fhopen (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...
NAME
fhopen fhstat fhstatfs - access file via file handleLIBRARY
Lb libcSYNOPSIS
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 *bufDESCRIPTION
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- The file handle Fa fhp is no longer valid.