freebsd man page for fhstatfs

FHOPEN(2)						      BSD 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 vari-
     able 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     [ESTALE]		The file handle fhp is no longer valid.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.

BSD
								   June 29, 1999							       BSD