This module contains function to get host boot time. Signed-off-by: Michal Privoznik <mprivozn@xxxxxxxxxx> --- configure.ac | 1 + src/libvirt_private.syms | 4 ++ src/util/Makefile.inc.am | 2 + src/util/virhostuptime.c | 81 ++++++++++++++++++++++++++++++++++++++++ src/util/virhostuptime.h | 27 ++++++++++++++ 5 files changed, 115 insertions(+) create mode 100644 src/util/virhostuptime.c create mode 100644 src/util/virhostuptime.h diff --git a/configure.ac b/configure.ac index f41c6d5d86..6744ace578 100644 --- a/configure.ac +++ b/configure.ac @@ -337,6 +337,7 @@ AC_CHECK_FUNCS_ONCE([\ getpwuid_r \ getrlimit \ getuid \ + getutxid \ if_indextoname \ mmap \ newlocale \ diff --git a/src/libvirt_private.syms b/src/libvirt_private.syms index 9db4ac7933..c230a852e7 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..62b781acd5 --- /dev/null +++ b/src/util/virhostuptime.c @@ -0,0 +1,81 @@ +/* + * 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> + +#ifdef HAVE_GETUTXID +# include <utmpx.h> +#endif + +#include "virhostuptime.h" +#include "virthread.h" + +static unsigned long long bootTime; +static int bootTimeErrno; +static virOnceControl virHostGetBootTimeOnce = VIR_ONCE_CONTROL_INITIALIZER; + +#ifdef HAVE_GETUTXID +static void +virHostGetBootTimeOnceInit(void) +{ + struct utmpx id = {.ut_type = BOOT_TIME}; + struct utmpx *res = NULL; + + if (!(res = getutxid(&id))) { + bootTimeErrno = errno; + } else { + bootTime = res->ut_tv.tv_sec; + } + + endutxent(); +} + +#else /* !HAVE_GETUTXID */ + +static void +virHostGetBootTimeOnceInit(void) +{ + bootTimeErrno = ENOSYS; +} +#endif /* HAVE_GETUTXID */ + +/** + * virHostGetBootTime: + * @when: UNIX timestamp of boot time + * + * Get a UNIX timestamp of host boot time and store it at @when. + * + * Return: 0 on success, + * -1 otherwise. + */ +int +virHostGetBootTime(unsigned long long *when) +{ + if (virOnce(&virHostGetBootTimeOnce, virHostGetBootTimeOnceInit) < 0) + return -1; + + if (bootTimeErrno) { + errno = bootTimeErrno; + return -1; + } + + *when = bootTime; + return 0; +} diff --git a/src/util/virhostuptime.h b/src/util/virhostuptime.h new file mode 100644 index 0000000000..03c1517a64 --- /dev/null +++ b/src/util/virhostuptime.h @@ -0,0 +1,27 @@ +/* + * virhostuptime.h: 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/>. + */ + +#pragma once + +#include "internal.h" + +int +virHostGetBootTime(unsigned long long *when) + ATTRIBUTE_NOINLINE; -- 2.21.0 -- libvir-list mailing list libvir-list@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/libvir-list
