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] =
51 /* The log_printfv() serves to somewhat different goals:
54 * - feeding low-level info to the user in GDB or Telnet
56 * The latter dictates that strings without newline are not logged, lest there
57 * will be *MANY log lines when sending one char at the time(e.g.
61 static void log_puts(enum log_levels level, const char *file, int line, const char *function, const char *string)
65 if (level == LOG_OUTPUT)
67 /* do not prepend any headers, just print out what we were given and return */
68 fputs(string, log_output);
73 char *f = strrchr(file, '/');
77 if (strchr(string, '\n')!=NULL)
79 if (debug_level >= LOG_DEBUG)
81 /* print with count and time information */
82 int t=(int)(time(NULL)-start);
83 fprintf(log_output, "%s %d %d %s:%d %s(): %s", log_strings[level+1], count, t, file, line, function, string);
87 /* do not print count and time */
88 fprintf(log_output, "%s %s:%d %s(): %s", log_strings[level+1], file, line, function, string);
92 /* only entire lines are logged. Otherwise it's
93 * single chars intended for the log callbacks. */
98 /* Never forward LOG_DEBUG, too verbose and they can be found in the log if need be */
99 if (level <= LOG_INFO)
102 for (cb = log_callbacks; cb; cb = cb->next)
104 cb->fn(cb->priv, file, line, function, string);
109 void log_printf(enum log_levels level, const char *file, int line, const char *function, const char *format, ...)
114 if (level > debug_level)
118 va_start(ap, format);
120 string = alloc_printf(format, ap);
123 log_puts(level, file, line, function, string);
130 void log_printf_lf(enum log_levels level, const char *file, int line, const char *function, const char *format, ...)
135 if (level > debug_level)
139 va_start(ap, format);
141 string = alloc_printf(format, ap);
144 strcat(string, "\n"); /* alloc_printf guaranteed the buffer to be at least one char longer */
145 log_puts(level, file, line, function, string);
152 /* change the current debug level on the fly
155 * 2: + INFORMATIONAL MSGS
158 int handle_debug_level_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc)
161 command_print(cmd_ctx, "debug_level: %i", debug_level);
164 debug_level = strtoul(args[0], NULL, 0);
175 int handle_log_output_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc)
179 FILE* file = fopen(args[0], "w");
190 int log_register_commands(struct command_context_s *cmd_ctx)
193 register_command(cmd_ctx, NULL, "log_output", handle_log_output_command,
194 COMMAND_ANY, "redirect logging to <file> (default: stderr)");
195 register_command(cmd_ctx, NULL, "debug_level", handle_debug_level_command,
196 COMMAND_ANY, "adjust debug level <0-3>");
201 int log_init(struct command_context_s *cmd_ctx)
203 /* set defaults for daemon configuration, if not set by cmdline or cfgfile */
204 if (debug_level == -1)
205 debug_level = LOG_INFO;
207 if (log_output == NULL)
215 int set_log_output(struct command_context_s *cmd_ctx, FILE *output)
221 /* add/remove log callback handler */
222 int log_add_callback(log_callback_fn fn, void *priv)
226 /* prevent the same callback to be registered more than once, just for sure */
227 for (cb = log_callbacks; cb; cb = cb->next)
229 if (cb->fn == fn && cb->priv == priv)
230 return ERROR_INVALID_ARGUMENTS;
233 /* alloc memory, it is safe just to return in case of an error, no need for the caller to check this */
234 if ((cb = malloc(sizeof(log_callback_t))) == NULL)
235 return ERROR_BUF_TOO_SMALL;
237 /* add item to the beginning of the linked list */
240 cb->next = log_callbacks;
246 int log_remove_callback(log_callback_fn fn, void *priv)
248 log_callback_t *cb, **p;
250 for (p = &log_callbacks; (cb = *p); p = &(*p)->next)
252 if (cb->fn == fn && cb->priv == priv)
261 return ERROR_INVALID_ARGUMENTS;
264 /* return allocated string w/printf() result */
265 char *alloc_printf(const char *fmt, va_list ap)
267 /* no buffer at the beginning, force realloc to do the job */
270 /* start with minimal length to exercise all the code paths */
275 size *= 2; /* double the buffer size */
278 string = realloc(string, size);
287 ret = vsnprintf(string, size, fmt, ap);
288 /* NB! The result of the vsnprintf() might be an *EMPTY* string! */
289 if ((ret >= 0) && ((ret + 1) < size))
292 /* there was just enough or not enough space, allocate more in the next round */
295 /* the returned buffer is by principle guaranteed to be at least one character longer */