thr_kill.c revision 75369 
1/*
2 * Copyright (c) 1997 John Birrell <jb@cimlogic.com.au>.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 *    must display the following acknowledgement:
15 *	This product includes software developed by John Birrell.
16 * 4. Neither the name of the author nor the names of any co-contributors
17 *    may be used to endorse or promote products derived from this software
18 *    without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY JOHN BIRRELL AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 *
32 * $FreeBSD: head/lib/libkse/thread/thr_kill.c 75369 2001-04-10 04:19:21Z deischen $
33 */
34#include <errno.h>
35#include <signal.h>
36#include <pthread.h>
37#include "pthread_private.h"
38
39__weak_reference(_pthread_kill, pthread_kill);
40
41int
42_pthread_kill(pthread_t pthread, int sig)
43{
44	int ret;
45
46	/* Check for invalid signal numbers: */
47	if (sig < 0 || sig >= NSIG)
48		/* Invalid signal: */
49		ret = EINVAL;
50	/*
51	 * Ensure the thread is in the list of active threads, and the
52	 * signal is valid (signal 0 specifies error checking only) and
53	 * not being ignored:
54	 */
55	else if (((ret = _find_thread(pthread)) == 0) && (sig > 0) &&
56	    (_thread_sigact[sig - 1].sa_handler != SIG_IGN)) {
57		/*
58		 * Defer signals to protect the scheduling queues from
59		 * access by the signal handler:
60		 */
61		_thread_kern_sig_defer();
62
63		_thread_sig_send(pthread, sig);
64
65		/*
66		 * Undefer and handle pending signals, yielding if
67		 * necessary:
68		 */
69		_thread_kern_sig_undefer();
70	}
71
72	/* Return the completion status: */
73	return (ret);
74}
75