The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/kern/sys_socket.c

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    1 /*      $NetBSD: sys_socket.c,v 1.39 2003/09/21 19:17:08 jdolecek Exp $ */
    2 
    3 /*
    4  * Copyright (c) 1982, 1986, 1990, 1993
    5  *      The Regents of the University of California.  All rights reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   10  * 1. Redistributions of source code must retain the above copyright
   11  *    notice, this list of conditions and the following disclaimer.
   12  * 2. Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions and the following disclaimer in the
   14  *    documentation and/or other materials provided with the distribution.
   15  * 3. Neither the name of the University nor the names of its contributors
   16  *    may be used to endorse or promote products derived from this software
   17  *    without specific prior written permission.
   18  *
   19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   29  * SUCH DAMAGE.
   30  *
   31  *      @(#)sys_socket.c        8.3 (Berkeley) 2/14/95
   32  */
   33 
   34 #include <sys/cdefs.h>
   35 __KERNEL_RCSID(0, "$NetBSD: sys_socket.c,v 1.39 2003/09/21 19:17:08 jdolecek Exp $");
   36 
   37 #include <sys/param.h>
   38 #include <sys/systm.h>
   39 #include <sys/file.h>
   40 #include <sys/mbuf.h>
   41 #include <sys/protosw.h>
   42 #include <sys/socket.h>
   43 #include <sys/socketvar.h>
   44 #include <sys/ioctl.h>
   45 #include <sys/stat.h>
   46 #include <sys/poll.h>
   47 #include <sys/proc.h>
   48 
   49 #include <net/if.h>
   50 #include <net/route.h>
   51 
   52 struct  fileops socketops = {
   53         soo_read, soo_write, soo_ioctl, soo_fcntl, soo_poll,
   54         soo_stat, soo_close, soo_kqfilter
   55 };
   56 
   57 /* ARGSUSED */
   58 int
   59 soo_read(fp, offset, uio, cred, flags)
   60         struct file *fp;
   61         off_t *offset;
   62         struct uio *uio;
   63         struct ucred *cred;
   64         int flags;
   65 {
   66         struct socket *so = (struct socket *) fp->f_data;
   67         return ((*so->so_receive)(so, (struct mbuf **)0,
   68                 uio, (struct mbuf **)0, (struct mbuf **)0, (int *)0));
   69 }
   70 
   71 /* ARGSUSED */
   72 int
   73 soo_write(fp, offset, uio, cred, flags)
   74         struct file *fp;
   75         off_t *offset;
   76         struct uio *uio;
   77         struct ucred *cred;
   78         int flags;
   79 {
   80         struct socket *so = (struct socket *) fp->f_data;
   81         return ((*so->so_send)(so, (struct mbuf *)0,
   82                 uio, (struct mbuf *)0, (struct mbuf *)0, 0));
   83 }
   84 
   85 int
   86 soo_ioctl(fp, cmd, data, p)
   87         struct file *fp;
   88         u_long cmd;
   89         void *data;
   90         struct proc *p;
   91 {
   92         struct socket *so = (struct socket *)fp->f_data;
   93 
   94         switch (cmd) {
   95 
   96         case FIONBIO:
   97                 if (*(int *)data)
   98                         so->so_state |= SS_NBIO;
   99                 else
  100                         so->so_state &= ~SS_NBIO;
  101                 return (0);
  102 
  103         case FIOASYNC:
  104                 if (*(int *)data) {
  105                         so->so_state |= SS_ASYNC;
  106                         so->so_rcv.sb_flags |= SB_ASYNC;
  107                         so->so_snd.sb_flags |= SB_ASYNC;
  108                 } else {
  109                         so->so_state &= ~SS_ASYNC;
  110                         so->so_rcv.sb_flags &= ~SB_ASYNC;
  111                         so->so_snd.sb_flags &= ~SB_ASYNC;
  112                 }
  113                 return (0);
  114 
  115         case FIONREAD:
  116                 *(int *)data = so->so_rcv.sb_cc;
  117                 return (0);
  118 
  119         case SIOCSPGRP:
  120         case FIOSETOWN:
  121         case TIOCSPGRP:
  122                 return fsetown(p, &so->so_pgid, cmd, data);
  123 
  124         case SIOCGPGRP:
  125         case FIOGETOWN:
  126         case TIOCGPGRP:
  127                 return fgetown(p, so->so_pgid, cmd, data);
  128 
  129         case SIOCATMARK:
  130                 *(int *)data = (so->so_state&SS_RCVATMARK) != 0;
  131                 return (0);
  132         }
  133         /*
  134          * Interface/routing/protocol specific ioctls:
  135          * interface and routing ioctls should have a
  136          * different entry since a socket's unnecessary
  137          */
  138         if (IOCGROUP(cmd) == 'i')
  139                 return (ifioctl(so, cmd, data, p));
  140         if (IOCGROUP(cmd) == 'r')
  141                 return (rtioctl(cmd, data, p));
  142         return ((*so->so_proto->pr_usrreq)(so, PRU_CONTROL, 
  143             (struct mbuf *)cmd, (struct mbuf *)data, (struct mbuf *)0, p));
  144 }
  145 
  146 int
  147 soo_fcntl(fp, cmd, data, p)
  148         struct file *fp;
  149         u_int cmd;
  150         void *data;
  151         struct proc *p;
  152 {
  153         if (cmd == F_SETFL)
  154                 return (0);
  155         else
  156                 return (EOPNOTSUPP);
  157 }
  158 
  159 int
  160 soo_poll(fp, events, p)
  161         struct file *fp;
  162         int events;
  163         struct proc *p;
  164 {
  165         struct socket *so = (struct socket *)fp->f_data;
  166         int revents = 0;
  167         int s = splsoftnet();
  168 
  169         if (events & (POLLIN | POLLRDNORM))
  170                 if (soreadable(so))
  171                         revents |= events & (POLLIN | POLLRDNORM);
  172 
  173         if (events & (POLLOUT | POLLWRNORM))
  174                 if (sowritable(so))
  175                         revents |= events & (POLLOUT | POLLWRNORM);
  176 
  177         if (events & (POLLPRI | POLLRDBAND))
  178                 if (so->so_oobmark || (so->so_state & SS_RCVATMARK))
  179                         revents |= events & (POLLPRI | POLLRDBAND);
  180 
  181         if (revents == 0) {
  182                 if (events & (POLLIN | POLLPRI | POLLRDNORM | POLLRDBAND)) {
  183                         selrecord(p, &so->so_rcv.sb_sel);
  184                         so->so_rcv.sb_flags |= SB_SEL;
  185                 }
  186 
  187                 if (events & (POLLOUT | POLLWRNORM)) {
  188                         selrecord(p, &so->so_snd.sb_sel);
  189                         so->so_snd.sb_flags |= SB_SEL;
  190                 }
  191         }
  192 
  193         splx(s);
  194         return (revents);
  195 }
  196 
  197 int
  198 soo_stat(fp, ub, p)
  199         struct file *fp;
  200         struct stat *ub;
  201         struct proc *p;
  202 {
  203         struct socket *so = (struct socket *)fp->f_data;
  204 
  205         memset((caddr_t)ub, 0, sizeof(*ub));
  206         ub->st_mode = S_IFSOCK;
  207         return ((*so->so_proto->pr_usrreq)(so, PRU_SENSE,
  208             (struct mbuf *)ub, (struct mbuf *)0, (struct mbuf *)0, p));
  209 }
  210 
  211 /* ARGSUSED */
  212 int
  213 soo_close(fp, p)
  214         struct file *fp;
  215         struct proc *p;
  216 {
  217         int error = 0;
  218 
  219         if (fp->f_data)
  220                 error = soclose((struct socket *)fp->f_data);
  221         fp->f_data = 0;
  222         return (error);
  223 }

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