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Dd April 20, 2025
Dt PROP_COPYIN_IOCTL 9
Os
Sh NAME
Nm prop_object_copyin ,
Nm prop_object_copyin_size ,
Nm prop_object_copyin_ioctl ,
Nm prop_object_copyin_ioctl_size ,
Nm prop_object_copyout ,
Nm prop_object_copyout_ioctl
Nd Copy property lists to and from kernel space
Sh SYNOPSIS
In prop/proplib.h
Ft int
Fn prop_object_copyin "const struct plistref *pref" \
"prop_object_t *arrayp"
Ft int
Fn prop_object_copyin_size "const struct plistref *pref" \
"prop_object_t *arrayp" "size_t lim"
Ft int
Fn prop_object_copyin_ioctl "const struct plistref *pref" \
"const u_long cmd" "prop_object_t *arrayp"
Ft int
Fn prop_object_copyin_ioctl_size "const struct plistref *pref" \
"const u_long cmd" "prop_object_t *arrayp" "size_t lim"
Ft int
Fn prop_object_copyout "struct plistref *pref" \
"prop_object_t array"
Ft int
Fn prop_object_copyout_ioctl "struct plistref *pref" \
"const u_long cmd" "prop_object_t array"
Sh DESCRIPTION
The
Nm prop_object_copyin_ioctl ,
Nm prop_object_copyin_ioctl_size ,
and
Nm prop_object_copyout_ioctl
functions implement the kernel side of a protocol for copying property lists
to and from the kernel using
Xr ioctl 2 .
The functions
Nm prop_object_copyin ,
Nm prop_object_copyin_size ,
and
Nm prop_object_copyout
implement the kernel side of a protocol for copying property lists to the
kernel as arguments of normal system calls.
Pp
A kernel routine receiving or returning a property list will be passed a
pointer to a
Vt struct plistref .
This structure encapsulates the reference to the property list in externalized
form.
Pp
The functions
Nm prop_object_copyin_size
and
Nm prop_object_copyin_ioctl_size
take an explicit size limit argument
Ar lim
while
Nm prop_object_copyin
and
Nm prop_object_copyin_ioctl
have an implicit size limit of 128KB.
Attempts to transfer objects larger than the limit result in an
Er E2BIG
return value.
Pp
The functions
Fn prop_array_copyin ,
Fn prop_array_copyin_size ,
Fn prop_array_copyin_ioctl ,
Fn prop_array_copyin_ioctl_size ,
Fn prop_dictionary_copyin ,
Fn prop_dictionary_copyin_size ,
Fn prop_dictionary_copyin_ioctl ,
and
Fn prop_dictionary_copyin_ioctl_size
are provided as wrappers around the corresponding generic object
functions.
They are provided for backwards compatibility and will fail if the
object copied in is not of the specified type, preserving the previous
behavior.
Pp
The functions
Fn prop_array_copyout ,
Fn prop_array_copyout_ioctl ,
Fn prop_dictionary_copyout ,
and
Fn prop_dictionary_copyout_ioctl
are also provided as backwards compatibility wrappers around the
corresponding generic object functions, but impose no object type
constraints.
Sh RETURN VALUES
If successful, functions return zero.
Otherwise, an error number will be returned to indicate the error.
Sh EXAMPLES
The following
Pq simplified
example demonstrates using
Fn prop_object_copyin_ioctl
and
Fn prop_object_copyout_ioctl
in an ioctl routine:
Bd -literal
extern prop_dictionary_t fooprops;
int
fooioctl(dev_t dev, u_long cmd, caddr_t data, int flag, struct lwp *l)
{
prop_dictionary_t dict, odict;
int error;
default:
return (EPASSTHROUGH);
}
return (error);
}
Ed
Pp
The following
Pq simplified
example demonstrates using
Fn prop_object_copyin
in a routine:
Bd -literal
int
foocopyin(const struct plistref *pref))
{
prop_array_t array;
int error;
error = prop_object_copyin(pref, (prop_object_t *)\*[Am]array);
if (error)
return (error);
...
}
Ed
Sh ERRORS
Fn prop_object_copyin_ioctl
will fail if:
Bl -tag -width Er
It Bq Er E2BIG
The object being copied is larger than an arbitrarily established limit
(currently set to 128Kbytes).
It Bq Er EFAULT
Bad address
It Bq Er EIO
Input/output error
It Bq Er ENOMEM
Cannot allocate memory
El
Pp
Fn prop_object_copyout_ioctl
will fail if:
Bl -tag -width Er
It Bq Er EFAULT
Bad address
It Bq Er ENOMEM
Cannot allocate memory
El
Sh SEE ALSO
Xr prop_array 3 ,
Xr prop_dictionary 3 ,
Xr prop_object 3 ,
Xr prop_send_ioctl 3 ,
Xr prop_send_syscall 3 ,
Xr proplib 3
Sh HISTORY
The
Nm proplib
property container object library first appeared in
Nx 4.0 .
