diff options
Diffstat (limited to 'share/examples/modules')
| -rw-r--r-- | share/examples/modules/Makefile | 8 | ||||
| -rw-r--r-- | share/examples/modules/skel.c | 86 |
2 files changed, 94 insertions, 0 deletions
diff --git a/share/examples/modules/Makefile b/share/examples/modules/Makefile new file mode 100644 index 000000000000..4ed5e5354c79 --- /dev/null +++ b/share/examples/modules/Makefile @@ -0,0 +1,8 @@ +.PATH: ${SRCTOP}/sys/skel + +KMOD= skel +SRCS= skel.c + +.include <bsd.kmod.mk> + +CFLAGS+= -DKDTRACE_HOOKS diff --git a/share/examples/modules/skel.c b/share/examples/modules/skel.c new file mode 100644 index 000000000000..3c2cbd8eb8b1 --- /dev/null +++ b/share/examples/modules/skel.c @@ -0,0 +1,86 @@ +/*- + * SPDX-License-Identifier: BSD-2-Clause + * + * Copyright (c) 2023 George V. Neville-Neil + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + * + */ + +/* + * SKEL Loadable Kernel Module for the FreeBSD Operating System + * + * The SKEL module is meant to act as a skeleton for creating new + * kernel modules. + * + * This module can be loaded and unloaded from * FreeBSD and is for + * use in teaching as well. + * + */ + +#include <sys/param.h> +#include <sys/kernel.h> +#include <sys/systm.h> +#include <sys/module.h> + +/* + * Every module can have a module specific piece of code that is + * executed whenever the module is loaded or unloaded. The following + * is a trivial example that prints a message on the console whenever + * the module is loaded or unloaded. + */ + +static int +skel_mod_event(module_t mod, int type, void *data) +{ + + switch (type) { + case MOD_LOAD: + printf("SKEL module loading.\n"); + return (0); + case MOD_UNLOAD: + printf("SKEL module unloading.\n"); + return (0); + } + return (EOPNOTSUPP); +} + +/* + * Modules can have associated data and the module data also contains + * an entry for the function called by the kernel on load and unload. + */ + +static moduledata_t skel_mod = { + "skel", + skel_mod_event, + NULL, +}; + +/* + * Each module is declared with its name and module data. The + * ordering arguments at the end put this module into the device + * driver class, which is sufficient for our needs. The complete list + * of modules types and ording can be found in sys/kernel.h + */ + +DECLARE_MODULE(skel, skel_mod, SI_SUB_DRIVERS, SI_ORDER_MIDDLE); + |