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Annotation of prex-old/usr/lib/posix/file/ioctl.c, Revision 1.1.1.1

1.1       nbrk        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:  */
                     29:
                     30: #include <prex/prex.h>
                     31: #include <prex/posix.h>
                     32: #include <server/fs.h>
                     33: #include <sys/ioctl.h>
                     34:
                     35: #include <errno.h>
                     36: #include <stdarg.h>
                     37: #include <string.h>
                     38:
                     39: int
                     40: ioctl(int fd, unsigned long request, ...)
                     41: {
                     42:        struct ioctl_msg m;
                     43:        char *argp;
                     44:        va_list args;
                     45:        size_t size;
                     46:        struct stat st;
                     47:        int err;
                     48:
                     49:        va_start(args, request);
                     50:        argp = va_arg(args, char *);
                     51:        va_end(args);
                     52:
                     53:        size = IOCPARM_LEN(request);
                     54:        if (size > IOCPARM_MAX) {
                     55:                errno = ENOTTY;
                     56:                return -1;
                     57:        }
                     58:
                     59:        if (fstat(fd, &st) == -1)
                     60:                return -1;
                     61:        if (S_ISCHR(st.st_mode) || S_ISBLK(st.st_mode)) {
                     62:                /*
                     63:                 * Note: The file system server can not handle the
                     64:                 * poniter type arguent for ioctl(). So, we have to
                     65:                 * invoke the ioctl here if the target file is a device.
                     66:                 */
                     67:                err = device_ioctl(st.st_rdev, request, (u_long)argp);
                     68:                if (err != 0) {
                     69:                        errno = err;
                     70:                        return -1;
                     71:                }
                     72:                return 0;
                     73:        }
                     74:        /*
                     75:         * Note:
                     76:         *  We can not know if the argument is pointer or int value.
                     77:         *  So, if it is an input request and its length is sizeof(int),
                     78:         *  we handle it as direct value.
                     79:         */
                     80:        if (((request & IOC_DIRMASK) == IOC_IN) && (size == sizeof(int)))
                     81:                *((int *)m.buf) = (int)argp;
                     82:        else if ((request & IOC_IN) && size && argp)
                     83:                memcpy(&m.buf, argp, size);
                     84:
                     85:        m.hdr.code = FS_IOCTL;
                     86:        m.fd = fd;
                     87:        m.request = request;
                     88:        if (__posix_call(__fs_obj, &m, sizeof(m), 0) != 0)
                     89:                return -1;
                     90:        if ((request & IOC_OUT) && size && argp)
                     91:                memcpy(argp, &m.buf, size);
                     92:        return 0;
                     93: }