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NFSCLNT(2)                                 BSD System Calls Manual                                NFSCLNT(2)

NAME
     nfsclnt -- NFS client services

SYNOPSIS
     #include <unistd.h>
     #include <nfs/nfs.h>

     int
     nfsclnt(int flags, void *argstructp);

DESCRIPTION
     The nfsclnt() function is used by the NFS client daemons to pass information into and out of the ker-nel. kernel.
     nel.  The flags argument consists of several bits that show what action is to be taken once in the ker-nel kernel
     nel and the argstructp points to any corresponding data that the action may require.

     rpc.lockd(8) calls nfsclnt() with the flag NFSCLNT_LOCKDANS and a pointer to a

     struct lockd_ans {
             int             la_version;             /* lockd_ans version */
             int             la_errno;               /* return status */
             u_int64_t       la_xid;                 /* unique message transaction ID */
             int             la_flags;               /* answer flags */
             pid_t           la_pid;                 /* pid of lock requester/owner */
             off_t           la_start;               /* lock starting offset */
             off_t           la_len;                 /* lock length */
             int             la_fh_len;              /* The file handle length. */
             u_int8_t        la_fh[NFSV3_MAX_FH_SIZE];/* The file handle. */
     };

     to pass the response to an NFS file locking request back into the kernel.

RETURN VALUES
     Upon successful completion, a value of 0 is returned.  Otherwise, -1 is returned and the global vari-able variable
     able errno is set to specify the error.

ERRORS
     [EPERM]            The caller is not the super-user.

     [EINVAL]           The action specified by the flags argument was not valid.

     [EFAULT]           argstructp points to an invalid address.

     [EPIPE]            The response doesn't match any currently-outstanding lock request.

SEE ALSO
     rpc.lockd(8)

BUGS
     The nfsclnt system call is designed specifically for the NFS client daemons and as such is specific to
     their requirements.  Several fields of the argument structures are assumed to be valid, such that
     nfsclnt must be used with extreme care.

BSD                                            January 9, 2007                                           BSD