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"
26 #include "time_support.h"
36 static FILE* log_output;
37 static log_callback_t *log_callbacks = NULL;
39 static long long start;
41 static char *log_strings[5] =
52 /* The log_puts() serves to somewhat different goals:
55 * - feeding low-level info to the user in GDB or Telnet
57 * The latter dictates that strings without newline are not logged, lest there
58 * will be *MANY log lines when sending one char at the time(e.g.
62 static void log_puts(enum log_levels level, const char *file, int line, const char *function, const char *string)
65 if (level == LOG_LVL_OUTPUT)
67 /* do not prepend any headers, just print out what we were given and return */
68 fputs(string, log_output);
73 f = strrchr(file, '/');
77 if (strchr(string, '\n')!=NULL)
79 if (debug_level >= LOG_LVL_DEBUG)
81 /* print with count and time information */
82 int t=(int)(timeval_ms()-start);
87 fprintf(log_output, "%s %d %d %s:%d %s() %d: %s", log_strings[level+1], count, t, file, line, function, info.fordblks, string);
91 /* do not print count and time */
92 fprintf(log_output, "%s %s:%d %s(): %s", log_strings[level+1], file, line, function, string);
96 /* only entire lines are logged. Otherwise it's
97 * single chars intended for the log callbacks. */
102 /* Never forward LOG_LVL_DEBUG, too verbose and they can be found in the log if need be */
103 if (level <= LOG_LVL_INFO)
105 log_callback_t *cb, *next;
107 /* DANGER!!!! the log callback can remove itself!!!! */
111 cb->fn(cb->priv, file, line, function, string);
117 void log_printf(enum log_levels level, const char *file, int line, const char *function, const char *format, ...)
123 if (level > debug_level)
126 va_start(ap, format);
128 string = alloc_vprintf(format, ap);
131 log_puts(level, file, line, function, string);
138 void log_printf_lf(enum log_levels level, const char *file, int line, const char *function, const char *format, ...)
144 if (level > debug_level)
147 va_start(ap, format);
149 string = alloc_vprintf(format, ap);
152 strcat(string, "\n"); /* alloc_vprintf guaranteed the buffer to be at least one char longer */
153 log_puts(level, file, line, function, string);
160 /* change the current debug level on the fly
163 * 2: + INFORMATIONAL MSGS
166 int handle_debug_level_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc)
169 command_print(cmd_ctx, "debug_level: %i", debug_level);
172 debug_level = strtoul(args[0], NULL, 0);
183 int handle_log_output_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc)
187 FILE* file = fopen(args[0], "w");
198 int log_register_commands(struct command_context_s *cmd_ctx)
200 start = timeval_ms();
201 register_command(cmd_ctx, NULL, "log_output", handle_log_output_command,
202 COMMAND_ANY, "redirect logging to <file> (default: stderr)");
203 register_command(cmd_ctx, NULL, "debug_level", handle_debug_level_command,
204 COMMAND_ANY, "adjust debug level <0-3>");
209 int log_init(struct command_context_s *cmd_ctx)
211 /* set defaults for daemon configuration, if not set by cmdline or cfgfile */
212 if (debug_level == -1)
213 debug_level = LOG_LVL_INFO;
215 if (log_output == NULL)
223 int set_log_output(struct command_context_s *cmd_ctx, FILE *output)
229 /* add/remove log callback handler */
230 int log_add_callback(log_callback_fn fn, void *priv)
234 /* prevent the same callback to be registered more than once, just for sure */
235 for (cb = log_callbacks; cb; cb = cb->next)
237 if (cb->fn == fn && cb->priv == priv)
238 return ERROR_INVALID_ARGUMENTS;
241 /* alloc memory, it is safe just to return in case of an error, no need for the caller to check this */
242 if ((cb = malloc(sizeof(log_callback_t))) == NULL)
243 return ERROR_BUF_TOO_SMALL;
245 /* add item to the beginning of the linked list */
248 cb->next = log_callbacks;
254 int log_remove_callback(log_callback_fn fn, void *priv)
256 log_callback_t *cb, **p;
258 for (p = &log_callbacks; (cb = *p); p = &(*p)->next)
260 if (cb->fn == fn && cb->priv == priv)
269 return ERROR_INVALID_ARGUMENTS;
272 /* return allocated string w/printf() result */
273 char *alloc_vprintf(const char *fmt, va_list ap)
275 /* no buffer at the beginning, force realloc to do the job */
278 /* start with buffer size suitable for typical messages */
286 string = realloc(string, size);
294 va_copy(ap_copy, ap);
296 ret = vsnprintf(string, size, fmt, ap_copy);
297 /* NB! The result of the vsnprintf() might be an *EMPTY* string! */
298 if ((ret >= 0) && ((ret + 1) < size))
301 /* there was just enough or not enough space, allocate more in the next round */
302 size *= 2; /* double the buffer size */
305 /* the returned buffer is by principle guaranteed to be at least one character longer */
309 char *alloc_printf(const char *format, ...)
313 va_start(ap, format);
314 string = alloc_vprintf(format, ap);