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linux_sigaction.c revision 1.30.18.1 
      1 /*	$NetBSD: linux_sigaction.c,v 1.30.18.1 2007/10/26 15:43:59 joerg 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/cdefs.h>
     44 __KERNEL_RCSID(0, "$NetBSD: linux_sigaction.c,v 1.30.18.1 2007/10/26 15:43:59 joerg Exp $");
     45 
     46 #include <sys/param.h>
     47 #include <sys/systm.h>
     48 #include <sys/proc.h>
     49 #include <sys/filedesc.h>
     50 #include <sys/mount.h>
     51 #include <sys/kernel.h>
     52 #include <sys/signal.h>
     53 #include <sys/signalvar.h>
     54 
     55 #include <sys/syscallargs.h>
     56 
     57 #include <compat/linux/common/linux_types.h>
     58 #include <compat/linux/common/linux_signal.h>
     59 #include <compat/linux/common/linux_util.h>
     60 #include <compat/linux/common/linux_ipc.h>
     61 #include <compat/linux/common/linux_sem.h>
     62 
     63 #include <compat/linux/linux_syscallargs.h>
     64 
     65 /* Used on: alpha (aka osf_sigaction), arm, i386, m68k, mips, ppc */
     66 /* Not used on: sparc, sparc64, amd64 */
     67 
     68 #ifndef __amd64__
     69 /*
     70  * The Linux sigaction() system call. Do the usual conversions,
     71  * and just call sigaction().
     72  */
     73 int
     74 linux_sys_sigaction(struct lwp *l, void *v, register_t *retval)
     75 {
     76 	struct linux_sys_sigaction_args /* {
     77 		syscallarg(int) signum;
     78 		syscallarg(const struct linux_old_sigaction *) nsa;
     79 		syscallarg(struct linux_old_sigaction *) osa;
     80 	} */ *uap = v;
     81 	struct linux_old_sigaction nlsa, olsa;
     82 	struct sigaction nbsa, obsa;
     83 	int error, sig;
     84 
     85 	/* XXX XAX handle switch to RT signal handler */
     86 	/* XXX XAX and update emuldata->ps_siginfo. */
     87 
     88 	if (SCARG(uap, nsa)) {
     89 		error = copyin(SCARG(uap, nsa), &nlsa, sizeof(nlsa));
     90 		if (error)
     91 			return (error);
     92 		linux_old_to_native_sigaction(&nbsa, &nlsa);
     93 	}
     94 	sig = SCARG(uap, signum);
     95 	if (sig < 0 || sig >= LINUX__NSIG)
     96 		return (EINVAL);
     97 	if (sig > 0 && !linux_to_native_signo[sig]) {
     98 		/* Pretend that we did something useful for unknown signals. */
     99 		obsa.sa_handler = SIG_IGN;
    100 		sigemptyset(&obsa.sa_mask);
    101 		obsa.sa_flags = 0;
    102 	} else {
    103 		error = sigaction1(l, linux_to_native_signo[sig],
    104 		    SCARG(uap, nsa) ? &nbsa : 0, SCARG(uap, osa) ? &obsa : 0,
    105 		    NULL, 0);
    106 		if (error)
    107 			return (error);
    108 	}
    109 	if (SCARG(uap, osa)) {
    110 		native_to_linux_old_sigaction(&olsa, &obsa);
    111 		error = copyout(&olsa, SCARG(uap, osa), sizeof(olsa));
    112 		if (error)
    113 			return (error);
    114 	}
    115 	return (0);
    116 }
    117 #endif /* !amd64 */
    118