FreeBSD/Linux Kernel Cross Reference
sys/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.
     * 
     * $FreeBSD$
     */
    
    #include <sys/param.h>
    #include <sys/proc.h>
    #include <sys/systm.h>
    #include <sys/file.h>
    #include <sys/filio.h>
    #include <sys/signal.h>
    #include <sys/filedesc.h>
    #include <sys/poll.h>
    #include <sys/malloc.h>
    
    #include <sys/sysproto.h>
    
    #include <svr4/svr4.h>
    #include <svr4/svr4_types.h>
    #include <svr4/svr4_util.h>
    #include <svr4/svr4_signal.h>
    #include <svr4/svr4_proto.h>
    #include <svr4/svr4_ioctl.h>
    #include <svr4/svr4_filio.h>
    
    /*#define GROTTY_READ_HACK*/
    
    int
    svr4_sys_poll(p, uap)
         struct proc *p;
         struct svr4_sys_poll_args *uap;
    {
         int error;
         struct poll_args pa;
         struct pollfd *pfd;
         int idx = 0, cerr;
         u_long siz;
    
         SCARG(&pa, fds) = SCARG(uap, fds);
         SCARG(&pa, nfds) = SCARG(uap, nfds);
         SCARG(&pa, timeout) = SCARG(uap, timeout);
    
         siz = SCARG(uap, nfds) * sizeof(struct pollfd);
         pfd = (struct pollfd *)malloc(siz, M_TEMP, M_WAITOK);
    
         error = poll(p, (struct poll_args *)uap);
    
         if ((cerr = copyin(SCARG(uap, fds), pfd, siz)) != 0) {
           error = cerr;
           goto done;
         }
    
         for (idx = 0; idx < SCARG(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, SCARG(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(p, uap)
         struct proc *p;
         struct svr4_sys_read_args *uap;
    {
         struct read_args ra;
        struct filedesc *fdp = p->p_fd;
        struct file *fp;
        struct socket *so = NULL;
        int so_state;
        sigset_t sigmask;
        int rv;
   
        SCARG(&ra, fd) = SCARG(uap, fd);
        SCARG(&ra, buf) = SCARG(uap, buf);
        SCARG(&ra, nbyte) = SCARG(uap, nbyte);
   
        if ((fp = fdp->fd_ofiles[SCARG(uap, fd)]) == NULL) {
          DPRINTF(("Something fishy with the user-supplied file descriptor...\n"));
          return EBADF;
        }
   
        if (fp->f_type == DTYPE_SOCKET) {
          so = (struct socket *)fp->f_data;
          DPRINTF(("fd %d is a socket\n", SCARG(uap, fd)));
          if (so->so_state & SS_ASYNC) {
            DPRINTF(("fd %d is an ASYNC socket!\n", SCARG(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(p, &ra);
   
        DPRINTF(("svr4_read(%d, 0x%0x, %d) = %d\n", 
                SCARG(uap, fd), SCARG(uap, buf), SCARG(uap, nbyte), rv));
        if (rv == EAGAIN) {
          DPRINTF(("sigmask = 0x%x\n", p->p_sigmask));
          DPRINTF(("sigignore = 0x%x\n", p->p_sigignore));
          DPRINTF(("sigcaught = 0x%x\n", p->p_sigcatch));
          DPRINTF(("siglist = 0x%x\n", p->p_siglist));
        }
   
   #if defined(GROTTY_READ_HACK)
        if (so) {  /* We've already checked to see if this is a socket */
          so->so_state = so_state;
        }
   #endif
   
        return(rv);
   }
   #endif /* READ_TEST */
   
   #if defined(BOGUS)
   int
   svr4_sys_write(p, uap)
        struct proc *p;
        struct svr4_sys_write_args *uap;
   {
        struct write_args wa;
        struct filedesc *fdp;
        struct file *fp;
        int rv;
   
        SCARG(&wa, fd) = SCARG(uap, fd);
        SCARG(&wa, buf) = SCARG(uap, buf);
        SCARG(&wa, nbyte) = SCARG(uap, nbyte);
   
        rv = write(p, &wa);
   
        DPRINTF(("svr4_write(%d, 0x%0x, %d) = %d\n", 
                SCARG(uap, fd), SCARG(uap, buf), SCARG(uap, nbyte), rv));
   
        return(rv);
   }
   #endif /* BOGUS */
   
   int
   svr4_fil_ioctl(fp, p, retval, fd, cmd, data)
           struct file *fp;
           struct proc *p;
           register_t *retval;
           int fd;
           u_long cmd;
           caddr_t data;
   {
           int error;
           int num;
           struct filedesc *fdp = p->p_fd;
   
           *retval = 0;
   
           switch (cmd) {
           case SVR4_FIOCLEX:
                   fdp->fd_ofileflags[fd] |= UF_EXCLOSE;
                   return 0;
   
           case SVR4_FIONCLEX:
                   fdp->fd_ofileflags[fd] &= ~UF_EXCLOSE;
                   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, p);
   
                   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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