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82 lines
1.9 KiB
C
82 lines
1.9 KiB
C
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/*
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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 "virthread.h"
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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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#ifdef HAVE_GETUTXID
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static void
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virHostGetBootTimeOnceInit(void)
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{
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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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}
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#else /* !HAVE_GETUTXID */
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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 /* HAVE_GETUTXID */
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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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