proc_uptime.c 3.0 KB

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  1. // SPDX-License-Identifier: GPL-3.0-or-later
  2. #include "plugin_proc.h"
  3. static inline collected_number uptime_from_boottime(void) {
  4. #ifdef CLOCK_BOOTTIME_IS_AVAILABLE
  5. return now_boottime_usec() / 1000;
  6. #else
  7. error("uptime cannot be read from CLOCK_BOOTTIME on this system.");
  8. return 0;
  9. #endif
  10. }
  11. static procfile *read_proc_uptime_ff = NULL;
  12. static inline collected_number read_proc_uptime(void) {
  13. if(unlikely(!read_proc_uptime_ff)) {
  14. char filename[FILENAME_MAX + 1];
  15. snprintfz(filename, FILENAME_MAX, "%s%s", netdata_configured_host_prefix, "/proc/uptime");
  16. read_proc_uptime_ff = procfile_open(config_get("plugin:proc:/proc/uptime", "filename to monitor", filename), " \t", PROCFILE_FLAG_DEFAULT);
  17. if(unlikely(!read_proc_uptime_ff)) return 0;
  18. }
  19. read_proc_uptime_ff = procfile_readall(read_proc_uptime_ff);
  20. if(unlikely(!read_proc_uptime_ff)) return 0;
  21. if(unlikely(procfile_lines(read_proc_uptime_ff) < 1)) {
  22. error("/proc/uptime has no lines.");
  23. return 0;
  24. }
  25. if(unlikely(procfile_linewords(read_proc_uptime_ff, 0) < 1)) {
  26. error("/proc/uptime has less than 1 word in it.");
  27. return 0;
  28. }
  29. return (collected_number)(strtold(procfile_lineword(read_proc_uptime_ff, 0, 0), NULL) * 1000.0);
  30. }
  31. int do_proc_uptime(int update_every, usec_t dt) {
  32. (void)dt;
  33. static int use_boottime = -1;
  34. if(unlikely(use_boottime == -1)) {
  35. collected_number uptime_boottime = uptime_from_boottime();
  36. collected_number uptime_proc = read_proc_uptime();
  37. long long delta = (long long)uptime_boottime - (long long)uptime_proc;
  38. if(delta < 0) delta = -delta;
  39. if(delta <= 1000 && uptime_boottime != 0) {
  40. procfile_close(read_proc_uptime_ff);
  41. info("Using now_boottime_usec() for uptime (dt is %lld ms)", delta);
  42. use_boottime = 1;
  43. }
  44. else if(uptime_proc != 0) {
  45. info("Using /proc/uptime for uptime (dt is %lld ms)", delta);
  46. use_boottime = 0;
  47. }
  48. else {
  49. error("Cannot find any way to read uptime on this system.");
  50. return 1;
  51. }
  52. }
  53. collected_number uptime;
  54. if(use_boottime)
  55. uptime = uptime_from_boottime();
  56. else
  57. uptime = read_proc_uptime();
  58. // --------------------------------------------------------------------
  59. static RRDSET *st = NULL;
  60. static RRDDIM *rd = NULL;
  61. if(unlikely(!st)) {
  62. st = rrdset_create_localhost(
  63. "system"
  64. , "uptime"
  65. , NULL
  66. , "uptime"
  67. , NULL
  68. , "System Uptime"
  69. , "seconds"
  70. , PLUGIN_PROC_NAME
  71. , "/proc/uptime"
  72. , NETDATA_CHART_PRIO_SYSTEM_UPTIME
  73. , update_every
  74. , RRDSET_TYPE_LINE
  75. );
  76. rd = rrddim_add(st, "uptime", NULL, 1, 1000, RRD_ALGORITHM_ABSOLUTE);
  77. }
  78. else
  79. rrdset_next(st);
  80. rrddim_set_by_pointer(st, rd, uptime);
  81. rrdset_done(st);
  82. return 0;
  83. }