mirror of
https://git.FreeBSD.org/src.git
synced 2024-12-01 08:27:59 +00:00
8269e7673c
Remove core system call implementations and documentation to lib/libsys and lib/libsys/<arch> from lib/libc/sys and lib/libc/<arch>/<sys>. Update paths to allow libc to find them in their new home. Reviewed by: kib, emaste, imp Pull Request: https://github.com/freebsd/freebsd-src/pull/908
232 lines
5.3 KiB
Groff
232 lines
5.3 KiB
Groff
.\" Copyright (c) 1989, 1991, 1993
|
|
.\" The Regents of the University of California. All rights reserved.
|
|
.\" Copyright (c) 2018 Gandi
|
|
.\"
|
|
.\" Redistribution and use in source and binary forms, with or without
|
|
.\" modification, are permitted provided that the following conditions
|
|
.\" are met:
|
|
.\" 1. Redistributions of source code must retain the above copyright
|
|
.\" notice, this list of conditions and the following disclaimer.
|
|
.\" 2. Redistributions in binary form must reproduce the above copyright
|
|
.\" notice, this list of conditions and the following disclaimer in the
|
|
.\" documentation and/or other materials provided with the distribution.
|
|
.\" 3. Neither the name of the University nor the names of its contributors
|
|
.\" may be used to endorse or promote products derived from this software
|
|
.\" without specific prior written permission.
|
|
.\"
|
|
.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
|
|
.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
|
.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
.\" SUCH DAMAGE.
|
|
.\"
|
|
.Dd November 30, 2022
|
|
.Dt GETFH 2
|
|
.Os
|
|
.Sh NAME
|
|
.Nm getfh ,
|
|
.Nm lgetfh ,
|
|
.Nm getfhat
|
|
.Nd get file handle
|
|
.Sh LIBRARY
|
|
.Lb libc
|
|
.Sh SYNOPSIS
|
|
.In sys/param.h
|
|
.In sys/mount.h
|
|
.Ft int
|
|
.Fn getfh "const char *path" "fhandle_t *fhp"
|
|
.Ft int
|
|
.Fn lgetfh "const char *path" "fhandle_t *fhp"
|
|
.Ft int
|
|
.Fn getfhat "int fd" "const char *path" "fhandle_t *fhp" "int flag"
|
|
.Sh DESCRIPTION
|
|
The
|
|
.Fn getfh
|
|
system call
|
|
returns a file handle for the specified file or directory
|
|
in the file handle pointed to by
|
|
.Fa fhp .
|
|
.Pp
|
|
The
|
|
.Fn lgetfh
|
|
system call is like
|
|
.Fn getfh
|
|
except in the case where the named file is a symbolic link,
|
|
in which case
|
|
.Fn lgetfh
|
|
returns information about the link,
|
|
while
|
|
.Fn getfh
|
|
returns information about the file the link references.
|
|
.Pp
|
|
The
|
|
.Fn getfhat
|
|
system call is equivalent to
|
|
.Fn getfh
|
|
and
|
|
.Fn lgetfh
|
|
except when the
|
|
.Fa path
|
|
specifies a relative path.
|
|
For
|
|
.Fn getfhat
|
|
and relative
|
|
.Fa path ,
|
|
the status is retrieved from a file relative to
|
|
the directory associated with the file descriptor
|
|
.Fa fd
|
|
instead of the current working directory.
|
|
.Pp
|
|
The values for the
|
|
.Fa flag
|
|
are constructed by a bitwise-inclusive OR of flags from this list,
|
|
defined in
|
|
.In fcntl.h :
|
|
.Bl -tag -width indent
|
|
.It Dv AT_SYMLINK_NOFOLLOW
|
|
If
|
|
.Fa path
|
|
names a symbolic link, the status of the symbolic link is returned.
|
|
.It Dv AT_RESOLVE_BENEATH
|
|
Only walk paths below the directory specified by the
|
|
.Ar fd
|
|
descriptor.
|
|
See the description of the
|
|
.Dv O_RESOLVE_BENEATH
|
|
flag in the
|
|
.Xr open 2
|
|
manual page.
|
|
.El
|
|
.Pp
|
|
If
|
|
.Fn getfhat
|
|
is passed the special value
|
|
.Dv AT_FDCWD
|
|
in the
|
|
.Fa fd
|
|
parameter, the current working directory is used and the behavior is
|
|
identical to a call to
|
|
.Fn getfth
|
|
or
|
|
.Fn lgetfh
|
|
respectively, depending on whether or not the
|
|
.Dv AT_SYMLINK_NOFOLLOW
|
|
bit is set in
|
|
.Fa flag .
|
|
.Pp
|
|
When
|
|
.Fn getfhat
|
|
is called with an absolute
|
|
.Fa path ,
|
|
it ignores the
|
|
.Fa fd
|
|
argument.
|
|
.Pp
|
|
These system calls are restricted to the superuser.
|
|
.Sh RETURN VALUES
|
|
.Rv -std
|
|
.Sh ERRORS
|
|
The
|
|
.Fn getfh
|
|
and
|
|
.Fn lgetfh
|
|
system calls
|
|
fail if one or more of the following are true:
|
|
.Bl -tag -width Er
|
|
.It Bq Er EPERM
|
|
The caller does not have appropriate privilege to perform the operation.
|
|
.It Bq Er ENOTDIR
|
|
A component of the path prefix of
|
|
.Fa path
|
|
is not a directory.
|
|
.It Bq Er ENAMETOOLONG
|
|
The length of a component of
|
|
.Fa path
|
|
exceeds 255 characters,
|
|
or the length of
|
|
.Fa path
|
|
exceeds 1023 characters.
|
|
.It Bq Er ENOENT
|
|
The file referred to by
|
|
.Fa path
|
|
does not exist.
|
|
.It Bq Er EACCES
|
|
Search permission is denied for a component of the path prefix of
|
|
.Fa path .
|
|
.It Bq Er ELOOP
|
|
Too many symbolic links were encountered in translating
|
|
.Fa path .
|
|
.It Bq Er EFAULT
|
|
The
|
|
.Fa fhp
|
|
argument
|
|
points to an invalid address.
|
|
.It Bq Er EFAULT
|
|
The
|
|
.Fa path
|
|
argument
|
|
points to an invalid address.
|
|
.It Bq Er EIO
|
|
An
|
|
.Tn I/O
|
|
error occurred while reading from or writing to the file system.
|
|
.It Bq Er EINTEGRITY
|
|
Corrupted data was detected while reading from the file system.
|
|
.It Bq Er ESTALE
|
|
The file handle
|
|
.Fa fhp
|
|
is no longer valid.
|
|
.El
|
|
.Pp
|
|
In addition to the errors returned by
|
|
.Fn getfh ,
|
|
and
|
|
.Fn lgetfh ,
|
|
the
|
|
.Fn getfhat
|
|
system call may fail if:
|
|
.Bl -tag -width Er
|
|
.It Bq Er EBADF
|
|
The
|
|
.Fa path
|
|
argument does not specify an absolute path and the
|
|
.Fa fd
|
|
argument, is neither
|
|
.Dv AT_FDCWD
|
|
nor a valid file descriptor open for searching.
|
|
.It Bq Er EINVAL
|
|
The value of the
|
|
.Fa flag
|
|
argument is not valid.
|
|
.It Bq Er ENOTDIR
|
|
The
|
|
.Fa path
|
|
argument is not an absolute path and
|
|
.Fa fd
|
|
is neither
|
|
.Dv AT_FDCWD
|
|
nor a file descriptor associated with a directory.
|
|
.Sh SEE ALSO
|
|
.Xr fhopen 2 ,
|
|
.Xr open 2 ,
|
|
.Xr stat 2
|
|
.Sh HISTORY
|
|
The
|
|
.Fn getfh
|
|
system call first appeared in
|
|
.Bx 4.4 .
|
|
The
|
|
.Fn lgetfh
|
|
system call first appeared in
|
|
.Fx 5.3 .
|
|
The
|
|
.Fn getfhat
|
|
system call first appeared in
|
|
.Fx 12.1 .
|