From ef362818dff3e7dc437d90133424e9c9f0608a02 Mon Sep 17 00:00:00 2001 From: Joel Sherrill Date: Mon, 5 Dec 2016 21:06:40 -0600 Subject: Add support for posix_devctl() --- cpukit/libcsupport/src/posix_devctl.c | 72 +++++++++++++++++++++++++++++++++++ 1 file changed, 72 insertions(+) create mode 100644 cpukit/libcsupport/src/posix_devctl.c (limited to 'cpukit/libcsupport/src/posix_devctl.c') diff --git a/cpukit/libcsupport/src/posix_devctl.c b/cpukit/libcsupport/src/posix_devctl.c new file mode 100644 index 0000000000..9b86e0e059 --- /dev/null +++ b/cpukit/libcsupport/src/posix_devctl.c @@ -0,0 +1,72 @@ +/* + * Copyright (c) 2016 Joel Sherrill . 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. + */ + +#if HAVE_CONFIG_H +#include "config.h" +#endif + +#define _POSIX_26_C_SOURCE + +#include +#include +#include + +int posix_devctl( + int fd, + int dcmd, + void *restrict dev_data_ptr, + size_t nbyte, + int *restrict dev_info_ptr +) +{ + /* + * 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; + } + + return ioctl(fd, dcmd, dev_data_ptr); +} -- cgit v1.2.3