fhstatfs(2) access file via file handle

Other Alias

fhopen, fhstat


Lb libc


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 *buf


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.


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


In addition to the errors returned by open(2), fstat(2), and fstatfs(2) respectively, Fn fhopen , Fn fhstat , and Fn fhstatfs will return

Calling Fn fhopen with O_CREAT set.
The file handle Fa fhp is no longer valid.


The Fn fhopen , Fn fhstat , and Fn fhstatfs system calls first appeared in Nx 1.5 and were adapted to Fx 4.0 by An Alfred Perlstein .


This manual page was written by An William Studenmund for Nx .