/*      $NetBSD: linux_sig_notalpha.c,v 1.41 2021/11/25 03:08:04 ryo Exp $      */

/*-
* Copyright (c) 1995, 1998 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Frank van der Linden and Eric Haszlakiewicz.
*
* 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 NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
*/

/*
* heavily from: svr4_signal.c,v 1.7 1995/01/09 01:04:21 christos Exp
*/

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: linux_sig_notalpha.c,v 1.41 2021/11/25 03:08:04 ryo Exp $");

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/proc.h>
#include <sys/filedesc.h>
#include <sys/mount.h>
#include <sys/kernel.h>
#include <sys/signal.h>
#include <sys/signalvar.h>

#include <sys/syscallargs.h>

#include <compat/linux/common/linux_types.h>
#include <compat/linux/common/linux_signal.h>
#include <compat/linux/common/linux_util.h>
#include <compat/linux/common/linux_ipc.h>
#include <compat/linux/common/linux_sem.h>

#include <compat/linux/linux_syscallargs.h>

/* Used on: arm, i386, m68k, mips, sparc, sparc64 */
/* Partly used on: aarch64, amd64 */
/* Not used on: alpha */

#if !defined(__aarch64__) && !defined(__amd64__)
/*
* The Linux signal() system call. I think that the signal() in the C
* library actually calls sigaction, so I doubt this one is ever used.
* But hey, it can't hurt having it here. The same restrictions as for
* sigaction() apply.
*/
int
linux_sys_signal(struct lwp *l, const struct linux_sys_signal_args *uap, register_t *retval)
{
       /* {
               syscallarg(int) signum;
               syscallarg(linux_handler_t) handler;
       } */
       struct sigaction nbsa, obsa;
       int error, sig;

       *retval = -1;
       sig = SCARG(uap, signum);
       if (sig < 0 || sig >= LINUX__NSIG)
               return (EINVAL);

       nbsa.sa_handler = SCARG(uap, handler);
       sigemptyset(&nbsa.sa_mask);
       nbsa.sa_flags = SA_RESETHAND | SA_NODEFER;
       error = sigaction1(l, linux_to_native_signo[sig],
           &nbsa, &obsa, NULL, 0);
       if (error == 0)
               *retval = (int)(long)obsa.sa_handler; /* XXXmanu cast */
       return (error);
}


/* ARGSUSED */
int
linux_sys_siggetmask(struct lwp *l, const void *v, register_t *retval)
{
       struct proc *p = l->l_proc;
       sigset_t bss;
       linux_old_sigset_t lss;
       int error;

       mutex_enter(p->p_lock);
       error = sigprocmask1(l, SIG_SETMASK, 0, &bss);
       mutex_exit(p->p_lock);
       if (error)
               return (error);
       native_to_linux_old_sigset(&lss, &bss);
       *retval = lss;
       return (0);
}

/*
* The following three functions fiddle with a process' signal mask.
* Convert the signal masks because of the different signal
* values for Linux. The need for this is the reason why
* they are here, and have not been mapped directly.
*/
int
linux_sys_sigsetmask(struct lwp *l, const struct linux_sys_sigsetmask_args *uap, register_t *retval)
{
       /* {
               syscallarg(linux_old_sigset_t) mask;
       } */
       sigset_t nbss, obss;
       linux_old_sigset_t nlss, olss;
       struct proc *p = l->l_proc;
       int error;

       nlss = SCARG(uap, mask);
       linux_old_to_native_sigset(&nbss, &nlss);
       mutex_enter(p->p_lock);
       error = sigprocmask1(l, SIG_SETMASK, &nbss, &obss);
       mutex_exit(p->p_lock);
       if (error)
               return (error);
       native_to_linux_old_sigset(&olss, &obss);
       *retval = olss;
       return (0);
}

int
linux_sys_sigprocmask(struct lwp *l, const struct linux_sys_sigprocmask_args *uap, register_t *retval)
{
       /* {
               syscallarg(int) how;
               syscallarg(const linux_old_sigset_t *) set;
               syscallarg(linux_old_sigset_t *) oset;
       } */

       return(linux_sigprocmask1(l, SCARG(uap, how),
                               SCARG(uap, set), SCARG(uap, oset)));
}
#endif /* !__amd64__ */

/*
* The deprecated pause(2), which is really just an instance
* of sigsuspend(2).
*/
int
linux_sys_pause(struct lwp *l, const void *v, register_t *retval)
{

       return (sigsuspend1(l, 0));
}