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author | Doug Rabson <dfr@FreeBSD.org> | 1999-01-09 14:15:41 +0000 |
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committer | Doug Rabson <dfr@FreeBSD.org> | 1999-01-09 14:15:41 +0000 |
commit | 4c3df79450b7cb7a249bec83119c764358418ec0 (patch) | |
tree | cb85f51c4095435db42d61b468a0dc7996626ba4 /sys/kern/kern_syscalls.c | |
parent | b9c576c894df21883dbb5fa81162c4a2898e4dae (diff) | |
download | src-4c3df79450b7cb7a249bec83119c764358418ec0.tar.gz src-4c3df79450b7cb7a249bec83119c764358418ec0.zip |
Implement support for adding syscalls in KLD modules.
Submitted by: Assar Westerlund <assar@sics.se>
Notes
Notes:
svn path=/head/; revision=42433
Diffstat (limited to 'sys/kern/kern_syscalls.c')
-rw-r--r-- | sys/kern/kern_syscalls.c | 94 |
1 files changed, 94 insertions, 0 deletions
diff --git a/sys/kern/kern_syscalls.c b/sys/kern/kern_syscalls.c new file mode 100644 index 000000000000..e8dc83b3cc91 --- /dev/null +++ b/sys/kern/kern_syscalls.c @@ -0,0 +1,94 @@ +/*- + * Copyright (c) 1999 Assar Westerlund + * All rights reserved. + * + * 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. + * + * $Id: kern_syscalls.c,v 1.1 1999/01/03 06:00:55 root Exp root $ + */ + +#include <sys/param.h> +#include <sys/kernel.h> +#include <sys/systm.h> +#include <sys/malloc.h> +#include <sys/sysproto.h> +#include <sys/sysent.h> +#include <sys/syscall.h> +#include <sys/module.h> +#include <sys/linker.h> +#include <sys/proc.h> + +int +syscall_register(int *offset, struct sysent *new_sysent, + struct sysent *old_sysent) +{ + if (*offset == NO_SYSCALL) { + int i; + + for (i = 1; i < SYS_MAXSYSCALL; ++i) + if (sysent[i].sy_call == (sy_call_t *)lkmnosys) + break; + if (i == SYS_MAXSYSCALL) + return ENFILE; + *offset = i; + } else if (*offset < 0 || *offset >= SYS_MAXSYSCALL) + return EINVAL; + else if (sysent[*offset].sy_call != (sy_call_t *)lkmnosys) + return EEXIST; + + *old_sysent = sysent[*offset]; + sysent[*offset] = *new_sysent; + return 0; +} + +int +syscall_deregister(int *offset, struct sysent *old_sysent) +{ + if (*offset) + sysent[*offset] = *old_sysent; + return 0; +} + +int +syscall_module_handler(struct module *mod, int what, void *arg) +{ + struct syscall_module_data *data = (struct syscall_module_data*)arg; + int error; + + switch (what) { + case MOD_LOAD : + error = syscall_register(data->offset, data->new_sysent, + &data->old_sysent); + if (error) + return error; + break; + case MOD_UNLOAD : + error = syscall_deregister(data->offset, &data->old_sysent); + if (error) + return error; + break; + } + if (data->chainevh) + return data->chainevh(mod, what, data->chainarg); + else + return 0; +} |