minix/common/lib/libprop/prop_send_syscall.3
2011-12-22 18:03:13 +01:00

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.\" $NetBSD: prop_send_syscall.3,v 1.5 2011/09/30 22:08:18 jym Exp $
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.\" Copyright (c) 2006 The NetBSD Foundation, Inc.
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.\" This code is derived from software contributed to The NetBSD Foundation
.\" by Jason R. Thorpe.
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.Dd January 17, 2011
.Dt PROP_SEND_SYCALL 3
.Os
.Sh NAME
.Nm prop_array_send_syscall ,
.Nm prop_array_recv_syscall ,
.Nm prop_dictionary_send_syscall ,
.Nm prop_dictionary_recv_syscall
.Nd send and receive property lists to and from the kernel using syscalls
.Sh SYNOPSIS
.In prop/proplib.h
.Ft int
.Fn prop_array_send_syscall "prop_array_t array" "struct plistref *prefp"
.Ft int
.Fn prop_array_recv_syscall "const struct plistref *prefp" \
"prop_array_t *arrayp"
.Ft int
.Fn prop_dictionary_send_syscall "prop_dictionary_t dict" \
"struct plistref *prefp"
.Ft int
.Fn prop_dictionary_recv_syscall "const struct plistref *prefp" \
"prop_dictionary_t *dictp"
.Sh DESCRIPTION
The
.Nm prop_array_send_syscall ,
.Nm prop_array_recv_syscall ,
.Nm prop_dictionary_send_syscall ,
and
.Nm prop_dictionary_recv_syscall
functions implement the user space side of a protocol for sending property
lists to and from the kernel using
.Xr syscall 2 .
.Sh RETURN VALUES
If successful, functions return zero.
Otherwise, an error number is returned to indicate the error.
.Sh EXAMPLES
The following
.Pq simplified
example demonstrates using
.Fn prop_dictionary_send_syscall
and
.Fn prop_dictionary_recv_syscall
in an application:
.Bd -literal
void
foo_setprops(prop_dictionary_t dict)
{
struct pref pref;
(void) prop_dictionary_send_syscall(dict, \*[Am]pref);
(void) my_syscall_set(\*[Am]pref);
}
prop_dictionary_t
foo_getprops(void)
{
prop_dictionary_t dict;
struct pref pref;
(void) my_syscall_get(\*[Am]pref);
if (prop_dictionary_recv_syscall(\*[Am]pref, \*[Am]dict) != 0)
return (NULL);
return (dict);
}
.Ed
.Sh ERRORS
.Fn prop_array_send_syscall
and
.Fn prop_dictionary_send_syscall
will fail if:
.Bl -tag -width Er
.It Bq Er ENOMEM
Cannot allocate memory
.It Bq Er ENOTSUP
Not supported
.El
.Pp
.Fn prop_array_recv_syscall
and
.Fn prop_dictionary_recv_syscall
will fail if:
.Bl -tag -width Er
.It Bq Er EIO
Input/output error
.It Bq Er ENOTSUP
Not supported
.El
.Sh SEE ALSO
.Xr prop_array 3 ,
.Xr prop_dictionary 3 ,
.Xr proplib 3 ,
.Xr prop_copyin_ioctl 9
.Sh HISTORY
The
.Nm proplib
property container object library first appeared in
.Nx 4.0 .