123 lines
3.7 KiB
Groff
123 lines
3.7 KiB
Groff
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.\" $NetBSD: getfh.2,v 1.21 2006/10/30 18:53:42 mjf Exp $
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.\"
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.\" Copyright (c) 1989, 1991, 1993
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.\" The Regents of the University of California. All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" @(#)getfh.2 8.1 (Berkeley) 6/9/93
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.\"
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.Dd October 30, 2006
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.Dt GETFH 2
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.Os
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.Sh NAME
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.Nm getfh
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.Nd get file handle
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.Sh LIBRARY
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.Lb libc
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.Sh SYNOPSIS
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.In sys/types.h
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.In sys/mount.h
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.Ft int
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.Fn getfh "const char *path" "void *fhp" "size_t *fh_size"
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.Sh DESCRIPTION
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.Fn getfh
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returns a file handle for the specified file or directory
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in the file handle pointed to by
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.Fa fhp .
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The variable pointed to by
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.Fa fh_size
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has to be initialized to the memory allocated for the variable sized file
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handle.
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On return the value will be replaced by the actual size
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needed (which will vary depending on the file system the path is on).
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This system call is restricted to the superuser.
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To query the necessary size for the filehandle, a
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.Dv NULL
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pointer may
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be passed as
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.Fa fhp ,
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and the value pointed to by
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.Fa fh_size
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should be initialized to zero.
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.Sh RETURN VALUES
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Upon successful completion, a value of 0 is returned.
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Otherwise, \-1 is returned and the global variable
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.Va errno
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is set to indicate the error.
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.Sh ERRORS
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.Fn getfh
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fails if one or more of the following are true:
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.Bl -tag -width Er
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.It Bq Er ENOTDIR
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A component of the path prefix of
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.Fa path
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is not a directory.
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.It Bq Er ENAMETOOLONG
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The length of a component of
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.Fa path
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exceeds
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.Brq Dv NAME_MAX
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characters, or the length of
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.Fa path
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exceeds
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.Brq Dv PATH_MAX
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characters.
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.It Bq Er ENOENT
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The file referred to by
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.Fa path
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does not exist.
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.It Bq Er EACCES
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Search permission is denied for a component of the path prefix of
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.Fa path .
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.It Bq Er ELOOP
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Too many symbolic links were encountered in translating
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.Fa path .
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.It Bq Er EFAULT
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.Fa fhp
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points to an invalid address.
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.It Bq Er EIO
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An
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.Tn I/O
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error occurred while reading from or writing to the file system.
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.It Bq Er E2BIG
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The memory allocated for the file handle is too small.
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The size needed has been written to the variable pointed to by
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.Fa fh_size .
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.It Bq Er ENOMEM
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The kernel failed to allocate temporary memory to create a filehandle of the
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requested size.
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.El
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.Sh SEE ALSO
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.Xr fhstat 2 ,
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.Xr fhstatvfs 2 ,
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.Xr fhstatvfs1 2
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.Sh HISTORY
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The
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.Fn getfh
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function
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first appeared in
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.Bx 4.4 .
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