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linux_sigaction.c revision 1.33.2.1 
      1 /*	$NetBSD: linux_sigaction.c,v 1.33.2.1 2008/05/10 23:48:56 wrstuden 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  *
     19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     29  * POSSIBILITY OF SUCH DAMAGE.
     30  */
     31 
     32 /*
     33  * heavily from: svr4_signal.c,v 1.7 1995/01/09 01:04:21 christos Exp
     34  */
     35 
     36 #include <sys/cdefs.h>
     37 __KERNEL_RCSID(0, "$NetBSD: linux_sigaction.c,v 1.33.2.1 2008/05/10 23:48:56 wrstuden Exp $");
     38 
     39 #include <sys/param.h>
     40 #include <sys/systm.h>
     41 #include <sys/proc.h>
     42 #include <sys/filedesc.h>
     43 #include <sys/mount.h>
     44 #include <sys/kernel.h>
     45 #include <sys/signal.h>
     46 #include <sys/signalvar.h>
     47 
     48 #include <sys/sa.h>
     49 #include <sys/syscallargs.h>
     50 
     51 #include <compat/linux/common/linux_types.h>
     52 #include <compat/linux/common/linux_signal.h>
     53 #include <compat/linux/common/linux_util.h>
     54 #include <compat/linux/common/linux_ipc.h>
     55 #include <compat/linux/common/linux_sem.h>
     56 
     57 #include <compat/linux/linux_syscallargs.h>
     58 
     59 /* Used on: alpha (aka osf_sigaction), arm, i386, m68k, mips, ppc */
     60 /* Not used on: sparc, sparc64, amd64 */
     61 
     62 #ifndef __amd64__
     63 /*
     64  * The Linux sigaction() system call. Do the usual conversions,
     65  * and just call sigaction().
     66  */
     67 int
     68 linux_sys_sigaction(struct lwp *l, const struct linux_sys_sigaction_args *uap, register_t *retval)
     69 {
     70 	/* {
     71 		syscallarg(int) signum;
     72 		syscallarg(const struct linux_old_sigaction *) nsa;
     73 		syscallarg(struct linux_old_sigaction *) osa;
     74 	} */
     75 	struct linux_old_sigaction nlsa, olsa;
     76 	struct sigaction nbsa, obsa;
     77 	int error, sig;
     78 
     79 	/* XXX XAX handle switch to RT signal handler */
     80 	/* XXX XAX and update emuldata->ps_siginfo. */
     81 
     82 	if (SCARG(uap, nsa)) {
     83 		error = copyin(SCARG(uap, nsa), &nlsa, sizeof(nlsa));
     84 		if (error)
     85 			return (error);
     86 		linux_old_to_native_sigaction(&nbsa, &nlsa);
     87 	}
     88 	sig = SCARG(uap, signum);
     89 	if (sig < 0 || sig >= LINUX__NSIG)
     90 		return (EINVAL);
     91 	if (sig > 0 && !linux_to_native_signo[sig]) {
     92 		/* Pretend that we did something useful for unknown signals. */
     93 		obsa.sa_handler = SIG_IGN;
     94 		sigemptyset(&obsa.sa_mask);
     95 		obsa.sa_flags = 0;
     96 	} else {
     97 		error = sigaction1(l, linux_to_native_signo[sig],
     98 		    SCARG(uap, nsa) ? &nbsa : 0, SCARG(uap, osa) ? &obsa : 0,
     99 		    NULL, 0);
    100 		if (error)
    101 			return (error);
    102 	}
    103 	if (SCARG(uap, osa)) {
    104 		native_to_linux_old_sigaction(&olsa, &obsa);
    105 		error = copyout(&olsa, SCARG(uap, osa), sizeof(olsa));
    106 		if (error)
    107 			return (error);
    108 	}
    109 	return (0);
    110 }
    111 #endif /* !amd64 */
    112