~$ lsof /dev/sound
lsof: status error on /dev/sound: No such file or directory
lsof 4.77
 latest revision: ftp://lsof.itap.purdue.edu/pub/tools/unix/lsof/
 latest FAQ: ftp://lsof.itap.purdue.edu/pub/tools/unix/lsof/FAQ
 latest man page: ftp://lsof.itap.purdue.edu/pub/tools/unix/lsof/lsof_man
 usage: [-?abhlnNoOPRstUvVX] [+|-c c] [+|-d s] [+D D] [+|-f]
 [-F [f]] [-g [s]] [-i [i]] [+|-L [l]] [+m [m]] [+|-M] [-o [o]]
 [-p s] [+|-r [t]] [-S [t]] [-T [t]] [-u s] [+|-w] [-x [fl]] [--] [names]
Use the ``-h'' option to get more help information.
wayne@hal9000:~$ lsof /dev/snd/*
COMMAND    PID  USER   FD   TYPE DEVICE SIZE NODE NAME
firefox-b 5117 wayne  mem    CHR  116,8      7845 /dev/snd/pcmC0D0p
firefox-b 5117 wayne   80u   CHR  116,8      7845 /dev/snd/pcmC0D0p
firefox-b 5117 wayne   81r   CHR  116,2      7764 /dev/snd/timer
firefox-b 6877 wayne  mem    CHR  116,8      7845 /dev/snd/pcmC0D0p
firefox-b 6877 wayne   80u   CHR  116,8      7845 /dev/snd/pcmC0D0p