svn commit: r250223 - in head: lib/libprocstat sys/kern sys/sys usr.bin/fstat

[John Baldwin]

On Friday, May 03, 2013 5:11:57 pm John Baldwin wrote:
> Author: jhb
> Date: Fri May  3 21:11:57 2013
> New Revision: 250223
> URL: http://svnweb.freebsd.org/changeset/base/250223
> 
> Log:
>   Similar to 233760 and 236717, export some more useful info about the
>   kernel-based POSIX semaphore descriptors to userland via procstat(1) and
>   fstat(1):
>   - Change sem file descriptors to track the pathname they are associated
>     with and add a ksem_info() method to copy the path out to a
>     caller-supplied buffer.
>   - Use the fo_stat() method of shared memory objects and ksem_info() to
>     export the path, mode, and value of a semaphore via struct kinfo_file.
>   - Add a struct semstat to the libprocstat(3) interface along with a
>     procstat_get_sem_info() to export the mode and value of a semaphore.
>   - Teach fstat about semaphores and to display their path, mode, and value.
>   
>   MFC after:	2 weeks

I do realize that the POSIX semaphore API only uses these descriptors for 8.x 
and earlier, but this is still useful info if you are using 8.x (where I will
MFC this), or if you are using an 8.x world or chroot with a newer kernel.

-- 
John Baldwin