fhstat (2)

Leading comments

	$NetBSD: fhopen.2,v 1.1 1999/06/30 01:32:15 wrstuden Exp $

 Copyright (c) 1999 National Aeronautics & Space Administration
 All rights reserved.

 This software was written by William Studenmund of the
 Numerical Aerospace Simulation Facility, NASA Ames Research Center.

 Redistribution and use in source and binary forms, with or without
 modification, are permitted provided that the following conditions
 are met:
 1. Redistributions of source code must retain the above copyright
    notice...

(The comments found at the beginning of the groff file "man2/fhstat.2freebsd".)

NAME

fhopen fhstat fhstatfs - access file via file handle

LIBRARY

Lb libc

SYNOPSIS

In sys/param.h In sys/mount.h In sys/stat.h Ft int Fn fhopen const fhandle_t *fhp int flags Ft int Fn fhstat const fhandle_t *fhp struct stat *sb Ft int Fn fhstatfs const fhandle_t *fhp struct statfs *buf

DESCRIPTION

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

The Fn fhopen system call opens the file referenced by Fa fhp for reading and/or writing as specified by the argument Fa flags and returns the file descriptor to the calling process. The Fa 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 Fn fhstat and Fn 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 Fa fhp rather than an open file.

RETURN VALUES

Upon successful completion, Fn 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.

Rv -std fhstat fhstatfs

ERRORS

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

Bq Er EINVAL

Calling Fn fhopen with O_CREAT set.

Bq Er ESTALE

The file handle Fa fhp is no longer valid.

SEE ALSO

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

HISTORY

The Fn fhopen , Fn fhstat , and Fn fhstatfs system calls first appeared in Nx 1.5 and were adapted to Fx 4.0 by An Alfred Perlstein .

AUTHORS

This manual page was written by An William Studenmund for Nx .