Blame hurd/fopenport.c

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/* Copyright (C) 1994-2018 Free Software Foundation, Inc.
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   This file is part of the GNU C Library.
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   The GNU C Library is free software; you can redistribute it and/or
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   modify it under the terms of the GNU Lesser General Public
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   License as published by the Free Software Foundation; either
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   version 2.1 of the License, or (at your option) any later version.
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   The GNU C Library is distributed in the hope that it will be useful,
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   but WITHOUT ANY WARRANTY; without even the implied warranty of
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   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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   Lesser General Public License for more details.
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   You should have received a copy of the GNU Lesser General Public
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   License along with the GNU C Library; if not, see
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   <http://www.gnu.org/licenses/>.  */
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#include <hurd.h>
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#include <stdio.h>
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#include <fcntl.h>
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#include <string.h>
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/* Read up to N chars into BUF from COOKIE.
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   Return how many chars were read, 0 for EOF or -1 for error.  */
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static ssize_t
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readio (void *cookie, char *buf, size_t n)
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{
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  mach_msg_type_number_t nread;
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  error_t err;
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  char *bufp = buf;
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  nread = n;
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  if (err = __io_read ((io_t) cookie, &bufp, &nread, -1, n))
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    return __hurd_fail (err);
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  if (bufp != buf)
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    {
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      memcpy (buf, bufp, nread);
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      __vm_deallocate (__mach_task_self (),
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		       (vm_address_t) bufp, (vm_size_t) nread);
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    }
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  return nread;
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}
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/* Write up to N chars from BUF to COOKIE.
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   Return how many chars were written or -1 for error.  */
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static ssize_t
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writeio (void *cookie, const char *buf, size_t n)
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{
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  mach_msg_type_number_t wrote;
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  error_t err;
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  if (err = __io_write ((io_t) cookie, buf, n, -1, &wrote))
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    return __hurd_fail (err);
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  return wrote;
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}
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/* Move COOKIE's file position *POS bytes, according to WHENCE.
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   The current file position is stored in *POS.
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   Returns zero if successful, nonzero if not.  */
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static int
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seekio (void *cookie,
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	off64_t *pos,
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	int whence)
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{
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  error_t err = __io_seek ((file_t) cookie, *pos, whence, pos);
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  return err ? __hurd_fail (err) : 0;
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}
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/* Close the file associated with COOKIE.
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   Return 0 for success or -1 for failure.  */
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static int
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closeio (void *cookie)
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{
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  error_t error = __mach_port_deallocate (__mach_task_self (),
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					  (mach_port_t) cookie);
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  if (error)
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    return __hurd_fail (error);
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  return 0;
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}
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#include "../libio/libioP.h"
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#define fopencookie _IO_fopencookie
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static const cookie_io_functions_t funcsio =
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{ readio, writeio, seekio, closeio };
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/* Open a stream on PORT.  MODE is as for fopen.  */
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FILE *
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__fopenport (mach_port_t port, const char *mode)
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{
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  int pflags;
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  int needflags;
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  error_t err;
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  const char *m = mode;
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  switch (*m++)
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    {
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    case 'r':
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      needflags = O_READ;
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      break;
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    case 'w':
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      needflags = O_WRITE;
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      break;
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    case 'a':
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      needflags = O_WRITE|O_APPEND;
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      break;
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    default:
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      return NULL;
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  }
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  if (m[0] == '+' || (m[0] == 'b' && m[1] == '+'))
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    needflags |= O_RDWR;
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  /* Verify the PORT is valid allows the access MODE specifies.  */
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  if (err = __io_get_openmodes (port, &pflags))
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    return __hurd_fail (err), NULL;
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  /* Check the access mode.  */
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  if ((pflags & needflags) != needflags)
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    {
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      errno = EBADF;
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      return NULL;
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    }
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  return fopencookie ((void *) port, mode, funcsio);
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}
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weak_alias (__fopenport, fopenport)