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 re

turns 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 func

tionality of the
fstat(2) and fstatfs(2) calls except that they return infor

mation for the
file referred to by fhp rather than an open file.

RETURN VALUES

Upon successful completion, fhopen() returns the file de

scriptor for the
opened file; otherwise the value -1 is returned and the

global variable
errno is set to indicate the error.

The fhstat() function returns 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[ESTALE] The file handle fhp is no longer valid.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 Perl

stein.

AUTHORS

This manual page was written by William Studenmund for NetB

SD.

BSD June 29, 1999

BSD