src/utils_cmd_listval.c

   1 /**
   2  * collectd - src/utils_cmd_listval.c
   3  * Copyright (C) 2008       Florian octo Forster
   4  *
   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:
  11  *
  12  * The above copyright notice and this permission notice shall be included in
  13  * all copies or substantial portions of the Software.
  14  *
  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.
  22  *
  23  * Authors:
  24  *   Florian octo Forster <octo at collectd.org>
  25  **/
  26
  27 #include "collectd.h"
  28
  29 #include "common.h"
  30 #include "plugin.h"
  31
  32 #include "utils_cache.h"
  33 #include "utils_cmd_listval.h"
  34 #include "utils_parse_option.h"
  35
  36 cmd_status_t cmd_parse_listval(size_t argc, char **argv,
  37                                cmd_listval_t *ret_listval
  38                                __attribute__((unused)),
  39                                const cmd_options_t *opts
  40                                __attribute__((unused)),
  41                                cmd_error_handler_t *err) {
  42   if (argc != 0) {
  43     cmd_error(CMD_PARSE_ERROR, err, "Garbage after end of command: `%s'.",
  44               argv[0]);
  45     return CMD_PARSE_ERROR;
  46   }
  47
  48   return CMD_OK;
  49 } /* cmd_status_t cmd_parse_listval */
  50
  51 #define free_everything_and_return(status)                                     \
  52   do {                                                                         \
  53     for (size_t j = 0; j < number; j++) {                                      \
  54       sfree(names[j]);                                                         \
  55       names[j] = NULL;                                                         \
  56     }                                                                          \
  57     sfree(names);                                                              \
  58     sfree(times);                                                              \
  59     return status;                                                             \
  60   } while (0)
  61
  62 #define print_to_socket(fh, ...)                                               \
  63   do {                                                                         \
  64     if (fprintf(fh, __VA_ARGS__) < 0) {                                        \
  65       WARNING("handle_listval: failed to write to socket #%i: %s", fileno(fh), \
  66               STRERRNO);                                                       \
  67       free_everything_and_return(CMD_ERROR);                                   \
  68     }                                                                          \
  69     fflush(fh);                                                                \
  70   } while (0)
  71
  72 cmd_status_t cmd_handle_listval(FILE *fh, char *buffer) {
  73   cmd_error_handler_t err = {cmd_error_fh, fh};
  74   cmd_status_t status;
  75   cmd_t cmd;
  76
  77   char **names = NULL;
  78   cdtime_t *times = NULL;
  79   size_t number = 0;
  80
  81   DEBUG("utils_cmd_listval: handle_listval (fh = %p, buffer = %s);", (void *)fh,
  82         buffer);
  83
  84   if ((status = cmd_parse(buffer, &cmd, NULL, &err)) != CMD_OK)
  85     return status;
  86   if (cmd.type != CMD_LISTVAL) {
  87     cmd_error(CMD_UNKNOWN_COMMAND, &err, "Unexpected command: `%s'.",
  88               CMD_TO_STRING(cmd.type));
  89     free_everything_and_return(CMD_UNKNOWN_COMMAND);
  90   }
  91
  92   status = uc_get_names(&names, &times, &number);
  93   if (status != 0) {
  94     DEBUG("command listval: uc_get_names failed with status %i", status);
  95     cmd_error(CMD_ERROR, &err, "uc_get_names failed.");
  96     free_everything_and_return(CMD_ERROR);
  97   }
  98
  99   print_to_socket(fh, "%i Value%s found\n", (int)number,
 100                   (number == 1) ? "" : "s");
 101   for (size_t i = 0; i < number; i++)
 102     print_to_socket(fh, "%.3f %s\n", CDTIME_T_TO_DOUBLE(times[i]), names[i]);
 103
 104   free_everything_and_return(CMD_OK);
 105 } /* cmd_status_t cmd_handle_listval */
 106
 107 void cmd_destroy_listval(cmd_listval_t *listval __attribute__((unused))) {
 108   /* nothing to do */
 109 } /* void cmd_destroy_listval */