FreeBSD/Linux Kernel Cross Reference
sys/compat/svr4/svr4_ioctl.c

     /*-
      * Copyright (c) 1998 Mark Newton
      * Copyright (c) 1994 Christos Zoulas
      * 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. The name of the author may not be used to endorse or promote products
     *    derived from this software without specific prior written permission
     *
     * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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 <sys/cdefs.h>
    __FBSDID("$FreeBSD: releng/10.4/sys/compat/svr4/svr4_ioctl.c 280258 2015-03-19 13:37:36Z rwatson $");
    
    #include <sys/param.h>
    #include <sys/proc.h>
    #include <sys/capsicum.h>
    #include <sys/file.h>
    #include <sys/filedesc.h>
    #include <sys/fcntl.h>
    #include <sys/socket.h>
    #include <sys/socketvar.h>
    #include <sys/systm.h>
    
    #include <compat/svr4/svr4.h>
    #include <compat/svr4/svr4_types.h>
    #include <compat/svr4/svr4_util.h>
    #include <compat/svr4/svr4_signal.h>
    #include <compat/svr4/svr4_proto.h>
    #include <compat/svr4/svr4_stropts.h>
    #include <compat/svr4/svr4_ioctl.h>
    #include <compat/svr4/svr4_termios.h>
    #include <compat/svr4/svr4_filio.h>
    #include <compat/svr4/svr4_sockio.h>
    
    #ifdef DEBUG_SVR4
    static void svr4_decode_cmd(u_long, char *, char *, int *, int *);
    /*
     * Decode an ioctl command symbolically
     */
    static void
    svr4_decode_cmd(cmd, dir, c, num, argsiz)
            u_long            cmd;
            char             *dir, *c;
            int              *num, *argsiz;
    {
            if (cmd & SVR4_IOC_VOID)
                    *dir++ = 'V';
            if (cmd & SVR4_IOC_IN)
                    *dir++ = 'R';
            if (cmd & SVR4_IOC_OUT)
                    *dir++ = 'W';
            *dir = '\0';
            if (cmd & SVR4_IOC_INOUT)
                    *argsiz = (cmd >> 16) & 0xff;
            else
                    *argsiz = -1;
    
            *c = (cmd >> 8) & 0xff;
            *num = cmd & 0xff;
    }
    #endif
    
    int
    svr4_sys_ioctl(td, uap)
            struct thread *td;
            struct svr4_sys_ioctl_args *uap;
    {
            int             *retval;
            cap_rights_t     rights;
            struct file     *fp;
            u_long           cmd;
            int (*fun)(struct file *, struct thread *, register_t *,
                            int, u_long, caddr_t);
            int error;
    #ifdef DEBUG_SVR4
            char             dir[4];
            char             c;
            int              num;
            int              argsiz;
    
            svr4_decode_cmd(uap->com, dir, &c, &num, &argsiz);
   
           DPRINTF(("svr4_ioctl[%lx](%d, _IO%s(%c, %d, %d), %p);\n", uap->com, uap->fd,
               dir, c, num, argsiz, uap->data));
   #endif
           retval = td->td_retval;
           cmd = uap->com;
   
           error = fget(td, uap->fd, cap_rights_init(&rights, CAP_IOCTL), &fp);
           if (error != 0)
                   return (error);
   
           if ((fp->f_flag & (FREAD | FWRITE)) == 0) {
                   fdrop(fp, td);
                   return EBADF;
           }
   
   #if defined(DEBUG_SVR4)
           if (fp->f_type == DTYPE_SOCKET) {
                   struct socket *so = fp->f_data;
                   DPRINTF(("<<< IN: so_state = 0x%x\n", so->so_state));
           }
   #endif
   
           switch (cmd & 0xff00) {
           case SVR4_TIOC:
                   DPRINTF(("term\n"));
                   fun = svr4_term_ioctl;
                   break;
   
           case SVR4_STR:
                   DPRINTF(("stream\n"));
                   fun = svr4_stream_ioctl;
                   break;
   
           case SVR4_FIOC:
                   DPRINTF(("file\n"));
                   fun = svr4_fil_ioctl;
                   break;
   
           case SVR4_SIOC:
                   DPRINTF(("socket\n"));
                   fun = svr4_sock_ioctl;
                   break;
   
           case SVR4_XIOC:
                   /* We do not support those */
                   fdrop(fp, td);
                   return EINVAL;
   
           default:
                   fdrop(fp, td);
                   DPRINTF(("Unimplemented ioctl %lx\n", cmd));
                   return 0;       /* XXX: really ENOSYS */
           }
   #if defined(DEBUG_SVR4)
           if (fp->f_type == DTYPE_SOCKET) {
                   struct socket *so;
   
                   so = fp->f_data;
                   DPRINTF((">>> OUT: so_state = 0x%x\n", so->so_state));
           }
   #endif
           error = (*fun)(fp, td, retval, uap->fd, cmd, uap->data);
           fdrop(fp, td);
           return (error);
   }

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