aboutsummaryrefslogtreecommitdiff
path: root/hurd/fopenport.c
blob: be6aa30c7efaa2cb0bba9746031a7cc4f4a20857 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
/* Copyright (C) 1994-2023 Free Software Foundation, Inc.
   This file is part of the GNU C Library.

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with the GNU C Library; if not, see
   <https://www.gnu.org/licenses/>.  */

#include <hurd.h>
#include <stdio.h>
#include <fcntl.h>
#include <string.h>

/* Read up to N chars into BUF from COOKIE.
   Return how many chars were read, 0 for EOF or -1 for error.  */
static ssize_t
readio (void *cookie, char *buf, size_t n)
{
  mach_msg_type_number_t nread;
  error_t err;
  char *bufp = buf;
  io_t io = (io_t) (uintptr_t) cookie;

  nread = n;
  if (err = __io_read (io, &bufp, &nread, -1, n))
    return __hurd_fail (err);

  if (bufp != buf)
    {
      memcpy (buf, bufp, nread);
      __vm_deallocate (__mach_task_self (),
		       (vm_address_t) bufp, (vm_size_t) nread);
    }

  return nread;
}

/* Write up to N chars from BUF to COOKIE.
   Return how many chars were written or -1 for error.  */
static ssize_t
writeio (void *cookie, const char *buf, size_t n)
{
  vm_size_t wrote;
  error_t err;
  io_t io = (io_t) (uintptr_t) cookie;

  if (err = __io_write (io, buf, n, -1, &wrote))
    return __hurd_fail (err);

  return wrote;
}

/* Move COOKIE's file position *POS bytes, according to WHENCE.
   The current file position is stored in *POS.
   Returns zero if successful, nonzero if not.  */
static int
seekio (void *cookie,
	off64_t *pos,
	int whence)
{
  io_t io = (io_t) (uintptr_t) cookie;
  error_t err = __io_seek (io, *pos, whence, pos);
  return err ? __hurd_fail (err) : 0;
}

/* Close the file associated with COOKIE.
   Return 0 for success or -1 for failure.  */
static int
closeio (void *cookie)
{
  io_t io = (io_t) (uintptr_t) cookie;
  error_t error = __mach_port_deallocate (__mach_task_self (),
					  io);
  if (error)
    return __hurd_fail (error);
  return 0;
}

#include "../libio/libioP.h"
#define fopencookie _IO_fopencookie
static const cookie_io_functions_t funcsio =
{ readio, writeio, seekio, closeio };


/* Open a stream on PORT.  MODE is as for fopen.  */

FILE *
__fopenport (mach_port_t port, const char *mode)
{
  int pflags;
  int needflags;
  error_t err;

  const char *m = mode;

  switch (*m++)
    {
    case 'r':
      needflags = O_READ;
      break;
    case 'w':
      needflags = O_WRITE;
      break;
    case 'a':
      needflags = O_WRITE|O_APPEND;
      break;
    default:
      return NULL;
  }
  if (m[0] == '+' || (m[0] == 'b' && m[1] == '+'))
    needflags |= O_RDWR;

  /* Verify the PORT is valid allows the access MODE specifies.  */

  if (err = __io_get_openmodes (port, &pflags))
    return __hurd_fail (err), NULL;

  /* Check the access mode.  */
  if ((pflags & needflags) != needflags)
    {
      errno = EBADF;
      return NULL;
    }

  return fopencookie ((void *) (uintptr_t) port,
                      mode, funcsio);
}
weak_alias (__fopenport, fopenport)