checking to see if a CD is in the drive Sender: Linux

You can do this with Perl or C. C is probably your best bet. Perl example only shows opening-closing.

#!-usr-bin-perl # read man ioctllist for hex codes # readusr-include-linux-cdrom.h for cd codes use Fcntl; sysopen my $f, "-dev-sr0", ORDONLYONONBLOCK or die "open $?"; ioctl $f, 0x5329, 0 or die "ioctl $!"; # 0 unlocks 1 locks door ioctl $f, 0x5309, 0 or die "ioctl $!"; # open tray ioctl $f, 0x5319, 0 or die "ioctl $!"; #close tray END

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* Begin C code. Put this in a file called cdstatus.c and do "gcc -o * cdstatus cdstatus.c" . No error checking, no looping, no * documentation, if it breaks, you get to keep both pieces. *

int main(int argc, char **argv) { char buff256; * ioctl() needs a 3rd arg but it doesn't really use it here. *int fd,status;

if(argc!=2){ exit(1); }

fd=open(argv1, ORDONLY ONONBLOCK);* need NONBLOCK! * snprintf(buff,64,"%s cannot be opened ",argv1); perror(buff); exit(1); } status=ioctl(fd,CDROMDRIVESTATUS,buff); close(fd);

switch(status){ case CDSNOINFO: printf("Whoa. Huh?-n"); break; case CDSNODISC: printf("No disc is in the drive.-n"); break; case CDSTRAYOPEN: printf("Tray is open, or tray is closed and no CD is present.-n"); break; case CDSDRIVENOTREADY: printf("Drive is not ready.-n"); break; case CDSDISCOK: printf("A disc is in the drive.-n"); break; default: printf("Um, we shouldn't be here!-n"); break; }

return 0; }

* end of C code *

-- I'm not really a human, but I play one on earth.