintf(log_output, "%s %d %d %s:%d %s(): %s", log_strings[level+1], count, t, file, line, function, string);
76 /* do not print count and time */
77 fprintf(log_output, "%s %s:%d %s(): %s", log_strings[level+1], file, line, function, string);
82 /* Never forward LOG_DEBUG, too verbose and they can be found in the log if need be */
83 if (level <= LOG_INFO)
86 for (cb = log_callbacks; cb; cb = cb->next)
88 cb->fn(cb->priv, file, line, function, string);
93 void log_printf(enum log_levels level, const char *file, int line, const char *function, const char *format, ...)
98 if (level > debug_level)
102 va_start(ap, format);
104 string = alloc_printf(format, ap);
107 log_puts(level, file, line, function, string);
114 void log_printf_lf(enum log_levels level, const char *file, int line, const char *function, const char *format, ...)
119 if (level > debug_level)
123 va_start(ap, format);
125 string = alloc_printf(format, ap);
128 strcat(string, "\n"); /* alloc_printf guaranteed the buffer to be at least one char longer */
129 log_puts(level, file, line, function, string);
136 /* change the current debug level on the fly
139 * 2: + INFORMATIONAL MSGS
142 int handle_debug_level_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc)
145 command_print(cmd_ctx, "debug_level: %i", debug_level);
148 debug_level = strtoul(args[0], NULL, 0);
159 int handle_log_output_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc)
163 FILE* file = fopen(args[0], "w");
174 int log_register_commands(struct command_context_s *cmd_ctx)
177 register_command(cmd_ctx, NULL, "log_output", handle_log_output_command,
178 COMMAND_ANY, "redirect logging to <file> (default: stderr)");
179 register_command(cmd_ctx, NULL, "debug_level", handle_debug_level_command,
180 COMMAND_ANY, "adjust debug level <0-3>");
185 int log_init(struct command_context_s *cmd_ctx)
187 /* set defaults for daemon configuration, if not set by cmdline or cfgfile */
188 if (debug_level == -1)
189 debug_level = LOG_INFO;
191 if (log_output == NULL)
199 int set_log_output(struct command_context_s *cmd_ctx, FILE *output)
205 /* add/remove log callback handler */
206 int log_add_callback(log_callback_fn fn, void *priv)
210 /* prevent the same callback to be registered more than once, just for sure */
211 for (cb = log_callbacks; cb; cb = cb->next)
213 if (cb->fn == fn && cb->priv == priv)
214 return ERROR_INVALID_ARGUMENTS;
217 /* alloc memory, it is safe just to return in case of an error, no need for the caller to check this */
218 if ((cb = malloc(sizeof(log_callback_t))) == NULL)
219 return ERROR_BUF_TOO_SMALL;
221 /* add item to the beginning of the linked list */
224 cb->next = log_callbacks;
230 int log_remove_callback(log_callback_fn fn, void *priv)
232 log_callback_t *cb, **p;
234 for (p = &log_callbacks; (cb = *p); p = &(*p)->next)
236 if (cb->fn == fn && cb->priv == priv)
245 return ERROR_INVALID_ARGUMENTS;
248 /* return allocated string w/printf() result */
249 char *alloc_printf(const char *fmt, va_list ap)
251 /* no buffer at the beginning, force realloc to do the job */
254 /* start with minimal length to exercise all the code paths */
259 size *= 2; /* double the buffer size */
262 string = realloc(string, size);
271 ret = vsnprintf(string, size, fmt, ap);
272 /* NB! The result of the vsnprintf() might be an *EMPTY* string! */
273 if ((ret >= 0) && ((ret + 1) < size))
276 /* there was just enough or not enough space, allocate more in the next round */
279 /* the returned buffer is by principle guaranteed to be at least one character longer */