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      1 /*
      2  * Create a squashfs filesystem.  This is a highly compressed read only
      3  * filesystem.
      4  *
      5  * Copyright (c) 2013
      6  * Phillip Lougher <phillip (at) squashfs.org.uk>
      7  *
      8  * This program is free software; you can redistribute it and/or
      9  * modify it under the terms of the GNU General Public License
     10  * as published by the Free Software Foundation; either version 2,
     11  * or (at your option) any later version.
     12  *
     13  * This program is distributed in the hope that it will be useful,
     14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
     15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
     16  * GNU General Public License for more details.
     17  *
     18  * You should have received a copy of the GNU General Public License
     19  * along with this program; if not, write to the Free Software
     20  * Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
     21  *
     22  * unsquashfs_info.c
     23  */
     24 
     25 #include <pthread.h>
     26 #include <sys/ioctl.h>
     27 #include <unistd.h>
     28 #include <signal.h>
     29 #include <sys/time.h>
     30 #include <stdio.h>
     31 #include <math.h>
     32 #include <stdarg.h>
     33 #include <errno.h>
     34 #include <stdlib.h>
     35 #include <dirent.h>
     36 #include <sys/types.h>
     37 #include <sys/stat.h>
     38 #include <string.h>
     39 
     40 #include "squashfs_fs.h"
     41 #include "unsquashfs.h"
     42 #include "error.h"
     43 
     44 static int silent = 0;
     45 char *pathname = NULL;
     46 
     47 pthread_t info_thread;
     48 
     49 
     50 void disable_info()
     51 {
     52 	if(pathname)
     53 		free(pathname);
     54 
     55 	pathname = NULL;
     56 }
     57 
     58 
     59 void update_info(char *name)
     60 {
     61 	if(pathname)
     62 		free(pathname);
     63 
     64 	pathname = name;
     65 }
     66 
     67 
     68 void dump_state()
     69 {
     70 	disable_progress_bar();
     71 
     72 	printf("Queue and cache status dump\n");
     73 	printf("===========================\n");
     74 
     75 	printf("file buffer read queue (main thread -> reader thread)\n");
     76 	dump_queue(to_reader);
     77 
     78 	printf("file buffer decompress queue (reader thread -> inflate"
     79 							" thread(s))\n");
     80 	dump_queue(to_inflate);
     81 
     82 	printf("file buffer write queue (main thread -> writer thread)\n");
     83 	dump_queue(to_writer);
     84 
     85 	printf("\nbuffer cache (uncompressed blocks and compressed blocks "
     86 							"'in flight')\n");
     87 	dump_cache(data_cache);
     88 
     89 	printf("fragment buffer cache (uncompressed frags and compressed"
     90 						" frags 'in flight')\n");
     91 	dump_cache(fragment_cache);
     92 
     93 	enable_progress_bar();
     94 }
     95 
     96 
     97 void *info_thrd(void *arg)
     98 {
     99 	sigset_t sigmask;
    100 	int sig, err, waiting = 0;
    101 
    102 	sigemptyset(&sigmask);
    103 	sigaddset(&sigmask, SIGQUIT);
    104 	sigaddset(&sigmask, SIGHUP);
    105 	sigaddset(&sigmask, SIGALRM);
    106 
    107 	while(1) {
    108 		err = sigwait(&sigmask, &sig);
    109 
    110 		if(err == -1) {
    111 			switch(errno) {
    112 			case EINTR:
    113 				continue;
    114 			default:
    115 				BAD_ERROR("sigwait failed "
    116 					"because %s\n", strerror(errno));
    117 			}
    118 		}
    119 
    120 		if(sig == SIGQUIT && !waiting) {
    121 			if(pathname)
    122 				INFO("%s\n", pathname);
    123 
    124 			/* set one second interval period, if ^\ received
    125 			   within then, dump queue and cache status */
    126 			waiting = 1;
    127 			alarm(1);
    128 		} else if (sig == SIGQUIT) {
    129 			dump_state();
    130 		} else if (sig == SIGALRM) {
    131 			waiting = 0;
    132 		}
    133 	}
    134 }
    135 
    136 
    137 void init_info()
    138 {
    139 	pthread_create(&info_thread, NULL, info_thrd, NULL);
    140 }
    141