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NetBSD 6.1.5 - man page for fhopen (netbsd section 2)

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FHOPEN(2)			     BSD System Calls Manual				FHOPEN(2)

NAME
     fhopen, fhstat, fhstatvfs -- access file via file handle

LIBRARY
     Standard C Library (libc, -lc)

SYNOPSIS
     #include <sys/types.h>
     #include <sys/mount.h>

     int
     fhopen(const void *fhp, size_t fh_size, int flags);

     #include <sys/stat.h>

     int
     fhstat(const void *fhp, size_t fh_size, struct stat *sb);

     #include <sys/statvfs.h>

     int
     fhstatvfs(const void *fhp, size_t fh_size, struct statvfs *buf);

     int
     fhstatvfs1(const void *fhp, size_t fh_size, struct statvfs *buf, int flags);

DESCRIPTION
     These functions provide a means to access a file given the opaque file handle fhp and the
     size fh_size of the opaque object as returned by getfh(2).  As this method bypasses direc-
     tory access restrictions, these calls are restricted to the superuser.

     fhopen() 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 are speci-
     fied by or'ing together the flags used for the open(2) call.  All said flags are valid
     except for O_CREAT.

     fhstat(), fhstatvfs(), and fhstatvfs1() provide the functionality of the fstat(2),
     fstatvfs(2), and fstatvfs1(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, while
     fhstat(), fhstatvfs(), and fhstatvfs1() return 0.	Otherwise, -1 is returned and errno is
     set to indicate the error.

ERRORS
     In addition to the errors returned by open(2), fstat(2), fstatvfs(2), and fstatvfs1(2),
     respectively, fhopen(), fhstat(), fhstatvfs(), and fhstatvfs1() will return

     [EINVAL]		Calling fhopen() with O_CREAT set or invalid fh_size.

     [ESTALE]		The file handle fhp is no longer valid.

SEE ALSO
     fstat(2), fstatvfs(2), fstatvfs1(2), getfh(2), open(2)

HISTORY
     The fhopen(), and fhstat() functions first appeared in NetBSD 1.5.  The fhstatvfs() function
     replaced fhstatfs() in NetBSD 3.0.

BSD					  August 5, 2009				      BSD
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