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_puts() 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
)
63 if (level
== LOG_OUTPUT
)
65 /* do not prepend any headers, just print out what we were given and return */
66 fputs(string
, log_output
);
71 char *f
= strrchr(file
, '/');
75 if (strchr(string
, '\n')!=NULL
)
77 if (debug_level
>= LOG_DEBUG
)
79 /* print with count and time information */
80 int t
=(int)(time(NULL
)-start
);
81 fprintf(log_output
, "%s %d %d %s:%d %s(): %s", log_strings
[level
+1], count
, t
, file
, line
, function
, string
);
85 /* do not print count and time */
86 fprintf(log_output
, "%s %s:%d %s(): %s", log_strings
[level
+1], file
, line
, function
, string
);
90 /* only entire lines are logged. Otherwise it's
91 * single chars intended for the log callbacks. */
96 /* Never forward LOG_DEBUG, too verbose and they can be found in the log if need be */
97 if (level
<= LOG_INFO
)
99 log_callback_t
*cb
, *next
;
101 /* DANGER!!!! the log callback can remove itself!!!! */
105 cb
->fn(cb
->priv
, file
, line
, function
, string
);
111 void log_printf(enum log_levels level
, const char *file
, int line
, const char *function
, const char *format
, ...)
116 if (level
> debug_level
)
120 va_start(ap
, format
);
122 string
= alloc_printf(format
, ap
);
125 log_puts(level
, file
, line
, function
, string
);
132 void log_printf_lf(enum log_levels level
, const char *file
, int line
, const char *function
, const char *format
, ...)
137 if (level
> debug_level
)
141 va_start(ap
, format
);
143 string
= alloc_printf(format
, ap
);
146 strcat(string
, "\n"); /* alloc_printf guaranteed the buffer to be at least one char longer */
147 log_puts(level
, file
, line
, function
, string
);
154 /* change the current debug level on the fly
157 * 2: + INFORMATIONAL MSGS
160 int handle_debug_level_command(struct command_context_s
*cmd_ctx
, char *cmd
, char **args
, int argc
)
163 command_print(cmd_ctx
, "debug_level: %i", debug_level
);
166 debug_level
= strtoul(args
[0], NULL
, 0);
177 int handle_log_output_command(struct command_context_s
*cmd_ctx
, char *cmd
, char **args
, int argc
)
181 FILE* file
= fopen(args
[0], "w");
192 int log_register_commands(struct command_context_s
*cmd_ctx
)
195 register_command(cmd_ctx
, NULL
, "log_output", handle_log_output_command
,
196 COMMAND_ANY
, "redirect logging to <file> (default: stderr)");
197 register_command(cmd_ctx
, NULL
, "debug_level", handle_debug_level_command
,
198 COMMAND_ANY
, "adjust debug level <0-3>");
203 int log_init(struct command_context_s
*cmd_ctx
)
205 /* set defaults for daemon configuration, if not set by cmdline or cfgfile */
206 if (debug_level
== -1)
207 debug_level
= LOG_INFO
;
209 if (log_output
== NULL
)
217 int set_log_output(struct command_context_s
*cmd_ctx
, FILE *output
)
223 /* add/remove log callback handler */
224 int log_add_callback(log_callback_fn fn
, void *priv
)
228 /* prevent the same callback to be registered more than once, just for sure */
229 for (cb
= log_callbacks
; cb
; cb
= cb
->next
)
231 if (cb
->fn
== fn
&& cb
->priv
== priv
)
232 return ERROR_INVALID_ARGUMENTS
;
235 /* alloc memory, it is safe just to return in case of an error, no need for the caller to check this */
236 if ((cb
= malloc(sizeof(log_callback_t
))) == NULL
)
237 return ERROR_BUF_TOO_SMALL
;
239 /* add item to the beginning of the linked list */
242 cb
->next
= log_callbacks
;
248 int log_remove_callback(log_callback_fn fn
, void *priv
)
250 log_callback_t
*cb
, **p
;
252 for (p
= &log_callbacks
; (cb
= *p
); p
= &(*p
)->next
)
254 if (cb
->fn
== fn
&& cb
->priv
== priv
)
263 return ERROR_INVALID_ARGUMENTS
;
266 /* return allocated string w/printf() result */
267 char *alloc_printf(const char *fmt
, va_list ap
)
269 /* no buffer at the beginning, force realloc to do the job */
272 /* start with minimal length to exercise all the code paths */
277 size
*= 2; /* double the buffer size */
280 string
= realloc(string
, size
);
289 va_copy(ap_copy
, ap
);
292 ret
= vsnprintf(string
, size
, fmt
, ap_copy
);
293 /* NB! The result of the vsnprintf() might be an *EMPTY* string! */
294 if ((ret
>= 0) && ((ret
+ 1) < size
))
297 /* there was just enough or not enough space, allocate more in the next round */
300 /* the returned buffer is by principle guaranteed to be at least one character longer */
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