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>
45 #define STATIC_ARRAY_SIZE(a) (sizeof(a) / sizeof(*(a)))
48 ((strcasecmp("true", (s)) == 0) || (strcasecmp("yes", (s)) == 0) || \
49 (strcasecmp("on", (s)) == 0))
51 ((strcasecmp("false", (s)) == 0) || (strcasecmp("no", (s)) == 0) || \
52 (strcasecmp("off", (s)) == 0))
54 struct rate_to_value_state_s {
59 typedef struct rate_to_value_state_s rate_to_value_state_t;
61 struct value_to_rate_state_s {
65 typedef struct value_to_rate_state_s value_to_rate_state_t;
67 char *sstrncpy(char *dest, const char *src, size_t n);
69 __attribute__((format(printf, 1, 2))) char *ssnprintf_alloc(char const *format,
72 char *sstrdup(const char *s);
73 void *smalloc(size_t size);
74 char *sstrerror(int errnum, char *buf, size_t buflen);
81 * Reads exactly `n' bytes or fails. Syntax and other behavior is analogous
85 * `fd' File descriptor to write to.
86 * `buf' Buffer that is to be written.
87 * `count' Number of bytes in the buffer.
90 * Zero upon success or non-zero if an error occurred. `errno' is set in this
93 ssize_t sread(int fd, void *buf, size_t count);
100 * Writes exactly `n' bytes or fails. Syntax and other behavior is analogous
104 * `fd' File descriptor to write to.
105 * `buf' Buffer that is to be written.
106 * `count' Number of bytes in the buffer.
109 * Zero upon success or non-zero if an error occurred. `errno' is set in this
112 ssize_t swrite(int fd, const void *buf, size_t count);
119 * Splits a string into parts and stores pointers to the parts in `fields'.
120 * The characters split at are: " ", "\t", "\r", and "\n".
123 * `string' String to split. This string will be modified. `fields' will
124 * contain pointers to parts of this string, so free'ing it
125 * will destroy `fields' as well.
126 * `fields' Array of strings where pointers to the parts will be stored.
127 * `size' Number of elements in the array. No more than `size'
128 * pointers will be stored in `fields'.
131 * Returns the number of parts stored in `fields'.
133 int strsplit(char *string, char **fields, size_t size);
140 * Joins together several parts of a string using `sep' as a separator. This
141 * is equivalent to the Perl built-in `join'.
144 * `dst' Buffer where the result is stored. Can be NULL if you need to
145 * determine the required buffer size only.
146 * `dst_len' Length of the destination buffer. No more than this many
147 * bytes will be written to the memory pointed to by `dst',
148 * including the trailing null-byte. Must be zero if dst is
150 * `fields' Array of strings to be joined.
151 * `fields_num' Number of elements in the `fields' array.
152 * `sep' String to be inserted between any two elements of `fields'.
153 * This string is neither prepended nor appended to the result.
154 * Instead of passing "" (empty string) one can pass NULL.
157 * Returns the number of characters in the resulting string, excluding a
158 * tailing null byte. If this value is greater than or equal to "dst_len", the
159 * result in "dst" is truncated (but still null terminated). On error a
160 * negative value is returned.
162 int strjoin(char *dst, size_t dst_len, char **fields, size_t fields_num,
170 * Removes slashes ("/") from "buffer". If buffer contains a single slash,
171 * the result will be "root". Leading slashes are removed. All other slashes
172 * are replaced with underscores ("_").
173 * This function is used by plugin_dispatch_values() to escape all parts of
177 * `buffer' String to be escaped.
178 * `buffer_size' Size of the buffer. No more then this many bytes will be
179 * written to `buffer', including the trailing null-byte.
182 * Returns zero upon success and a value smaller than zero upon failure.
184 int escape_slashes(char *buffer, size_t buffer_size);
191 * escape_string quotes and escapes a string to be usable with collectd's
192 * plain text protocol. "simple" strings are left as they are, for example if
193 * buffer is 'simple' before the call, it will remain 'simple'. However, if
194 * buffer contains 'more "complex"' before the call, the returned buffer will
195 * contain '"more \"complex\""'.
197 * If the buffer is too small to contain the escaped string, the string will
198 * be truncated. However, leading and trailing double quotes, as well as an
199 * ending null byte are guaranteed.
202 * Returns zero on success, even if the string was truncated. Non-zero on
205 int escape_string(char *buffer, size_t buffer_size);
212 * Replaces any special characters (anything that's not alpha-numeric or a
213 * dash) with an underscore.
215 * E.g. "foo$bar&" would become "foo_bar_".
218 * `buffer' String to be handled.
219 * `buffer_size' Length of the string. The function returns after
220 * encountering a null-byte or reading this many bytes.
222 void replace_special(char *buffer, size_t buffer_size);
229 * Replaces any escaped characters in a string with the appropriate special
230 * characters. The following escaped characters are recognized:
234 * \r -> <carriage return>
236 * For all other escacped characters only the backslash will be removed.
239 * `buf' String to be unescaped.
240 * `buf_len' Length of the string, including the terminating null-byte.
243 * Returns zero upon success, a value less than zero else.
245 int strunescape(char *buf, size_t buf_len);
248 * Removed trailing newline characters (CR and LF) from buffer, which must be
249 * null terminated. Returns the length of the resulting string.
251 __attribute__((nonnull(1))) size_t strstripnewline(char *buffer);
258 * Compare the two time values `tv0' and `tv1' and store the absolut value
259 * of the difference in the time value pointed to by `delta' if it does not
263 * Returns an integer less than, equal to, or greater than zero if `tv0' is
264 * less than, equal to, or greater than `tv1' respectively.
266 int timeval_cmp(struct timeval tv0, struct timeval tv1, struct timeval *delta);
268 /* make sure tv_usec stores less than a second */
269 #define NORMALIZE_TIMEVAL(tv) \
271 (tv).tv_sec += (tv).tv_usec / 1000000; \
272 (tv).tv_usec = (tv).tv_usec % 1000000; \
275 /* make sure tv_sec stores less than a second */
276 #define NORMALIZE_TIMESPEC(tv) \
278 (tv).tv_sec += (tv).tv_nsec / 1000000000; \
279 (tv).tv_nsec = (tv).tv_nsec % 1000000000; \
282 int check_create_dir(const char *file_orig);
285 int get_kstat(kstat_t **ksp_ptr, char *module, int instance, char *name);
286 long long get_kstat_value(kstat_t *ksp, char *name);
290 unsigned long long ntohll(unsigned long long n);
291 unsigned long long htonll(unsigned long long n);
294 #if FP_LAYOUT_NEED_NOTHING
297 #elif FP_LAYOUT_NEED_ENDIANFLIP || FP_LAYOUT_NEED_INTSWAP
298 double ntohd(double d);
299 double htond(double d);
302 "Don't know how to convert between host and network representation of doubles."
305 int format_name(char *ret, int ret_len, const char *hostname,
306 const char *plugin, const char *plugin_instance,
307 const char *type, const char *type_instance);
308 #define FORMAT_VL(ret, ret_len, vl) \
309 format_name(ret, ret_len, (vl)->host, (vl)->plugin, (vl)->plugin_instance, \
310 (vl)->type, (vl)->type_instance)
311 int format_values(char *ret, size_t ret_len, const data_set_t *ds,
312 const value_list_t *vl, _Bool store_rates);
314 int parse_identifier(char *str, char **ret_host, char **ret_plugin,
315 char **ret_plugin_instance, char **ret_type,
316 char **ret_type_instance, char *default_host);
317 int parse_identifier_vl(const char *str, value_list_t *vl);
318 int parse_value(const char *value, value_t *ret_value, int ds_type);
319 int parse_values(char *buffer, value_list_t *vl, const data_set_t *ds);
321 /* parse_value_file reads "path" and parses its content as an integer or
322 * floating point, depending on "ds_type". On success, the value is stored in
323 * "ret_value" and zero is returned. On failure, a non-zero value is returned.
325 int parse_value_file(char const *path, value_t *ret_value, int ds_type);
328 int getpwnam_r(const char *name, struct passwd *pwbuf, char *buf, size_t buflen,
329 struct passwd **pwbufp);
332 int notification_init(notification_t *n, int severity, const char *message,
333 const char *host, const char *plugin,
334 const char *plugin_instance, const char *type,
335 const char *type_instance);
336 #define NOTIFICATION_INIT_VL(n, vl) \
337 notification_init(n, NOTIF_FAILURE, NULL, (vl)->host, (vl)->plugin, \
338 (vl)->plugin_instance, (vl)->type, (vl)->type_instance)
340 typedef int (*dirwalk_callback_f)(const char *dirname, const char *filename,
342 int walk_directory(const char *dir, dirwalk_callback_f callback,
343 void *user_data, int hidden);
344 /* Returns the number of bytes read or negative on error. */
345 ssize_t read_file_contents(char const *filename, char *buf, size_t bufsize);
347 counter_t counter_diff(counter_t old_value, counter_t new_value);
349 /* Convert a rate back to a value_t. When converting to a derive_t, counter_t
350 * or absoltue_t, take fractional residuals into account. This is important
351 * when scaling counters, for example.
352 * Returns zero on success. Returns EAGAIN when called for the first time; in
353 * this case the value_t is invalid and the next call should succeed. Other
354 * return values indicate an error. */
355 int rate_to_value(value_t *ret_value, gauge_t rate,
356 rate_to_value_state_t *state, int ds_type, cdtime_t t);
358 int value_to_rate(gauge_t *ret_rate, value_t value, int ds_type, cdtime_t t,
359 value_to_rate_state_t *state);
361 /* Converts a service name (a string) to a port number
362 * (in the range [1-65535]). Returns less than zero on error. */
363 int service_name_to_port_number(const char *service_name);
365 /* Sets various, non-default, socket options */
366 void set_sock_opts(int sockfd);
368 /** Parse a string to a derive_t value. Returns zero on success or non-zero on
369 * failure. If failure is returned, ret_value is not touched. */
370 int strtoderive(const char *string, derive_t *ret_value);
372 /** Parse a string to a gauge_t value. Returns zero on success or non-zero on
373 * failure. If failure is returned, ret_value is not touched. */
374 int strtogauge(const char *string, gauge_t *ret_value);
376 int strarray_add(char ***ret_array, size_t *ret_array_len, char const *str);
377 void strarray_free(char **array, size_t array_len);
379 #ifdef HAVE_SYS_CAPABILITY_H
380 /** Check if the current process benefits from the capability passed in
381 * argument. Returns zero if it does, less than zero if it doesn't or on error.
382 * See capabilities(7) for the list of possible capabilities.
384 int check_capability(int arg);
385 #endif /* HAVE_SYS_CAPABILITY_H */
387 #endif /* COMMON_H */