/*
* Copyright (c) 2016, 2020 Joel Sherrill <joel@rtems.org>.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#define _POSIX_26_C_SOURCE
#include <devctl.h>
#include <sys/ioctl.h>
#include <rtems/seterr.h>
#include <unistd.h>
#include <fcntl.h>
int posix_devctl(
int fd,
int dcmd,
void *__restrict dev_data_ptr,
size_t nbyte,
int *__restrict dev_info_ptr
)
{
int rv = 0;
/*
* posix_devctl() is supposed to return an errno. errno needs to be
* preserved in spite of calling methods (e.g., close, fcntl, and ioctl)
* that set it.
*/
int errno_copy = errno;
/*
* The POSIX 1003.26 standard allows for library implementations
* that implement posix_devctl() using ioctl(). In this case,
* the extra parameters are largely ignored.
*
* The FACE Technical Standard requires only that FIONBIO
* be supported for sockets.
*
* This method appears to be rarely implemented and there are
* no known required use cases for this method beyond those
* from the FACE Technical Standard.
*/
/*
* POSIX 1003.26 mentions that nbyte must be non-negative but this
* doesn't make sense because size_t is guaranteed to be unsigned.
*/
/*
* Since this is implemented on top of ioctl(), the device information
* is not going to be passed down. Fill it in with zero so the behavior
* is defined.
*/
if (dev_info_ptr != NULL) {
*dev_info_ptr = 0;
}
/*
*
*/
switch (dcmd) {
/*
* The FACE Technical Standard Edition 3.0 and newer requires the SOCKCLOSE
* ioctl command. This is because the Security Profile does not include
* close() and applications need a way to close sockets. Closing sockets is
* a minimum requirement so using close() in the implementation meets that
* requirement but also lets the application close other file types.
*/
case SOCKCLOSE:
if (close(fd) != 0) {
rv = errno;
errno = errno_copy;
return rv;
}
break;
/*
* The FACE Technical Standard Edition 3.0 and newer requires the
* posix_devctl command to support the FIONBIO subcommand.
*/
case FIONBIO: {
int tmp_flag;
int flag;
if (nbyte != sizeof(int)) {
return EINVAL;
}
tmp_flag = fcntl(fd, F_GETFL, 0);
if (tmp_flag == -1) {
rv = errno;
errno = errno_copy;
return rv;
}
flag = *(int *)dev_data_ptr;
if (flag != 0) {
tmp_flag |= O_NONBLOCK;
} else {
tmp_flag &= ~O_NONBLOCK;
}
(void) fcntl(fd, F_SETFL, tmp_flag);
break;
}
default:
if (ioctl(fd, dcmd, dev_data_ptr) != 0) {
rv = errno;
errno = errno_copy;
return rv;
}
break;
}
errno = errno_copy;
return rv;
}
