nathan@4: /* virtual-backup.c
nathan@4: Copyright (c) 2000-2004 Craig Condit, Stefan Hülswitt.
nathan@4: 
nathan@4: Redistribution and use in source and binary forms, with or without
nathan@4: modification, are permitted provided that the following conditions are met: 
nathan@4: 
nathan@4: 1. Redistributions of source code must retain the above copyright notice,
nathan@4:    this list of conditions and the following disclaimer. 
nathan@4: 2. Redistributions in binary form must reproduce the above copyright notice,
nathan@4:    this list of conditions and the following disclaimer in the documentation
nathan@4:    and/or other materials provided with the distribution. 
nathan@4: 
nathan@4: THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
nathan@4: OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
nathan@4: WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
nathan@4: DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR
nathan@4: ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
nathan@4: DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
nathan@4: SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
nathan@4: CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
nathan@4: LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
nathan@4: OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
nathan@4: SUCH DAMAGE.
nathan@4: */
nathan@4: 
nathan@4: #define _LARGEFILE64_SOURCE
nathan@4: #define _GNU_SOURCE
nathan@4: 
nathan@4: #include <stdlib.h>
nathan@4: #include <stdio.h>
nathan@4: #include <unistd.h>
nathan@4: #include <fcntl.h>
nathan@4: #include <errno.h>
nathan@4: #include <string.h>
nathan@4: #include <sys/wait.h>
nathan@4: #include <sys/stat.h>
nathan@4: 
nathan@4: #include "virtual.h"
nathan@4: #include "cdbackup.h"
nathan@4: #include "cdrom.h"
nathan@4: #include "misc.h"
nathan@4: #include "debug.h"
nathan@4: 
nathan@4: //#define DEBUGOUT
nathan@4: 
nathan@4: extern int virtual, multi;
nathan@4: 
nathan@4: extern int fd;
nathan@4: extern struct virt_header *virt_header;
nathan@4: extern int virtualMissing;
nathan@4: extern char *real_virt_name;
nathan@4: 
nathan@4: #ifndef DEBUGOUT
nathan@4: static pid_t childpid;
nathan@4: #endif
nathan@4: static int vfd=-1;
nathan@4: 
nathan@4: /****************************************************************************/
nathan@4: 
nathan@4: void VnewTrack(void)
nathan@4: {
nathan@4:   if(virtual) {
nathan@4:     long long pos;
nathan@4:     if(virtualMissing) {
nathan@4:       if((fd=open64(real_virt_name,O_RDWR|O_CREAT,S_IRUSR|S_IWUSR|S_IRGRP| S_IROTH))<0) error("Open failed (new track)");
nathan@4:       if(write(fd,virt_header,CD_FRAMESIZE)!=CD_FRAMESIZE) error("Write failed (new track)");
nathan@4:       virtualMissing=0;
nathan@4:       }
nathan@4:     if(virt_header->tracks>=MAX_VIRT_TRACKS-1) serror("Maximum number of virtual tracks reached");
nathan@6:     pos=(long long)(virt_header->start[virt_header->tracks]=virt_header->leadout)*CD_FRAMESIZE;
nathan@4:     virt_header->tracks++;
nathan@4:     if(lseek64(fd,pos,SEEK_SET)<0) error("Seek failed (new track)");
nathan@4:     }
nathan@4:   else {
nathan@4: #ifndef DEBUGOUT
nathan@4:     int pd[2];
nathan@4:     Vclose();
nathan@4:     if(pipe(pd)<0) error("Pipe failed (new track)");
nathan@4:     if((childpid=fork())<0) error("Fork failed (new track)");
nathan@4:     if(childpid==0) { /* child */
nathan@4:       close(pd[1]);
nathan@4:       close(0);
nathan@4:       dup2(pd[0],0);
nathan@4:       start_cdrecord(); /* doesn't returns */
nathan@4:       }
nathan@4:     close(pd[0]); fd=pd[1];
nathan@4: #else
nathan@4:     /* debug code; send data to /dev/null. */
nathan@4:     Vclose();
nathan@4:     fprintf(stderr,"DEBUG CODE: NO recording, sending data to /dev/null!\n");
nathan@4:     if((fd=open("/dev/null",O_WRONLY))<0) error("Open failed (/dev/null)");
nathan@4: #endif
nathan@4:     cd_avail-=padsize*CD_FRAMESIZE;
nathan@4:     }
nathan@4: }
nathan@4: 
nathan@4: /****************************************************************************/
nathan@4: 
nathan@4: int Vsize(void)
nathan@4: {
nathan@4:   return virt_header->leadout;
nathan@4: }
nathan@4: 
nathan@4: /****************************************************************************/
nathan@4: 
nathan@4: int VhasCont(void)
nathan@4: {
nathan@4:   return virt_header->has_cont;
nathan@4: }
nathan@4: 
nathan@4: /****************************************************************************/
nathan@4: 
nathan@4: void VprepareDump(void)
nathan@4: {
nathan@4:   if((vfd=dup(fd))<0) error("Dup failed");
nathan@4:   Vclose();
nathan@4: }
nathan@4: 
nathan@4: /****************************************************************************/
nathan@4: 
nathan@4: void VvirtRead(void *buf)
nathan@4: {
nathan@4:   if(full_read(vfd,buf,CD_FRAMESIZE)!=CD_FRAMESIZE)
nathan@4:     serror("Unexpected EOF reading data");
nathan@4: }
nathan@4: 
nathan@4: /****************************************************************************/
nathan@4: 
nathan@4: void VcloseTrack(int cont)
nathan@4: {
nathan@4:   if(virtual) {
nathan@4:     if(lseek64(fd,0,SEEK_SET)<0) error("Seek failed (close track)");
nathan@4:     virt_header->has_cont=cont;
nathan@4:     if(write(fd,virt_header,CD_FRAMESIZE)!=CD_FRAMESIZE) error("Write failed (close track)");
nathan@4:     Vclose();
nathan@4:     }
nathan@4:   else {
nathan@4:     Vclose();
nathan@4: #ifndef DEBUGOUT
nathan@4:     DEBUG("VcloseTrack: waiting for child termination\n");
nathan@4:     while(wait(0)!=childpid);
nathan@4: #endif
nathan@4:     }
nathan@4:   if(vfd>=0) { close(vfd); vfd=-1; }
nathan@4: }
nathan@4: 
nathan@4: /****************************************************************************/
nathan@4: 
nathan@4: void Vwrite(const void *buf)
nathan@4: {
nathan@4:   if(write(fd,buf,CD_FRAMESIZE)!=CD_FRAMESIZE) error("Write failed");
nathan@4:   if(virtual) virt_header->leadout++;
nathan@4:   cd_avail-=CD_FRAMESIZE;
nathan@4: }