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ngx_log.h
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1 
2 /*
3  * Copyright (C) Igor Sysoev
4  * Copyright (C) Nginx, Inc.
5  */
6 
7 
8 #ifndef _NGX_LOG_H_INCLUDED_
9 #define _NGX_LOG_H_INCLUDED_
10 
11 
12 #include <ngx_config.h>
13 #include <ngx_core.h>
14 
15 
16 #define NGX_LOG_STDERR 0
17 #define NGX_LOG_EMERG 1
18 #define NGX_LOG_ALERT 2
19 #define NGX_LOG_CRIT 3
20 #define NGX_LOG_ERR 4
21 #define NGX_LOG_WARN 5
22 #define NGX_LOG_NOTICE 6
23 #define NGX_LOG_INFO 7
24 #define NGX_LOG_DEBUG 8
25 
26 #define NGX_LOG_DEBUG_CORE 0x010
27 #define NGX_LOG_DEBUG_ALLOC 0x020
28 #define NGX_LOG_DEBUG_MUTEX 0x040
29 #define NGX_LOG_DEBUG_EVENT 0x080
30 #define NGX_LOG_DEBUG_HTTP 0x100
31 #define NGX_LOG_DEBUG_MAIL 0x200
32 #define NGX_LOG_DEBUG_MYSQL 0x400
33 
34 /*
35  * do not forget to update debug_levels[] in src/core/ngx_log.c
36  * after the adding a new debug level
37  */
38 
39 #define NGX_LOG_DEBUG_FIRST NGX_LOG_DEBUG_CORE
40 #define NGX_LOG_DEBUG_LAST NGX_LOG_DEBUG_MYSQL
41 #define NGX_LOG_DEBUG_CONNECTION 0x80000000
42 #define NGX_LOG_DEBUG_ALL 0x7ffffff0
43 
44 
45 typedef u_char *(*ngx_log_handler_pt) (ngx_log_t *log, u_char *buf, size_t len);
46 
47 
48 struct ngx_log_s {
49  ngx_uint_t log_level;
50  ngx_open_file_t *file;
51 
52  ngx_atomic_uint_t connection;
53 
54  ngx_log_handler_pt handler;
55  void *data;
56 
57  /*
58  * we declare "action" as "char *" because the actions are usually
59  * the static strings and in the "u_char *" case we have to override
60  * their types all the time
61  */
62 
63  char *action;
64 };
65 
66 
67 #define NGX_MAX_ERROR_STR 2048
68 
69 
70 /*********************************/
71 
72 #if (NGX_HAVE_C99_VARIADIC_MACROS)
73 
74 #define NGX_HAVE_VARIADIC_MACROS 1
75 
76 #define ngx_log_error(level, log, ...) \
77  if ((log)->log_level >= level) ngx_log_error_core(level, log, __VA_ARGS__)
78 
79 void ngx_log_error_core(ngx_uint_t level, ngx_log_t *log, ngx_err_t err,
80  const char *fmt, ...);
81 
82 #define ngx_log_debug(level, log, ...) \
83  if ((log)->log_level & level) \
84  ngx_log_error_core(NGX_LOG_DEBUG, log, __VA_ARGS__)
85 
86 /*********************************/
87 
88 #elif (NGX_HAVE_GCC_VARIADIC_MACROS)
89 
90 #define NGX_HAVE_VARIADIC_MACROS 1
91 
92 #define ngx_log_error(level, log, args...) \
93  if ((log)->log_level >= level) ngx_log_error_core(level, log, args)
94 
95 void ngx_log_error_core(ngx_uint_t level, ngx_log_t *log, ngx_err_t err,
96  const char *fmt, ...);
97 
98 #define ngx_log_debug(level, log, args...) \
99  if ((log)->log_level & level) \
100  ngx_log_error_core(NGX_LOG_DEBUG, log, args)
101 
102 /*********************************/
103 
104 #else /* NO VARIADIC MACROS */
105 
106 #define NGX_HAVE_VARIADIC_MACROS 0
107 
108 void ngx_cdecl ngx_log_error(ngx_uint_t level, ngx_log_t *log, ngx_err_t err,
109  const char *fmt, ...);
110 void ngx_log_error_core(ngx_uint_t level, ngx_log_t *log, ngx_err_t err,
111  const char *fmt, va_list args);
112 void ngx_cdecl ngx_log_debug_core(ngx_log_t *log, ngx_err_t err,
113  const char *fmt, ...);
114 
115 
116 #endif /* VARIADIC MACROS */
117 
118 
119 /*********************************/
120 
121 #if (NGX_DEBUG)
122 
123 #if (NGX_HAVE_VARIADIC_MACROS)
124 
125 #define ngx_log_debug0(level, log, err, fmt) \
126  ngx_log_debug(level, log, err, fmt)
127 
128 #define ngx_log_debug1(level, log, err, fmt, arg1) \
129  ngx_log_debug(level, log, err, fmt, arg1)
130 
131 #define ngx_log_debug2(level, log, err, fmt, arg1, arg2) \
132  ngx_log_debug(level, log, err, fmt, arg1, arg2)
133 
134 #define ngx_log_debug3(level, log, err, fmt, arg1, arg2, arg3) \
135  ngx_log_debug(level, log, err, fmt, arg1, arg2, arg3)
136 
137 #define ngx_log_debug4(level, log, err, fmt, arg1, arg2, arg3, arg4) \
138  ngx_log_debug(level, log, err, fmt, arg1, arg2, arg3, arg4)
139 
140 #define ngx_log_debug5(level, log, err, fmt, arg1, arg2, arg3, arg4, arg5) \
141  ngx_log_debug(level, log, err, fmt, arg1, arg2, arg3, arg4, arg5)
142 
143 #define ngx_log_debug6(level, log, err, fmt, \
144  arg1, arg2, arg3, arg4, arg5, arg6) \
145  ngx_log_debug(level, log, err, fmt, \
146  arg1, arg2, arg3, arg4, arg5, arg6)
147 
148 #define ngx_log_debug7(level, log, err, fmt, \
149  arg1, arg2, arg3, arg4, arg5, arg6, arg7) \
150  ngx_log_debug(level, log, err, fmt, \
151  arg1, arg2, arg3, arg4, arg5, arg6, arg7)
152 
153 #define ngx_log_debug8(level, log, err, fmt, \
154  arg1, arg2, arg3, arg4, arg5, arg6, arg7, arg8) \
155  ngx_log_debug(level, log, err, fmt, \
156  arg1, arg2, arg3, arg4, arg5, arg6, arg7, arg8)
157 
158 
159 #else /* NO VARIADIC MACROS */
160 
161 #define ngx_log_debug0(level, log, err, fmt) \
162  if ((log)->log_level & level) \
163  ngx_log_debug_core(log, err, fmt)
164 
165 #define ngx_log_debug1(level, log, err, fmt, arg1) \
166  if ((log)->log_level & level) \
167  ngx_log_debug_core(log, err, fmt, arg1)
168 
169 #define ngx_log_debug2(level, log, err, fmt, arg1, arg2) \
170  if ((log)->log_level & level) \
171  ngx_log_debug_core(log, err, fmt, arg1, arg2)
172 
173 #define ngx_log_debug3(level, log, err, fmt, arg1, arg2, arg3) \
174  if ((log)->log_level & level) \
175  ngx_log_debug_core(log, err, fmt, arg1, arg2, arg3)
176 
177 #define ngx_log_debug4(level, log, err, fmt, arg1, arg2, arg3, arg4) \
178  if ((log)->log_level & level) \
179  ngx_log_debug_core(log, err, fmt, arg1, arg2, arg3, arg4)
180 
181 #define ngx_log_debug5(level, log, err, fmt, arg1, arg2, arg3, arg4, arg5) \
182  if ((log)->log_level & level) \
183  ngx_log_debug_core(log, err, fmt, arg1, arg2, arg3, arg4, arg5)
184 
185 #define ngx_log_debug6(level, log, err, fmt, \
186  arg1, arg2, arg3, arg4, arg5, arg6) \
187  if ((log)->log_level & level) \
188  ngx_log_debug_core(log, err, fmt, arg1, arg2, arg3, arg4, arg5, arg6)
189 
190 #define ngx_log_debug7(level, log, err, fmt, \
191  arg1, arg2, arg3, arg4, arg5, arg6, arg7) \
192  if ((log)->log_level & level) \
193  ngx_log_debug_core(log, err, fmt, \
194  arg1, arg2, arg3, arg4, arg5, arg6, arg7)
195 
196 #define ngx_log_debug8(level, log, err, fmt, \
197  arg1, arg2, arg3, arg4, arg5, arg6, arg7, arg8) \
198  if ((log)->log_level & level) \
199  ngx_log_debug_core(log, err, fmt, \
200  arg1, arg2, arg3, arg4, arg5, arg6, arg7, arg8)
201 
202 #endif
203 
204 #else /* NO NGX_DEBUG */
205 
206 #define ngx_log_debug0(level, log, err, fmt)
207 #define ngx_log_debug1(level, log, err, fmt, arg1)
208 #define ngx_log_debug2(level, log, err, fmt, arg1, arg2)
209 #define ngx_log_debug3(level, log, err, fmt, arg1, arg2, arg3)
210 #define ngx_log_debug4(level, log, err, fmt, arg1, arg2, arg3, arg4)
211 #define ngx_log_debug5(level, log, err, fmt, arg1, arg2, arg3, arg4, arg5)
212 #define ngx_log_debug6(level, log, err, fmt, arg1, arg2, arg3, arg4, arg5, arg6)
213 #define ngx_log_debug7(level, log, err, fmt, arg1, arg2, arg3, arg4, arg5, \
214  arg6, arg7)
215 #define ngx_log_debug8(level, log, err, fmt, arg1, arg2, arg3, arg4, arg5, \
216  arg6, arg7, arg8)
217 
218 #endif
219 
220 /*********************************/
221 
222 ngx_log_t *ngx_log_init(u_char *prefix);
223 ngx_log_t *ngx_log_create(ngx_cycle_t *cycle, ngx_str_t *name);
224 char *ngx_log_set_levels(ngx_conf_t *cf, ngx_log_t *log);
225 void ngx_cdecl ngx_log_abort(ngx_err_t err, const char *fmt, ...);
226 void ngx_cdecl ngx_log_stderr(ngx_err_t err, const char *fmt, ...);
227 u_char *ngx_log_errno(u_char *buf, u_char *last, ngx_err_t err);
228 
229 
230 /*
231  * ngx_write_stderr() cannot be implemented as macro, since
232  * MSVC does not allow to use #ifdef inside macro parameters.
233  *
234  * ngx_write_fd() is used instead of ngx_write_console(), since
235  * CharToOemBuff() inside ngx_write_console() cannot be used with
236  * read only buffer as destination and CharToOemBuff() is not needed
237  * for ngx_write_stderr() anyway.
238  */
239 static ngx_inline void
240 ngx_write_stderr(char *text)
241 {
242  (void) ngx_write_fd(ngx_stderr, text, strlen(text));
243 }
244 
245 
246 extern ngx_module_t ngx_errlog_module;
247 extern ngx_uint_t ngx_use_stderr;
248 
249 
250 #endif /* _NGX_LOG_H_INCLUDED_ */
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