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-rw-r--r--collectors/proc.plugin/proc_uptime.c105
1 files changed, 105 insertions, 0 deletions
diff --git a/collectors/proc.plugin/proc_uptime.c b/collectors/proc.plugin/proc_uptime.c
new file mode 100644
index 0000000..142ae2d
--- /dev/null
+++ b/collectors/proc.plugin/proc_uptime.c
@@ -0,0 +1,105 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#include "plugin_proc.h"
+
+static inline collected_number uptime_from_boottime(void) {
+#ifdef CLOCK_BOOTTIME_IS_AVAILABLE
+ return now_boottime_usec() / 1000;
+#else
+ error("uptime cannot be read from CLOCK_BOOTTIME on this system.");
+ return 0;
+#endif
+}
+
+static procfile *read_proc_uptime_ff = NULL;
+static inline collected_number read_proc_uptime(void) {
+ if(unlikely(!read_proc_uptime_ff)) {
+ char filename[FILENAME_MAX + 1];
+ snprintfz(filename, FILENAME_MAX, "%s%s", netdata_configured_host_prefix, "/proc/uptime");
+
+ read_proc_uptime_ff = procfile_open(config_get("plugin:proc:/proc/uptime", "filename to monitor", filename), " \t", PROCFILE_FLAG_DEFAULT);
+ if(unlikely(!read_proc_uptime_ff)) return 0;
+ }
+
+ read_proc_uptime_ff = procfile_readall(read_proc_uptime_ff);
+ if(unlikely(!read_proc_uptime_ff)) return 0;
+
+ if(unlikely(procfile_lines(read_proc_uptime_ff) < 1)) {
+ error("/proc/uptime has no lines.");
+ return 0;
+ }
+ if(unlikely(procfile_linewords(read_proc_uptime_ff, 0) < 1)) {
+ error("/proc/uptime has less than 1 word in it.");
+ return 0;
+ }
+
+ return (collected_number)(strtold(procfile_lineword(read_proc_uptime_ff, 0, 0), NULL) * 1000.0);
+}
+
+int do_proc_uptime(int update_every, usec_t dt) {
+ (void)dt;
+
+ static int use_boottime = -1;
+
+ if(unlikely(use_boottime == -1)) {
+ collected_number uptime_boottime = uptime_from_boottime();
+ collected_number uptime_proc = read_proc_uptime();
+
+ long long delta = (long long)uptime_boottime - (long long)uptime_proc;
+ if(delta < 0) delta = -delta;
+
+ if(delta <= 1000 && uptime_boottime != 0) {
+ procfile_close(read_proc_uptime_ff);
+ info("Using now_boottime_usec() for uptime (dt is %lld ms)", delta);
+ use_boottime = 1;
+ }
+ else if(uptime_proc != 0) {
+ info("Using /proc/uptime for uptime (dt is %lld ms)", delta);
+ use_boottime = 0;
+ }
+ else {
+ error("Cannot find any way to read uptime on this system.");
+ return 1;
+ }
+ }
+
+ collected_number uptime;
+ if(use_boottime)
+ uptime = uptime_from_boottime();
+ else
+ uptime = read_proc_uptime();
+
+
+ // --------------------------------------------------------------------
+
+ static RRDSET *st = NULL;
+ static RRDDIM *rd = NULL;
+
+ if(unlikely(!st)) {
+
+ st = rrdset_create_localhost(
+ "system"
+ , "uptime"
+ , NULL
+ , "uptime"
+ , NULL
+ , "System Uptime"
+ , "seconds"
+ , PLUGIN_PROC_NAME
+ , "/proc/uptime"
+ , NETDATA_CHART_PRIO_SYSTEM_UPTIME
+ , update_every
+ , RRDSET_TYPE_LINE
+ );
+
+ rd = rrddim_add(st, "uptime", NULL, 1, 1000, RRD_ALGORITHM_ABSOLUTE);
+ }
+ else
+ rrdset_next(st);
+
+ rrddim_set_by_pointer(st, rd, uptime);
+
+ rrdset_done(st);
+
+ return 0;
+}