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root/usr/lib/posix/file/ioctl.c

DEFINITIONS

1. ioctl

   1 /*
   2  * Copyright (c) 2007, Kohsuke Ohtani
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. Neither the name of the author nor the names of any co-contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  */
  30 #include <sys/prex.h>
  31 #include <sys/posix.h>
  32 #include <ipc/fs.h>
  33 #include <sys/ioctl.h>
  35 #include <errno.h>
  36 #include <stdarg.h>
  37 #include <string.h>
  39 int
ioctl(int fd, unsigned long cmd, ...)
  41 {
  42         struct ioctl_msg m;
  43         char *argp;
va_list args;
size_t size;
  46         int retval = 0;
va_start(args, cmd);
argp = va_arg(args, char *);
va_end(args);
  52         /*
  53          * Check the parameter size
  54          */
size = IOCPARM_LEN(cmd);
  56         if (size > IOCPARM_MAX) {
errno = EINVAL;
  58                 return -1;
  59         }
  61         /*
  62          * Check fault
  63          */
  64         if ((cmd & IOC_IN && (cmd & IOC_IVAL) == 0 && argp == NULL) ||
  65             (cmd & IOC_OUT && (cmd & IOC_OVAL) == 0 && argp == NULL)) {
errno = EFAULT;
  67                 return -1;
  68         }
  70         /*
  71          * Copy in
  72          */
  73         if (cmd & IOC_IN) {
  74                 if (cmd & IOC_IVAL)
  75                         *((int *)m.buf) = (int)argp;
  76                 else
memcpy(&m.buf, argp, size);
  78         }
m.hdr.code = FS_IOCTL;
m.fd = fd;
m.request = cmd;
  83         if (__posix_call(__fs_obj, &m, sizeof(m), 0) != 0)
  84                 return -1;
  86         /*
  87          * Copy out
  88          */
  89         if (cmd & IOC_OUT) {
  90                 if (cmd & IOC_OVAL)
retval = *((int *)m.buf);
  92                 else
memcpy(argp, &m.buf, size);
  94         }
  96         return retval;
  97 }