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fhopen(2) [freebsd man page]

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 [ESTALE] The file handle fhp is no longer valid.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

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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 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. 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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