1 /*
2 * SysDB - src/include/core/error.h
3 * Copyright (C) 2013 Sebastian 'tokkee' Harl <sh@tokkee.org>
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
16 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
17 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
18 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR
19 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
20 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
21 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
22 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
23 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
24 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
25 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26 */
28 /*
29 * SysDB error handling:
30 * Error handling in SysDB is done on a by-thread basis, that is, each thread
31 * will use its own memory region to store information about the last reported
32 * error.
33 * Once the error message has been passed to SysDB, it will log the entire
34 * message at once. XXX: currently, SysDB only supports printing the error to
35 * the standard error channel; support for other logging backends will be
36 * added later in a modular fashion.
37 */
39 #ifndef SDB_CORE_ERROR_H
40 #define SDB_CORE_ERROR_H 1
42 #include <stddef.h>
44 #ifdef __cplusplus
45 extern "C" {
46 #endif
48 /* max length of any error message */
49 #ifndef SDB_MAX_ERROR
50 # define SDB_MAX_ERROR 4096
51 #endif /* ! SDB_MAX_ERROR */
53 /* On Linux systems and possibly others, this should be the same as the LOG_
54 * constants defined by syslog. */
55 enum {
56 SDB_LOG_EMERG = 0,
57 SDB_LOG_ERR = 3,
58 SDB_LOG_WARNING = 4,
59 SDB_LOG_NOTICE = 5,
60 SDB_LOG_INFO = 6,
61 SDB_LOG_DEBUG = 7,
62 };
63 #define SDB_LOG_PRIO_TO_STRING(prio) \
64 (((prio) == SDB_LOG_EMERG) ? "EMERG" \
65 : ((prio) == SDB_LOG_ERR) ? "ERROR" \
66 : ((prio) == SDB_LOG_WARNING) ? "WARNING" \
67 : ((prio) == SDB_LOG_NOTICE) ? "NOTICE" \
68 : ((prio) == SDB_LOG_INFO) ? "INFO" \
69 : ((prio) == SDB_LOG_DEBUG) ? "DEBUG" : "UNKNOWN")
71 /*
72 * sdb_log:
73 * Log the specified message. The string will be formatted in printf-style
74 * using the specified format and arguments and logged with the specified
75 * priority. In addition, the error message will be stored as the current
76 * error message. This function is basically the same as calling sdb_error_set
77 * and sdb_error_log. XXX: SDB_LOG_EMERG might, at some point and/or depending
78 * on configuration, try a clean shut-down of the process.
79 */
80 int
81 sdb_log(int prio, const char *fmt, ...);
83 /*
84 * sdb_error_set, sdb_error_append:
85 * Compose the current error message. The string will be formatted in printf-
86 * style using the specified format and arguments. No automatic logging will
87 * be done.
88 */
89 int
90 sdb_error_set(const char *fmt, ...);
91 int
92 sdb_error_append(const char *fmt, ...);
94 /*
95 * sdb_error_chomp:
96 * Remove all consecutive newline characters at the end of the error message.
97 */
98 int
99 sdb_error_chomp(void);
101 /*
102 * sdb_error_log:
103 * Log the current error message with the specified priority. See sdb_log for
104 * more information.
105 */
106 int
107 sdb_error_log(int prio);
109 /*
110 * sdb_error_get:
111 * Get the current error message. The string returned by this function is
112 * owned by SysDB and might point to static memory -- do not modify or free
113 * it.
114 */
115 const char *
116 sdb_error_get(void);
118 /*
119 * sdb_error_get_prio:
120 * Get the priority of the last logged error message -- see the SDB_LOG_
121 * constants for details.
122 */
123 int
124 sdb_error_get_prio(void);
126 /*
127 * sdb_strerror:
128 * This is a wrapper around the system's strerror function which ensures that
129 * a pointer to the formatted error message is returned.
130 */
131 char *
132 sdb_strerror(int errnum, char *strerrbuf, size_t buflen);
134 #ifdef __cplusplus
135 } /* extern "C" */
136 #endif
138 #endif /* ! SDB_CORE_ERROR_H */
140 /* vim: set tw=78 sw=4 ts=4 noexpandtab : */