Re: [libvirt] [PATCH 4/5] util: Introduce virhostuptime

This module contains function to get host boot time. Signed-off-by: Michal Privoznik <mprivozn(a)redhat.com&gt; --- src/libvirt_private.syms | 4 +++ src/util/Makefile.inc.am | 2 ++ src/util/virhostuptime.c | 61 ++++++++++++++++++++++++++++++++++++++++ src/util/virhostuptime.h | 27 ++++++++++++++++++ 4 files changed, 94 insertions(+) create mode 100644 src/util/virhostuptime.c create mode 100644 src/util/virhostuptime.h diff --git a/src/libvirt_private.syms b/src/libvirt_private.syms index 7a3feb8efa..bed00c3cb8 100644 --- a/src/libvirt_private.syms +++ b/src/libvirt_private.syms @@ -2135,6 +2135,10 @@ virHostMemGetStats; virHostMemSetParameters; +# util/virhostuptime.h +virHostGetBootTime; + + # util/viridentity.h virIdentityGetAttr; virIdentityGetCurrent; diff --git a/src/util/Makefile.inc.am b/src/util/Makefile.inc.am index a47f333a98..46866cf213 100644 --- a/src/util/Makefile.inc.am +++ b/src/util/Makefile.inc.am @@ -91,6 +91,8 @@ UTIL_SOURCES = \ util/virhostdev.h \ util/virhostmem.c \ util/virhostmem.h \ + util/virhostuptime.c \ + util/virhostuptime.h \ util/viridentity.c \ util/viridentity.h \ util/virinitctl.c \ diff --git a/src/util/virhostuptime.c b/src/util/virhostuptime.c new file mode 100644 index 0000000000..f48de672e6 --- /dev/null +++ b/src/util/virhostuptime.c @@ -0,0 +1,61 @@ +/* + * virhostuptime.c: helper APIs for host uptime + * + * Copyright (C) 2019 Red Hat, Inc. + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; either + * version 2.1 of the License, or (at your option) any later version. + * + * This library is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with this library. If not, see + * <http://www.gnu.org/licenses/>;. + */ + +#include <config.h> + +#if defined(__linux__) || defined(__FreeBSD__) +# include <utmpx.h> +#endif + +#include "virhostuptime.h" + + +/** + * virHostGetBootTime: + * @when: UNIX timestamp of boot time + * + * Get a UNIX timestamp of host boot time and store it at @when. + * Note that this function is not reentrant. + * + * Return: 0 on success, + * -1 otherwise. + */ +int +virHostGetBootTime(unsigned long long *when ATTRIBUTE_UNUSED) +{ +#if defined(__linux__) || defined(__FreeBSD__)

+ struct utmpx id = {.ut_type = BOOT_TIME}; + struct utmpx *res = NULL; + + if (!(res = getutxid(&id))) {

+ int theerrno = errno; + endutxent(); + return -theerrno; + } + + *when = res->ut_tv.tv_sec; + endutxent(); + return 0; +#else + /* Unfortunately, mingw lacks utmp */ + errno = ENOSYS; + return -errno; +#endif +}