sys_socket.c

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    1 /*
    2  * Copyright (c) 1982, 1986, 1990, 1993
    3  *      The Regents of the University of California.  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. Neither the name of the University nor the names of its contributors
   14  *    may be used to endorse or promote products derived from this software
   15  *    without specific prior written permission.
   16  *
   17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   27  * SUCH DAMAGE.
   28  *
   29  *      @(#)sys_socket.c        8.1 (Berkeley) 6/10/93
   30  * $FreeBSD: src/sys/kern/sys_socket.c,v 1.28.2.2 2001/02/26 04:23:16 jlemon Exp $
   31  */
   32 
   33 #include <sys/param.h>
   34 #include <sys/systm.h>
   35 #include <sys/file.h>
   36 #include <sys/lock.h>
   37 #include <sys/protosw.h>
   38 #include <sys/signalvar.h>
   39 #include <sys/socket.h>
   40 #include <sys/socketvar.h>
   41 #include <sys/socketops.h>
   42 #include <sys/filio.h>                  /* XXX */
   43 #include <sys/sockio.h>
   44 #include <sys/vnode.h>
   45 #include <sys/stat.h>
   46 #include <sys/uio.h>
   47 #include <sys/filedesc.h>
   48 #include <sys/ucred.h>
   49 
   50 #include <sys/socketvar2.h>
   51 
   52 #include <net/if.h>
   53 #include <net/route.h>
   54 
   55 struct  fileops socketops = {
   56         .fo_read = soo_read,
   57         .fo_write = soo_write,
   58         .fo_ioctl = soo_ioctl,
   59         .fo_kqfilter = sokqfilter,
   60         .fo_stat = soo_stat,
   61         .fo_close = soo_close,
   62         .fo_shutdown = soo_shutdown
   63 };
   64 
   65 /*
   66  * MPSAFE
   67  */
   68 int
   69 soo_read(struct file *fp, struct uio *uio, struct ucred *cred, int fflags)
   70 {
   71         struct socket *so;
   72         int error;
   73         int msgflags;
   74 
   75         atomic_set_int(&curthread->td_mpflags, TDF_MP_BATCH_DEMARC);
   76 
   77         so = (struct socket *)fp->f_data;
   78 
   79         if (fflags & O_FBLOCKING)
   80                 msgflags = 0;
   81         else if (fflags & O_FNONBLOCKING)
   82                 msgflags = MSG_FNONBLOCKING;
   83         else if (fp->f_flag & FNONBLOCK)
   84                 msgflags = MSG_FNONBLOCKING;
   85         else
   86                 msgflags = 0;
   87 
   88         error = so_pru_soreceive(so, NULL, uio, NULL, NULL, &msgflags);
   89         return (error);
   90 }
   91 
   92 /*
   93  * MPSAFE
   94  */
   95 int
   96 soo_write(struct file *fp, struct uio *uio, struct ucred *cred, int fflags)
   97 {
   98         struct socket *so;
   99         int error;
  100         int msgflags;
  101 
  102         so = (struct socket *)fp->f_data;
  103 
  104         if (fflags & O_FBLOCKING)
  105                 msgflags = 0;
  106         else if (fflags & O_FNONBLOCKING)
  107                 msgflags = MSG_FNONBLOCKING;
  108         else if (fp->f_flag & FNONBLOCK)
  109                 msgflags = MSG_FNONBLOCKING;
  110         else
  111                 msgflags = 0;
  112 
  113         error = so_pru_sosend(so, NULL, uio, NULL, NULL, msgflags, uio->uio_td);
  114         if (error == EPIPE && !(fflags & MSG_NOSIGNAL) &&
  115             !(so->so_options & SO_NOSIGPIPE) &&
  116             uio->uio_td->td_lwp) {
  117                 lwpsignal(uio->uio_td->td_proc, uio->uio_td->td_lwp, SIGPIPE);
  118         }
  119         return (error);
  120 }
  121 
  122 /*
  123  * MPSAFE
  124  */
  125 int
  126 soo_ioctl(struct file *fp, u_long cmd, caddr_t data,
  127           struct ucred *cred, struct sysmsg *msg)
  128 {
  129         struct socket *so;
  130         int error;
  131 
  132         so = (struct socket *)fp->f_data;
  133 
  134         switch (cmd) {
  135         case FIOASYNC:
  136                 if (*(int *)data) {
  137                         sosetstate(so, SS_ASYNC);
  138                         atomic_set_int(&so->so_rcv.ssb_flags,  SSB_ASYNC);
  139                         atomic_set_int(&so->so_snd.ssb_flags, SSB_ASYNC);
  140                 } else {
  141                         soclrstate(so, SS_ASYNC);
  142                         atomic_clear_int(&so->so_rcv.ssb_flags, SSB_ASYNC);
  143                         atomic_clear_int(&so->so_snd.ssb_flags, SSB_ASYNC);
  144                 }
  145                 error = 0;
  146                 break;
  147         case FIONREAD:
  148                 *(int *)data = so->so_rcv.ssb_cc;
  149                 error = 0;
  150                 break;
  151         case FIOSETOWN:
  152                 error = fsetown(*(int *)data, &so->so_sigio);
  153                 break;
  154         case FIOGETOWN:
  155                 *(int *)data = fgetown(&so->so_sigio);
  156                 error = 0;
  157                 break;
  158         case SIOCSPGRP:
  159                 error = fsetown(-(*(int *)data), &so->so_sigio);
  160                 break;
  161         case SIOCGPGRP:
  162                 *(int *)data = -fgetown(&so->so_sigio);
  163                 error = 0;
  164                 break;
  165         case SIOCATMARK:
  166                 *(int *)data = (so->so_state&SS_RCVATMARK) != 0;
  167                 error = 0;
  168                 break;
  169         default:
  170                 /*
  171                  * Interface/routing/protocol specific ioctls:
  172                  * interface and routing ioctls should have a
  173                  * different entry since a socket's unnecessary
  174                  */
  175                 if (IOCGROUP(cmd) == 'i') {
  176                         error = ifioctl(so, cmd, data, cred);
  177                 } else if (IOCGROUP(cmd) == 'r') {
  178                         error = rtioctl(cmd, data, cred);
  179                 } else {
  180                         error = so_pru_control_direct(so, cmd, data, NULL);
  181                 }
  182                 break;
  183         }
  184         return (error);
  185 }
  186 
  187 /*
  188  * MPSAFE
  189  */
  190 int
  191 soo_stat(struct file *fp, struct stat *ub, struct ucred *cred)
  192 {
  193         struct socket *so;
  194         int error;
  195 
  196         bzero((caddr_t)ub, sizeof (*ub));
  197         ub->st_mode = S_IFSOCK;
  198         so = (struct socket *)fp->f_data;
  199 
  200         /*
  201          * If SS_CANTRCVMORE is set, but there's still data left in the
  202          * receive buffer, the socket is still readable.
  203          */
  204         if ((so->so_state & SS_CANTRCVMORE) == 0 ||
  205             so->so_rcv.ssb_cc != 0)
  206                 ub->st_mode |= S_IRUSR | S_IRGRP | S_IROTH;
  207         if ((so->so_state & SS_CANTSENDMORE) == 0)
  208                 ub->st_mode |= S_IWUSR | S_IWGRP | S_IWOTH;
  209         ub->st_size = so->so_rcv.ssb_cc;
  210         ub->st_uid = so->so_cred->cr_uid;
  211         ub->st_gid = so->so_cred->cr_gid;
  212         error = so_pru_sense(so, ub);
  213         return (error);
  214 }
  215 
  216 /*
  217  * MPSAFE
  218  */
  219 int
  220 soo_close(struct file *fp)
  221 {
  222         int error;
  223 
  224         fp->f_ops = &badfileops;
  225         if (fp->f_data)
  226                 error = soclose((struct socket *)fp->f_data, fp->f_flag);
  227         else
  228                 error = 0;
  229         fp->f_data = NULL;
  230         return (error);
  231 }
  232 
  233 /*
  234  * MPSAFE
  235  */
  236 int
  237 soo_shutdown(struct file *fp, int how)
  238 {
  239         int error;
  240 
  241         if (fp->f_data)
  242                 error = soshutdown((struct socket *)fp->f_data, how);
  243         else
  244                 error = 0;
  245         return (error);
  246 }
  247

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

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sys/kern/sys_socket.c