Get File Descriptor from major and minor number

[ptb4866]

Hi, Is it possible to get a file descriptor from the major and minor number. If so, how can this be done? I am trying to see if a port(eg ttyS2) is opened without using the fdopen or open or fopen functions.

Or maybe the question I should be asking is, is there a way to get the file descriptor of file or port that as already been opened, without using the functions I mentioned above. These functions reopens the port. I am trying to avoid that.

[hazel]

Try the lsof command.

[ptb4866]

the lsof command is terminal based. Is there a way to do this in C code

[hazel]

Well, what about reading directory entries in /proc/PID/fdinfo? There's probably some function in libproc that does it more directly.