2 * collectd - src/common.h
3 * Copyright (C) 2005-2014 Florian octo Forster
5 * Permission is hereby granted, free of charge, to any person obtaining a
6 * copy of this software and associated documentation files (the "Software"),
7 * to deal in the Software without restriction, including without limitation
8 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
9 * and/or sell copies of the Software, and to permit persons to whom the
10 * Software is furnished to do so, subject to the following conditions:
12 * The above copyright notice and this permission notice shall be included in
13 * all copies or substantial portions of the Software.
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
18 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
20 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
21 * DEALINGS IN THE SOFTWARE.
24 * Florian octo Forster <octo at collectd.org>
25 * Niki W. Waibel <niki.waibel@gmx.net>
46 #define STATIC_ARRAY_SIZE(a) (sizeof (a) / sizeof (*(a)))
48 #define IS_TRUE(s) ((strcasecmp ("true", (s)) == 0) \
49 || (strcasecmp ("yes", (s)) == 0) \
50 || (strcasecmp ("on", (s)) == 0))
51 #define IS_FALSE(s) ((strcasecmp ("false", (s)) == 0) \
52 || (strcasecmp ("no", (s)) == 0) \
53 || (strcasecmp ("off", (s)) == 0))
55 struct rate_to_value_state_s
61 typedef struct rate_to_value_state_s rate_to_value_state_t;
63 struct value_to_rate_state_s
68 typedef struct value_to_rate_state_s value_to_rate_state_t;
70 char *sstrncpy (char *dest, const char *src, size_t n);
72 __attribute__ ((format(printf,3,4)))
73 int ssnprintf (char *dest, size_t n, const char *format, ...);
75 __attribute__ ((format(printf,1,2)))
76 char *ssnprintf_alloc (char const *format, ...);
78 char *sstrdup(const char *s);
79 void *smalloc(size_t size);
80 char *sstrerror (int errnum, char *buf, size_t buflen);
87 * Reads exactly `n' bytes or fails. Syntax and other behavior is analogous
88 * to `read(2)'. If EOF is received the file descriptor is closed and an
92 * `fd' File descriptor to write to.
93 * `buf' Buffer that is to be written.
94 * `count' Number of bytes in the buffer.
97 * Zero upon success or non-zero if an error occurred. `errno' is set in this
100 ssize_t sread (int fd, void *buf, size_t count);
107 * Writes exactly `n' bytes or fails. Syntax and other behavior is analogous
111 * `fd' File descriptor to write to.
112 * `buf' Buffer that is to be written.
113 * `count' Number of bytes in the buffer.
116 * Zero upon success or non-zero if an error occurred. `errno' is set in this
119 ssize_t swrite (int fd, const void *buf, size_t count);
126 * Splits a string into parts and stores pointers to the parts in `fields'.
127 * The characters split at are: " ", "\t", "\r", and "\n".
130 * `string' String to split. This string will be modified. `fields' will
131 * contain pointers to parts of this string, so free'ing it
132 * will destroy `fields' as well.
133 * `fields' Array of strings where pointers to the parts will be stored.
134 * `size' Number of elements in the array. No more than `size'
135 * pointers will be stored in `fields'.
138 * Returns the number of parts stored in `fields'.
140 int strsplit (char *string, char **fields, size_t size);
147 * Joins together several parts of a string using `sep' as a separator. This
148 * is equivalent to the Perl built-in `join'.
151 * `dst' Buffer where the result is stored.
152 * `dst_len' Length of the destination buffer. No more than this many
153 * bytes will be written to the memory pointed to by `dst',
154 * including the trailing null-byte.
155 * `fields' Array of strings to be joined.
156 * `fields_num' Number of elements in the `fields' array.
157 * `sep' String to be inserted between any two elements of `fields'.
158 * This string is neither prepended nor appended to the result.
159 * Instead of passing "" (empty string) one can pass NULL.
162 * Returns the number of characters in `dst', NOT including the trailing
163 * null-byte. If an error occurred (empty array or `dst' too small) a value
164 * smaller than zero will be returned.
166 int strjoin (char *dst, size_t dst_len, char **fields, size_t fields_num, const char *sep);
173 * Removes slashes ("/") from "buffer". If buffer contains a single slash,
174 * the result will be "root". Leading slashes are removed. All other slashes
175 * are replaced with underscores ("_").
176 * This function is used by plugin_dispatch_values() to escape all parts of
180 * `buffer' String to be escaped.
181 * `buffer_size' Size of the buffer. No more then this many bytes will be
182 * written to `buffer', including the trailing null-byte.
185 * Returns zero upon success and a value smaller than zero upon failure.
187 int escape_slashes (char *buffer, size_t buffer_size);
194 * Replaces any special characters (anything that's not alpha-numeric or a
195 * dash) with an underscore.
197 * E.g. "foo$bar&" would become "foo_bar_".
200 * `buffer' String to be handled.
201 * `buffer_size' Length of the string. The function returns after
202 * encountering a null-byte or reading this many bytes.
204 void replace_special (char *buffer, size_t buffer_size);
206 int strsubstitute (char *str, char c_from, char c_to);
213 * Replaces any escaped characters in a string with the appropriate special
214 * characters. The following escaped characters are recognized:
218 * \r -> <carriage return>
220 * For all other escacped characters only the backslash will be removed.
223 * `buf' String to be unescaped.
224 * `buf_len' Length of the string, including the terminating null-byte.
227 * Returns zero upon success, a value less than zero else.
229 int strunescape (char *buf, size_t buf_len);
232 * Removed trailing newline characters (CR and LF) from buffer, which must be
233 * null terminated. Returns the length of the resulting string.
235 __attribute__((nonnull (1)))
236 size_t strstripnewline (char *buffer);
243 * Compare the two time values `tv0' and `tv1' and store the absolut value
244 * of the difference in the time value pointed to by `delta' if it does not
248 * Returns an integer less than, equal to, or greater than zero if `tv0' is
249 * less than, equal to, or greater than `tv1' respectively.
251 int timeval_cmp (struct timeval tv0, struct timeval tv1, struct timeval *delta);
253 /* make sure tv_usec stores less than a second */
254 #define NORMALIZE_TIMEVAL(tv) \
256 (tv).tv_sec += (tv).tv_usec / 1000000; \
257 (tv).tv_usec = (tv).tv_usec % 1000000; \
260 /* make sure tv_sec stores less than a second */
261 #define NORMALIZE_TIMESPEC(tv) \
263 (tv).tv_sec += (tv).tv_nsec / 1000000000; \
264 (tv).tv_nsec = (tv).tv_nsec % 1000000000; \
267 int check_create_dir (const char *file_orig);
270 int get_kstat (kstat_t **ksp_ptr, char *module, int instance, char *name);
271 long long get_kstat_value (kstat_t *ksp, char *name);
275 unsigned long long ntohll (unsigned long long n);
276 unsigned long long htonll (unsigned long long n);
279 #if FP_LAYOUT_NEED_NOTHING
280 # define ntohd(d) (d)
281 # define htond(d) (d)
282 #elif FP_LAYOUT_NEED_ENDIANFLIP || FP_LAYOUT_NEED_INTSWAP
283 double ntohd (double d);
284 double htond (double d);
286 # error "Don't know how to convert between host and network representation of doubles."
289 int format_name (char *ret, int ret_len,
290 const char *hostname,
291 const char *plugin, const char *plugin_instance,
292 const char *type, const char *type_instance);
293 #define FORMAT_VL(ret, ret_len, vl) \
294 format_name (ret, ret_len, (vl)->host, (vl)->plugin, (vl)->plugin_instance, \
295 (vl)->type, (vl)->type_instance)
296 int format_values (char *ret, size_t ret_len,
297 const data_set_t *ds, const value_list_t *vl,
300 int parse_identifier (char *str, char **ret_host,
301 char **ret_plugin, char **ret_plugin_instance,
302 char **ret_type, char **ret_type_instance);
303 int parse_identifier_vl (const char *str, value_list_t *vl);
304 int parse_value (const char *value, value_t *ret_value, int ds_type);
305 int parse_values (char *buffer, value_list_t *vl, const data_set_t *ds);
308 int getpwnam_r (const char *name, struct passwd *pwbuf, char *buf,
309 size_t buflen, struct passwd **pwbufp);
312 int notification_init (notification_t *n, int severity, const char *message,
314 const char *plugin, const char *plugin_instance,
315 const char *type, const char *type_instance);
316 #define NOTIFICATION_INIT_VL(n, vl) \
317 notification_init (n, NOTIF_FAILURE, NULL, \
318 (vl)->host, (vl)->plugin, (vl)->plugin_instance, \
319 (vl)->type, (vl)->type_instance)
321 typedef int (*dirwalk_callback_f)(const char *dirname, const char *filename,
323 int walk_directory (const char *dir, dirwalk_callback_f callback,
324 void *user_data, int hidden);
325 /* Returns the number of bytes read or negative on error. */
326 ssize_t read_file_contents (char const *filename, char *buf, size_t bufsize);
328 counter_t counter_diff (counter_t old_value, counter_t new_value);
330 /* Convert a rate back to a value_t. When converting to a derive_t, counter_t
331 * or absoltue_t, take fractional residuals into account. This is important
332 * when scaling counters, for example.
333 * Returns zero on success. Returns EAGAIN when called for the first time; in
334 * this case the value_t is invalid and the next call should succeed. Other
335 * return values indicate an error. */
336 int rate_to_value (value_t *ret_value, gauge_t rate,
337 rate_to_value_state_t *state, int ds_type, cdtime_t t);
339 int value_to_rate (value_t *ret_rate, derive_t value,
340 value_to_rate_state_t *state, int ds_type, cdtime_t t);
342 /* Converts a service name (a string) to a port number
343 * (in the range [1-65535]). Returns less than zero on error. */
344 int service_name_to_port_number (const char *service_name);
346 /** Parse a string to a derive_t value. Returns zero on success or non-zero on
347 * failure. If failure is returned, ret_value is not touched. */
348 int strtoderive (const char *string, derive_t *ret_value);
350 int strarray_add (char ***ret_array, size_t *ret_array_len, char const *str);
351 void strarray_free (char **array, size_t array_len);
353 #endif /* COMMON_H */