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/*
* Create a squashfs filesystem. This is a highly compressed read only
* filesystem.
*
* Copyright (c) 2013, 2014, 2019, 2021
* Phillip Lougher <phillip@squashfs.org.uk>
*
* This program 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 2,
* or (at your option) any later version.
*
* This program 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, write to the Free Software
* Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
* restore.c
*/
#include <pthread.h>
#include <sys/ioctl.h>
#include <unistd.h>
#include <signal.h>
#include <sys/time.h>
#include <stdio.h>
#include <math.h>
#include <stdarg.h>
#include <errno.h>
#include <stdlib.h>
#include <dirent.h>
#include <sys/types.h>
#include <sys/stat.h>
#include "caches-queues-lists.h"
#include "squashfs_fs.h"
#include "mksquashfs.h"
#include "mksquashfs_error.h"
#include "progressbar.h"
#include "info.h"
#define FALSE 0
#define TRUE 1
extern pthread_t reader_thread, writer_thread, main_thread, order_thread;
extern pthread_t *deflator_thread, *frag_deflator_thread, *frag_thread;
extern struct queue *to_deflate, *to_writer, *to_frag, *to_process_frag;
extern struct seq_queue *to_main, *to_order;
extern void restorefs();
extern int processors;
extern int reproducible;
static int interrupted = 0;
static pthread_t restore_thread;
void *restore_thrd(void *arg)
{
sigset_t sigmask, old_mask;
int i, sig;
sigemptyset(&sigmask);
sigaddset(&sigmask, SIGINT);
sigaddset(&sigmask, SIGTERM);
sigaddset(&sigmask, SIGUSR1);
pthread_sigmask(SIG_BLOCK, &sigmask, &old_mask);
while(1) {
sigwait(&sigmask, &sig);
if((sig == SIGINT || sig == SIGTERM) && !interrupted) {
ERROR("Interrupting will restore original "
"filesystem!\n");
ERROR("Interrupt again to quit\n");
interrupted = TRUE;
continue;
}
/* kill main thread/worker threads and restore */
set_progressbar_state(FALSE);
disable_info();
/* first kill the reader thread */
pthread_cancel(reader_thread);
pthread_join(reader_thread, NULL);
/*
* then flush the reader to deflator thread(s) output queue.
* The deflator thread(s) will idle
*/
queue_flush(to_deflate);
/* now kill the deflator thread(s) */
for(i = 0; i < processors; i++)
pthread_cancel(deflator_thread[i]);
for(i = 0; i < processors; i++)
pthread_join(deflator_thread[i], NULL);
/*
* then flush the reader to process fragment thread(s) output
* queue. The process fragment thread(s) will idle
*/
queue_flush(to_process_frag);
/* now kill the process fragment thread(s) */
for(i = 0; i < processors; i++)
pthread_cancel(frag_thread[i]);
for(i = 0; i < processors; i++)
pthread_join(frag_thread[i], NULL);
/*
* then flush the reader/deflator/process fragment to main
* thread output queue. The main thread will idle
*/
seq_queue_flush(to_main);
/* now kill the main thread */
pthread_cancel(main_thread);
pthread_join(main_thread, NULL);
/* then flush the main thread to fragment deflator thread(s)
* queue. The fragment deflator thread(s) will idle
*/
queue_flush(to_frag);
/* now kill the fragment deflator thread(s) */
for(i = 0; i < processors; i++)
pthread_cancel(frag_deflator_thread[i]);
for(i = 0; i < processors; i++)
pthread_join(frag_deflator_thread[i], NULL);
if(reproducible) {
/* then flush the fragment deflator_threads(s)
* to frag orderer thread. The frag orderer
* thread will idle
*/
seq_queue_flush(to_order);
/* now kill the frag orderer thread */
pthread_cancel(order_thread);
pthread_join(order_thread, NULL);
}
/*
* then flush the main thread/fragment deflator thread(s)
* to writer thread queue. The writer thread will idle
*/
queue_flush(to_writer);
/* now kill the writer thread */
pthread_cancel(writer_thread);
pthread_join(writer_thread, NULL);
TRACE("All threads cancelled\n");
restorefs();
}
}
pthread_t *init_restore_thread()
{
pthread_create(&restore_thread, NULL, restore_thrd, NULL);
return &restore_thread;
}
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