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FHOPEN(2) System Calls Manual FHOPEN(2)

fhopen, fhstat, fhstatfs
access file via file handle

#include <sys/types.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);

These functions 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.

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() and fhstatfs() 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.

Upon successful completion, fhopen() returns the file descriptor for the opened file, while fhstat() and fhstatfs() 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), and fstatfs(2) respectively, fhopen(), fhstat(), and fhstatfs() will return
[]
Calling fhopen() with O_CREAT set.
[]
The file handle fhp is no longer valid.

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

The fhopen(), fhstat(), and fhstatfs() functions first appeared in NetBSD 1.5.
September 10, 2015 OpenBSD-current