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95b9db4ee2
Currently, we are mixing: #if HAVE_BLAH with #if WITH_BLAH.
Things got way better with Pavel's work on meson, but apparently,
mixing these two lead to confusing and easy to miss bugs (see
31fb929eca for instance). While we were forced to use HAVE_
prefix with autotools, we are free to chose our own prefix with
meson and since WITH_ prefix appears to be more popular let's use
it everywhere.
Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
Reviewed-by: Ján Tomko <jtomko@redhat.com>
150 lines
3.4 KiB
C
150 lines
3.4 KiB
C
/*
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* virhostuptime.c: helper APIs for host uptime
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*
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* Copyright (C) 2019 Red Hat, Inc.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library. If not, see
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* <http://www.gnu.org/licenses/>.
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*/
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#include <config.h>
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#ifdef WITH_GETUTXID
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# include <utmpx.h>
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#endif
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#include "virhostuptime.h"
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#include "viralloc.h"
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#include "virfile.h"
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#include "virlog.h"
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#include "virstring.h"
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#include "virtime.h"
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#include "virthread.h"
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#define VIR_FROM_THIS VIR_FROM_NONE
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VIR_LOG_INIT("util.virhostuptime");
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static unsigned long long bootTime;
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static int bootTimeErrno;
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static virOnceControl virHostGetBootTimeOnce = VIR_ONCE_CONTROL_INITIALIZER;
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#if defined(__linux__)
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# define UPTIME_FILE "/proc/uptime"
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static int
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virHostGetBootTimeProcfs(unsigned long long *btime)
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{
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unsigned long long now;
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double up;
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g_autofree char *buf = NULL;
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char *tmp;
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if (virTimeMillisNow(&now) < 0)
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return -errno;
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/* 1KiB limit is more than enough. */
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if (virFileReadAll(UPTIME_FILE, 1024, &buf) < 0)
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return -errno;
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/* buf contains two doubles now:
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* $uptime $idle_time
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* We're interested only in the first one */
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if (!(tmp = strchr(buf, ' '))) {
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virReportError(VIR_ERR_INTERNAL_ERROR,
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_("uptime file has unexpected format '%s'"),
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buf);
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return -EINVAL;
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}
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*tmp = '\0';
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if (virStrToDouble(buf, NULL, &up) < 0) {
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virReportError(VIR_ERR_INTERNAL_ERROR,
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_("Unable to parse uptime value '%s'"),
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buf);
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return -EINVAL;
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}
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*btime = now / 1000 - up + 0.5;
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return 0;
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}
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#endif /* defined(__linux__) */
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#if defined(WITH_GETUTXID) || defined(__linux__)
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static void
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virHostGetBootTimeOnceInit(void)
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{
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# ifdef WITH_GETUTXID
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struct utmpx id = {.ut_type = BOOT_TIME};
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struct utmpx *res = NULL;
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if (!(res = getutxid(&id))) {
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bootTimeErrno = errno;
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} else {
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bootTime = res->ut_tv.tv_sec;
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}
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endutxent();
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# endif /* WITH_GETUTXID */
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# ifdef __linux__
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if (bootTimeErrno != 0 || bootTime == 0)
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bootTimeErrno = -virHostGetBootTimeProcfs(&bootTime);
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# endif /* __linux__ */
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}
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#else /* !defined(WITH_GETUTXID) && !defined(__linux__) */
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static void
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virHostGetBootTimeOnceInit(void)
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{
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bootTimeErrno = ENOSYS;
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}
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#endif /* !defined(WITH_GETUTXID) && !defined(__linux__) */
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/**
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* virHostGetBootTime:
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* @when: UNIX timestamp of boot time
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*
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* Get a UNIX timestamp of host boot time and store it at @when.
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*
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* Return: 0 on success,
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* -1 otherwise.
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*/
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int
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virHostGetBootTime(unsigned long long *when)
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{
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if (virHostBootTimeInit() < 0)
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return -1;
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if (bootTimeErrno) {
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errno = bootTimeErrno;
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return -1;
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}
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*when = bootTime;
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return 0;
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}
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int
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virHostBootTimeInit(void)
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{
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if (virOnce(&virHostGetBootTimeOnce, virHostGetBootTimeOnceInit) < 0)
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return -1;
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return 0;
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}
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