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)
64 if (level == LOG_LVL_OUTPUT)
66 /* do not prepend any headers, just print out what we were given and return */
67 fputs(string, log_output);
72 char *f = strrchr(file, '/');
76 if (strchr(string, '\n')!=NULL)
78 if (debug_level >= LOG_LVL_DEBUG)
80 /* print with count and time information */
81 int t=(int)(timeval_ms()-start);
82 fprintf(log_output, "%s %d %d %s:%d %s(): %s", log_strings[level+1], count, t, file, line, function, string);
86 /* do not print count and time */
87 fprintf(log_output, "%s %s:%d %s(): %s", log_strings[level+1], file, line, function, string);
91 /* only entire lines are logged. Otherwise it's
92 * single chars intended for the log callbacks. */
97 /* Never forward LOG_LVL_DEBUG, too verbose and they can be found in the log if need be */
98 if (level <= LOG_LVL_INFO)
100 log_callback_t *cb, *next;
102 /* DANGER!!!! the log callback can remove itself!!!! */
106 cb->fn(cb->priv, file, line, function, string);
112 void log_printf(enum log_levels level, const char *file, int line, const char *function, const char *format, ...)
117 if (level > debug_level)
121 va_start(ap, format);
123 string = alloc_vprintf(format, ap);
126 log_puts(level, file, line, function, string);
133 void log_printf_lf(enum log_levels level, const char *file, int line, const char *function, const char *format, ...)
138 if (level > debug_level)
142 va_start(ap, format);
144 string = alloc_vprintf(format, ap);
147 strcat(string, "\n"); /* alloc_vprintf guaranteed the buffer to be at least one char longer */
148 log_puts(level, file, line, function, string);
155 /* change the current debug level on the fly
158 * 2: + INFORMATIONAL MSGS
161 int handle_debug_level_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc)
164 command_print(cmd_ctx, "debug_level: %i", debug_level);
167 debug_level = strtoul(args[0], NULL, 0);
178 int handle_log_output_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc)
182 FILE* file = fopen(args[0], "w");
193 int log_register_commands(struct command_context_s *cmd_ctx)
195 start = timeval_ms();
196 register_command(cmd_ctx, NULL, "log_output", handle_log_output_command,
197 COMMAND_ANY, "redirect logging to <file> (default: stderr)");
198 register_command(cmd_ctx, NULL, "debug_level", handle_debug_level_command,
199 COMMAND_ANY, "adjust debug level <0-3>");
204 int log_init(struct command_context_s *cmd_ctx)
206 /* set defaults for daemon configuration, if not set by cmdline or cfgfile */
207 if (debug_level == -1)
208 debug_level = LOG_LVL_INFO;
210 if (log_output == NULL)
218 int set_log_output(struct command_context_s *cmd_ctx, FILE *output)
224 /* add/remove log callback handler */
225 int log_add_callback(log_callback_fn fn, void *priv)
229 /* prevent the same callback to be registered more than once, just for sure */
230 for (cb = log_callbacks; cb; cb = cb->next)
232 if (cb->fn == fn && cb->priv == priv)
233 return ERROR_INVALID_ARGUMENTS;
236 /* alloc memory, it is safe just to return in case of an error, no need for the caller to check this */
237 if ((cb = malloc(sizeof(log_callback_t))) == NULL)
238 return ERROR_BUF_TOO_SMALL;
240 /* add item to the beginning of the linked list */
243 cb->next = log_callbacks;
249 int log_remove_callback(log_callback_fn fn, void *priv)
251 log_callback_t *cb, **p;
253 for (p = &log_callbacks; (cb = *p); p = &(*p)->next)
255 if (cb->fn == fn && cb->priv == priv)
264 return ERROR_INVALID_ARGUMENTS;
267 /* return allocated string w/printf() result */
268 char *alloc_vprintf(const char *fmt, va_list ap)
270 /* no buffer at the beginning, force realloc to do the job */
273 /* start with buffer size suitable for typical messages */
279 string = realloc(string, size);
288 va_copy(ap_copy, ap);
291 ret = vsnprintf(string, size, fmt, ap_copy);
292 /* NB! The result of the vsnprintf() might be an *EMPTY* string! */
293 if ((ret >= 0) && ((ret + 1) < size))
296 /* there was just enough or not enough space, allocate more in the next round */
297 size *= 2; /* double the buffer size */
300 /* the returned buffer is by principle guaranteed to be at least one character longer */
304 char *alloc_printf(const char *format, ...)
308 va_start(ap, format);
309 string = alloc_vprintf(format, ap);