SYSCALL_MODULE (9)

Leading comments

Copyright (c) 2001 Alexander Langer

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(The comments found at the beginning of the groff file "man9/SYSCALL_MODULE.9freebsd".)

NAME

SYSCALL_MODULE - syscall kernel module declaration macro

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

DESCRIPTION

The Fn SYSCALL_MODULE macro declares a new syscall. Fn SYSCALL_MODULE expands into a kernel module declaration named as Fa name .

The rest of the arguments expected by this macro are:

Fa offset

A pointer to an Vt int which saves the offset in Vt struct sysent where the syscall is allocated.

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 ) .

Fa evh

A pointer to the kernel module event handler function with the argument Fa arg . Please refer to module(9) for more information.

Fa arg

The argument passed to the callback functions of the Fa evh event handler when it is called.

EXAMPLES

A minimal example for a syscall module can be found in /usr/share/examples/kld/syscall/module/syscall.c

SEE ALSO

module(9)

/usr/share/examples/kld/syscall/module/syscall.c

AUTHORS

This manual page was written by An Alexander Langer Aq alex@FreeBSD.org .