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When we want to know the boot timestamp of the host, we can call virHostGetBootTime(). Under the hood, it uses getutxid() which is defined by POSIX and properly check for in configure. However, musl took a path where it declares the function but instead of providing any useful implementation it returns NULL meaning "no record found". If that's the case, use our second best option - /proc/uptime and a bit of maths. https://bugzilla.redhat.com/show_bug.cgi?id=1760885 Signed-off-by: Michal Privoznik <mprivozn@redhat.com> Reviewed-by: Cole Robinson <crobinso@redhat.com>
138 lines
3.3 KiB
C
138 lines
3.3 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 HAVE_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(HAVE_GETUTXID) || defined(__linux__)
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static void
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virHostGetBootTimeOnceInit(void)
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{
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# ifdef HAVE_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 /* HAVE_GETUTXID */
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if (bootTimeErrno != 0 || bootTime == 0)
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bootTimeErrno = -virHostGetBootTimeProcfs(&bootTime);
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}
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#else /* !defined(HAVE_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(HAVE_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 (virOnce(&virHostGetBootTimeOnce, virHostGetBootTimeOnceInit) < 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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