$ strace eject
[...]
stat64("/dev/hdc", {st_mode=S_IFBLK|0660, st_rdev=makedev(22, 0), ...}) = 0
close(3)                                = 0
munmap(0xb7f77000, 4096)                = 0
stat64("/dev/hdc", {st_mode=S_IFBLK|0660, st_rdev=makedev(22, 0), ...}) = 0
clone(child_stack=0, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=0xb7e27928) = 3777
wait4(-1, [{WIFEXITED(s) && WEXITSTATUS(s) == 0}], 0, NULL) = 3777
--- SIGCHLD (Child exited) @ 0 (0) ---
open("/etc/mtab", O_RDONLY)             = 3
fstat64(3, {st_mode=S_IFREG|0644, st_size=674, ...}) = 0
mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0xb7f77000
read(3, "/dev/sda2 / auto rw 0 0\nproc /pr"..., 4096) = 674
read(3, "", 4096)                       = 0
close(3)                                = 0
munmap(0xb7f77000, 4096)                = 0
open("/dev/hdc", O_RDONLY|O_NONBLOCK)   = 3
ioctl(3, CDROMEJECT, 0x804d8b0)         = -1 EIO (Input/output error)
ioctl(3, SG_GET_VERSION_NUM, 0xbfc8c150) = 0
ioctl(3, SG_IO, 0xbfc8c0c4)             = -1 EPERM (Operation not permitted)
ioctl(3, FDEJECT, 0x804d8b0)            = -1 EINVAL (Invalid argument)
ioctl(3, MGSL_IOCGPARAMS or MTIOCTOP or SNDCTL_MIDI_MPUMODE, 0xbfc8c124) = -1 EINVAL (Invalid argument)
write(2, "eject: unable to eject, last err"..., 53eject: unable to eject, last error: Invalid argument
) = 53
exit_group(1)                           = ?
Process 3776 detached