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FHOPEN(2)                     System Calls Manual                    FHOPEN(2)

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

     Standard C Library (libc, -lc)

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

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

     #include <sys/stat.h>

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

     #include <sys/statvfs.h>

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

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

     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 directory 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 specified 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.

     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.

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     [ESTALE]           The file handle fhp is no longer valid.

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

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

NetBSD 7.1.2                    August 5, 2009                    NetBSD 7.1.2