FreeBSD/Linux Kernel Cross Reference
sys/compat/svr4/svr4_filio.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_filio.c 280258 2015-03-19 13:37:36Z rwatson $");
    
    #include <sys/param.h>
    #include <sys/proc.h>
    #include <sys/systm.h>
    #include <sys/capsicum.h>
    #include <sys/file.h>
    #include <sys/filio.h>
    #include <sys/lock.h>
    #include <sys/signal.h>
    #include <sys/filedesc.h>
    #include <sys/poll.h>
    #include <sys/malloc.h>
    #include <sys/mutex.h>
    
    #include <sys/sysproto.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_ioctl.h>
    #include <compat/svr4/svr4_filio.h>
    
    /*#define GROTTY_READ_HACK*/
    
    int
    svr4_sys_poll(td, uap)
         struct thread *td;
         struct svr4_sys_poll_args *uap;
    {
         int error;
         struct poll_args pa;
         struct pollfd *pfd;
         int idx = 0, cerr;
         u_long siz;
    
         if (uap->nfds > maxfilesperproc && uap->nfds > FD_SETSIZE)
           return (EINVAL);
    
         pa.fds = uap->fds;
         pa.nfds = uap->nfds;
         pa.timeout = uap->timeout;
    
         siz = uap->nfds * sizeof(struct pollfd);
         pfd = (struct pollfd *)malloc(siz, M_TEMP, M_WAITOK);
    
         error = sys_poll(td, (struct poll_args *)uap);
    
         if ((cerr = copyin(uap->fds, pfd, siz)) != 0) {
           error = cerr;
           goto done;
         }
    
         for (idx = 0; idx < uap->nfds; idx++) {
           /* POLLWRNORM already equals POLLOUT, so we don't worry about that */
           if (pfd[idx].revents & (POLLOUT | POLLWRNORM | POLLWRBAND))
                pfd[idx].revents |= (POLLOUT | POLLWRNORM | POLLWRBAND);
         }
         if ((cerr = copyout(pfd, uap->fds, siz)) != 0) {
           error = cerr;
           goto done;   /* yeah, I know it's the next line, but this way I won't
                           forget to update it if I add more code */
         }
    done:
         free(pfd, M_TEMP);
         return error;
    }
    
   #if defined(READ_TEST)
   int
   svr4_sys_read(td, uap)
        struct thread *td;
        struct svr4_sys_read_args *uap;
   {
        struct read_args ra;
        cap_rights_t rights;
        struct file *fp;
        struct socket *so = NULL;
        int so_state;
        sigset_t sigmask;
        int rv;
   
        ra.fd = uap->fd;
        ra.buf = uap->buf;
        ra.nbyte = uap->nbyte;
   
        if (fget(td, uap->fd, cap_rights_init(&rights, CAP_READ), &fp) != 0) {
          DPRINTF(("Something fishy with the user-supplied file descriptor...\n"));
          return EBADF;
        }
   
        if (fp->f_type == DTYPE_SOCKET) {
          so = fp->f_data;
          DPRINTF(("fd %d is a socket\n", uap->fd));
          if (so->so_state & SS_ASYNC) {
            DPRINTF(("fd %d is an ASYNC socket!\n", uap->fd));
          }
          DPRINTF(("Here are its flags: 0x%x\n", so->so_state));
   #if defined(GROTTY_READ_HACK)
          so_state = so->so_state;
          so->so_state &= ~SS_NBIO;
   #endif
        }
   
        rv = read(td, &ra);
   
        DPRINTF(("svr4_read(%d, 0x%0x, %d) = %d\n", 
                uap->fd, uap->buf, uap->nbyte, rv));
        if (rv == EAGAIN) {
   #ifdef DEBUG_SVR4
          struct sigacts *ps;
   
          PROC_LOCK(td->td_proc);
          ps = td->td_proc->p_sigacts;
          mtx_lock(&ps->ps_mtx);
   #endif
          DPRINTF(("sigmask = 0x%x\n", td->td_sigmask));
          DPRINTF(("sigignore = 0x%x\n", ps->ps_sigignore));
          DPRINTF(("sigcaught = 0x%x\n", ps->ps_sigcatch));
          DPRINTF(("siglist = 0x%x\n", td->td_siglist));
   #ifdef DEBUG_SVR4
          mtx_unlock(&ps->ps_mtx);
          PROC_UNLOCK(td->td_proc);
   #endif
        }
   
   #if defined(GROTTY_READ_HACK)
        if (so) {  /* We've already checked to see if this is a socket */
          so->so_state = so_state;
        }
   #endif
        fdrop(fp, td);
   
        return(rv);
   }
   #endif /* READ_TEST */
   
   #if defined(BOGUS)
   int
   svr4_sys_write(td, uap)
        struct thread *td;
        struct svr4_sys_write_args *uap;
   {
        struct write_args wa;
        struct file *fp;
        int rv;
   
        wa.fd = uap->fd;
        wa.buf = uap->buf;
        wa.nbyte = uap->nbyte;
   
        rv = write(td, &wa);
   
        DPRINTF(("svr4_write(%d, 0x%0x, %d) = %d\n", 
                uap->fd, uap->buf, uap->nbyte, rv));
   
        return(rv);
   }
   #endif /* BOGUS */
   
   int
   svr4_fil_ioctl(fp, td, retval, fd, cmd, data)
           struct file *fp;
           struct thread *td;
           register_t *retval;
           int fd;
           u_long cmd;
           caddr_t data;
   {
           struct filedesc *fdp = td->td_proc->p_fd;
           struct filedescent *fde;
           int error, num;
   
           *retval = 0;
   
           switch (cmd) {
           case SVR4_FIOCLEX:
                   FILEDESC_XLOCK(fdp);
                   fde = &fdp->fd_ofiles[fd];
                   fde->fde_flags |= UF_EXCLOSE;
                   FILEDESC_XUNLOCK(fdp);
                   return 0;
   
           case SVR4_FIONCLEX:
                   FILEDESC_XLOCK(fdp);
                   fde = &fdp->fd_ofiles[fd];
                   fde->fde_flags &= ~UF_EXCLOSE;
                   FILEDESC_XUNLOCK(fdp);
                   return 0;
   
           case SVR4_FIOGETOWN:
           case SVR4_FIOSETOWN:
           case SVR4_FIOASYNC:
           case SVR4_FIONBIO:
           case SVR4_FIONREAD:
                   if ((error = copyin(data, &num, sizeof(num))) != 0)
                           return error;
   
                   switch (cmd) {
                   case SVR4_FIOGETOWN:    cmd = FIOGETOWN; break;
                   case SVR4_FIOSETOWN:    cmd = FIOSETOWN; break;
                   case SVR4_FIOASYNC:     cmd = FIOASYNC;  break;
                   case SVR4_FIONBIO:      cmd = FIONBIO;   break;
                   case SVR4_FIONREAD:     cmd = FIONREAD;  break;
                   }
   
   #ifdef SVR4_DEBUG
                   if (cmd == FIOASYNC) DPRINTF(("FIOASYNC\n"));
   #endif
                   error = fo_ioctl(fp, cmd, (caddr_t) &num, td->td_ucred, td);
   
                   if (error)
                           return error;
   
                   return copyout(&num, data, sizeof(num));
   
           default:
                   DPRINTF(("Unknown svr4 filio %lx\n", cmd));
                   return 0;       /* ENOSYS really */
           }
   }

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