lib/libc_r/uthread/uthread_recvmsg.c

   1 /*
   2  * Copyright (c) 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_recvmsg.c,v 1.7.2.5 2003/01/17 07:56:43 ru Exp $
  33  * $DragonFly: src/lib/libc_r/uthread/uthread_recvmsg.c,v 1.2 2003/06/17 04:26:48 dillon Exp $
  34  */
  35 #include <errno.h>
  36 #include <sys/types.h>
  37 #include <sys/socket.h>
  38 #include <fcntl.h>
  39 #include <pthread.h>
  40 #include "pthread_private.h"
  41
  42 ssize_t
  43 _recvmsg(int fd, struct msghdr *msg, int flags)
  44 {
  45         struct pthread  *curthread = _get_curthread();
  46         int             ret;
  47
  48         if ((ret = _FD_LOCK(fd, FD_READ, NULL)) == 0) {
  49                 while ((ret = __sys_recvmsg(fd, msg, flags)) < 0) {
  50                         if (((_thread_fd_getflags(fd) & O_NONBLOCK) == 0)
  51                             && ((errno == EWOULDBLOCK) || (errno == EAGAIN))) {
  52                                 curthread->data.fd.fd = fd;
  53
  54                                 /* Set the timeout: */
  55                                 _thread_kern_set_timeout(NULL);
  56                                 curthread->interrupted = 0;
  57                                 _thread_kern_sched_state(PS_FDR_WAIT, __FILE__, __LINE__);
  58
  59                                 /* Check if the wait was interrupted: */
  60                                 if (curthread->interrupted) {
  61                                         /* Return an error status: */
  62                                         errno = EINTR;
  63                                         ret = -1;
  64                                         break;
  65                                 }
  66                         } else {
  67                                 ret = -1;
  68                                 break;
  69                         }
  70                 }
  71                 _FD_UNLOCK(fd, FD_READ);
  72         }
  73         return (ret);
  74 }
  75
  76 ssize_t
  77 recvmsg(int fd, struct msghdr *msg, int flags)
  78 {
  79         int ret;
  80
  81         _thread_enter_cancellation_point();
  82         ret = _recvmsg(fd, msg, flags);
  83         _thread_leave_cancellation_point();
  84
  85         return (ret);
  86 }