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/*
* Copyright (c) 2025 Ian Marco Moffett and L5 engineers
* 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.
* 3. Neither the name of the project nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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 COPYRIGHT OWNER 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.
*/
#include <sys/errno.h>
#include <sys/signal.h>
#include <sys/cdefs.h>
#include <sys/proc.h>
#include <os/signal.h>
/*
* Handle a POSIX sigaction
*/
static int
do_sigaction(int sig, const struct sigaction *act, struct sigaction *oact)
{
struct proc *self;
if (act == NULL || oact == NULL) {
return -EINVAL;
}
if ((self = proc_self()) == NULL) {
return -ESRCH;
}
/* Don't overflow the signal table */
if (sig >= NELEM(self->sigtab) || sig < 0) {
return -EINVAL;
}
if (oact != NULL) {
*oact = self->sigtab[sig];
}
if (act != NULL) {
self->sigtab[sig] = *act;
}
return 0;
}
/*
* ARG0: Signal number
* ARG1: Action to set (act)
* ARG2: Old action (old sigaction written here)
*/
scret_t
sys_sigaction(struct syscall_args *scargs)
{
struct proc *self = proc_self();
int sig;
struct sigaction *sap, *sap_old;
int error;
sig = SCARG(scargs, int, 0);
sap = SCARG(scargs, struct sigaction *, 1);
sap_old = SCARG(scargs, struct sigaction *, 2);
/* Sigactions at a valid address? */
error = proc_check_addr(self, (uintptr_t)sap, sizeof(*sap));
if (error < 0) {
return error;
}
/* Old sigactions at a valid address? */
error = proc_check_addr(self, (uintptr_t)sap_old, sizeof(sap_old));
if (error < 0) {
return error;
}
return do_sigaction(sig, sap, sap_old);
}
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