6e8323e9fb
This information can be read by the "runlevel" command as well as "halt" and "reboot". Having the information logged in /var/run/runlevel as well as the utmp file means systems without utmp (like those running the musl C library) can still check the current runlevel. This is useful when running halt/reboot as these programs want to check the runlevel. Updated the changelog, and manual pages for halt and runlevel.
71 lines
1.9 KiB
C
71 lines
1.9 KiB
C
/*
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* runlevellog - Saves and restores runlevel from distor-neutral location.
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*
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*
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* This file is part of the sysvinit suite,
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* Copyright (C) 2018 Jesse Smith
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*
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* This program 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 by
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* the Free Software Foundation; version 2 of the License.
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*
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* This program 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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*
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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, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include <stdio.h>
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#include "paths.h"
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#include "runlevellog.h"
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/*
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Write the current runlevel to its log file.
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The function returns TRUE on success and FALSE
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on failure.
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*/
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int Write_Runlevel_Log(int new_runlevel)
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{
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FILE *log_file;
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int status;
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log_file = fopen(RUNLEVEL_LOG, "w");
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if (! log_file)
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return FALSE;
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status = fprintf(log_file, "%c", new_runlevel);
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fclose(log_file);
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if (status < 1)
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return FALSE;
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return TRUE;
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}
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/*
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This function reads the last runlevel from the log file.
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The function stores the read value at the addressed passed
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into the function (aka runlevel). The function returns
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TRUE on success and FALSE on failure.
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*/
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int Read_Runlevel_Log(int *runlevel)
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{
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FILE *log_file;
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int status;
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log_file = fopen(RUNLEVEL_LOG, "r");
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if (! log_file)
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return FALSE;
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status = fscanf(log_file, "%c", (char *) runlevel);
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fclose(log_file);
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if (status < 1)
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return FALSE;
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return TRUE;
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}
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