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/* Determine the time when the machine last booted.
Copyright (C) 2023-2025 Free Software Foundation, Inc.
This file is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published
by the Free Software Foundation, either version 3 of the License,
or (at your option) any later version.
This file 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>. */
/* Written by Bruno Haible <bruno@clisp.org>. */
#ifndef _BOOT_TIME_H
#define _BOOT_TIME_H
#include <time.h>
#ifdef __cplusplus
extern "C" {
#endif
/* Store the approximate time when the machine last booted in *P_BOOT_TIME,
and return 0. If it cannot be determined, return -1.
If the machine is a container inside another host machine,
return the boot time of the container, not the host.
The difference can matter in GNU/Linux, where times in /proc/stat
might be relative to boot time of the host, not the container.
This function is not multithread-safe, since on many platforms it
invokes the functions setutxent, getutxent, endutxent.
These functions may lock a file like /var/log/wtmp (so that we
don't read garbage when a concurrent process writes to that file),
but their drawback is that they have a common global state. */
extern int get_boot_time (struct timespec *p_boot_time);
#ifdef __cplusplus
}
#endif
#endif /* _BOOT_TIME_H */
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