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/* 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)
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