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.\" Copyright (c) 2001 Alexander Langer
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.\" $FreeBSD: src/share/man/man9/SYSCALL_MODULE.9,v 1.2.2.2 2001/12/17 11:30:18 ru Exp $
.\" $DragonFly: src/share/man/man9/SYSCALL_MODULE.9,v 1.2 2003/06/17 04:37:01 dillon Exp $
.\"
.Dd April 27, 2001
.Dt SYSCALL_MODULE 9
.Os
.Sh NAME
.Nm SYSCALL_MODULE
.Nd syscall kernel module declaration macro
.Sh SYNOPSIS
.In sys/proc.h
.In sys/module.h
.In sys/sysent.h
.Fn SYSCALL_MODULE name "int *offset" "struct sysent new_sysent" "modeventhand_t evh" "void *arg"
.Sh DESCRIPTION
The
.Fn SYSCALL_MODULE
macro declares a new syscall.
.Fn SYSCALL_MODULE
expands into a kernel module declaration named as
.Fa name .
.Pp
.Fa offset
is a pointer to an
.Vt int
which saves the offset in
.Vt "struct sysent"
where the
syscall is allocated.
.Pp
.Fa new_sysent
specifies the function implementing the syscall and the number of
arguments this function needs (see
.Aq Pa sys/sysent.h ) .
.Pp
.Fa evh
is a pointer to the kernel module event handler function with the argument
.Fa arg .
Please refer to
.Xr module 9
for more information.
.Sh EXAMPLES
A minimal example for a syscall module can be found in
.Pa /usr/share/examples/kld/syscall/module/syscall.c .
.Sh SEE ALSO
.Xr module 9
.Pp
.Pa /usr/share/examples/kld/syscall/module/syscall.c
.Sh AUTHORS
This manual page was written by
.An Alexander Langer Aq alex@FreeBSD.org .