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glibc/hurd/fopenport.c
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/* Copyright (C) 1994-2016 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 | |
<http://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; | |
nread = n; | |
if (err = __io_read ((io_t) cookie, &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) | |
{ | |
mach_msg_type_number_t wrote; | |
error_t err; | |
if (err = __io_write ((io_t) cookie, 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, | |
_IO_off64_t *pos, | |
int whence) | |
{ | |
error_t err = __io_seek ((file_t) cookie, *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) | |
{ | |
error_t error = __mach_port_deallocate (__mach_task_self (), | |
(mach_port_t) cookie); | |
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 *) port, mode, funcsio); | |
} | |
weak_alias (__fopenport, fopenport) |