2 * collectd - src/common.h
3 * Copyright (C) 2005-2010 Florian octo Forster
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License as published by the
7 * Free Software Foundation; only version 2 of the License is applicable.
9 * This program is distributed in the hope that it will be useful, but
10 * WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * General Public License for more details.
14 * You should have received a copy of the GNU General Public License along
15 * with this program; if not, write to the Free Software Foundation, Inc.,
16 * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
19 * Florian octo Forster <octo at collectd.org>
20 * Niki W. Waibel <niki.waibel@gmx.net>
41 #define STATIC_ARRAY_SIZE(a) (sizeof (a) / sizeof (*(a)))
43 #define IS_TRUE(s) ((strcasecmp ("true", (s)) == 0) \
44 || (strcasecmp ("yes", (s)) == 0) \
45 || (strcasecmp ("on", (s)) == 0))
46 #define IS_FALSE(s) ((strcasecmp ("false", (s)) == 0) \
47 || (strcasecmp ("no", (s)) == 0) \
48 || (strcasecmp ("off", (s)) == 0))
50 struct rate_to_value_state_s
56 typedef struct rate_to_value_state_s rate_to_value_state_t;
58 char *sstrncpy (char *dest, const char *src, size_t n);
59 int ssnprintf (char *dest, size_t n, const char *format, ...);
60 char *sstrdup(const char *s);
61 void *smalloc(size_t size);
62 char *sstrerror (int errnum, char *buf, size_t buflen);
69 * Reads exactly `n' bytes or fails. Syntax and other behavior is analogous
70 * to `read(2)'. If EOF is received the file descriptor is closed and an
74 * `fd' File descriptor to write to.
75 * `buf' Buffer that is to be written.
76 * `count' Number of bytes in the buffer.
79 * Zero upon success or non-zero if an error occurred. `errno' is set in this
82 ssize_t sread (int fd, void *buf, size_t count);
89 * Writes exactly `n' bytes or fails. Syntax and other behavior is analogous
93 * `fd' File descriptor to write to.
94 * `buf' Buffer that is to be written.
95 * `count' Number of bytes in the buffer.
98 * Zero upon success or non-zero if an error occurred. `errno' is set in this
101 ssize_t swrite (int fd, const void *buf, size_t count);
108 * Splits a string into parts and stores pointers to the parts in `fields'.
109 * The characters split at are: " ", "\t", "\r", and "\n".
112 * `string' String to split. This string will be modified. `fields' will
113 * contain pointers to parts of this string, so free'ing it
114 * will destroy `fields' as well.
115 * `fields' Array of strings where pointers to the parts will be stored.
116 * `size' Number of elements in the array. No more than `size'
117 * pointers will be stored in `fields'.
120 * Returns the number of parts stored in `fields'.
122 int strsplit (char *string, char **fields, size_t size);
129 * Joins together several parts of a string using `sep' as a separator. This
130 * is equivalent to the Perl built-in `join'.
133 * `dst' Buffer where the result is stored.
134 * `dst_len' Length of the destination buffer. No more than this many
135 * bytes will be written to the memory pointed to by `dst',
136 * including the trailing null-byte.
137 * `fields' Array of strings to be joined.
138 * `fields_num' Number of elements in the `fields' array.
139 * `sep' String to be inserted between any two elements of `fields'.
140 * This string is neither prepended nor appended to the result.
141 * Instead of passing "" (empty string) one can pass NULL.
144 * Returns the number of characters in `dst', NOT including the trailing
145 * null-byte. If an error occurred (empty array or `dst' too small) a value
146 * smaller than zero will be returned.
148 int strjoin (char *dst, size_t dst_len, char **fields, size_t fields_num, const char *sep);
155 * Removes slashes from the string `buf' and substitutes them with something
156 * appropriate. This function should be used whenever a path is to be used as
157 * (part of) an instance.
160 * `buf' String to be escaped.
161 * `buf_len' Length of the buffer. No more then this many bytes will be
162 * written to `buf', including the trailing null-byte.
165 * Returns zero upon success and a value smaller than zero upon failure.
167 int escape_slashes (char *buf, int buf_len);
174 * Replaces any special characters (anything that's not alpha-numeric or a
175 * dash) with an underscore.
177 * E.g. "foo$bar&" would become "foo_bar_".
180 * `buffer' String to be handled.
181 * `buffer_size' Length of the string. The function returns after
182 * encountering a null-byte or reading this many bytes.
184 void replace_special (char *buffer, size_t buffer_size);
186 int strsubstitute (char *str, char c_from, char c_to);
193 * Replaces any escaped characters in a string with the appropriate special
194 * characters. The following escaped characters are recognized:
198 * \r -> <carriage return>
200 * For all other escacped characters only the backslash will be removed.
203 * `buf' String to be unescaped.
204 * `buf_len' Length of the string, including the terminating null-byte.
207 * Returns zero upon success, a value less than zero else.
209 int strunescape (char *buf, size_t buf_len);
212 * Removed trailing newline characters (CR and LF) from buffer, which must be
213 * null terminated. Returns the length of the resulting string.
215 __attribute__((nonnull (1)))
216 size_t strstripnewline (char *buffer);
223 * Compare the two time values `tv0' and `tv1' and store the absolut value
224 * of the difference in the time value pointed to by `delta' if it does not
228 * Returns an integer less than, equal to, or greater than zero if `tv0' is
229 * less than, equal to, or greater than `tv1' respectively.
231 int timeval_cmp (struct timeval tv0, struct timeval tv1, struct timeval *delta);
233 /* make sure tv_usec stores less than a second */
234 #define NORMALIZE_TIMEVAL(tv) \
236 (tv).tv_sec += (tv).tv_usec / 1000000; \
237 (tv).tv_usec = (tv).tv_usec % 1000000; \
240 /* make sure tv_sec stores less than a second */
241 #define NORMALIZE_TIMESPEC(tv) \
243 (tv).tv_sec += (tv).tv_nsec / 1000000000; \
244 (tv).tv_nsec = (tv).tv_nsec % 1000000000; \
247 int check_create_dir (const char *file_orig);
250 int get_kstat (kstat_t **ksp_ptr, char *module, int instance, char *name);
251 long long get_kstat_value (kstat_t *ksp, char *name);
255 unsigned long long ntohll (unsigned long long n);
256 unsigned long long htonll (unsigned long long n);
259 #if FP_LAYOUT_NEED_NOTHING
260 # define ntohd(d) (d)
261 # define htond(d) (d)
262 #elif FP_LAYOUT_NEED_ENDIANFLIP || FP_LAYOUT_NEED_INTSWAP
263 double ntohd (double d);
264 double htond (double d);
266 # error "Don't know how to convert between host and network representation of doubles."
269 int format_name (char *ret, int ret_len,
270 const char *hostname,
271 const char *plugin, const char *plugin_instance,
272 const char *type, const char *type_instance);
273 #define FORMAT_VL(ret, ret_len, vl) \
274 format_name (ret, ret_len, (vl)->host, (vl)->plugin, (vl)->plugin_instance, \
275 (vl)->type, (vl)->type_instance)
276 int format_values (char *ret, size_t ret_len,
277 const data_set_t *ds, const value_list_t *vl,
280 int parse_identifier (char *str, char **ret_host,
281 char **ret_plugin, char **ret_plugin_instance,
282 char **ret_type, char **ret_type_instance);
283 int parse_identifier_vl (const char *str, value_list_t *vl);
284 int parse_value (const char *value, value_t *ret_value, int ds_type);
285 int parse_values (char *buffer, value_list_t *vl, const data_set_t *ds);
288 int getpwnam_r (const char *name, struct passwd *pwbuf, char *buf,
289 size_t buflen, struct passwd **pwbufp);
292 int notification_init (notification_t *n, int severity, const char *message,
294 const char *plugin, const char *plugin_instance,
295 const char *type, const char *type_instance);
296 #define NOTIFICATION_INIT_VL(n, vl) \
297 notification_init (n, NOTIF_FAILURE, NULL, \
298 (vl)->host, (vl)->plugin, (vl)->plugin_instance, \
299 (vl)->type, (vl)->type_instance)
301 typedef int (*dirwalk_callback_f)(const char *dirname, const char *filename,
303 int walk_directory (const char *dir, dirwalk_callback_f callback,
304 void *user_data, int hidden);
305 /* Returns the number of bytes read or negative on error. */
306 int read_file_contents (const char *filename, char *buf, int bufsize);
308 counter_t counter_diff (counter_t old_value, counter_t new_value);
310 /* Convert a rate back to a value_t. When converting to a derive_t, counter_t
311 * or absoltue_t, take fractional residuals into account. This is important
312 * when scaling counters, for example.
313 * Returns zero on success. Returns EAGAIN when called for the first time; in
314 * this case the value_t is invalid and the next call should succeed. Other
315 * return values indicate an error. */
316 int rate_to_value (value_t *ret_value, gauge_t rate,
317 rate_to_value_state_t *state, int ds_type, cdtime_t t);
319 /* Converts a service name (a string) to a port number
320 * (in the range [1-65535]). Returns less than zero on error. */
321 int service_name_to_port_number (const char *service_name);
323 /** Parse a string to a derive_t value. Returns zero on success or non-zero on
324 * failure. If failure is returned, ret_value is not touched. */
325 int strtoderive (const char *string, derive_t *ret_value);
327 int strarray_add (char ***ret_array, size_t *ret_array_len, char const *str);
328 void strarray_free (char **array, size_t array_len);
330 #endif /* COMMON_H */