File: [local] / prex / usr / lib / posix / file / ioctl.c (download)
Revision 1.1.1.1 (vendor branch), Tue Aug 19 12:47:00 2008 UTC (16 years ago) by nbrk
Branch: MAIN, KOHSUKE
CVS Tags: PREX_0_8_BASE, HEAD Changes since 1.1: +0 -0 lines
Initial import of Prex, Portable Real-time Embedded POSIX microkernel system.
I have totally new directions in my development (more focused on real hardware, not virtual one).
Old hacks are available in prex-old module. They will be carefully re-designed and merged soon.
|
/*
* Copyright (c) 2007, Kohsuke Ohtani
* 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.
* 3. Neither the name of the author nor the names of any co-contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* 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.
*/
#include <prex/prex.h>
#include <prex/posix.h>
#include <server/fs.h>
#include <sys/ioctl.h>
#include <errno.h>
#include <stdarg.h>
#include <string.h>
int
ioctl(int fd, unsigned long request, ...)
{
struct ioctl_msg m;
char *argp;
va_list args;
size_t size;
struct stat st;
int err;
va_start(args, request);
argp = va_arg(args, char *);
va_end(args);
size = IOCPARM_LEN(request);
if (size > IOCPARM_MAX) {
errno = ENOTTY;
return -1;
}
if (fstat(fd, &st) == -1)
return -1;
if (S_ISCHR(st.st_mode) || S_ISBLK(st.st_mode)) {
/*
* Note: The file system server can not handle the
* poniter type arguent for ioctl(). So, we have to
* invoke the ioctl here if the target file is a device.
*/
err = device_ioctl(st.st_rdev, request, argp);
if (err != 0) {
errno = err;
return -1;
}
return 0;
}
/*
* Note:
* We can not know if the argument is pointer or int value.
* So, if it is an input request and its length is sizeof(int),
* we handle it as direct value.
*/
if (((request & IOC_DIRMASK) == IOC_IN) && (size == sizeof(int)))
*((int *)m.buf) = (int)argp;
else if ((request & IOC_IN) && size && argp)
memcpy(&m.buf, argp, size);
m.hdr.code = FS_IOCTL;
m.fd = fd;
m.request = request;
if (__posix_call(__fs_obj, &m, sizeof(m), 0) != 0)
return -1;
if ((request & IOC_OUT) && size && argp)
memcpy(argp, &m.buf, size);
return 0;
}