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