lib/libc_r/uthread/uthread_kill.c

   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: src/lib/libc_r/uthread/uthread_kill.c,v 1.10.2.1 2002/10/22 14:44:03 fjoe Exp $
  33  * $DragonFly: src/lib/libc_r/uthread/uthread_kill.c,v 1.3 2005/05/30 20:50:53 joerg Exp $
  34  */
  35 #include <errno.h>
  36 #include <signal.h>
  37 #include <pthread.h>
  38 #include "pthread_private.h"
  39
  40 int
  41 _pthread_kill(pthread_t pthread, int sig)
  42 {
  43         int ret;
  44
  45         /* Check for invalid signal numbers: */
  46         if (sig < 0 || sig >= NSIG)
  47                 /* Invalid signal: */
  48                 ret = EINVAL;
  49         /*
  50          * Ensure the thread is in the list of active threads, and the
  51          * signal is valid (signal 0 specifies error checking only) and
  52          * not being ignored:
  53          */
  54         else if (((ret = _find_thread(pthread)) == 0) && (sig > 0) &&
  55             (_thread_sigact[sig - 1].sa_handler != SIG_IGN)) {
  56                 /*
  57                  * Defer signals to protect the scheduling queues from
  58                  * access by the signal handler:
  59                  */
  60                 _thread_kern_sig_defer();
  61
  62                 _thread_sig_send(pthread, sig);
  63
  64                 /*
  65                  * Undefer and handle pending signals, yielding if
  66                  * necessary:
  67                  */
  68                 _thread_kern_sig_undefer();
  69         }
  70
  71         /* Return the completion status: */
  72         return (ret);
  73 }
  74
  75 __strong_reference(_pthread_kill, pthread_kill);