difference between fget(fd) and current->files->fd[fd]

appas · 08-09-2004, 08:16 AM

Can anyone please tell me the difference between
fget(filedesriptor) and current->files->fd[filedescriptor].
Does both return the same file pointer.

itsme86 · 08-09-2004, 08:46 AM

I have no idea what fget() is, but it isn't a standard function. What's it supposed do (on your system)?

appas · 08-09-2004, 08:54 AM

Yes, it is not a part of libc function. fget is part of system function.
I am writing a kernel module and want to get information about a file reference count using the filedescriptor.I thought about getting the pointer to 'struct file' structure and there on i can get the other details about the file.

infamous41md · 08-09-2004, 10:46 AM

well look at the code! fget() makes sure the fd is within the limit of max_open files, and if the process actually has that descriptor open. if it does, the reference count is incremented and the file structure is returned.