2 * collectd - src/uptime.c
3 * Copyright (C) 2009 Marco Chiappero
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 * Marco Chiappero <marco at absence.it>
28 #include <sys/sysinfo.h>
29 /* #endif KERNEL_LINUX */
32 /* Using kstats chain to retrieve the boot time on Solaris / OpenSolaris systems
34 /* #endif HAVE_LIBKSTAT */
36 #elif HAVE_SYS_SYSCTL_H
37 #include <sys/sysctl.h>
38 /* Using sysctl interface to retrieve the boot time on *BSD / Darwin / OS X
40 /* #endif HAVE_SYS_SYSCTL_H */
43 #include <libperfstat.h>
44 #include <sys/protosw.h>
45 /* Using perfstat_cpu_total to retrive the boot time in AIX */
46 /* #endif HAVE_PERFSTAT */
49 #error "No applicable input method."
61 extern kstat_ctl_t *kc;
62 #endif /* #endif HAVE_LIBKSTAT */
64 static void uptime_submit(gauge_t value) {
65 value_list_t vl = VALUE_LIST_INIT;
67 vl.values = &(value_t){.gauge = value};
70 sstrncpy(vl.plugin, "uptime", sizeof(vl.plugin));
71 sstrncpy(vl.type, "uptime", sizeof(vl.type));
73 plugin_dispatch_values(&vl);
77 * On most unix systems the uptime is calculated by looking at the boot
78 * time (stored in unix time, since epoch) and the current one. We are
79 * going to do the same, reading the boot time value while executing
80 * the uptime_init function (there is no need to read, every time the
81 * plugin_read is called, a value that won't change). However, since
82 * uptime_init is run only once, if the function fails in retrieving
83 * the boot time, the plugin is unregistered and there is no chance to
84 * try again later. Nevertheless, this is very unlikely to happen.
86 static time_t uptime_get_sys(void) { /* {{{ */
92 status = sysinfo(&info);
94 ERROR("uptime plugin: Error calling sysinfo: %s", STRERRNO);
98 result = (time_t)info.uptime;
99 /* #endif KERNEL_LINUX */
108 /* kstats chain already opened by update_kstat (using *kc), verify everything
111 ERROR("uptime plugin: kstat chain control structure not available.");
115 ksp = kstat_lookup(kc, "unix", 0, "system_misc");
117 ERROR("uptime plugin: Cannot find unix:0:system_misc kstat.");
121 if (kstat_read(kc, ksp, NULL) < 0) {
122 ERROR("uptime plugin: kstat_read failed.");
126 knp = (kstat_named_t *)kstat_data_lookup(ksp, "boot_time");
128 ERROR("uptime plugin: kstat_data_lookup (boot_time) failed.");
132 if (knp->value.ui32 == 0) {
133 ERROR("uptime plugin: kstat_data_lookup returned success, "
134 "but `boottime' is zero!");
138 result = time(NULL) - (time_t)knp->value.ui32;
139 /* #endif HAVE_LIBKSTAT */
141 #elif HAVE_SYS_SYSCTL_H
142 struct timeval boottv = {0};
146 int mib[] = {CTL_KERN, KERN_BOOTTIME};
148 boottv_len = sizeof(boottv);
150 status = sysctl(mib, STATIC_ARRAY_SIZE(mib), &boottv, &boottv_len,
151 /* new_value = */ NULL, /* new_length = */ 0);
153 ERROR("uptime plugin: No value read from sysctl interface: %s", STRERRNO);
157 if (boottv.tv_sec == 0) {
158 ERROR("uptime plugin: sysctl(3) returned success, "
159 "but `boottime' is zero!");
163 result = time(NULL) - boottv.tv_sec;
164 /* #endif HAVE_SYS_SYSCTL_H */
168 perfstat_cpu_total_t cputotal;
171 status = perfstat_cpu_total(NULL, &cputotal, sizeof(perfstat_cpu_total_t), 1);
173 ERROR("uptime plugin: perfstat_cpu_total: %s", STRERRNO);
177 hertz = sysconf(_SC_CLK_TCK);
181 result = cputotal.lbolt / hertz;
182 #endif /* HAVE_PERFSTAT */
185 } /* }}} int uptime_get_sys */
187 static int uptime_read(void) {
191 /* calculate the amount of time elapsed since boot, AKA uptime */
192 elapsed = uptime_get_sys();
194 uptime = (gauge_t)elapsed;
196 uptime_submit(uptime);
201 void module_register(void) {
202 plugin_register_read("uptime", uptime_read);
203 } /* void module_register */