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/* Determine the time when the machine last booted.
Copyright (C) 2023-2024 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>. */
#include <config.h>
/* Specification. */
#include "boot-time.h"
#include <stddef.h>
#include <stdio.h>
#include <string.h>
#include <sys/types.h>
#include <sys/stat.h>
#if defined __linux__ || defined __ANDROID__
# include <sys/sysinfo.h>
# include <time.h>
#endif
#if HAVE_SYS_SYSCTL_H && !(defined __GLIBC__ && defined __linux__) && !defined __minix
# if HAVE_SYS_PARAM_H
# include <sys/param.h>
# endif
# include <sys/sysctl.h>
#endif
#if HAVE_OS_H
# include <OS.h>
#endif
#include "idx.h"
#include "readutmp.h"
#include "stat-time.h"
/* Each of the FILE streams in this file is only used in a single thread. */
#include "unlocked-io.h"
/* Some helper functions. */
#include "boot-time-aux.h"
/* The following macros describe the 'struct UTMP_STRUCT_NAME',
*not* 'struct gl_utmp'. */
#undef UT_USER
/* Accessor macro for the member named ut_user or ut_name. */
#if (HAVE_UTMPX_H ? HAVE_STRUCT_UTMPX_UT_NAME \
: HAVE_UTMP_H && HAVE_STRUCT_UTMP_UT_NAME)
# define UT_USER(UT) ((UT)->ut_name)
#else
# define UT_USER(UT) ((UT)->ut_user)
#endif
#if !HAVE_UTMPX_H && HAVE_UTMP_H && defined UTMP_NAME_FUNCTION
# if !HAVE_DECL_ENDUTENT /* Android */
void endutent (void);
# endif
#endif
#if defined __linux__ || HAVE_UTMPX_H || HAVE_UTMP_H || defined __CYGWIN__ || defined _WIN32
static int
get_boot_time_uncached (struct timespec *p_boot_time)
{
struct timespec found_boot_time = {0};
# if (HAVE_UTMPX_H ? HAVE_STRUCT_UTMPX_UT_TYPE : HAVE_STRUCT_UTMP_UT_TYPE)
/* Try to find the boot time in the /var/run/utmp file. */
# if defined UTMP_NAME_FUNCTION /* glibc, musl, macOS, FreeBSD, NetBSD, Minix, AIX, IRIX, Solaris, Cygwin, Android */
/* Ignore the return value for now.
Solaris' utmpname returns 1 upon success -- which is contrary
to what the GNU libc version does. In addition, older GNU libc
versions are actually void. */
UTMP_NAME_FUNCTION ((char *) UTMP_FILE);
SET_UTMP_ENT ();
# if (defined __linux__ && !defined __ANDROID__) || defined __minix
/* Timestamp of the "runlevel" entry, if any. */
struct timespec runlevel_ts = {0};
# endif
void const *entry;
while ((entry = GET_UTMP_ENT ()) != NULL)
{
struct UTMP_STRUCT_NAME const *ut = (struct UTMP_STRUCT_NAME const *) entry;
struct timespec ts =
#if (HAVE_UTMPX_H ? 1 : HAVE_STRUCT_UTMP_UT_TV)
{ .tv_sec = ut->ut_tv.tv_sec, .tv_nsec = ut->ut_tv.tv_usec * 1000 };
#else
{ .tv_sec = ut->ut_time, .tv_nsec = 0 };
#endif
if (ut->ut_type == BOOT_TIME)
found_boot_time = ts;
# if defined __linux__ && !defined __ANDROID__
if (memcmp (UT_USER (ut), "runlevel", strlen ("runlevel") + 1) == 0
&& memcmp (ut->ut_line, "~", strlen ("~") + 1) == 0)
runlevel_ts = ts;
# endif
# if defined __minix
if (UT_USER (ut)[0] == '\0'
&& memcmp (ut->ut_line, "run-level ", strlen ("run-level ")) == 0)
runlevel_ts = ts;
# endif
}
END_UTMP_ENT ();
# if defined __linux__ && !defined __ANDROID__
/* On Raspbian, which runs on hardware without a real-time clock, during boot,
1. the clock gets set to 1970-01-01 00:00:00,
2. an entry gets written into /var/run/utmp, with ut_type = BOOT_TIME,
ut_user = "reboot", ut_line = "~", time = 1970-01-01 00:00:05 or so,
3. the clock gets set to a correct value through NTP,
4. an entry gets written into /var/run/utmp, with
ut_user = "runlevel", ut_line = "~", time = correct value.
In this case, get the time from the "runlevel" entry. */
/* Workaround for Raspbian: */
if (found_boot_time.tv_sec <= 60 && runlevel_ts.tv_sec != 0)
found_boot_time = runlevel_ts;
if (found_boot_time.tv_sec == 0)
{
/* Workaround for Alpine Linux: */
get_linux_boot_time_fallback (&found_boot_time);
}
# endif
# if defined __ANDROID__
if (found_boot_time.tv_sec == 0)
{
/* Workaround for Android: */
get_android_boot_time (&found_boot_time);
}
# endif
# if defined __minix
/* On Minix, during boot,
1. an entry gets written into /var/run/utmp, with ut_type = BOOT_TIME,
ut_user = "", ut_line = "system boot", time = 1970-01-01 00:00:00,
2. an entry gets written into /var/run/utmp, with
ut_user = "", ut_line = "run-level m", time = correct value.
In this case, copy the time from the "run-level m" entry to the
"system boot" entry. */
if (found_boot_time.tv_sec <= 60 && runlevel_ts.tv_sec != 0)
found_boot_time = runlevel_ts;
# endif
# else /* HP-UX, Haiku */
FILE *f = fopen (UTMP_FILE, "re");
if (f != NULL)
{
for (;;)
{
struct UTMP_STRUCT_NAME ut;
if (fread (&ut, sizeof ut, 1, f) == 0)
break;
struct timespec ts =
#if (HAVE_UTMPX_H ? 1 : HAVE_STRUCT_UTMP_UT_TV)
{ .tv_sec = ut.ut_tv.tv_sec, .tv_nsec = ut.ut_tv.tv_usec * 1000 };
#else
{ .tv_sec = ut.ut_time, .tv_nsec = 0 };
#endif
if (ut.ut_type == BOOT_TIME)
found_boot_time = ts;
}
fclose (f);
}
# endif
# if defined __linux__ && !defined __ANDROID__
if (found_boot_time.tv_sec == 0)
{
get_linux_boot_time_final_fallback (&found_boot_time);
}
# endif
# else /* old FreeBSD, OpenBSD, native Windows */
# if defined __OpenBSD__
/* Workaround for OpenBSD: */
get_openbsd_boot_time (&found_boot_time);
# endif
# endif
# if HAVE_SYS_SYSCTL_H && HAVE_SYSCTL \
&& defined CTL_KERN && defined KERN_BOOTTIME \
&& !defined __minix
if (found_boot_time.tv_sec == 0)
{
get_bsd_boot_time_final_fallback (&found_boot_time);
}
# endif
# if defined __HAIKU__
if (found_boot_time.tv_sec == 0)
{
get_haiku_boot_time (&found_boot_time);
}
# endif
# if HAVE_OS_H
if (found_boot_time.tv_sec == 0)
{
get_haiku_boot_time_final_fallback (&found_boot_time);
}
# endif
# if defined __CYGWIN__ || defined _WIN32
if (found_boot_time.tv_sec == 0)
{
/* Workaround for Windows: */
get_windows_boot_time (&found_boot_time);
}
# endif
if (found_boot_time.tv_sec != 0)
{
*p_boot_time = found_boot_time;
return 0;
}
else
return -1;
}
int
get_boot_time (struct timespec *p_boot_time)
{
/* Cache the result from get_boot_time_uncached. */
static int volatile cached_result = -1;
static struct timespec volatile cached_boot_time;
if (cached_result < 0)
{
struct timespec boot_time;
int result = get_boot_time_uncached (&boot_time);
cached_boot_time = boot_time;
cached_result = result;
}
if (cached_result == 0)
{
*p_boot_time = cached_boot_time;
return 0;
}
else
return -1;
}
#else
int
get_boot_time (struct timespec *p_boot_time)
{
return -1;
}
#endif
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