The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/svr4/svr4_filio.c

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    1 /*
    2  * Copyright (c) 1998 Mark Newton
    3  * Copyright (c) 1994 Christos Zoulas
    4  * All rights reserved.
    5  *
    6  * Redistribution and use in source and binary forms, with or without
    7  * modification, are permitted provided that the following conditions
    8  * are met:
    9  * 1. Redistributions of source code must retain the above copyright
   10  *    notice, this list of conditions and the following disclaimer.
   11  * 2. Redistributions in binary form must reproduce the above copyright
   12  *    notice, this list of conditions and the following disclaimer in the
   13  *    documentation and/or other materials provided with the distribution.
   14  * 3. The name of the author may not be used to endorse or promote products
   15  *    derived from this software without specific prior written permission
   16  *
   17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   18  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   19  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   20  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   21  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   22  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   23  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   24  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   25  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   26  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   27  * 
   28  * $FreeBSD: src/sys/svr4/svr4_filio.c,v 1.8 2000/01/15 15:30:44 newton Exp $
   29  */
   30 
   31 #include <sys/param.h>
   32 #include <sys/proc.h>
   33 #include <sys/systm.h>
   34 #include <sys/file.h>
   35 #include <sys/filio.h>
   36 #include <sys/signal.h>
   37 #include <sys/filedesc.h>
   38 #include <sys/poll.h>
   39 #include <sys/malloc.h>
   40 
   41 #include <sys/sysproto.h>
   42 
   43 #include <svr4/svr4.h>
   44 #include <svr4/svr4_types.h>
   45 #include <svr4/svr4_util.h>
   46 #include <svr4/svr4_signal.h>
   47 #include <svr4/svr4_proto.h>
   48 #include <svr4/svr4_ioctl.h>
   49 #include <svr4/svr4_filio.h>
   50 
   51 /*#define GROTTY_READ_HACK*/
   52 
   53 int
   54 svr4_sys_poll(p, uap)
   55      struct proc *p;
   56      struct svr4_sys_poll_args *uap;
   57 {
   58      int error;
   59      struct poll_args pa;
   60      struct pollfd *pfd;
   61      int idx = 0, cerr;
   62      u_long siz;
   63 
   64      SCARG(&pa, fds) = SCARG(uap, fds);
   65      SCARG(&pa, nfds) = SCARG(uap, nfds);
   66      SCARG(&pa, timeout) = SCARG(uap, timeout);
   67 
   68      siz = SCARG(uap, nfds) * sizeof(struct pollfd);
   69      pfd = (struct pollfd *)malloc(siz, M_TEMP, M_WAITOK);
   70 
   71      error = poll(p, (struct poll_args *)uap);
   72 
   73      if ((cerr = copyin(SCARG(uap, fds), pfd, siz)) != 0) {
   74        error = cerr;
   75        goto done;
   76      }
   77 
   78      for (idx = 0; idx < SCARG(uap, nfds); idx++) {
   79        /* POLLWRNORM already equals POLLOUT, so we don't worry about that */
   80        if (pfd[idx].revents & (POLLOUT | POLLWRNORM | POLLWRBAND))
   81             pfd[idx].revents |= (POLLOUT | POLLWRNORM | POLLWRBAND);
   82      }
   83      if ((cerr = copyout(pfd, SCARG(uap, fds), siz)) != 0) {
   84        error = cerr;
   85        goto done;   /* yeah, I know it's the next line, but this way I won't
   86                        forget to update it if I add more code */
   87      }
   88 done:
   89      free(pfd, M_TEMP);
   90      return error;
   91 }
   92 
   93 #if defined(READ_TEST)
   94 int
   95 svr4_sys_read(p, uap)
   96      struct proc *p;
   97      struct svr4_sys_read_args *uap;
   98 {
   99      struct read_args ra;
  100      struct filedesc *fdp = p->p_fd;
  101      struct file *fp;
  102      struct socket *so = NULL;
  103      int so_state;
  104      sigset_t sigmask;
  105      int rv;
  106 
  107      SCARG(&ra, fd) = SCARG(uap, fd);
  108      SCARG(&ra, buf) = SCARG(uap, buf);
  109      SCARG(&ra, nbyte) = SCARG(uap, nbyte);
  110 
  111      if ((fp = fdp->fd_ofiles[SCARG(uap, fd)]) == NULL) {
  112        DPRINTF(("Something fishy with the user-supplied file descriptor...\n"));
  113        return EBADF;
  114      }
  115 
  116      if (fp->f_type == DTYPE_SOCKET) {
  117        so = (struct socket *)fp->f_data;
  118        DPRINTF(("fd %d is a socket\n", SCARG(uap, fd)));
  119        if (so->so_state & SS_ASYNC) {
  120          DPRINTF(("fd %d is an ASYNC socket!\n", SCARG(uap, fd)));
  121        }
  122        DPRINTF(("Here are its flags: 0x%x\n", so->so_state));
  123 #if defined(GROTTY_READ_HACK)
  124        so_state = so->so_state;
  125        so->so_state &= ~SS_NBIO;
  126 #endif
  127      }
  128 
  129      rv = read(p, &ra);
  130 
  131      DPRINTF(("svr4_read(%d, 0x%0x, %d) = %d\n", 
  132              SCARG(uap, fd), SCARG(uap, buf), SCARG(uap, nbyte), rv));
  133      if (rv == EAGAIN) {
  134        DPRINTF(("sigmask = 0x%x\n", p->p_sigmask));
  135        DPRINTF(("sigignore = 0x%x\n", p->p_sigignore));
  136        DPRINTF(("sigcaught = 0x%x\n", p->p_sigcatch));
  137        DPRINTF(("siglist = 0x%x\n", p->p_siglist));
  138      }
  139 
  140 #if defined(GROTTY_READ_HACK)
  141      if (so) {  /* We've already checked to see if this is a socket */
  142        so->so_state = so_state;
  143      }
  144 #endif
  145 
  146      return(rv);
  147 }
  148 #endif /* READ_TEST */
  149 
  150 #if defined(BOGUS)
  151 int
  152 svr4_sys_write(p, uap)
  153      struct proc *p;
  154      struct svr4_sys_write_args *uap;
  155 {
  156      struct write_args wa;
  157      struct filedesc *fdp;
  158      struct file *fp;
  159      int rv;
  160 
  161      SCARG(&wa, fd) = SCARG(uap, fd);
  162      SCARG(&wa, buf) = SCARG(uap, buf);
  163      SCARG(&wa, nbyte) = SCARG(uap, nbyte);
  164 
  165      rv = write(p, &wa);
  166 
  167      DPRINTF(("svr4_write(%d, 0x%0x, %d) = %d\n", 
  168              SCARG(uap, fd), SCARG(uap, buf), SCARG(uap, nbyte), rv));
  169 
  170      return(rv);
  171 }
  172 #endif /* BOGUS */
  173 
  174 int
  175 svr4_fil_ioctl(fp, p, retval, fd, cmd, data)
  176         struct file *fp;
  177         struct proc *p;
  178         register_t *retval;
  179         int fd;
  180         u_long cmd;
  181         caddr_t data;
  182 {
  183         int error;
  184         int num;
  185         struct filedesc *fdp = p->p_fd;
  186 
  187         *retval = 0;
  188 
  189         switch (cmd) {
  190         case SVR4_FIOCLEX:
  191                 fdp->fd_ofileflags[fd] |= UF_EXCLOSE;
  192                 return 0;
  193 
  194         case SVR4_FIONCLEX:
  195                 fdp->fd_ofileflags[fd] &= ~UF_EXCLOSE;
  196                 return 0;
  197 
  198         case SVR4_FIOGETOWN:
  199         case SVR4_FIOSETOWN:
  200         case SVR4_FIOASYNC:
  201         case SVR4_FIONBIO:
  202         case SVR4_FIONREAD:
  203                 if ((error = copyin(data, &num, sizeof(num))) != 0)
  204                         return error;
  205 
  206                 switch (cmd) {
  207                 case SVR4_FIOGETOWN:    cmd = FIOGETOWN; break;
  208                 case SVR4_FIOSETOWN:    cmd = FIOSETOWN; break;
  209                 case SVR4_FIOASYNC:     cmd = FIOASYNC;  break;
  210                 case SVR4_FIONBIO:      cmd = FIONBIO;   break;
  211                 case SVR4_FIONREAD:     cmd = FIONREAD;  break;
  212                 }
  213 
  214 #ifdef SVR4_DEBUG
  215                 if (cmd == FIOASYNC) DPRINTF(("FIOASYNC\n"));
  216 #endif
  217                 error = fo_ioctl(fp, cmd, (caddr_t) &num, p);
  218 
  219                 if (error)
  220                         return error;
  221 
  222                 return copyout(&num, data, sizeof(num));
  223 
  224         default:
  225                 DPRINTF(("Unknown svr4 filio %lx\n", cmd));
  226                 return 0;       /* ENOSYS really */
  227         }
  228 }

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