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

     /*
      * Copyright (c) 1982, 1986, 1990, 1993
      *      The Regents of the University of California.  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 the University of
     *      California, Berkeley and its contributors.
     * 4. Neither the name of the University nor the names of its contributors
     *    may be used to endorse or promote products derived from this software
     *    without specific prior written permission.
     *
     * THIS SOFTWARE IS PROVIDED BY THE REGENTS 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.
     *
     *      @(#)sys_socket.c        8.1 (Berkeley) 6/10/93
     * $FreeBSD$
     */
    
    #include <sys/param.h>
    #include <sys/systm.h>
    #include <sys/file.h>
    #include <sys/protosw.h>
    #include <sys/socket.h>
    #include <sys/socketvar.h>
    #include <sys/filio.h>                  /* XXX */
    #include <sys/sockio.h>
    #include <sys/stat.h>
    #include <sys/uio.h>
    #include <sys/filedesc.h>
    #include <sys/ucred.h>
    
    #include <net/if.h>
    #include <net/route.h>
    
    struct  fileops socketops = {
            soo_read, soo_write, soo_ioctl, soo_poll, sokqfilter,
            soo_stat, soo_close
    };
    
    /* ARGSUSED */
    int
    soo_read(fp, uio, cred, flags, p)
            struct file *fp;
            struct uio *uio;
            struct ucred *cred;
            struct proc *p;
            int flags;
    {
            struct socket *so = (struct socket *)fp->f_data;
            return so->so_proto->pr_usrreqs->pru_soreceive(so, 0, uio, 0, 0, 0);
    }
    
    /* ARGSUSED */
    int
    soo_write(fp, uio, cred, flags, p)
            struct file *fp;
            struct uio *uio;
            struct ucred *cred;
            struct proc *p;
            int flags;
    {
            struct socket *so = (struct socket *)fp->f_data;
            return so->so_proto->pr_usrreqs->pru_sosend(so, 0, uio, 0, 0, 0,
                                                        uio->uio_procp);
    }
    
    int
    soo_ioctl(fp, cmd, data, p)
            struct file *fp;
            u_long cmd;
            register caddr_t data;
            struct proc *p;
    {
            register struct socket *so = (struct socket *)fp->f_data;
    
            switch (cmd) {
    
            case FIONBIO:
                    if (*(int *)data)
                            so->so_state |= SS_NBIO;
                    else
                           so->so_state &= ~SS_NBIO;
                   return (0);
   
           case FIOASYNC:
                   if (*(int *)data) {
                           so->so_state |= SS_ASYNC;
                           so->so_rcv.sb_flags |= SB_ASYNC;
                           so->so_snd.sb_flags |= SB_ASYNC;
                   } else {
                           so->so_state &= ~SS_ASYNC;
                           so->so_rcv.sb_flags &= ~SB_ASYNC;
                           so->so_snd.sb_flags &= ~SB_ASYNC;
                   }
                   return (0);
   
           case FIONREAD:
                   *(int *)data = so->so_rcv.sb_cc;
                   return (0);
   
           case FIOSETOWN:
                   return (fsetown(*(int *)data, &so->so_sigio));
   
           case FIOGETOWN:
                   *(int *)data = fgetown(so->so_sigio);
                   return (0);
   
           case SIOCSPGRP:
                   return (fsetown(-(*(int *)data), &so->so_sigio));
   
           case SIOCGPGRP:
                   *(int *)data = -fgetown(so->so_sigio);
                   return (0);
   
           case SIOCATMARK:
                   *(int *)data = (so->so_state&SS_RCVATMARK) != 0;
                   return (0);
           }
           /*
            * Interface/routing/protocol specific ioctls:
            * interface and routing ioctls should have a
            * different entry since a socket's unnecessary
            */
           if (IOCGROUP(cmd) == 'i')
                   return (ifioctl(so, cmd, data, p));
           if (IOCGROUP(cmd) == 'r')
                   return (rtioctl(cmd, data, p));
           return ((*so->so_proto->pr_usrreqs->pru_control)(so, cmd, data, 0, p));
   }
   
   int
   soo_poll(fp, events, cred, p)
           struct file *fp;
           int events;
           struct ucred *cred;
           struct proc *p;
   {
           struct socket *so = (struct socket *)fp->f_data;
           return so->so_proto->pr_usrreqs->pru_sopoll(so, events, cred, p);
   }
   
   int
   soo_stat(fp, ub, p)
           struct file *fp;
           struct stat *ub;
           struct proc *p;
   {
           struct socket *so = (struct socket *)fp->f_data;
   
           bzero((caddr_t)ub, sizeof (*ub));
           ub->st_mode = S_IFSOCK;
           /*
            * If SS_CANTRCVMORE is set, but there's still data left in the
            * receive buffer, the socket is still readable.
            */
           if ((so->so_state & SS_CANTRCVMORE) == 0 ||
               so->so_rcv.sb_cc != 0)
                   ub->st_mode |= S_IRUSR | S_IRGRP | S_IROTH;
           if ((so->so_state & SS_CANTSENDMORE) == 0)
                   ub->st_mode |= S_IWUSR | S_IWGRP | S_IWOTH;
           ub->st_size = so->so_rcv.sb_cc;
           ub->st_uid = so->so_cred->cr_uid;
           ub->st_gid = so->so_cred->cr_gid;
           return ((*so->so_proto->pr_usrreqs->pru_sense)(so, ub));
   }
   
   /* ARGSUSED */
   int
   soo_close(fp, p)
           struct file *fp;
           struct proc *p;
   {
           int error = 0;
   
           fp->f_ops = &badfileops;
           if (fp->f_data)
                   error = soclose((struct socket *)fp->f_data);
           fp->f_data = 0;
           return (error);
   }

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