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