lib/libc_r/uthread/uthread_wait4.c

   1 /*
   2  * Copyright (c) 1995-1998 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_wait4.c,v 1.10.2.5 2002/10/22 14:44:03 fjoe Exp $
  33  * $DragonFly: src/lib/libc_r/uthread/uthread_wait4.c,v 1.2 2003/06/17 06:26:48 dillon Exp $
  34  */
  35 #include <sys/types.h>
  36
  37 #include <errno.h>
  38 #include <sys/wait.h>
  39 #include <pthread.h>
  40 #include "pthread_private.h"
  41
  42 pid_t
  43 _wait4(pid_t pid, int *istat, int options, struct rusage * rusage)
  44 {
  45         struct pthread  *curthread = _get_curthread();
  46         pid_t   ret;
  47
  48         _thread_kern_sig_defer();
  49
  50         /* Perform a non-blocking wait4 syscall: */
  51         while ((ret = __sys_wait4(pid, istat, options | WNOHANG, rusage)) == 0 && (options & WNOHANG) == 0) {
  52                 /* Reset the interrupted operation flag: */
  53                 curthread->interrupted = 0;
  54
  55                 /* Schedule the next thread while this one waits: */
  56                 _thread_kern_sched_state(PS_WAIT_WAIT, __FILE__, __LINE__);
  57
  58                 /* Check if this call was interrupted by a signal: */
  59                 if (curthread->interrupted) {
  60                         errno = EINTR;
  61                         ret = -1;
  62                         break;
  63                 }
  64         }
  65
  66         _thread_kern_sig_undefer();
  67
  68         return (ret);
  69 }
  70
  71 pid_t
  72 wait4(pid_t pid, int *istat, int options, struct rusage *rusage)
  73 {
  74         pid_t ret;
  75
  76         _thread_enter_cancellation_point();
  77         ret = _wait4(pid, istat, options, rusage);
  78         _thread_leave_cancellation_point();
  79
  80         return ret;
  81 }