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Full Discussion: using stat() on an NFS mount
Top Forums Programming using stat() on an NFS mount Post 302255106 by Perderabo on Wednesday 5th of November 2008 10:37:14 PM
Old 11-05-2008
Why do you care? If you hang you should jump for joy. After all, that is the behavior you requested when you mount an NFS filesystem with both the hard and nointr options. If you want different behavior, maybe you should just select the options you actually want.

It is possible to check to get a fairly good idea that an NFS operation should succeed. But this introduces a race condition. You check and see that all is cool. Then the server crashes. Then you try your NFS operation and hang. This is why this approach will never work 100%.

If you really want to go this route, you can use an rpc call to contact the NFS server to inquire of it's health. Calling procedure 0 is a common way to do this. Procedure 0 always succeeds and just exits to prove that the server is alive. The rpcinfo can do this. You can either invoke that program or download the source code from opensolaris to see how to do it.

But I would just set the intr option.
 

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LEARN ABOUT FREEBSD

showmount

SHOWMOUNT(8)						    BSD System Manager's Manual 					      SHOWMOUNT(8)

NAME

     showmount -- show remote nfs mounts on host

SYNOPSIS

     showmount [-a | -d] [-e] [-1] [-3] [host]

DESCRIPTION

     The showmount utility shows status information about the NFS server on host.  By default it prints the names of all hosts that have NFS file
     systems mounted on the host.  See NFS: Network File System Protocol Specification, RFC 1094, Appendix A, and NFS: Network File System Version
     3 Protocol Specification, Appendix I, for a detailed description of the protocol.

     The following options are available:

     -a      List all mount points in the form:
		   host:dirpath.

     -d      List directory paths of mount points instead of hosts.

     -e      Show the host's exports list.

     -1      Use mount protocol Version 1, compatible with legacy servers.

     -3      Ignored for backwards compatibility.

SEE ALSO

     mount(8), mount_nfs(8), mountd(8)

HISTORY

     The showmount utility first appeared in 4.4BSD.

BUGS

     The mount daemon running on the server only has an idea of the actual mounts, since the NFS server is stateless.  The showmount utility will
     only display the information as accurately as the mount daemon reports it.

BSD
								  August 16, 2014							       BSD
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