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 /*      $OpenBSD: sys_socket.c,v 1.60 2023/01/22 12:05:44 mvs Exp $     */
    2 /*      $NetBSD: sys_socket.c,v 1.13 1995/08/12 23:59:09 mycroft Exp $  */
    3 
    4 /*
    5  * Copyright (c) 1982, 1986, 1990, 1993
    6  *      The Regents of the University of California.  All rights reserved.
    7  *
    8  * Redistribution and use in source and binary forms, with or without
    9  * modification, are permitted provided that the following conditions
   10  * are met:
   11  * 1. Redistributions of source code must retain the above copyright
   12  *    notice, this list of conditions and the following disclaimer.
   13  * 2. Redistributions in binary form must reproduce the above copyright
   14  *    notice, this list of conditions and the following disclaimer in the
   15  *    documentation and/or other materials provided with the distribution.
   16  * 3. Neither the name of the University nor the names of its 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 THE REGENTS 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 REGENTS 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  *      @(#)sys_socket.c        8.1 (Berkeley) 6/10/93
   33  */
   34 
   35 #include <sys/param.h>
   36 #include <sys/systm.h>
   37 #include <sys/file.h>
   38 #include <sys/proc.h>
   39 #include <sys/mbuf.h>
   40 #include <sys/protosw.h>
   41 #include <sys/socket.h>
   42 #include <sys/socketvar.h>
   43 #include <sys/ioctl.h>
   44 #include <sys/stat.h>
   45 #include <sys/fcntl.h>
   46 
   47 #include <net/if.h>
   48 
   49 const struct fileops socketops = {
   50         .fo_read        = soo_read,
   51         .fo_write       = soo_write,
   52         .fo_ioctl       = soo_ioctl,
   53         .fo_kqfilter    = soo_kqfilter,
   54         .fo_stat        = soo_stat,
   55         .fo_close       = soo_close
   56 };
   57 
   58 int
   59 soo_read(struct file *fp, struct uio *uio, int fflags)
   60 {
   61         struct socket *so = (struct socket *)fp->f_data;
   62         int flags = 0;
   63 
   64         if (fp->f_flag & FNONBLOCK)
   65                 flags |= MSG_DONTWAIT;
   66 
   67         return (soreceive(so, NULL, uio, NULL, NULL, &flags, 0));
   68 }
   69 
   70 int
   71 soo_write(struct file *fp, struct uio *uio, int fflags)
   72 {
   73         struct socket *so = (struct socket *)fp->f_data;
   74         int flags = 0;
   75 
   76         if (fp->f_flag & FNONBLOCK)
   77                 flags |= MSG_DONTWAIT;
   78 
   79         return (sosend(so, NULL, uio, NULL, NULL, flags));
   80 }
   81 
   82 int
   83 soo_ioctl(struct file *fp, u_long cmd, caddr_t data, struct proc *p)
   84 {
   85         struct socket *so = (struct socket *)fp->f_data;
   86         int error = 0;
   87 
   88         switch (cmd) {
   89 
   90         case FIONBIO:
   91                 break;
   92 
   93         case FIOASYNC:
   94                 solock(so);
   95                 if (*(int *)data) {
   96                         so->so_rcv.sb_flags |= SB_ASYNC;
   97                         so->so_snd.sb_flags |= SB_ASYNC;
   98                 } else {
   99                         so->so_rcv.sb_flags &= ~SB_ASYNC;
  100                         so->so_snd.sb_flags &= ~SB_ASYNC;
  101                 }
  102                 sounlock(so);
  103                 break;
  104 
  105         case FIONREAD:
  106                 *(int *)data = so->so_rcv.sb_datacc;
  107                 break;
  108 
  109         case FIOSETOWN:
  110         case SIOCSPGRP:
  111         case TIOCSPGRP:
  112                 error = sigio_setown(&so->so_sigio, cmd, data);
  113                 break;
  114 
  115         case FIOGETOWN:
  116         case SIOCGPGRP:
  117         case TIOCGPGRP:
  118                 sigio_getown(&so->so_sigio, cmd, data);
  119                 break;
  120 
  121         case SIOCATMARK:
  122                 *(int *)data = (so->so_rcv.sb_state & SS_RCVATMARK) != 0;
  123                 break;
  124 
  125         default:
  126                 /*
  127                  * Interface/routing/protocol specific ioctls:
  128                  * interface and routing ioctls should have a
  129                  * different entry since a socket's unnecessary
  130                  */
  131                 if (IOCGROUP(cmd) == 'i') {
  132                         error = ifioctl(so, cmd, data, p);
  133                         return (error);
  134                 }
  135                 if (IOCGROUP(cmd) == 'r')
  136                         return (EOPNOTSUPP);
  137                 error = pru_control(so, cmd, data, NULL);
  138                 break;
  139         }
  140 
  141         return (error);
  142 }
  143 
  144 int
  145 soo_stat(struct file *fp, struct stat *ub, struct proc *p)
  146 {
  147         struct socket *so = fp->f_data;
  148 
  149         memset(ub, 0, sizeof (*ub));
  150         ub->st_mode = S_IFSOCK;
  151         solock(so);
  152         if ((so->so_rcv.sb_state & SS_CANTRCVMORE) == 0 ||
  153             so->so_rcv.sb_cc != 0)
  154                 ub->st_mode |= S_IRUSR | S_IRGRP | S_IROTH;
  155         if ((so->so_snd.sb_state & SS_CANTSENDMORE) == 0)
  156                 ub->st_mode |= S_IWUSR | S_IWGRP | S_IWOTH;
  157         ub->st_uid = so->so_euid;
  158         ub->st_gid = so->so_egid;
  159         (void)pru_sense(so, ub);
  160         sounlock(so);
  161         return (0);
  162 }
  163 
  164 int
  165 soo_close(struct file *fp, struct proc *p)
  166 {
  167         int flags, error = 0;
  168 
  169         if (fp->f_data) {
  170                 flags = (fp->f_flag & FNONBLOCK) ? MSG_DONTWAIT : 0;
  171                 error = soclose(fp->f_data, flags);
  172         }
  173         fp->f_data = NULL;
  174         return (error);
  175 }

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