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>
50 # include <netinet/in.h>
53 /* for ntohl and htonl */
55 # include <arpa/inet.h>
59 extern kstat_ctl_t *kc;
63 static pthread_mutex_t getpwnam_r_lock = PTHREAD_MUTEX_INITIALIZER;
67 static pthread_mutex_t strerror_r_lock = PTHREAD_MUTEX_INITIALIZER;
70 char *sstrncpy (char *dest, const char *src, size_t n)
72 strncpy (dest, src, n);
76 } /* char *sstrncpy */
78 int ssnprintf (char *dest, size_t n, const char *format, ...)
83 va_start (ap, format);
84 ret = vsnprintf (dest, n, format, ap);
91 char *ssnprintf_alloc (char const *format, ...) /* {{{ */
93 char static_buffer[1024] = "";
95 size_t alloc_buffer_size;
99 /* Try printing into the static buffer. In many cases it will be
100 * sufficiently large and we can simply return a strdup() of this
102 va_start (ap, format);
103 status = vsnprintf (static_buffer, sizeof (static_buffer), format, ap);
108 /* "status" does not include the null byte. */
109 alloc_buffer_size = (size_t) (status + 1);
110 if (alloc_buffer_size <= sizeof (static_buffer))
111 return (strdup (static_buffer));
113 /* Allocate a buffer large enough to hold the string. */
114 alloc_buffer = malloc (alloc_buffer_size);
115 if (alloc_buffer == NULL)
117 memset (alloc_buffer, 0, alloc_buffer_size);
119 /* Print again into this new buffer. */
120 va_start (ap, format);
121 status = vsnprintf (alloc_buffer, alloc_buffer_size, format, ap);
125 sfree (alloc_buffer);
129 return (alloc_buffer);
130 } /* }}} char *ssnprintf_alloc */
132 char *sstrdup (const char *s)
140 /* Do not use `strdup' here, because it's not specified in POSIX. It's
141 * ``only'' an XSI extension. */
143 r = (char *) malloc (sizeof (char) * sz);
146 ERROR ("sstrdup: Out of memory.");
149 memcpy (r, s, sizeof (char) * sz);
152 } /* char *sstrdup */
154 /* Even though Posix requires "strerror_r" to return an "int",
155 * some systems (e.g. the GNU libc) return a "char *" _and_
156 * ignore the second argument ... -tokkee */
157 char *sstrerror (int errnum, char *buf, size_t buflen)
165 pthread_mutex_lock (&strerror_r_lock);
167 temp = strerror (errnum);
168 sstrncpy (buf, temp, buflen);
170 pthread_mutex_unlock (&strerror_r_lock);
172 /* #endif !HAVE_STRERROR_R */
174 #elif STRERROR_R_CHAR_P
177 temp = strerror_r (errnum, buf, buflen);
180 if ((temp != NULL) && (temp != buf) && (temp[0] != '\0'))
181 sstrncpy (buf, temp, buflen);
183 sstrncpy (buf, "strerror_r did not return "
184 "an error message", buflen);
187 /* #endif STRERROR_R_CHAR_P */
190 if (strerror_r (errnum, buf, buflen) != 0)
192 ssnprintf (buf, buflen, "Error #%i; "
193 "Additionally, strerror_r failed.",
196 #endif /* STRERROR_R_CHAR_P */
199 } /* char *sstrerror */
201 void *smalloc (size_t size)
205 if ((r = malloc (size)) == NULL)
207 ERROR ("Not enough memory.");
212 } /* void *smalloc */
215 void sfree (void **ptr)
227 ssize_t sread (int fd, void *buf, size_t count)
238 status = read (fd, (void *) ptr, nleft);
240 if ((status < 0) && ((errno == EAGAIN) || (errno == EINTR)))
248 DEBUG ("Received EOF from fd %i. "
249 "Closing fd and returning error.",
255 assert ((0 > status) || (nleft >= (size_t)status));
257 nleft = nleft - status;
265 ssize_t swrite (int fd, const void *buf, size_t count)
272 ptr = (const char *) buf;
275 /* checking for closed peer connection */
277 pfd.events = POLLIN | POLLHUP;
279 if (poll(&pfd, 1, 0) > 0) {
281 if (recv(fd, buffer, sizeof(buffer), MSG_PEEK | MSG_DONTWAIT) == 0) {
282 // if recv returns zero (even though poll() said there is data to be read),
283 // that means the connection has been closed
290 status = write (fd, (const void *) ptr, nleft);
292 if ((status < 0) && ((errno == EAGAIN) || (errno == EINTR)))
298 nleft = nleft - status;
305 int strsplit (char *string, char **fields, size_t size)
314 while ((fields[i] = strtok_r (ptr, " \t\r\n", &saveptr)) != NULL)
326 int strjoin (char *buffer, size_t buffer_size,
327 char **fields, size_t fields_num,
335 if ((buffer_size < 1) || (fields_num <= 0))
338 memset (buffer, 0, buffer_size);
340 avail = buffer_size - 1;
344 sep_len = strlen (sep);
346 for (i = 0; i < fields_num; i++)
350 if ((i > 0) && (sep_len > 0))
355 memcpy (ptr, sep, sep_len);
360 field_len = strlen (fields[i]);
361 if (avail < field_len)
364 memcpy (ptr, fields[i], field_len);
369 assert (buffer[buffer_size - 1] == 0);
370 return (strlen (buffer));
373 int strsubstitute (char *str, char c_from, char c_to)
392 } /* int strsubstitute */
394 int strunescape (char *buf, size_t buf_len)
398 for (i = 0; (i < buf_len) && (buf[i] != '\0'); ++i)
403 if ((i >= buf_len) || (buf[i + 1] == '\0')) {
404 ERROR ("string unescape: backslash found at end of string.");
408 switch (buf[i + 1]) {
423 memmove (buf + i + 1, buf + i + 2, buf_len - i - 2);
426 } /* int strunescape */
428 size_t strstripnewline (char *buffer)
430 size_t buffer_len = strlen (buffer);
432 while (buffer_len > 0)
434 if ((buffer[buffer_len - 1] != '\n')
435 && (buffer[buffer_len - 1] != '\r'))
438 buffer[buffer_len] = 0;
442 } /* size_t strstripnewline */
444 int escape_slashes (char *buf, int buf_len)
448 if (strcmp (buf, "/") == 0)
453 strncpy (buf, "root", buf_len);
460 /* Move one to the left */
462 memmove (buf, buf + 1, buf_len - 1);
464 for (i = 0; i < buf_len; i++)
468 else if (buf[i] == '/')
474 } /* int escape_slashes */
476 void replace_special (char *buffer, size_t buffer_size)
480 for (i = 0; i < buffer_size; i++)
484 if ((!isalnum ((int) buffer[i])) && (buffer[i] != '-'))
487 } /* void replace_special */
489 int timeval_cmp (struct timeval tv0, struct timeval tv1, struct timeval *delta)
491 struct timeval *larger;
492 struct timeval *smaller;
496 NORMALIZE_TIMEVAL (tv0);
497 NORMALIZE_TIMEVAL (tv1);
499 if ((tv0.tv_sec == tv1.tv_sec) && (tv0.tv_usec == tv1.tv_usec))
508 if ((tv0.tv_sec < tv1.tv_sec)
509 || ((tv0.tv_sec == tv1.tv_sec) && (tv0.tv_usec < tv1.tv_usec)))
523 delta->tv_sec = larger->tv_sec - smaller->tv_sec;
525 if (smaller->tv_usec <= larger->tv_usec)
526 delta->tv_usec = larger->tv_usec - smaller->tv_usec;
530 delta->tv_usec = 1000000 + larger->tv_usec - smaller->tv_usec;
534 assert ((delta == NULL)
535 || ((0 <= delta->tv_usec) && (delta->tv_usec < 1000000)));
538 } /* int timeval_cmp */
540 int check_create_dir (const char *file_orig)
551 int last_is_file = 1;
552 int path_is_absolute = 0;
557 * Sanity checks first
559 if (file_orig == NULL)
562 if ((len = strlen (file_orig)) < 1)
564 else if (len >= sizeof (file_copy))
568 * If `file_orig' ends in a slash the last component is a directory,
569 * otherwise it's a file. Act accordingly..
571 if (file_orig[len - 1] == '/')
573 if (file_orig[0] == '/')
574 path_is_absolute = 1;
577 * Create a copy for `strtok_r' to destroy
579 sstrncpy (file_copy, file_orig, sizeof (file_copy));
582 * Break into components. This will eat up several slashes in a row and
583 * remove leading and trailing slashes..
588 while ((fields[fields_num] = strtok_r (ptr, "/", &saveptr)) != NULL)
593 if (fields_num >= 16)
598 * For each component, do..
600 for (i = 0; i < (fields_num - last_is_file); i++)
603 * Do not create directories that start with a dot. This
604 * prevents `../../' attacks and other likely malicious
607 if (fields[i][0] == '.')
609 ERROR ("Cowardly refusing to create a directory that "
610 "begins with a `.' (dot): `%s'", file_orig);
615 * Join the components together again
618 if (strjoin (dir + path_is_absolute, dir_len - path_is_absolute,
619 fields, i + 1, "/") < 0)
621 ERROR ("strjoin failed: `%s', component #%i", file_orig, i);
626 if ((stat (dir, &statbuf) == -1)
627 && (lstat (dir, &statbuf) == -1))
631 if (mkdir (dir, S_IRWXU | S_IRWXG | S_IRWXO) == 0)
634 /* this might happen, if a different thread created
635 * the directory in the meantime
636 * => call stat() again to check for S_ISDIR() */
641 ERROR ("check_create_dir: mkdir (%s): %s", dir,
643 errbuf, sizeof (errbuf)));
649 ERROR ("check_create_dir: stat (%s): %s", dir,
650 sstrerror (errno, errbuf,
655 else if (!S_ISDIR (statbuf.st_mode))
657 ERROR ("check_create_dir: `%s' exists but is not "
658 "a directory!", dir);
666 } /* check_create_dir */
669 int get_kstat (kstat_t **ksp_ptr, char *module, int instance, char *name)
678 ssnprintf (ident, sizeof (ident), "%s,%i,%s", module, instance, name);
680 *ksp_ptr = kstat_lookup (kc, module, instance, name);
681 if (*ksp_ptr == NULL)
683 ERROR ("get_kstat: Cound not find kstat %s", ident);
687 if ((*ksp_ptr)->ks_type != KSTAT_TYPE_NAMED)
689 ERROR ("get_kstat: kstat %s has wrong type", ident);
695 assert (*ksp_ptr != NULL);
696 assert ((*ksp_ptr)->ks_type == KSTAT_TYPE_NAMED);
699 if (kstat_read (kc, *ksp_ptr, NULL) == -1)
701 ERROR ("get_kstat: kstat %s could not be read", ident);
705 if ((*ksp_ptr)->ks_type != KSTAT_TYPE_NAMED)
707 ERROR ("get_kstat: kstat %s has wrong type", ident);
714 long long get_kstat_value (kstat_t *ksp, char *name)
717 long long retval = -1LL;
721 ERROR ("get_kstat_value (\"%s\"): ksp is NULL.", name);
724 else if (ksp->ks_type != KSTAT_TYPE_NAMED)
726 ERROR ("get_kstat_value (\"%s\"): ksp->ks_type (%#x) "
727 "is not KSTAT_TYPE_NAMED (%#x).",
729 (unsigned int) ksp->ks_type,
730 (unsigned int) KSTAT_TYPE_NAMED);
734 if ((kn = (kstat_named_t *) kstat_data_lookup (ksp, name)) == NULL)
737 if (kn->data_type == KSTAT_DATA_INT32)
738 retval = (long long) kn->value.i32;
739 else if (kn->data_type == KSTAT_DATA_UINT32)
740 retval = (long long) kn->value.ui32;
741 else if (kn->data_type == KSTAT_DATA_INT64)
742 retval = (long long) kn->value.i64; /* According to ANSI C99 `long long' must hold at least 64 bits */
743 else if (kn->data_type == KSTAT_DATA_UINT64)
744 retval = (long long) kn->value.ui64; /* XXX: Might overflow! */
746 WARNING ("get_kstat_value: Not a numeric value: %s", name);
750 #endif /* HAVE_LIBKSTAT */
753 unsigned long long ntohll (unsigned long long n)
755 #if BYTE_ORDER == BIG_ENDIAN
758 return (((unsigned long long) ntohl (n)) << 32) + ntohl (n >> 32);
760 } /* unsigned long long ntohll */
762 unsigned long long htonll (unsigned long long n)
764 #if BYTE_ORDER == BIG_ENDIAN
767 return (((unsigned long long) htonl (n)) << 32) + htonl (n >> 32);
769 } /* unsigned long long htonll */
770 #endif /* HAVE_HTONLL */
772 #if FP_LAYOUT_NEED_NOTHING
773 /* Well, we need nothing.. */
774 /* #endif FP_LAYOUT_NEED_NOTHING */
776 #elif FP_LAYOUT_NEED_ENDIANFLIP || FP_LAYOUT_NEED_INTSWAP
777 # if FP_LAYOUT_NEED_ENDIANFLIP
778 # define FP_CONVERT(A) ((((uint64_t)(A) & 0xff00000000000000LL) >> 56) | \
779 (((uint64_t)(A) & 0x00ff000000000000LL) >> 40) | \
780 (((uint64_t)(A) & 0x0000ff0000000000LL) >> 24) | \
781 (((uint64_t)(A) & 0x000000ff00000000LL) >> 8) | \
782 (((uint64_t)(A) & 0x00000000ff000000LL) << 8) | \
783 (((uint64_t)(A) & 0x0000000000ff0000LL) << 24) | \
784 (((uint64_t)(A) & 0x000000000000ff00LL) << 40) | \
785 (((uint64_t)(A) & 0x00000000000000ffLL) << 56))
787 # define FP_CONVERT(A) ((((uint64_t)(A) & 0xffffffff00000000LL) >> 32) | \
788 (((uint64_t)(A) & 0x00000000ffffffffLL) << 32))
791 double ntohd (double d)
802 /* NAN in x86 byte order */
803 if ((ret.byte[0] == 0x00) && (ret.byte[1] == 0x00)
804 && (ret.byte[2] == 0x00) && (ret.byte[3] == 0x00)
805 && (ret.byte[4] == 0x00) && (ret.byte[5] == 0x00)
806 && (ret.byte[6] == 0xf8) && (ret.byte[7] == 0x7f))
815 ret.integer = FP_CONVERT (tmp);
816 return (ret.floating);
820 double htond (double d)
831 ret.byte[0] = ret.byte[1] = ret.byte[2] = ret.byte[3] = 0x00;
832 ret.byte[4] = ret.byte[5] = 0x00;
835 return (ret.floating);
842 tmp = FP_CONVERT (ret.integer);
844 return (ret.floating);
847 #endif /* FP_LAYOUT_NEED_ENDIANFLIP || FP_LAYOUT_NEED_INTSWAP */
849 int format_name (char *ret, int ret_len,
850 const char *hostname,
851 const char *plugin, const char *plugin_instance,
852 const char *type, const char *type_instance)
858 buffer_size = (size_t) ret_len;
860 #define APPEND(str) do { \
861 size_t l = strlen (str); \
862 if (l >= buffer_size) \
864 memcpy (buffer, (str), l); \
865 buffer += l; buffer_size -= l; \
868 assert (plugin != NULL);
869 assert (type != NULL);
874 if ((plugin_instance != NULL) && (plugin_instance[0] != 0))
877 APPEND (plugin_instance);
881 if ((type_instance != NULL) && (type_instance[0] != 0))
884 APPEND (type_instance);
886 assert (buffer_size > 0);
891 } /* int format_name */
893 int format_values (char *ret, size_t ret_len, /* {{{ */
894 const data_set_t *ds, const value_list_t *vl,
900 gauge_t *rates = NULL;
902 assert (0 == strcmp (ds->type, vl->type));
904 memset (ret, 0, ret_len);
906 #define BUFFER_ADD(...) do { \
907 status = ssnprintf (ret + offset, ret_len - offset, \
914 else if (((size_t) status) >= (ret_len - offset)) \
920 offset += ((size_t) status); \
923 BUFFER_ADD ("%.3f", CDTIME_T_TO_DOUBLE (vl->time));
925 for (i = 0; i < ds->ds_num; i++)
927 if (ds->ds[i].type == DS_TYPE_GAUGE)
928 BUFFER_ADD (":"GAUGE_FORMAT, vl->values[i].gauge);
929 else if (store_rates)
932 rates = uc_get_rate (ds, vl);
935 WARNING ("format_values: uc_get_rate failed.");
938 BUFFER_ADD (":"GAUGE_FORMAT, rates[i]);
940 else if (ds->ds[i].type == DS_TYPE_COUNTER)
941 BUFFER_ADD (":%llu", vl->values[i].counter);
942 else if (ds->ds[i].type == DS_TYPE_DERIVE)
943 BUFFER_ADD (":%"PRIi64, vl->values[i].derive);
944 else if (ds->ds[i].type == DS_TYPE_ABSOLUTE)
945 BUFFER_ADD (":%"PRIu64, vl->values[i].absolute);
948 ERROR ("format_values: Unknown data source type: %i",
953 } /* for ds->ds_num */
959 } /* }}} int format_values */
961 int parse_identifier (char *str, char **ret_host,
962 char **ret_plugin, char **ret_plugin_instance,
963 char **ret_type, char **ret_type_instance)
965 char *hostname = NULL;
967 char *plugin_instance = NULL;
969 char *type_instance = NULL;
972 if (hostname == NULL)
975 plugin = strchr (hostname, '/');
978 *plugin = '\0'; plugin++;
980 type = strchr (plugin, '/');
983 *type = '\0'; type++;
985 plugin_instance = strchr (plugin, '-');
986 if (plugin_instance != NULL)
988 *plugin_instance = '\0';
992 type_instance = strchr (type, '-');
993 if (type_instance != NULL)
995 *type_instance = '\0';
999 *ret_host = hostname;
1000 *ret_plugin = plugin;
1001 *ret_plugin_instance = plugin_instance;
1003 *ret_type_instance = type_instance;
1005 } /* int parse_identifier */
1007 int parse_identifier_vl (const char *str, value_list_t *vl) /* {{{ */
1009 char str_copy[6 * DATA_MAX_NAME_LEN];
1011 char *plugin = NULL;
1012 char *plugin_instance = NULL;
1014 char *type_instance = NULL;
1017 if ((str == NULL) || (vl == NULL))
1020 sstrncpy (str_copy, str, sizeof (str_copy));
1022 status = parse_identifier (str_copy, &host,
1023 &plugin, &plugin_instance,
1024 &type, &type_instance);
1028 sstrncpy (vl->host, host, sizeof (vl->host));
1029 sstrncpy (vl->plugin, plugin, sizeof (vl->plugin));
1030 sstrncpy (vl->plugin_instance,
1031 (plugin_instance != NULL) ? plugin_instance : "",
1032 sizeof (vl->plugin_instance));
1033 sstrncpy (vl->type, type, sizeof (vl->type));
1034 sstrncpy (vl->type_instance,
1035 (type_instance != NULL) ? type_instance : "",
1036 sizeof (vl->type_instance));
1039 } /* }}} int parse_identifier_vl */
1041 int parse_value (const char *value_orig, value_t *ret_value, int ds_type)
1044 char *endptr = NULL;
1047 if (value_orig == NULL)
1050 value = strdup (value_orig);
1053 value_len = strlen (value);
1055 while ((value_len > 0) && isspace ((int) value[value_len - 1]))
1057 value[value_len - 1] = 0;
1063 case DS_TYPE_COUNTER:
1064 ret_value->counter = (counter_t) strtoull (value, &endptr, 0);
1068 ret_value->gauge = (gauge_t) strtod (value, &endptr);
1071 case DS_TYPE_DERIVE:
1072 ret_value->derive = (derive_t) strtoll (value, &endptr, 0);
1075 case DS_TYPE_ABSOLUTE:
1076 ret_value->absolute = (absolute_t) strtoull (value, &endptr, 0);
1081 ERROR ("parse_value: Invalid data source type: %i.", ds_type);
1085 if (value == endptr) {
1086 ERROR ("parse_value: Failed to parse string as %s: %s.",
1087 DS_TYPE_TO_STRING (ds_type), value);
1091 else if ((NULL != endptr) && ('\0' != *endptr))
1092 INFO ("parse_value: Ignoring trailing garbage \"%s\" after %s value. "
1093 "Input string was \"%s\".",
1094 endptr, DS_TYPE_TO_STRING (ds_type), value_orig);
1098 } /* int parse_value */
1100 int parse_values (char *buffer, value_list_t *vl, const data_set_t *ds)
1107 if ((buffer == NULL) || (vl == NULL) || (ds == NULL))
1113 while ((ptr = strtok_r (dummy, ":", &saveptr)) != NULL)
1117 if (i >= vl->values_len)
1119 /* Make sure i is invalid. */
1120 i = vl->values_len + 1;
1126 if (strcmp ("N", ptr) == 0)
1127 vl->time = cdtime ();
1130 char *endptr = NULL;
1134 tmp = strtod (ptr, &endptr);
1135 if ((errno != 0) /* Overflow */
1136 || (endptr == ptr) /* Invalid string */
1137 || (endptr == NULL) /* This should not happen */
1138 || (*endptr != 0)) /* Trailing chars */
1141 vl->time = DOUBLE_TO_CDTIME_T (tmp);
1146 if ((strcmp ("U", ptr) == 0) && (ds->ds[i].type == DS_TYPE_GAUGE))
1147 vl->values[i].gauge = NAN;
1148 else if (0 != parse_value (ptr, &vl->values[i], ds->ds[i].type))
1153 } /* while (strtok_r) */
1155 if ((ptr != NULL) || (i != vl->values_len))
1158 } /* int parse_values */
1160 #if !HAVE_GETPWNAM_R
1161 int getpwnam_r (const char *name, struct passwd *pwbuf, char *buf,
1162 size_t buflen, struct passwd **pwbufp)
1167 memset (pwbuf, '\0', sizeof (struct passwd));
1169 pthread_mutex_lock (&getpwnam_r_lock);
1173 pw = getpwnam (name);
1176 status = (errno != 0) ? errno : ENOENT;
1180 #define GETPWNAM_COPY_MEMBER(member) \
1181 if (pw->member != NULL) \
1183 int len = strlen (pw->member); \
1184 if (len >= buflen) \
1189 sstrncpy (buf, pw->member, buflen); \
1190 pwbuf->member = buf; \
1192 buflen -= (len + 1); \
1194 GETPWNAM_COPY_MEMBER(pw_name);
1195 GETPWNAM_COPY_MEMBER(pw_passwd);
1196 GETPWNAM_COPY_MEMBER(pw_gecos);
1197 GETPWNAM_COPY_MEMBER(pw_dir);
1198 GETPWNAM_COPY_MEMBER(pw_shell);
1200 pwbuf->pw_uid = pw->pw_uid;
1201 pwbuf->pw_gid = pw->pw_gid;
1207 pthread_mutex_unlock (&getpwnam_r_lock);
1210 } /* int getpwnam_r */
1211 #endif /* !HAVE_GETPWNAM_R */
1213 int notification_init (notification_t *n, int severity, const char *message,
1215 const char *plugin, const char *plugin_instance,
1216 const char *type, const char *type_instance)
1218 memset (n, '\0', sizeof (notification_t));
1220 n->severity = severity;
1222 if (message != NULL)
1223 sstrncpy (n->message, message, sizeof (n->message));
1225 sstrncpy (n->host, host, sizeof (n->host));
1227 sstrncpy (n->plugin, plugin, sizeof (n->plugin));
1228 if (plugin_instance != NULL)
1229 sstrncpy (n->plugin_instance, plugin_instance,
1230 sizeof (n->plugin_instance));
1232 sstrncpy (n->type, type, sizeof (n->type));
1233 if (type_instance != NULL)
1234 sstrncpy (n->type_instance, type_instance,
1235 sizeof (n->type_instance));
1238 } /* int notification_init */
1240 int walk_directory (const char *dir, dirwalk_callback_f callback,
1241 void *user_data, int include_hidden)
1251 if ((dh = opendir (dir)) == NULL)
1254 ERROR ("walk_directory: Cannot open '%s': %s", dir,
1255 sstrerror (errno, errbuf, sizeof (errbuf)));
1259 while ((ent = readdir (dh)) != NULL)
1265 if ((strcmp (".", ent->d_name) == 0)
1266 || (strcmp ("..", ent->d_name) == 0))
1269 else /* if (!include_hidden) */
1271 if (ent->d_name[0]=='.')
1275 status = (*callback) (dir, ent->d_name, user_data);
1284 if ((success == 0) && (failure > 0))
1289 ssize_t read_file_contents (const char *filename, char *buf, size_t bufsize)
1294 fh = fopen (filename, "r");
1298 ret = (ssize_t) fread (buf, 1, bufsize, fh);
1299 if ((ret == 0) && (ferror (fh) != 0))
1301 ERROR ("read_file_contents: Reading file \"%s\" failed.",
1310 counter_t counter_diff (counter_t old_value, counter_t new_value)
1314 if (old_value > new_value)
1316 if (old_value <= 4294967295U)
1317 diff = (4294967295U - old_value) + new_value;
1319 diff = (18446744073709551615ULL - old_value)
1324 diff = new_value - old_value;
1328 } /* counter_t counter_diff */
1330 int rate_to_value (value_t *ret_value, gauge_t rate, /* {{{ */
1331 rate_to_value_state_t *state,
1332 int ds_type, cdtime_t t)
1334 gauge_t delta_gauge;
1337 if (ds_type == DS_TYPE_GAUGE)
1339 state->last_value.gauge = rate;
1340 state->last_time = t;
1342 *ret_value = state->last_value;
1346 /* Counter and absolute can't handle negative rates. Reset "last time"
1347 * to zero, so that the next valid rate will re-initialize the
1350 && ((ds_type == DS_TYPE_COUNTER)
1351 || (ds_type == DS_TYPE_ABSOLUTE)))
1353 memset (state, 0, sizeof (*state));
1357 /* Another invalid state: The time is not increasing. */
1358 if (t <= state->last_time)
1360 memset (state, 0, sizeof (*state));
1364 delta_t = t - state->last_time;
1365 delta_gauge = (rate * CDTIME_T_TO_DOUBLE (delta_t)) + state->residual;
1367 /* Previous value is invalid. */
1368 if (state->last_time == 0) /* {{{ */
1370 if (ds_type == DS_TYPE_DERIVE)
1372 state->last_value.derive = (derive_t) rate;
1373 state->residual = rate - ((gauge_t) state->last_value.derive);
1375 else if (ds_type == DS_TYPE_COUNTER)
1377 state->last_value.counter = (counter_t) rate;
1378 state->residual = rate - ((gauge_t) state->last_value.counter);
1380 else if (ds_type == DS_TYPE_ABSOLUTE)
1382 state->last_value.absolute = (absolute_t) rate;
1383 state->residual = rate - ((gauge_t) state->last_value.absolute);
1390 state->last_time = t;
1394 if (ds_type == DS_TYPE_DERIVE)
1396 derive_t delta_derive = (derive_t) delta_gauge;
1398 state->last_value.derive += delta_derive;
1399 state->residual = delta_gauge - ((gauge_t) delta_derive);
1401 else if (ds_type == DS_TYPE_COUNTER)
1403 counter_t delta_counter = (counter_t) delta_gauge;
1405 state->last_value.counter += delta_counter;
1406 state->residual = delta_gauge - ((gauge_t) delta_counter);
1408 else if (ds_type == DS_TYPE_ABSOLUTE)
1410 absolute_t delta_absolute = (absolute_t) delta_gauge;
1412 state->last_value.absolute = delta_absolute;
1413 state->residual = delta_gauge - ((gauge_t) delta_absolute);
1420 state->last_time = t;
1421 *ret_value = state->last_value;
1423 } /* }}} value_t rate_to_value */
1425 int service_name_to_port_number (const char *service_name)
1427 struct addrinfo *ai_list;
1428 struct addrinfo *ai_ptr;
1429 struct addrinfo ai_hints;
1433 if (service_name == NULL)
1437 memset (&ai_hints, 0, sizeof (ai_hints));
1438 ai_hints.ai_family = AF_UNSPEC;
1440 status = getaddrinfo (/* node = */ NULL, service_name,
1441 &ai_hints, &ai_list);
1444 ERROR ("service_name_to_port_number: getaddrinfo failed: %s",
1445 gai_strerror (status));
1449 service_number = -1;
1450 for (ai_ptr = ai_list; ai_ptr != NULL; ai_ptr = ai_ptr->ai_next)
1452 if (ai_ptr->ai_family == AF_INET)
1454 struct sockaddr_in *sa;
1456 sa = (void *) ai_ptr->ai_addr;
1457 service_number = (int) ntohs (sa->sin_port);
1459 else if (ai_ptr->ai_family == AF_INET6)
1461 struct sockaddr_in6 *sa;
1463 sa = (void *) ai_ptr->ai_addr;
1464 service_number = (int) ntohs (sa->sin6_port);
1467 if ((service_number > 0) && (service_number <= 65535))
1471 freeaddrinfo (ai_list);
1473 if ((service_number > 0) && (service_number <= 65535))
1474 return (service_number);
1476 } /* int service_name_to_port_number */
1478 int strtoderive (const char *string, derive_t *ret_value) /* {{{ */
1483 if ((string == NULL) || (ret_value == NULL))
1488 tmp = (derive_t) strtoll (string, &endptr, /* base = */ 0);
1489 if ((endptr == string) || (errno != 0))
1494 } /* }}} int strtoderive */
1496 int strarray_add (char ***ret_array, size_t *ret_array_len, char const *str) /* {{{ */
1499 size_t array_len = *ret_array_len;
1504 array = realloc (*ret_array,
1505 (array_len + 1) * sizeof (*array));
1510 array[array_len] = strdup (str);
1511 if (array[array_len] == NULL)
1515 *ret_array_len = array_len;
1517 } /* }}} int strarray_add */
1519 void strarray_free (char **array, size_t array_len) /* {{{ */
1523 for (i = 0; i < array_len; i++)
1526 } /* }}} void strarray_free */