2 * collectd - src/common.c
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>
21 * Sebastian Harl <sh at tokkee.org>
22 * Michał Mirosław <mirq-linux at rere.qmqm.pl>
32 #include "utils_cache.h"
43 #include <sys/types.h>
44 #include <sys/socket.h>
48 # include <netinet/in.h>
51 /* for ntohl and htonl */
53 # include <arpa/inet.h>
57 extern kstat_ctl_t *kc;
61 static pthread_mutex_t getpwnam_r_lock = PTHREAD_MUTEX_INITIALIZER;
65 static pthread_mutex_t strerror_r_lock = PTHREAD_MUTEX_INITIALIZER;
68 char *sstrncpy (char *dest, const char *src, size_t n)
70 strncpy (dest, src, n);
74 } /* char *sstrncpy */
76 int ssnprintf (char *dest, size_t n, const char *format, ...)
81 va_start (ap, format);
82 ret = vsnprintf (dest, n, format, ap);
89 char *sstrdup (const char *s)
97 /* Do not use `strdup' here, because it's not specified in POSIX. It's
98 * ``only'' an XSI extension. */
100 r = (char *) malloc (sizeof (char) * sz);
103 ERROR ("sstrdup: Out of memory.");
106 memcpy (r, s, sizeof (char) * sz);
109 } /* char *sstrdup */
111 /* Even though Posix requires "strerror_r" to return an "int",
112 * some systems (e.g. the GNU libc) return a "char *" _and_
113 * ignore the second argument ... -tokkee */
114 char *sstrerror (int errnum, char *buf, size_t buflen)
122 pthread_mutex_lock (&strerror_r_lock);
124 temp = strerror (errnum);
125 sstrncpy (buf, temp, buflen);
127 pthread_mutex_unlock (&strerror_r_lock);
129 /* #endif !HAVE_STRERROR_R */
131 #elif STRERROR_R_CHAR_P
134 temp = strerror_r (errnum, buf, buflen);
137 if ((temp != NULL) && (temp != buf) && (temp[0] != '\0'))
138 sstrncpy (buf, temp, buflen);
140 sstrncpy (buf, "strerror_r did not return "
141 "an error message", buflen);
144 /* #endif STRERROR_R_CHAR_P */
147 if (strerror_r (errnum, buf, buflen) != 0)
149 ssnprintf (buf, buflen, "Error #%i; "
150 "Additionally, strerror_r failed.",
153 #endif /* STRERROR_R_CHAR_P */
156 } /* char *sstrerror */
158 void *smalloc (size_t size)
162 if ((r = malloc (size)) == NULL)
164 ERROR ("Not enough memory.");
169 } /* void *smalloc */
172 void sfree (void **ptr)
184 ssize_t sread (int fd, void *buf, size_t count)
195 status = read (fd, (void *) ptr, nleft);
197 if ((status < 0) && ((errno == EAGAIN) || (errno == EINTR)))
205 DEBUG ("Received EOF from fd %i. "
206 "Closing fd and returning error.",
212 assert ((0 > status) || (nleft >= (size_t)status));
214 nleft = nleft - status;
222 ssize_t swrite (int fd, const void *buf, size_t count)
228 ptr = (const char *) buf;
233 status = write (fd, (const void *) ptr, nleft);
235 if ((status < 0) && ((errno == EAGAIN) || (errno == EINTR)))
241 nleft = nleft - status;
248 int strsplit (char *string, char **fields, size_t size)
257 while ((fields[i] = strtok_r (ptr, " \t\r\n", &saveptr)) != NULL)
269 int strjoin (char *dst, size_t dst_len,
270 char **fields, size_t fields_num,
277 memset (dst, '\0', dst_len);
284 sep_len = strlen (sep);
286 for (i = 0; i < (int)fields_num; i++)
288 if ((i > 0) && (sep_len > 0))
290 if (dst_len <= sep_len)
293 strncat (dst, sep, dst_len);
297 field_len = strlen (fields[i]);
299 if (dst_len <= field_len)
302 strncat (dst, fields[i], dst_len);
303 dst_len -= field_len;
306 return (strlen (dst));
309 int strsubstitute (char *str, char c_from, char c_to)
328 } /* int strsubstitute */
330 int strunescape (char *buf, size_t buf_len)
334 for (i = 0; (i < buf_len) && (buf[i] != '\0'); ++i)
339 if ((i >= buf_len) || (buf[i + 1] == '\0')) {
340 ERROR ("string unescape: backslash found at end of string.");
344 switch (buf[i + 1]) {
359 memmove (buf + i + 1, buf + i + 2, buf_len - i - 2);
362 } /* int strunescape */
364 size_t strstripnewline (char *buffer)
366 size_t buffer_len = strlen (buffer);
368 while (buffer_len > 0)
370 if ((buffer[buffer_len - 1] != '\n')
371 && (buffer[buffer_len - 1] != '\r'))
374 buffer[buffer_len] = 0;
378 } /* size_t strstripnewline */
380 int escape_slashes (char *buf, int buf_len)
384 if (strcmp (buf, "/") == 0)
389 strncpy (buf, "root", buf_len);
396 /* Move one to the left */
398 memmove (buf, buf + 1, buf_len - 1);
400 for (i = 0; i < buf_len - 1; i++)
404 else if (buf[i] == '/')
410 } /* int escape_slashes */
412 void replace_special (char *buffer, size_t buffer_size)
416 for (i = 0; i < buffer_size; i++)
420 if ((!isalnum ((int) buffer[i])) && (buffer[i] != '-'))
423 } /* void replace_special */
425 int timeval_cmp (struct timeval tv0, struct timeval tv1, struct timeval *delta)
427 struct timeval *larger;
428 struct timeval *smaller;
432 NORMALIZE_TIMEVAL (tv0);
433 NORMALIZE_TIMEVAL (tv1);
435 if ((tv0.tv_sec == tv1.tv_sec) && (tv0.tv_usec == tv1.tv_usec))
444 if ((tv0.tv_sec < tv1.tv_sec)
445 || ((tv0.tv_sec == tv1.tv_sec) && (tv0.tv_usec < tv1.tv_usec)))
459 delta->tv_sec = larger->tv_sec - smaller->tv_sec;
461 if (smaller->tv_usec <= larger->tv_usec)
462 delta->tv_usec = larger->tv_usec - smaller->tv_usec;
466 delta->tv_usec = 1000000 + larger->tv_usec - smaller->tv_usec;
470 assert ((delta == NULL)
471 || ((0 <= delta->tv_usec) && (delta->tv_usec < 1000000)));
474 } /* int timeval_cmp */
476 int check_create_dir (const char *file_orig)
487 int last_is_file = 1;
488 int path_is_absolute = 0;
493 * Sanity checks first
495 if (file_orig == NULL)
498 if ((len = strlen (file_orig)) < 1)
500 else if (len >= sizeof (file_copy))
504 * If `file_orig' ends in a slash the last component is a directory,
505 * otherwise it's a file. Act accordingly..
507 if (file_orig[len - 1] == '/')
509 if (file_orig[0] == '/')
510 path_is_absolute = 1;
513 * Create a copy for `strtok_r' to destroy
515 sstrncpy (file_copy, file_orig, sizeof (file_copy));
518 * Break into components. This will eat up several slashes in a row and
519 * remove leading and trailing slashes..
524 while ((fields[fields_num] = strtok_r (ptr, "/", &saveptr)) != NULL)
529 if (fields_num >= 16)
534 * For each component, do..
536 for (i = 0; i < (fields_num - last_is_file); i++)
539 * Do not create directories that start with a dot. This
540 * prevents `../../' attacks and other likely malicious
543 if (fields[i][0] == '.')
545 ERROR ("Cowardly refusing to create a directory that "
546 "begins with a `.' (dot): `%s'", file_orig);
551 * Join the components together again
554 if (strjoin (dir + path_is_absolute, dir_len - path_is_absolute,
555 fields, i + 1, "/") < 0)
557 ERROR ("strjoin failed: `%s', component #%i", file_orig, i);
562 if ((stat (dir, &statbuf) == -1)
563 && (lstat (dir, &statbuf) == -1))
567 if (mkdir (dir, S_IRWXU | S_IRWXG | S_IRWXO) == 0)
570 /* this might happen, if a different thread created
571 * the directory in the meantime
572 * => call stat() again to check for S_ISDIR() */
577 ERROR ("check_create_dir: mkdir (%s): %s", dir,
579 errbuf, sizeof (errbuf)));
585 ERROR ("check_create_dir: stat (%s): %s", dir,
586 sstrerror (errno, errbuf,
591 else if (!S_ISDIR (statbuf.st_mode))
593 ERROR ("check_create_dir: `%s' exists but is not "
594 "a directory!", dir);
602 } /* check_create_dir */
605 int get_kstat (kstat_t **ksp_ptr, char *module, int instance, char *name)
614 ssnprintf (ident, sizeof (ident), "%s,%i,%s", module, instance, name);
616 *ksp_ptr = kstat_lookup (kc, module, instance, name);
617 if (*ksp_ptr == NULL)
619 ERROR ("get_kstat: Cound not find kstat %s", ident);
623 if ((*ksp_ptr)->ks_type != KSTAT_TYPE_NAMED)
625 ERROR ("get_kstat: kstat %s has wrong type", ident);
631 assert (*ksp_ptr != NULL);
632 assert ((*ksp_ptr)->ks_type == KSTAT_TYPE_NAMED);
635 if (kstat_read (kc, *ksp_ptr, NULL) == -1)
637 ERROR ("get_kstat: kstat %s could not be read", ident);
641 if ((*ksp_ptr)->ks_type != KSTAT_TYPE_NAMED)
643 ERROR ("get_kstat: kstat %s has wrong type", ident);
650 long long get_kstat_value (kstat_t *ksp, char *name)
653 long long retval = -1LL;
657 ERROR ("get_kstat_value (\"%s\"): ksp is NULL.", name);
660 else if (ksp->ks_type != KSTAT_TYPE_NAMED)
662 ERROR ("get_kstat_value (\"%s\"): ksp->ks_type (%#x) "
663 "is not KSTAT_TYPE_NAMED (%#x).",
665 (unsigned int) ksp->ks_type,
666 (unsigned int) KSTAT_TYPE_NAMED);
670 if ((kn = (kstat_named_t *) kstat_data_lookup (ksp, name)) == NULL)
673 if (kn->data_type == KSTAT_DATA_INT32)
674 retval = (long long) kn->value.i32;
675 else if (kn->data_type == KSTAT_DATA_UINT32)
676 retval = (long long) kn->value.ui32;
677 else if (kn->data_type == KSTAT_DATA_INT64)
678 retval = (long long) kn->value.i64; /* According to ANSI C99 `long long' must hold at least 64 bits */
679 else if (kn->data_type == KSTAT_DATA_UINT64)
680 retval = (long long) kn->value.ui64; /* XXX: Might overflow! */
682 WARNING ("get_kstat_value: Not a numeric value: %s", name);
686 #endif /* HAVE_LIBKSTAT */
689 unsigned long long ntohll (unsigned long long n)
691 #if BYTE_ORDER == BIG_ENDIAN
694 return (((unsigned long long) ntohl (n)) << 32) + ntohl (n >> 32);
696 } /* unsigned long long ntohll */
698 unsigned long long htonll (unsigned long long n)
700 #if BYTE_ORDER == BIG_ENDIAN
703 return (((unsigned long long) htonl (n)) << 32) + htonl (n >> 32);
705 } /* unsigned long long htonll */
706 #endif /* HAVE_HTONLL */
708 #if FP_LAYOUT_NEED_NOTHING
709 /* Well, we need nothing.. */
710 /* #endif FP_LAYOUT_NEED_NOTHING */
712 #elif FP_LAYOUT_NEED_ENDIANFLIP || FP_LAYOUT_NEED_INTSWAP
713 # if FP_LAYOUT_NEED_ENDIANFLIP
714 # define FP_CONVERT(A) ((((uint64_t)(A) & 0xff00000000000000LL) >> 56) | \
715 (((uint64_t)(A) & 0x00ff000000000000LL) >> 40) | \
716 (((uint64_t)(A) & 0x0000ff0000000000LL) >> 24) | \
717 (((uint64_t)(A) & 0x000000ff00000000LL) >> 8) | \
718 (((uint64_t)(A) & 0x00000000ff000000LL) << 8) | \
719 (((uint64_t)(A) & 0x0000000000ff0000LL) << 24) | \
720 (((uint64_t)(A) & 0x000000000000ff00LL) << 40) | \
721 (((uint64_t)(A) & 0x00000000000000ffLL) << 56))
723 # define FP_CONVERT(A) ((((uint64_t)(A) & 0xffffffff00000000LL) >> 32) | \
724 (((uint64_t)(A) & 0x00000000ffffffffLL) << 32))
727 double ntohd (double d)
738 /* NAN in x86 byte order */
739 if ((ret.byte[0] == 0x00) && (ret.byte[1] == 0x00)
740 && (ret.byte[2] == 0x00) && (ret.byte[3] == 0x00)
741 && (ret.byte[4] == 0x00) && (ret.byte[5] == 0x00)
742 && (ret.byte[6] == 0xf8) && (ret.byte[7] == 0x7f))
751 ret.integer = FP_CONVERT (tmp);
752 return (ret.floating);
756 double htond (double d)
767 ret.byte[0] = ret.byte[1] = ret.byte[2] = ret.byte[3] = 0x00;
768 ret.byte[4] = ret.byte[5] = 0x00;
771 return (ret.floating);
778 tmp = FP_CONVERT (ret.integer);
780 return (ret.floating);
783 #endif /* FP_LAYOUT_NEED_ENDIANFLIP || FP_LAYOUT_NEED_INTSWAP */
785 int format_name (char *ret, int ret_len,
786 const char *hostname,
787 const char *plugin, const char *plugin_instance,
788 const char *type, const char *type_instance)
794 buffer_size = (size_t) ret_len;
796 #define APPEND(str) do { \
797 size_t l = strlen (str); \
798 if (l >= buffer_size) \
800 memcpy (buffer, (str), l); \
801 buffer += l; buffer_size -= l; \
804 assert (plugin != NULL);
805 assert (type != NULL);
810 if ((plugin_instance != NULL) && (plugin_instance[0] != 0))
813 APPEND (plugin_instance);
817 if ((type_instance != NULL) && (type_instance[0] != 0))
820 APPEND (type_instance);
822 assert (buffer_size > 0);
827 } /* int format_name */
829 int format_values (char *ret, size_t ret_len, /* {{{ */
830 const data_set_t *ds, const value_list_t *vl,
836 gauge_t *rates = NULL;
838 assert (0 == strcmp (ds->type, vl->type));
840 memset (ret, 0, ret_len);
842 #define BUFFER_ADD(...) do { \
843 status = ssnprintf (ret + offset, ret_len - offset, \
850 else if (((size_t) status) >= (ret_len - offset)) \
856 offset += ((size_t) status); \
859 BUFFER_ADD ("%.3f", CDTIME_T_TO_DOUBLE (vl->time));
861 for (i = 0; i < ds->ds_num; i++)
863 if (ds->ds[i].type == DS_TYPE_GAUGE)
864 BUFFER_ADD (":%f", vl->values[i].gauge);
865 else if (store_rates)
868 rates = uc_get_rate (ds, vl);
871 WARNING ("format_values: "
872 "uc_get_rate failed.");
875 BUFFER_ADD (":%g", rates[i]);
877 else if (ds->ds[i].type == DS_TYPE_COUNTER)
878 BUFFER_ADD (":%llu", vl->values[i].counter);
879 else if (ds->ds[i].type == DS_TYPE_DERIVE)
880 BUFFER_ADD (":%"PRIi64, vl->values[i].derive);
881 else if (ds->ds[i].type == DS_TYPE_ABSOLUTE)
882 BUFFER_ADD (":%"PRIu64, vl->values[i].absolute);
885 ERROR ("format_values plugin: Unknown data source type: %i",
890 } /* for ds->ds_num */
896 } /* }}} int format_values */
898 int parse_identifier (char *str, char **ret_host,
899 char **ret_plugin, char **ret_plugin_instance,
900 char **ret_type, char **ret_type_instance)
902 char *hostname = NULL;
904 char *plugin_instance = NULL;
906 char *type_instance = NULL;
909 if (hostname == NULL)
912 plugin = strchr (hostname, '/');
915 *plugin = '\0'; plugin++;
917 type = strchr (plugin, '/');
920 *type = '\0'; type++;
922 plugin_instance = strchr (plugin, '-');
923 if (plugin_instance != NULL)
925 *plugin_instance = '\0';
929 type_instance = strchr (type, '-');
930 if (type_instance != NULL)
932 *type_instance = '\0';
936 *ret_host = hostname;
937 *ret_plugin = plugin;
938 *ret_plugin_instance = plugin_instance;
940 *ret_type_instance = type_instance;
942 } /* int parse_identifier */
944 int parse_identifier_vl (const char *str, value_list_t *vl) /* {{{ */
946 char str_copy[6 * DATA_MAX_NAME_LEN];
949 char *plugin_instance = NULL;
951 char *type_instance = NULL;
954 if ((str == NULL) || (vl == NULL))
957 sstrncpy (str_copy, str, sizeof (str_copy));
959 status = parse_identifier (str_copy, &host,
960 &plugin, &plugin_instance,
961 &type, &type_instance);
965 sstrncpy (vl->host, host, sizeof (vl->host));
966 sstrncpy (vl->plugin, plugin, sizeof (vl->plugin));
967 sstrncpy (vl->plugin_instance,
968 (plugin_instance != NULL) ? plugin_instance : "",
969 sizeof (vl->plugin_instance));
970 sstrncpy (vl->type, type, sizeof (vl->type));
971 sstrncpy (vl->type_instance,
972 (type_instance != NULL) ? type_instance : "",
973 sizeof (vl->type_instance));
976 } /* }}} int parse_identifier_vl */
978 int parse_value (const char *value_orig, value_t *ret_value, int ds_type)
984 if (value_orig == NULL)
987 value = strdup (value_orig);
990 value_len = strlen (value);
992 while ((value_len > 0) && isspace ((int) value[value_len - 1]))
994 value[value_len - 1] = 0;
1000 case DS_TYPE_COUNTER:
1001 ret_value->counter = (counter_t) strtoull (value, &endptr, 0);
1005 ret_value->gauge = (gauge_t) strtod (value, &endptr);
1008 case DS_TYPE_DERIVE:
1009 ret_value->derive = (derive_t) strtoll (value, &endptr, 0);
1012 case DS_TYPE_ABSOLUTE:
1013 ret_value->absolute = (absolute_t) strtoull (value, &endptr, 0);
1018 ERROR ("parse_value: Invalid data source type: %i.", ds_type);
1022 if (value == endptr) {
1023 ERROR ("parse_value: Failed to parse string as %s: %s.",
1024 DS_TYPE_TO_STRING (ds_type), value);
1028 else if ((NULL != endptr) && ('\0' != *endptr))
1029 INFO ("parse_value: Ignoring trailing garbage \"%s\" after %s value. "
1030 "Input string was \"%s\".",
1031 endptr, DS_TYPE_TO_STRING (ds_type), value_orig);
1035 } /* int parse_value */
1037 int parse_values (char *buffer, value_list_t *vl, const data_set_t *ds)
1047 while ((ptr = strtok_r (dummy, ":", &saveptr)) != NULL)
1051 if (i >= vl->values_len)
1053 /* Make sure i is invalid. */
1054 i = vl->values_len + 1;
1060 if (strcmp ("N", ptr) == 0)
1061 vl->time = cdtime ();
1064 char *endptr = NULL;
1068 tmp = strtod (ptr, &endptr);
1069 if ((errno != 0) /* Overflow */
1070 || (endptr == ptr) /* Invalid string */
1071 || (endptr == NULL) /* This should not happen */
1072 || (*endptr != 0)) /* Trailing chars */
1075 vl->time = DOUBLE_TO_CDTIME_T (tmp);
1080 if ((strcmp ("U", ptr) == 0) && (ds->ds[i].type == DS_TYPE_GAUGE))
1081 vl->values[i].gauge = NAN;
1082 else if (0 != parse_value (ptr, &vl->values[i], ds->ds[i].type))
1087 } /* while (strtok_r) */
1089 if ((ptr != NULL) || (i != vl->values_len))
1092 } /* int parse_values */
1094 #if !HAVE_GETPWNAM_R
1095 int getpwnam_r (const char *name, struct passwd *pwbuf, char *buf,
1096 size_t buflen, struct passwd **pwbufp)
1101 memset (pwbuf, '\0', sizeof (struct passwd));
1103 pthread_mutex_lock (&getpwnam_r_lock);
1107 pw = getpwnam (name);
1110 status = (errno != 0) ? errno : ENOENT;
1114 #define GETPWNAM_COPY_MEMBER(member) \
1115 if (pw->member != NULL) \
1117 int len = strlen (pw->member); \
1118 if (len >= buflen) \
1123 sstrncpy (buf, pw->member, buflen); \
1124 pwbuf->member = buf; \
1126 buflen -= (len + 1); \
1128 GETPWNAM_COPY_MEMBER(pw_name);
1129 GETPWNAM_COPY_MEMBER(pw_passwd);
1130 GETPWNAM_COPY_MEMBER(pw_gecos);
1131 GETPWNAM_COPY_MEMBER(pw_dir);
1132 GETPWNAM_COPY_MEMBER(pw_shell);
1134 pwbuf->pw_uid = pw->pw_uid;
1135 pwbuf->pw_gid = pw->pw_gid;
1141 pthread_mutex_unlock (&getpwnam_r_lock);
1144 } /* int getpwnam_r */
1145 #endif /* !HAVE_GETPWNAM_R */
1147 int notification_init (notification_t *n, int severity, const char *message,
1149 const char *plugin, const char *plugin_instance,
1150 const char *type, const char *type_instance)
1152 memset (n, '\0', sizeof (notification_t));
1154 n->severity = severity;
1156 if (message != NULL)
1157 sstrncpy (n->message, message, sizeof (n->message));
1159 sstrncpy (n->host, host, sizeof (n->host));
1161 sstrncpy (n->plugin, plugin, sizeof (n->plugin));
1162 if (plugin_instance != NULL)
1163 sstrncpy (n->plugin_instance, plugin_instance,
1164 sizeof (n->plugin_instance));
1166 sstrncpy (n->type, type, sizeof (n->type));
1167 if (type_instance != NULL)
1168 sstrncpy (n->type_instance, type_instance,
1169 sizeof (n->type_instance));
1172 } /* int notification_init */
1174 int walk_directory (const char *dir, dirwalk_callback_f callback,
1175 void *user_data, int include_hidden)
1185 if ((dh = opendir (dir)) == NULL)
1188 ERROR ("walk_directory: Cannot open '%s': %s", dir,
1189 sstrerror (errno, errbuf, sizeof (errbuf)));
1193 while ((ent = readdir (dh)) != NULL)
1199 if ((strcmp (".", ent->d_name) == 0)
1200 || (strcmp ("..", ent->d_name) == 0))
1203 else /* if (!include_hidden) */
1205 if (ent->d_name[0]=='.')
1209 status = (*callback) (dir, ent->d_name, user_data);
1218 if ((success == 0) && (failure > 0))
1223 int read_file_contents (const char *filename, char *buf, int bufsize)
1228 if ((fh = fopen (filename, "r")) == NULL)
1231 n = fread(buf, 1, bufsize, fh);
1237 counter_t counter_diff (counter_t old_value, counter_t new_value)
1241 if (old_value > new_value)
1243 if (old_value <= 4294967295U)
1244 diff = (4294967295U - old_value) + new_value;
1246 diff = (18446744073709551615ULL - old_value)
1251 diff = new_value - old_value;
1255 } /* counter_t counter_diff */
1257 int rate_to_value (value_t *ret_value, gauge_t rate, /* {{{ */
1258 rate_to_value_state_t *state,
1259 int ds_type, cdtime_t t)
1261 gauge_t delta_gauge;
1264 if (ds_type == DS_TYPE_GAUGE)
1266 state->last_value.gauge = rate;
1267 state->last_time = t;
1269 *ret_value = state->last_value;
1273 /* Counter and absolute can't handle negative rates. Reset "last time"
1274 * to zero, so that the next valid rate will re-initialize the
1277 && ((ds_type == DS_TYPE_COUNTER)
1278 || (ds_type == DS_TYPE_ABSOLUTE)))
1280 memset (state, 0, sizeof (*state));
1284 /* Another invalid state: The time is not increasing. */
1285 if (t <= state->last_time)
1287 memset (state, 0, sizeof (*state));
1291 delta_t = t - state->last_time;
1292 delta_gauge = (rate * CDTIME_T_TO_DOUBLE (delta_t)) + state->residual;
1294 /* Previous value is invalid. */
1295 if (state->last_time == 0) /* {{{ */
1297 if (ds_type == DS_TYPE_DERIVE)
1299 state->last_value.derive = (derive_t) rate;
1300 state->residual = rate - ((gauge_t) state->last_value.derive);
1302 else if (ds_type == DS_TYPE_COUNTER)
1304 state->last_value.counter = (counter_t) rate;
1305 state->residual = rate - ((gauge_t) state->last_value.counter);
1307 else if (ds_type == DS_TYPE_ABSOLUTE)
1309 state->last_value.absolute = (absolute_t) rate;
1310 state->residual = rate - ((gauge_t) state->last_value.absolute);
1317 state->last_time = t;
1321 if (ds_type == DS_TYPE_DERIVE)
1323 derive_t delta_derive = (derive_t) delta_gauge;
1325 state->last_value.derive += delta_derive;
1326 state->residual = delta_gauge - ((gauge_t) delta_derive);
1328 else if (ds_type == DS_TYPE_COUNTER)
1330 counter_t delta_counter = (counter_t) delta_gauge;
1332 state->last_value.counter += delta_counter;
1333 state->residual = delta_gauge - ((gauge_t) delta_counter);
1335 else if (ds_type == DS_TYPE_ABSOLUTE)
1337 absolute_t delta_absolute = (absolute_t) delta_gauge;
1339 state->last_value.absolute = delta_absolute;
1340 state->residual = delta_gauge - ((gauge_t) delta_absolute);
1347 state->last_time = t;
1348 *ret_value = state->last_value;
1350 } /* }}} value_t rate_to_value */
1352 int service_name_to_port_number (const char *service_name)
1354 struct addrinfo *ai_list;
1355 struct addrinfo *ai_ptr;
1356 struct addrinfo ai_hints;
1360 if (service_name == NULL)
1364 memset (&ai_hints, 0, sizeof (ai_hints));
1365 ai_hints.ai_family = AF_UNSPEC;
1367 status = getaddrinfo (/* node = */ NULL, service_name,
1368 &ai_hints, &ai_list);
1371 ERROR ("service_name_to_port_number: getaddrinfo failed: %s",
1372 gai_strerror (status));
1376 service_number = -1;
1377 for (ai_ptr = ai_list; ai_ptr != NULL; ai_ptr = ai_ptr->ai_next)
1379 if (ai_ptr->ai_family == AF_INET)
1381 struct sockaddr_in *sa;
1383 sa = (void *) ai_ptr->ai_addr;
1384 service_number = (int) ntohs (sa->sin_port);
1386 else if (ai_ptr->ai_family == AF_INET6)
1388 struct sockaddr_in6 *sa;
1390 sa = (void *) ai_ptr->ai_addr;
1391 service_number = (int) ntohs (sa->sin6_port);
1394 if ((service_number > 0) && (service_number <= 65535))
1398 freeaddrinfo (ai_list);
1400 if ((service_number > 0) && (service_number <= 65535))
1401 return (service_number);
1403 } /* int service_name_to_port_number */
1405 int strtoderive (const char *string, derive_t *ret_value) /* {{{ */
1410 if ((string == NULL) || (ret_value == NULL))
1415 tmp = (derive_t) strtoll (string, &endptr, /* base = */ 0);
1416 if ((endptr == string) || (errno != 0))
1421 } /* }}} int strtoderive */
1423 int strarray_add (char ***ret_array, size_t *ret_array_len, char const *str) /* {{{ */
1426 size_t array_len = *ret_array_len;
1431 array = realloc (*ret_array,
1432 (array_len + 1) * sizeof (*array));
1437 array[array_len] = strdup (str);
1438 if (array[array_len] == NULL)
1442 *ret_array_len = array_len;
1444 } /* }}} int strarray_add */
1446 void strarray_free (char **array, size_t array_len) /* {{{ */
1450 for (i = 0; i < array_len; i++)
1453 } /* }}} void strarray_free */