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linux_sigaction.c revision 1.20.2.2 
      1 /*	$NetBSD: linux_sigaction.c,v 1.20.2.2 2001/08/30 23:28:03 nathanw Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 1995, 1998 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Frank van der Linden and Eric Haszlakiewicz.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  * 3. All advertising materials mentioning features or use of this software
     19  *    must display the following acknowledgement:
     20  *	This product includes software developed by the NetBSD
     21  *	Foundation, Inc. and its contributors.
     22  * 4. Neither the name of The NetBSD Foundation nor the names of its
     23  *    contributors may be used to endorse or promote products derived
     24  *    from this software without specific prior written permission.
     25  *
     26  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     27  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     28  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     29  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     30  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     31  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     32  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     33  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     34  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     35  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     36  * POSSIBILITY OF SUCH DAMAGE.
     37  */
     38 
     39 /*
     40  * heavily from: svr4_signal.c,v 1.7 1995/01/09 01:04:21 christos Exp
     41  */
     42 
     43 #include <sys/param.h>
     44 #include <sys/systm.h>
     45 #include <sys/lwp.h>
     46 #include <sys/proc.h>
     47 #include <sys/filedesc.h>
     48 #include <sys/mount.h>
     49 #include <sys/kernel.h>
     50 #include <sys/signal.h>
     51 #include <sys/signalvar.h>
     52 
     53 #include <sys/syscallargs.h>
     54 
     55 #include <compat/linux/common/linux_types.h>
     56 #include <compat/linux/common/linux_signal.h>
     57 #include <compat/linux/common/linux_util.h>
     58 
     59 #include <compat/linux/linux_syscallargs.h>
     60 
     61 /* Used on: alpha (aka osf_sigaction), arm, i386, m68k, mips, ppc */
     62 /* Not used on: sparc, sparc64 */
     63 
     64 /*
     65  * The Linux sigaction() system call. Do the usual conversions,
     66  * and just call sigaction().
     67  */
     68 int
     69 linux_sys_sigaction(l, v, retval)
     70 	struct lwp *l;
     71 	void *v;
     72 	register_t *retval;
     73 {
     74 	struct linux_sys_sigaction_args /* {
     75 		syscallarg(int) signum;
     76 		syscallarg(const struct linux_old_sigaction *) nsa;
     77 		syscallarg(struct linux_old_sigaction *) osa;
     78 	} */ *uap = v;
     79 	struct proc *p = l->l_proc;
     80 	struct linux_old_sigaction nlsa, olsa;
     81 	struct sigaction nbsa, obsa;
     82 	int error, sig;
     83 
     84 	/* XXX XAX handle switch to RT signal handler */
     85 	/* XXX XAX and update emuldata->ps_siginfo. */
     86 
     87 	if (SCARG(uap, nsa)) {
     88 		error = copyin(SCARG(uap, nsa), &nlsa, sizeof(nlsa));
     89 		if (error)
     90 			return (error);
     91 		linux_old_to_native_sigaction(&nlsa, &nbsa);
     92 	}
     93 	sig = SCARG(uap, signum);
     94 	if (sig < 0 || sig >= LINUX__NSIG)
     95 		return (EINVAL);
     96 	if (sig > 0 && !linux_to_native_sig[sig]) {
     97 		/* Pretend that we did something useful for unknown signals. */
     98 		obsa.sa_handler = SIG_IGN;
     99 		sigemptyset(&obsa.sa_mask);
    100 		obsa.sa_flags = 0;
    101 	} else {
    102 		error = sigaction1(p, linux_to_native_sig[sig],
    103 		    SCARG(uap, nsa) ? &nbsa : 0, SCARG(uap, osa) ? &obsa : 0);
    104 		if (error)
    105 			return (error);
    106 	}
    107 	if (SCARG(uap, osa)) {
    108 		native_to_linux_old_sigaction(&obsa, &olsa);
    109 		error = copyout(&olsa, SCARG(uap, osa), sizeof(olsa));
    110 		if (error)
    111 			return (error);
    112 	}
    113 	return (0);
    114 }
    115