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FHOPEN(2)		  FreeBSD 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	handle
     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     [ESTALE]		The file handle	fhp is no longer valid.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	10.1			 June 29, 1999			  FreeBSD 10.1

NAME | LIBRARY | SYNOPSIS | DESCRIPTION | RETURN VALUES | ERRORS | SEE ALSO | HISTORY | AUTHORS

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