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// 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;
}
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