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"
35 static FILE* log_output
;
36 static log_callback_t
*log_callbacks
= NULL
;
38 static long long start
;
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
)
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 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
, ...)
118 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
, ...)
139 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 */
281 string
= realloc(string
, size
);
289 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
);
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