lib/libc_r/uthread/uthread_accept.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_accept.c,v 1.13.2.5 2003/01/17 07:56:43 ru Exp $
  33  * $DragonFly: src/lib/libc_r/uthread/uthread_accept.c,v 1.4 2007/01/08 21:41:53 dillon Exp $
  34  */
  35 #include <errno.h>
  36 #include <unistd.h>
  37 #include <sys/types.h>
  38 #include <sys/socket.h>
  39 #include <fcntl.h>
  40 #include <pthread.h>
  41 #include "pthread_private.h"
  42
  43 int
  44 _accept(int fd, struct sockaddr * name, socklen_t *namelen)
  45 {
  46         struct pthread  *curthread = _get_curthread();
  47         int             ret;
  48
  49         /* Lock the file descriptor: */
  50         if ((ret = _FD_LOCK(fd, FD_RDWR, NULL)) == 0) {
  51                 /* Enter a loop to wait for a connection request: */
  52                 while ((ret = __sys_extaccept(fd, O_FNONBLOCKING, name, namelen)) < 0) {
  53                         /* Check if the socket is to block: */
  54                         if ((_thread_fd_getflags(fd) & O_NONBLOCK) == 0
  55                             && (errno == EWOULDBLOCK || errno == EAGAIN)) {
  56                                 /* Save the socket file descriptor: */
  57                                 curthread->data.fd.fd = fd;
  58                                 curthread->data.fd.fname = __FILE__;
  59                                 curthread->data.fd.branch = __LINE__;
  60
  61                                 /* Set the timeout: */
  62                                 _thread_kern_set_timeout(NULL);
  63                                 curthread->interrupted = 0;
  64
  65                                 /* Schedule the next thread: */
  66                                 _thread_kern_sched_state(PS_FDR_WAIT, __FILE__, __LINE__);
  67
  68                                 /* Check if the wait was interrupted: */
  69                                 if (curthread->interrupted) {
  70                                         /* Return an error status: */
  71                                         errno = EINTR;
  72                                         ret = -1;
  73                                         break;
  74                                 }
  75                         } else {
  76                                 /*
  77                                  * Another error has occurred, so exit the
  78                                  * loop here:
  79                                  */
  80                                 break;
  81                         }
  82                 }
  83
  84                 /* Check for errors: */
  85                 if (ret < 0) {
  86                 }
  87                 /* Initialise the file descriptor table for the new socket: */
  88                 else if (_thread_fd_table_init(ret) != 0) {
  89                         /* Quietly close the socket: */
  90                         __sys_close(ret);
  91
  92                         /* Return an error: */
  93                         ret = -1;
  94                 }
  95                 /*
  96                  * If the parent socket was blocking, make sure that
  97                  * the new socket is also set blocking here (as the
  98                  * call to _thread_fd_table_init() above will always
  99                  * set the new socket flags to non-blocking, as that
 100                  * will be the inherited state of the new socket.
 101                  */
 102                 if((ret > 0) && (_thread_fd_getflags(fd) & O_NONBLOCK) == 0)
 103                         _thread_fd_setflags(ret,
 104                             _thread_fd_getflags(ret) & ~O_NONBLOCK);
 105                 /* Unlock the file descriptor: */
 106                 _FD_UNLOCK(fd, FD_RDWR);
 107         }
 108         /* Return the socket file descriptor or -1 on error: */
 109         return (ret);
 110 }
 111
 112 int
 113 accept(int fd, struct sockaddr * name, socklen_t *namelen)
 114 {
 115         int ret;
 116
 117         _thread_enter_cancellation_point();
 118         ret = _accept(fd, name, namelen);
 119         _thread_leave_cancellation_point();
 120
 121         return (ret);
 122 }