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/* virtual-backup.c
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Copyright (c) 2000-2004 Craig Condit, Stefan Hülswitt.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are met:
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1. Redistributions of source code must retain the above copyright notice,
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this list of conditions and the following disclaimer.
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2. Redistributions in binary form must reproduce the above copyright notice,
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this list of conditions and the following disclaimer in the documentation
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and/or other materials provided with the distribution.
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THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
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OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR
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ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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SUCH DAMAGE.
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*/
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#define _LARGEFILE64_SOURCE
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#define _GNU_SOURCE
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#include <stdlib.h>
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#include <stdio.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <errno.h>
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#include <string.h>
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#include <sys/wait.h>
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#include <sys/stat.h>
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#include "virtual.h"
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#include "cdbackup.h"
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#include "cdrom.h"
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#include "misc.h"
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#include "debug.h"
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//#define DEBUGOUT
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extern int virtual, multi;
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extern int fd;
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extern struct virt_header *virt_header;
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extern int virtualMissing;
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extern char *real_virt_name;
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#ifndef DEBUGOUT
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static pid_t childpid;
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#endif
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static int vfd=-1;
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/****************************************************************************/
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void VnewTrack(void)
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{
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if(virtual) {
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long long pos;
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if(virtualMissing) {
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if((fd=open64(real_virt_name,O_RDWR|O_CREAT,S_IRUSR|S_IWUSR|S_IRGRP| S_IROTH))<0) error("Open failed (new track)");
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if(write(fd,virt_header,CD_FRAMESIZE)!=CD_FRAMESIZE) error("Write failed (new track)");
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virtualMissing=0;
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}
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if(virt_header->tracks>=MAX_VIRT_TRACKS-1) serror("Maximum number of virtual tracks reached");
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pos=(virt_header->start[virt_header->tracks]=virt_header->leadout)*CD_FRAMESIZE;
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virt_header->tracks++;
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if(lseek64(fd,pos,SEEK_SET)<0) error("Seek failed (new track)");
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}
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else {
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#ifndef DEBUGOUT
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int pd[2];
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Vclose();
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if(pipe(pd)<0) error("Pipe failed (new track)");
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if((childpid=fork())<0) error("Fork failed (new track)");
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if(childpid==0) { /* child */
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close(pd[1]);
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close(0);
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dup2(pd[0],0);
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start_cdrecord(); /* doesn't returns */
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}
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close(pd[0]); fd=pd[1];
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#else
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/* debug code; send data to /dev/null. */
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Vclose();
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fprintf(stderr,"DEBUG CODE: NO recording, sending data to /dev/null!\n");
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if((fd=open("/dev/null",O_WRONLY))<0) error("Open failed (/dev/null)");
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#endif
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cd_avail-=padsize*CD_FRAMESIZE;
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}
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}
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/****************************************************************************/
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int Vsize(void)
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{
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return virt_header->leadout;
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}
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/****************************************************************************/
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int VhasCont(void)
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{
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return virt_header->has_cont;
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}
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/****************************************************************************/
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void VprepareDump(void)
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{
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if((vfd=dup(fd))<0) error("Dup failed");
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Vclose();
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}
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/****************************************************************************/
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void VvirtRead(void *buf)
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{
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if(full_read(vfd,buf,CD_FRAMESIZE)!=CD_FRAMESIZE)
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serror("Unexpected EOF reading data");
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}
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/****************************************************************************/
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void VcloseTrack(int cont)
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{
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if(virtual) {
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if(lseek64(fd,0,SEEK_SET)<0) error("Seek failed (close track)");
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virt_header->has_cont=cont;
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if(write(fd,virt_header,CD_FRAMESIZE)!=CD_FRAMESIZE) error("Write failed (close track)");
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Vclose();
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}
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else {
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Vclose();
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#ifndef DEBUGOUT
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DEBUG("VcloseTrack: waiting for child termination\n");
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while(wait(0)!=childpid);
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#endif
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}
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if(vfd>=0) { close(vfd); vfd=-1; }
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}
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/****************************************************************************/
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void Vwrite(const void *buf)
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{
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if(write(fd,buf,CD_FRAMESIZE)!=CD_FRAMESIZE) error("Write failed");
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if(virtual) virt_header->leadout++;
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cd_avail-=CD_FRAMESIZE;
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}
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