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FHOPEN(2)		      System Calls Manual		     FHOPEN(2)

NAME
       fhopen, fhstat, fhstatfs	-- access file via file	handle

LIBRARY
       Standard	C Library (libc, -lc)

SYNOPSIS
       #include	<sys/param.h>
       #include	<sys/mount.h>
       #include	<sys/stat.h>

       int
       fhopen(const fhandle_t *fhp, int	flags);

       int
       fhstat(const fhandle_t *fhp, struct stat	*sb);

       int
       fhstatfs(const fhandle_t	*fhp, struct statfs *buf);

DESCRIPTION
       These system calls provide a means to access a file given the file han-
       dle  fhp.  As this method bypasses directory access restrictions, these
       calls are restricted to the superuser.

       The fhopen() system call	opens the file referenced by fhp  for  reading
       and/or  writing as specified by the argument flags and returns the file
       descriptor to the calling process.  The flags argument is specified  by
       or'ing  together	 the flags used	for the	open(2)	system call.  All said
       flags are valid except for O_CREAT.

       The fhstat() and	fhstatfs() system calls	provide	the  functionality  of
       the  fstat(2)  and fstatfs(2) calls except that they return information
       for the file referred to	by fhp rather than an open file.

RETURN VALUES
       Upon successful completion, fhopen() returns the	 file  descriptor  for
       the  opened  file;  otherwise  the  value -1 is returned	and the	global
       variable	errno is set to	indicate the error.

       The fhstat() and	fhstatfs() functions return the	value 0	if successful;
       otherwise the value -1 is returned and the global variable errno	is set
       to indicate the error.

ERRORS
       In addition to the errors returned by open(2), fstat(2),	and fstatfs(2)
       respectively, fhopen(), fhstat(), and fhstatfs()	will return

       [EINVAL]		  Calling fhopen() with	O_CREAT	set.

       [ESTALE]		  The file handle fhp is no longer valid.

SEE ALSO
       fstat(2), fstatfs(2), getfh(2), open(2)

HISTORY
       The fhopen(), fhstat(), and fhstatfs() system calls first  appeared  in
       NetBSD 1.5 and were adapted to FreeBSD 4.0 by Alfred Perlstein.

AUTHORS
       This manual page	was written by William Studenmund for NetBSD.

FreeBSD	13.2			 June 29, 1999			     FHOPEN(2)
NAME | LIBRARY | SYNOPSIS | DESCRIPTION | RETURN VALUES | ERRORS | SEE ALSO | HISTORY | AUTHORS

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