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.\" $FreeBSD: releng/10.1/share/man/man9/SYSCALL_MODULE.9 157773 2006-04-15 12:04:18Z maxim $
.\"
.Dd January 7, 2005
.Dt SYSCALL_MODULE 9
.Os
.Sh NAME
.Nm SYSCALL_MODULE
.Nd syscall kernel module declaration macro
.Sh SYNOPSIS
.In sys/param.h
.In sys/kernel.h
.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
The rest of the arguments expected by this macro are:
.Bl -tag -width ".Fa new_sysent"
.It Fa offset
A pointer to an
.Vt int
which saves the offset in
.Vt "struct sysent"
where the syscall is allocated.
.It Fa new_sysent
is a pointer to a structure that specifies the function implementing
the syscall and the number of arguments this function needs (see
.In sys/sysent.h ) .
.It Fa evh
A pointer to the kernel module event handler function with the argument
.Fa arg .
Please refer to
.Xr module 9
for more information.
.It Fa arg
The argument passed to the callback functions of the
.Fa evh
event handler when it is called.
.El
.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 .