sigaction.c   [plain text]

/*
 * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
 *
 * @APPLE_LICENSE_HEADER_START@
 * 
 * Copyright (c) 1999-2003 Apple Computer, Inc.  All Rights Reserved.
 * 
 * This file contains Original Code and/or Modifications of Original Code
 * as defined in and that are subject to the Apple Public Source License
 * Version 2.0 (the 'License'). You may not use this file except in
 * compliance with the License. Please obtain a copy of the License at
 * http://www.opensource.apple.com/apsl/ and read it before using this
 * file.
 * 
 * The Original Code and all software distributed under the License are
 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
 * Please see the License for the specific language governing rights and
 * limitations under the License.
 * 
 * @APPLE_LICENSE_HEADER_END@
 */
/*
 * Copyright (c) 1995 NeXT Computer, Inc. All Rights Reserved
 *
 *	@(#)sigaction.c	1.0
 */

#include <sys/syscall.h>
#include <unistd.h>
#include <signal.h>
#include <sys/signal.h>
#include <errno.h>

/*
 *	Intercept the sigaction syscall and use our signal trampoline
 *	as the signal handler instead.  The code here is derived
 *	from sigvec in sys/kern_sig.c.
 */

#if defined(__DYNAMIC__)
extern int __in_sigtramp;
#endif

static int
sigaction__ (sig, nsv, osv, bind)
        int sig;
	register struct sigaction *nsv, *osv;
        int bind;
{
	extern void _sigtramp();
	struct __sigaction sa;
	struct __sigaction *sap;

	if (sig <= 0 || sig >= NSIG || sig == SIGKILL || sig == SIGSTOP) {
	        errno = EINVAL;
	        return (-1);
	}
	sap = (struct __sigaction *)0;
	if (nsv) {
		sa.sa_handler = nsv->sa_handler;
		sa.sa_tramp = _sigtramp;
		sa.sa_mask = nsv->sa_mask;
		sa.sa_flags = nsv->sa_flags;	
		sap = &sa;
	        if (nsv->sa_handler != (void (*)())SIG_DFL && nsv->sa_handler != (void (*)())SIG_IGN) {
#ifdef __DYNAMIC__
                    if (bind && (__in_sigtramp == 0))				// XXX
		  _dyld_bind_fully_image_containing_address(nsv->sa_handler);
#endif
	        }
	}
	if (syscall (SYS_sigaction, sig, sap, osv) < 0) {
	        return (-1);
	}
	return (0);
}


int
sigaction (sig, nsv, osv)
        int sig;
	register const struct sigaction *nsv;
        register struct sigaction *osv;
{
    return sigaction__(sig, nsv, osv, 1);
}

// XXX
#ifdef __DYNAMIC__

int
_sigaction_nobind (sig, nsv, osv)
        int sig;
	register const struct sigaction *nsv;
        register struct sigaction *osv;
{
    return sigaction__(sig, nsv, osv, 0);
}
#endif