freebsd-dev/lib/libc_r/uthread/uthread_accept.c

/*
 * Copyright (c) 1995 John Birrell <jb@cimlogic.com.au>.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by John Birrell.
 * 4. Neither the name of the author nor the names of any co-contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY JOHN BIRRELL AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 */
#include <errno.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <fcntl.h>
#ifdef _THREAD_SAFE
#include <pthread.h>
#include "pthread_private.h"

int
accept(int fd, struct sockaddr * name, int *namelen)
{
	int             ret;

	/* Lock the file descriptor: */
	if ((ret = _thread_fd_lock(fd, FD_RDWR, NULL, __FILE__, __LINE__)) == 0) {
		/* Enter a loop to wait for a connection request: */
		while ((ret = _thread_sys_accept(fd, name, namelen)) < 0) {
			/* Check if the socket is to block: */
			if ((_thread_fd_table[fd]->flags & O_NONBLOCK) == 0 && (errno == EWOULDBLOCK || errno == EAGAIN)) {
				/* Save the socket file descriptor: */
				_thread_run->data.fd.fd = fd;
				_thread_run->data.fd.fname = __FILE__;
				_thread_run->data.fd.branch = __LINE__;

				/* Set the timeout: */
				_thread_kern_set_timeout(NULL);

				/* Schedule the next thread: */
				_thread_kern_sched_state(PS_FDR_WAIT, __FILE__, __LINE__);

				/* Check if the wait was interrupted: */
				if (errno == EINTR) {
					/* Return an error status: */
					ret = -1;
					break;
				}
			} else {
				/*
				 * Another error has occurred, so exit the
				 * loop here: 
				 */
				break;
			}
		}

		/* Check for errors: */
		if (ret < 0) {
		}
		/* Initialise the file descriptor table for the new socket: */
		else if (_thread_fd_table_init(ret) != 0) {
			/* Quietly close the socket: */
			_thread_sys_close(ret);

			/* Return an error: */
			ret = -1;
		}
		/* 
                 * If the parent socket was blocking, make sure that
                 * the new socket is also set blocking here (as the
		 * call to _thread_fd_table_init() above will always 
		 * set the new socket flags to non-blocking, as that 
		 * will be the inherited state of the new socket.
		 */
		if((ret > 0) && (_thread_fd_table[fd]->flags & O_NONBLOCK) == 0)
			_thread_fd_table[ret]->flags &= ~O_NONBLOCK;

		/* Unlock the file descriptor: */
		_thread_fd_unlock(fd, FD_RDWR);
	}
	/* Return the socket file descriptor or -1 on error: */
	return (ret);
}
#endif